From 05e9fab473285310a123a40b00678791c6c0dfea Mon Sep 17 00:00:00 2001
From: Christian Beeznest <christian.fasanando@beeznest.com>
Date: Tue, 28 Jan 2025 01:52:45 -0500
Subject: [PATCH] Attendance: Improve attendance tool with Vue & Symfony
 integration - refs #6048

---
 .../attendance/AttendanceCalendarForm.vue     | 156 ++++
 .../components/attendance/AttendanceForm.vue  | 205 +++++
 .../components/attendance/AttendanceTable.vue | 133 ++++
 .../components/basecomponents/BaseIcon.vue    |   2 +
 .../components/basecomponents/ChamiloIcons.js |  11 +-
 assets/vue/router/attendance.js               |  44 ++
 assets/vue/router/index.js                    |   2 +
 assets/vue/services/attendanceService.js      | 253 +++++++
 assets/vue/services/gradebookService.js       |  24 +
 .../attendance/AttendanceCalendarAdd.vue      |  32 +
 .../attendance/AttendanceCalendarList.vue     | 262 +++++++
 .../vue/views/attendance/AttendanceCreate.vue |  32 +
 .../vue/views/attendance/AttendanceEdit.vue   |  77 ++
 .../vue/views/attendance/AttendanceExport.vue |  11 +
 .../vue/views/attendance/AttendanceList.vue   | 124 +++
 .../views/attendance/AttendanceSheetList.vue  | 704 ++++++++++++++++++
 config/services.yaml                          |   9 +
 .../Controller/AttendanceController.php       | 241 ++++++
 .../Controller/GradebookController.php        |  33 +
 src/CoreBundle/Entity/AbstractResource.php    |   5 +-
 .../Schema/V200/Version20250126180000.php     |  30 +
 .../GradeBookCategoryRepository.php           |  65 +-
 .../Repository/Node/UserRepository.php        |  49 ++
 .../State/CAttendanceStateProcessor.php       | 133 ++++
 src/CoreBundle/Tool/Attendance.php            |   2 +-
 src/CourseBundle/Entity/CAttendance.php       | 105 ++-
 .../Entity/CAttendanceCalendar.php            |  23 +-
 .../Entity/CAttendanceCalendarRelGroup.php    |   3 +-
 src/CourseBundle/Entity/CAttendanceResult.php |   1 +
 src/CourseBundle/Entity/CAttendanceSheet.php  |  29 +-
 src/CourseBundle/Entity/CGroup.php            |  40 +-
 .../CAttendanceCalendarRelGroupRepository.php |  42 ++
 .../CAttendanceCalendarRepository.php         | 184 +++++
 .../Repository/CAttendanceSheetRepository.php |  38 +
 34 files changed, 3068 insertions(+), 36 deletions(-)
 create mode 100644 assets/vue/components/attendance/AttendanceCalendarForm.vue
 create mode 100644 assets/vue/components/attendance/AttendanceForm.vue
 create mode 100644 assets/vue/components/attendance/AttendanceTable.vue
 create mode 100644 assets/vue/router/attendance.js
 create mode 100644 assets/vue/services/attendanceService.js
 create mode 100644 assets/vue/services/gradebookService.js
 create mode 100644 assets/vue/views/attendance/AttendanceCalendarAdd.vue
 create mode 100644 assets/vue/views/attendance/AttendanceCalendarList.vue
 create mode 100644 assets/vue/views/attendance/AttendanceCreate.vue
 create mode 100644 assets/vue/views/attendance/AttendanceEdit.vue
 create mode 100644 assets/vue/views/attendance/AttendanceExport.vue
 create mode 100644 assets/vue/views/attendance/AttendanceList.vue
 create mode 100644 assets/vue/views/attendance/AttendanceSheetList.vue
 create mode 100644 src/CoreBundle/Controller/AttendanceController.php
 create mode 100644 src/CoreBundle/Migrations/Schema/V200/Version20250126180000.php
 create mode 100644 src/CoreBundle/State/CAttendanceStateProcessor.php
 create mode 100644 src/CourseBundle/Repository/CAttendanceCalendarRelGroupRepository.php
 create mode 100644 src/CourseBundle/Repository/CAttendanceCalendarRepository.php
 create mode 100644 src/CourseBundle/Repository/CAttendanceSheetRepository.php

diff --git a/assets/vue/components/attendance/AttendanceCalendarForm.vue b/assets/vue/components/attendance/AttendanceCalendarForm.vue
new file mode 100644
index 0000000000..e6e0297c4b
--- /dev/null
+++ b/assets/vue/components/attendance/AttendanceCalendarForm.vue
@@ -0,0 +1,156 @@
+<template>
+  <form class="flex flex-col gap-6 mt-6">
+    <!-- Start Date -->
+    <BaseCalendar
+      v-model="formData.startDate"
+      :label="t('Start Date')"
+      :show-time="true"
+      required
+    />
+
+    <!-- Repeat Date -->
+    <BaseCheckbox
+      v-model="formData.repeatDate"
+      :label="t('Repeat Date')"
+      @change="toggleRepeatOptions"
+    />
+
+    <div v-if="formData.repeatDate">
+      <!-- Repeat Type -->
+      <BaseSelect
+        v-model="formData.repeatType"
+        :label="t('Repeat Type')"
+        :options="repeatTypeOptions"
+        option-label="label"
+        option-value="value"
+        required
+      />
+
+      <!-- Number of Days for Every X Days -->
+      <div v-if="formData.repeatType === 'every-x-days'">
+        <BaseInputNumber
+          v-model="formData.repeatDays"
+          :label="t('Number of days')"
+          type="number"
+          min="1"
+          required
+        />
+      </div>
+
+      <!-- Repeat End Date -->
+      <BaseCalendar
+        v-model="formData.repeatEndDate"
+        :label="t('Repeat End Date')"
+        :show-time="true"
+        required
+      />
+    </div>
+
+    <!-- Group -->
+    <BaseSelect
+      v-model="formData.group"
+      :label="t('Group')"
+      :options="groupOptions"
+      option-label="label"
+      option-value="value"
+      required
+    />
+
+    <!-- Buttons -->
+    <LayoutFormButtons>
+      <BaseButton
+        :label="t('Back')"
+        icon="arrow-left"
+        type="black"
+        @click="$emit('back-pressed')"
+      />
+      <BaseButton
+        :label="t('Save')"
+        icon="check"
+        type="success"
+        @click="submitForm"
+      />
+    </LayoutFormButtons>
+  </form>
+</template>
+<script setup>
+import { onMounted, reactive, ref } from "vue"
+import { useI18n } from "vue-i18n"
+import attendanceService from "../../services/attendanceService"
+import BaseCalendar from "../../components/basecomponents/BaseCalendar.vue"
+import BaseCheckbox from "../../components/basecomponents/BaseCheckbox.vue"
+import BaseSelect from "../../components/basecomponents/BaseSelect.vue"
+import LayoutFormButtons from "../../components/layout/LayoutFormButtons.vue"
+import BaseButton from "../../components/basecomponents/BaseButton.vue"
+import { useRoute } from "vue-router"
+import BaseInputNumber from "../basecomponents/BaseInputNumber.vue"
+
+const { t } = useI18n()
+const emit = defineEmits(["back-pressed"])
+const route = useRoute()
+const parentResourceNodeId = ref(Number(route.params.node))
+
+const formData = reactive({
+  startDate: "",
+  repeatDate: false,
+  repeatType: "",
+  repeatEndDate: "",
+  repeatDays: 0,
+  group: "",
+})
+
+const repeatTypeOptions = [
+  { label: t("Daily"), value: "daily" },
+  { label: t("Weekly"), value: "weekly" },
+  { label: t("Bi-Weekly"), value: "bi-weekly" },
+  { label: t("Every X Days"), value: "every-x-days" },
+  { label: t("Monthly by Date"), value: "monthly-by-date" },
+]
+
+const groupOptions = ref([])
+
+const toggleRepeatOptions = () => {
+  if (!formData.repeatDate) {
+    formData.repeatType = ""
+    formData.repeatEndDate = ""
+    formData.repeatDays = 0
+  }
+}
+
+const submitForm = async () => {
+  if (!formData.startDate) {
+    return
+  }
+
+  if (formData.repeatDate && (!formData.repeatType || !formData.repeatEndDate)) {
+    return
+  }
+
+  const payload = {
+    startDate: formData.startDate,
+    repeatDate: formData.repeatDate,
+    repeatType: formData.repeatType,
+    repeatEndDate: formData.repeatEndDate,
+    repeatDays: formData.repeatType === "every-x-days" ? formData.repeatDays : null,
+    group: formData.group ? parseInt(formData.group) : null,
+  }
+
+  try {
+    await attendanceService.addAttendanceCalendar(route.params.id, payload)
+    emit("back-pressed")
+  } catch (error) {
+    console.error("Error adding attendance calendar entry:", error)
+  }
+}
+
+
+const loadGroups = async () => {
+  try {
+    groupOptions.value = await attendanceService.fetchGroups(parentResourceNodeId.value)
+  } catch (error) {
+    console.error("Error loading groups:", error)
+  }
+}
+
+onMounted(loadGroups)
+</script>
diff --git a/assets/vue/components/attendance/AttendanceForm.vue b/assets/vue/components/attendance/AttendanceForm.vue
new file mode 100644
index 0000000000..3dc7a71e9d
--- /dev/null
+++ b/assets/vue/components/attendance/AttendanceForm.vue
@@ -0,0 +1,205 @@
+<template>
+  <form
+    @submit.prevent="submitForm"
+    class="flex flex-col gap-6 mt-6"
+  >
+    <!-- Title -->
+    <BaseInputTextWithVuelidate
+      v-model="formData.title"
+      :label="t('Title')"
+      :vuelidate-property="v$.title"
+      required
+    />
+
+    <!-- Description -->
+    <BaseTinyEditor
+      v-model="formData.description"
+      :title="t('Description')"
+      editor-id="attendance_description"
+    />
+
+    <!-- Advanced Settings (only in creation mode) -->
+    <BaseAdvancedSettingsButton
+      v-if="!isEditMode"
+      v-model="showAdvancedSettings"
+    >
+      <div class="flex flex-row mb-4">
+        <label class="font-semibold w-28">{{ t("Gradebook Options") }}:</label>
+        <BaseCheckbox
+          id="attendance_qualify_gradebook"
+          v-model="formData.qualifyGradebook"
+          :label="t('Qualify Attendance Gradebook')"
+          name="attendance_qualify_gradebook"
+          @change="toggleGradebookOptions"
+        />
+      </div>
+
+      <div
+        v-if="formData.qualifyGradebook"
+        class="ml-6"
+      >
+        <BaseSelect
+          v-model="formData.gradebookOption"
+          :label="t('Select Gradebook Option')"
+          :options="gradebookOptions"
+          option-label="label"
+          option-value="value"
+        />
+
+        <BaseInputText
+          v-model="formData.gradebookTitle"
+          :label="t('Gradebook Column Title')"
+        />
+
+        <BaseInputNumber
+          v-model="formData.gradeWeight"
+          :label="t('Grade Weight')"
+          :min="0"
+          :step="0.01"
+        />
+      </div>
+    </BaseAdvancedSettingsButton>
+
+    <!-- Buttons -->
+    <LayoutFormButtons>
+      <BaseButton
+        :label="t('Back')"
+        icon="back"
+        type="black"
+        @click="emit('backPressed', route.query)"
+      />
+      <BaseButton
+        :label="t('Save Attendance')"
+        icon="save"
+        type="success"
+        @click="submitForm"
+      />
+    </LayoutFormButtons>
+  </form>
+</template>
+<script setup>
+import { computed, onMounted, ref, reactive, watch } from "vue"
+import { useI18n } from "vue-i18n"
+import { required } from "@vuelidate/validators"
+import useVuelidate from "@vuelidate/core"
+import attendanceService from "../../services/attendanceService"
+import BaseInputTextWithVuelidate from "../../components/basecomponents/BaseInputTextWithVuelidate.vue"
+import BaseTinyEditor from "../../components/basecomponents/BaseTinyEditor.vue"
+import BaseCheckbox from "../../components/basecomponents/BaseCheckbox.vue"
+import BaseSelect from "../../components/basecomponents/BaseSelect.vue"
+import BaseInputNumber from "../../components/basecomponents/BaseInputNumber.vue"
+import LayoutFormButtons from "../../components/layout/LayoutFormButtons.vue"
+import BaseButton from "../../components/basecomponents/BaseButton.vue"
+import BaseAdvancedSettingsButton from "../../components/basecomponents/BaseAdvancedSettingsButton.vue"
+import BaseInputText from "../basecomponents/BaseInputText.vue"
+import { useRoute } from "vue-router"
+import { RESOURCE_LINK_PUBLISHED } from "../../constants/entity/resourcelink"
+import { useCidReq } from "../../composables/cidReq"
+import gradebookService from "../../services/gradebookService"
+
+const { t } = useI18n()
+const route = useRoute()
+const { sid, cid } = useCidReq()
+const emit = defineEmits(["backPressed"])
+const props = defineProps({
+  initialData: {
+    type: Object,
+    default: () => ({}),
+  },
+})
+
+const parentResourceNodeId = ref(Number(route.params.node))
+const resourceLinkList = ref([
+  {
+    sid,
+    cid,
+    visibility: RESOURCE_LINK_PUBLISHED,
+  },
+])
+
+const formData = reactive({
+  id: null,
+  title: "",
+  description: "",
+  qualifyGradebook: false,
+  gradebookOption: null,
+  gradebookTitle: "",
+  gradeWeight: 0.0,
+})
+
+const gradebookOptions = ref([])
+
+const rules = {
+  title: { required },
+  description: {},
+  qualifyGradebook: {},
+  gradebookOption: {},
+  gradebookTitle: {},
+  gradeWeight: {},
+}
+
+const v$ = useVuelidate(rules, formData)
+
+const showAdvancedSettings = ref(false)
+
+const isEditMode = computed(() => !!props.initialData?.id)
+
+onMounted(async () => {
+  if (!isEditMode.value) {
+    try {
+      const categories = await gradebookService.getCategories(cid, sid)
+      gradebookOptions.value = categories.map((cat) => ({
+        label: cat.title,
+        value: cat.id,
+      }))
+    } catch (error) {
+      console.error("Error loading gradebook categories:", error)
+    }
+  }
+})
+
+const toggleGradebookOptions = () => {
+  if (!formData.qualifyGradebook) {
+    formData.gradebookOption = null
+    formData.gradebookTitle = ""
+    formData.gradeWeight = 0.0
+  }
+}
+
+watch(
+  () => props.initialData,
+  (newData) => {
+    Object.assign(formData, newData || {})
+  },
+  { immediate: true },
+)
+
+const submitForm = async () => {
+  v$.value.$touch()
+  if (v$.value.$invalid) {
+    return
+  }
+
+  const postData = {
+    title: formData.title,
+    description: formData.description,
+    parentResourceNodeId: parentResourceNodeId.value,
+    resourceLinkList: resourceLinkList.value,
+    sid: route.query.sid || null,
+    cid: route.query.cid || null,
+    attendanceQualifyTitle: formData.gradebookTitle,
+    attendanceWeight: formData.gradeWeight,
+  }
+
+  try {
+    if (props.initialData?.id) {
+      await attendanceService.updateAttendance(props.initialData.id, postData)
+    } else {
+      await attendanceService.createAttendance(postData)
+    }
+    emit("backPressed", route.query)
+  } catch (error) {
+    console.error("Error submitting attendance:", error)
+  }
+}
+</script>
diff --git a/assets/vue/components/attendance/AttendanceTable.vue b/assets/vue/components/attendance/AttendanceTable.vue
new file mode 100644
index 0000000000..f73593e5ee
--- /dev/null
+++ b/assets/vue/components/attendance/AttendanceTable.vue
@@ -0,0 +1,133 @@
+<template>
+  <DataTable
+    :value="attendances"
+    :paginator="true"
+    :rows="10"
+    :rows-per-page-options="[5, 10, 20, 50]"
+    :total-records="totalRecords"
+    class="p-datatable-sm"
+    :loading="loading"
+    data-key="id"
+    current-page-report-template="Showing {first} to {last} of {totalRecords}"
+    responsive-layout="scroll"
+    @page="onPageChange"
+  >
+    <!-- Column for Name -->
+    <Column
+      field="title"
+      header="Name"
+      sortable
+    >
+      <template #body="slotProps">
+        <RouterLink
+          :to="{
+            name: 'AttendanceSheetList',
+            params: {
+              node: route.params.node,
+              id: slotProps.data.id,
+            },
+            query: {
+              cid: route.query.cid,
+              sid: route.query.sid,
+              gid: route.query.gid,
+            },
+          }"
+          class="text-blue-500 underline"
+        >
+          {{ slotProps.data.title }}
+        </RouterLink>
+      </template>
+    </Column>
+
+    <!-- Column for Description -->
+    <Column
+      field="description"
+      header="Description"
+      sortable
+    >
+      <template #body="slotProps">
+        <div v-html="slotProps.data.description"></div>
+      </template>
+    </Column>
+
+    <!-- Column for # attended -->
+    <Column
+      field="results.length"
+      header="# attended"
+      sortable
+    >
+      <template #body="slotProps">
+        <center>{{ slotProps.data.results ? slotProps.data.results.length : 0 }}</center>
+      </template>
+    </Column>
+
+    <!-- Column for Detail -->
+    <Column header="Detail">
+      <template #body="slotProps">
+        <div class="flex gap-2 justify-center">
+          <Button
+            icon="pi pi-pencil"
+            class="p-button-rounded p-button-sm p-button-info"
+            @click="onEdit(slotProps.data)"
+            tooltip="Edit"
+          />
+          <Button
+            :icon="getVisibilityIcon(slotProps.data)"
+            class="p-button-rounded p-button-sm"
+            :class="getVisibilityClass(slotProps.data)"
+            @click="onView(slotProps.data)"
+            :tooltip="getVisibilityTooltip(slotProps.data)"
+          />
+          <Button
+            icon="pi pi-trash"
+            class="p-button-rounded p-button-sm p-button-danger"
+            @click="onDelete(slotProps.data)"
+            tooltip="Delete"
+          />
+        </div>
+      </template>
+    </Column>
+  </DataTable>
+</template>
+<script setup>
+import { useRoute } from "vue-router"
+
+const route = useRoute()
+
+const props = defineProps({
+  attendances: {
+    type: Array,
+    required: true,
+  },
+  loading: {
+    type: Boolean,
+    default: false,
+  },
+  totalRecords: {
+    type: Number,
+    default: 0,
+  },
+})
+
+const emit = defineEmits(["edit", "view", "delete", "pageChange"])
+
+const onEdit = (attendance) => emit("edit", attendance)
+const onView = (attendance) => emit("view", attendance)
+const onDelete = (attendance) => emit("delete", attendance)
+const onPageChange = (event) => emit("pageChange", event)
+
+const getVisibilityIcon = (attendance) => {
+  const visibility = attendance.resourceLinkListFromEntity?.[0]?.visibility || 0
+  return visibility === 2 ? "pi pi-eye" : "pi pi-eye-slash"
+}
+
+const getVisibilityClass = (attendance) => {
+  const visibility = attendance.resourceLinkListFromEntity?.[0]?.visibility || 0
+  return visibility === 2 ? "p-button-success" : "p-button-warning"
+}
+
+const getVisibilityTooltip = (attendance) => {
+  const visibility = attendance.resourceLinkListFromEntity?.[0]?.visibility || 0
+  return visibility === 2 ? "Visible" : "Hidden"
+}
+</script>
diff --git a/assets/vue/components/basecomponents/BaseIcon.vue b/assets/vue/components/basecomponents/BaseIcon.vue
index 540c3ce23e..5a13b80ee0 100644
--- a/assets/vue/components/basecomponents/BaseIcon.vue
+++ b/assets/vue/components/basecomponents/BaseIcon.vue
@@ -2,6 +2,8 @@
   <i
     :class="iconClass"
     aria-hidden="true"
+    @click="$emit('click', $event)"
+    class="cursor-pointer"
   />
 </template>
 
diff --git a/assets/vue/components/basecomponents/ChamiloIcons.js b/assets/vue/components/basecomponents/ChamiloIcons.js
index 718ee1dbaf..fbb7c5e937 100644
--- a/assets/vue/components/basecomponents/ChamiloIcons.js
+++ b/assets/vue/components/basecomponents/ChamiloIcons.js
@@ -41,7 +41,8 @@ export const chamiloIconToClass = {
   "dots-vertical": "mdi mdi-dots-vertical",
   "down": "mdi mdi-arrow-down-right",
   "download": "mdi mdi-download-box",
-  "drawing": "mdi mdi-drawing",
+  "comment": "mdi mdi-comment-text-outline",
+  "drawing": "mdi mdi-pencil-outline",
   "edit": "mdi mdi-pencil",
   "email-plus": "mdi mdi-email-plus-outline",
   "email-unread": "mdi mdi-email-mark-as-unread",
@@ -127,5 +128,11 @@ export const chamiloIconToClass = {
   "next": "mdi mdi-arrow-right-bold-box",
   "crosshairs": "mdi mdi-crosshairs",
   "square": "mdi mdi-square",
-  "wheel": "mdi mdi-tire"
+  "wheel": "mdi mdi-tire",
+  "view-table": "mdi mdi-table-eye",
+  "eye-lock": "mdi mdi-lock",
+  "unlock": "mdi mdi-lock-open",
+  "lock": "mdi mdi-lock",
+  "account-check": "mdi mdi-account-check",
+  "account-cancel": "mdi mdi-account-cancel",
 }
diff --git a/assets/vue/router/attendance.js b/assets/vue/router/attendance.js
new file mode 100644
index 0000000000..2ea28edfdc
--- /dev/null
+++ b/assets/vue/router/attendance.js
@@ -0,0 +1,44 @@
+export default {
+  path: "/resources/attendance/:node/",
+  meta: { requiresAuth: true, showBreadcrumb: true },
+  name: "attendance",
+  component: () => import("../components/layout/SimpleRouterViewLayout.vue"),
+  redirect: { name: "AttendanceList" },
+  children: [
+    {
+      name: "AttendanceList",
+      path: "",
+      component: () => import("../views/attendance/AttendanceList.vue"),
+    },
+    {
+      name: "CreateAttendance",
+      path: "create",
+      component: () => import("../views/attendance/AttendanceCreate.vue"),
+    },
+    {
+      name: "EditAttendance",
+      path: "edit/:id",
+      component: () => import("../views/attendance/AttendanceEdit.vue"),
+    },
+    {
+      name: "AttendanceSheetList",
+      path: ":id?/sheet-list",
+      component: () => import("../views/attendance/AttendanceSheetList.vue"),
+    },
+    {
+      name: "CalendarList",
+      path: ":id?/calendar",
+      component: () => import("../views/attendance/AttendanceCalendarList.vue"),
+    },
+    {
+      name: "AddCalendarEvent",
+      path: ":id?/calendar/create",
+      component: () => import("../views/attendance/AttendanceCalendarAdd.vue"),
+    },
+    {
+      name: "ExportToPdf",
+      path: ":id?/export/pdf",
+      component: () => import("../views/attendance/AttendanceExport.vue"),
+    },
+  ],
+}
diff --git a/assets/vue/router/index.js b/assets/vue/router/index.js
index e772920745..4d0504368d 100644
--- a/assets/vue/router/index.js
+++ b/assets/vue/router/index.js
@@ -21,6 +21,7 @@ import documents from "./documents"
 import assignments from "./assignments"
 import links from "./links"
 import glossary from "./glossary"
+import attendance from "./attendance"
 import catalogue from "./catalogue"
 import { useSecurityStore } from "../store/securityStore"
 import MyCourseList from "../views/user/courses/List.vue"
@@ -234,6 +235,7 @@ const router = createRouter({
     assignments,
     links,
     glossary,
+    attendance,
     accountRoutes,
     personalFileRoutes,
     messageRoutes,
diff --git a/assets/vue/services/attendanceService.js b/assets/vue/services/attendanceService.js
new file mode 100644
index 0000000000..71ea68b7d6
--- /dev/null
+++ b/assets/vue/services/attendanceService.js
@@ -0,0 +1,253 @@
+import { ENTRYPOINT } from "../config/entrypoint"
+import axios from "axios"
+
+export const ATTENDANCE_STATES = {
+  ABSENT: { id: 0, label: "Absent", score: 0 },
+  PRESENT: { id: 1, label: "Present", score: 1 },
+  LATE_15: { id: 2, label: "Late < 15 min", score: 1 },
+  LATE_15_PLUS: { id: 3, label: "Late > 15 min", score: 0.5 },
+  ABSENT_JUSTIFIED: { id: 4, label: "Absent, justified", score: 0.25 },
+}
+
+export default {
+  /**
+   * Fetches all attendance lists for a specific course.
+   * @param {Object} params - Filters for the attendance lists.
+   * @returns {Promise<Object>} - Data of the attendance lists.
+   */
+  getAttendances: async (params) => {
+    const response = await axios.get(`${ENTRYPOINT}attendances/`, { params })
+    return response.data
+  },
+
+  /**
+   * Fetches a specific attendance list by its ID.
+   * @param {Number|String} attendanceId - ID of the attendance list.
+   * @returns {Promise<Object>} - Data of the specific attendance list.
+   */
+  getAttendance: async (attendanceId) => {
+    const response = await axios.get(`${ENTRYPOINT}attendances/${attendanceId}/`)
+    return response.data
+  },
+
+  /**
+   * Fetches groups filtered by the parent node (course).
+   * @param {Number|String} parentNodeId - The ID of the parent resource node (course).
+   * @returns {Promise<Array>} - List of groups associated with the course.
+   */
+  fetchGroups: async (parentNodeId) => {
+    try {
+      const response = await axios.get(`${ENTRYPOINT}groups`, {
+        params: { "resourceNode.parent": parentNodeId },
+      })
+      return response.data["hydra:member"].map((group) => ({
+        label: group.title,
+        value: group.iid,
+      }))
+    } catch (error) {
+      console.error("Error fetching groups:", error)
+      throw error
+    }
+  },
+
+  /**
+   * Creates a new attendance list.
+   * @param {Object} data - Data for the new attendance list.
+   * @returns {Promise<Object>} - Data of the created attendance list.
+   */
+  createAttendance: async (data) => {
+    const response = await axios.post(`${ENTRYPOINT}attendances`, data)
+    return response.data
+  },
+
+  /**
+   * Updates an existing attendance list.
+   * @param {Number|String} attendanceId - ID of the attendance list.
+   * @param {Object} data - Updated data for the attendance list.
+   * @returns {Promise<Object>} - Data of the updated attendance list.
+   */
+  updateAttendance: async (attendanceId, data) => {
+    const response = await axios.put(`${ENTRYPOINT}attendances/${attendanceId}`, data)
+    return response.data
+  },
+
+  /**
+   * Deletes an attendance list.
+   * @param {Number|String} attendanceId - ID of the attendance list.
+   * @returns {Promise<Object>} - Result of the deletion.
+   */
+  deleteAttendance: async (attendanceId) => {
+    const response = await axios.delete(`${ENTRYPOINT}attendances/${attendanceId}`)
+    return response.data
+  },
+
+  /**
+   * Toggles the visibility of an attendance list.
+   * @param {Number|String} attendanceId - ID of the attendance list.
+   * @returns {Promise<void>} - Result of the toggle action.
+   */
+  toggleVisibility: async (attendanceId) => {
+    const endpoint = `${ENTRYPOINT}attendances/${attendanceId}/toggle_visibility`
+    await axios.put(endpoint, {}, { headers: { "Content-Type": "application/json" } })
+  },
+
+  /**
+   * Soft deletes an attendance list.
+   * @param {Number|String} attendanceId - ID of the attendance list.
+   * @returns {Promise<void>} - Result of the soft delete action.
+   */
+  softDelete: async (attendanceId) => {
+    const endpoint = `${ENTRYPOINT}attendances/${attendanceId}/soft_delete`
+    await axios.put(endpoint, {}, { headers: { "Content-Type": "application/json" } })
+  },
+
+  /**
+   * Adds a new calendar event to an attendance list.
+   * @param {Number|String} attendanceId - ID of the attendance list.
+   * @param {Object} data - Data for the new calendar event.
+   * @returns {Promise<Object>} - Data of the created calendar event.
+   */
+  addCalendarEvent: async (attendanceId, data) => {
+    const response = await axios.post(`${ENTRYPOINT}attendances/${attendanceId}/calendars`, data)
+    return response.data
+  },
+
+  /**
+   * Updates an existing calendar event.
+   * @param {Number|String} calendarId - ID of the calendar event.
+   * @param {Object} data - Updated data for the calendar event.
+   * @returns {Promise<Object>} - Data of the updated calendar event.
+   */
+  updateCalendarEvent: async (calendarId, data) => {
+    const response = await axios.put(`${ENTRYPOINT}c_attendance_calendars/${calendarId}`, data)
+    return response.data
+  },
+
+  /**
+   * Deletes a specific calendar event.
+   * @param {Number|String} calendarId - ID of the calendar event.
+   * @returns {Promise<Object>} - Result of the deletion.
+   */
+  deleteCalendarEvent: async (calendarId) => {
+    const response = await axios.delete(`${ENTRYPOINT}c_attendance_calendars/${calendarId}`)
+    return response.data
+  },
+
+  /**
+   * Adds a new calendar entry directly to an attendance list.
+   * @param {Number|String} attendanceId - ID of the attendance list.
+   * @param {Object} data - Calendar data, including repetition and groups.
+   * @returns {Promise<Object>} - Data of the created calendar entry.
+   */
+  addAttendanceCalendar: async (attendanceId, data) => {
+    const endpoint = `${ENTRYPOINT}attendances/${attendanceId}/calendars`
+    const response = await axios.post(endpoint, data, {
+      headers: { "Content-Type": "application/json" },
+    })
+    return response.data
+  },
+
+  /**
+   * Fetches full attendance data (dates and attendance status).
+   * @param {Number|String} attendanceId - ID of the attendance list.
+   * @returns {Promise<Object>} - Full attendance data structured for Vue.
+   */
+  getFullAttendanceData: async (attendanceId) => {
+    try {
+      const response = await axios.get(`/attendance/full-data`, {
+        params: { attendanceId },
+      })
+      return response.data
+    } catch (error) {
+      console.error("Error fetching full attendance data:", error)
+      throw error
+    }
+  },
+
+  /**
+   * Fetches users related to attendance based on course, session, or group.
+   * @param {Object} params - Object with courseId, sessionId, and/or groupId.
+   * @returns {Promise<Array>} - List of users.
+   */
+  getAttendanceSheetUsers: async (params) => {
+    try {
+      const response = await axios.get(`/attendance/users/context`, { params })
+      return response.data
+    } catch (error) {
+      console.error("Error fetching attendance sheet users:", error)
+      throw error
+    }
+  },
+
+  /**
+   * Updates an existing calendar entry for an attendance list.
+   * @param {Number|String} attendanceId - ID of the attendance list.
+   * @param {Number|String} calendarId - ID of the calendar entry to update.
+   * @param {Object} data - Updated calendar data.
+   * @returns {Promise<Object>} - Data of the updated calendar entry.
+   */
+  updateAttendanceCalendar: async (attendanceId, calendarId, data) => {
+    const endpoint = `${ENTRYPOINT}attendances/${attendanceId}/calendars/${calendarId}`
+    const response = await axios.put(endpoint, data)
+    return response.data
+  },
+
+  /**
+   * Deletes a specific calendar entry for an attendance list.
+   * @param {Number|String} attendanceId - ID of the attendance list.
+   * @param {Number|String} calendarId - ID of the calendar entry to delete.
+   * @returns {Promise<Object>} - Result of the deletion.
+   */
+  deleteAttendanceCalendar: async (attendanceId, calendarId) => {
+    const endpoint = `${ENTRYPOINT}attendances/${attendanceId}/calendars/${calendarId}`
+    const response = await axios.delete(endpoint)
+    return response.data
+  },
+
+  /**
+   * Deletes all calendar entries for a specific attendance list.
+   * @param {Number|String} attendanceId - ID of the attendance list.
+   * @returns {Promise<Object>} - Result of the deletion.
+   */
+  deleteAllAttendanceCalendars: async (attendanceId) => {
+    const endpoint = `${ENTRYPOINT}attendances/${attendanceId}/calendars`
+    const response = await axios.delete(endpoint)
+    return response.data
+  },
+
+  /**
+   * Exports an attendance list to PDF format.
+   * @param {Number|String} attendanceId - ID of the attendance list.
+   * @returns {Promise<Blob>} - PDF file of the attendance list.
+   */
+  exportAttendanceToPdf: async (attendanceId) => {
+    const response = await axios.get(`${ENTRYPOINT}attendances/${attendanceId}/export/pdf`, {
+      responseType: "blob",
+    })
+    return response.data
+  },
+
+  /**
+   * Exports an attendance list to XLS format.
+   * @param {Number|String} attendanceId - ID of the attendance list.
+   * @returns {Promise<Blob>} - XLS file of the attendance list.
+   */
+  exportAttendanceToXls: async (attendanceId) => {
+    const response = await axios.get(`${ENTRYPOINT}attendances/${attendanceId}/export/xls`, {
+      responseType: "blob",
+    })
+    return response.data
+  },
+
+  saveAttendanceSheet: async (data) => {
+    try {
+      const response = await axios.post(`/attendance/sheet/save`, data, {
+        headers: { "Content-Type": "application/json" },
+      })
+      return response.data
+    } catch (error) {
+      console.error("Error saving attendance sheet:", error)
+      throw error
+    }
+  },
+}
diff --git a/assets/vue/services/gradebookService.js b/assets/vue/services/gradebookService.js
new file mode 100644
index 0000000000..5882bb8c3d
--- /dev/null
+++ b/assets/vue/services/gradebookService.js
@@ -0,0 +1,24 @@
+import axios from "axios"
+
+const API_BASE = "/gradebook"
+
+export default {
+  /**
+   * Fetches gradebook categories for a specific course and session.
+   * @param {number} courseId The course ID.
+   * @param {number|null} sessionId The session ID (optional).
+   * @returns {Promise<Array>} The list of gradebook categories.
+   */
+  async getCategories(courseId, sessionId = null) {
+    const params = { courseId }
+    if (sessionId) params.sessionId = sessionId
+
+    try {
+      const response = await axios.get(`${API_BASE}/categories`, { params })
+      return response.data
+    } catch (error) {
+      console.error("Error fetching gradebook categories:", error)
+      throw error
+    }
+  },
+}
diff --git a/assets/vue/views/attendance/AttendanceCalendarAdd.vue b/assets/vue/views/attendance/AttendanceCalendarAdd.vue
new file mode 100644
index 0000000000..089b716f06
--- /dev/null
+++ b/assets/vue/views/attendance/AttendanceCalendarAdd.vue
@@ -0,0 +1,32 @@
+<template>
+  <LayoutFormGeneric>
+    <template #header>
+      <BaseIcon icon="calendar-plus" />
+      {{ t("Add Attendance Calendar") }}
+    </template>
+
+    <AttendanceCalendarForm @back-pressed="goBack" />
+  </LayoutFormGeneric>
+</template>
+
+<script setup>
+import { useRouter, useRoute } from "vue-router"
+import { useI18n } from "vue-i18n"
+import LayoutFormGeneric from "../../components/layout/LayoutFormGeneric.vue"
+import BaseIcon from "../../components/basecomponents/BaseIcon.vue"
+import AttendanceCalendarForm from "../../components/attendance/AttendanceCalendarForm.vue"
+
+const { t } = useI18n()
+const router = useRouter()
+const route = useRoute()
+
+const goBack = () => {
+  router.push({
+    name: "CalendarList",
+    params: { node: route.params.node, id: route.params.id },
+    query: {
+      ...route.query,
+    },
+  })
+}
+</script>
diff --git a/assets/vue/views/attendance/AttendanceCalendarList.vue b/assets/vue/views/attendance/AttendanceCalendarList.vue
new file mode 100644
index 0000000000..284b11e572
--- /dev/null
+++ b/assets/vue/views/attendance/AttendanceCalendarList.vue
@@ -0,0 +1,262 @@
+<template>
+  <div class="p-4">
+    <!-- Toolbar -->
+    <BaseToolbar>
+      <BaseButton
+        :label="t('Back to Attendance Sheet')"
+        icon="back"
+        type="info"
+        @click="redirectToAttendanceSheet"
+      />
+      <BaseButton
+        :label="t('Add Calendar Event')"
+        icon="plus"
+        type="success"
+        @click="redirectToAddCalendarEvent"
+      />
+
+      <BaseButton
+        :label="t('Clear All')"
+        icon="delete"
+        type="error"
+        @click="clearAllEvents"
+      />
+    </BaseToolbar>
+
+    <!-- Informative Message -->
+    <div class="p-4 mb-4 text-primary bg-gray-15 border border-gray-25 rounded">
+      <p>
+        {{
+          t(
+            "The attendance calendar allows you to register attendance lists (one per real session the students need to attend). Add new attendance lists here.",
+          )
+        }}
+      </p>
+    </div>
+
+    <!-- Calendar Events List -->
+    <div class="calendar-list flex flex-col gap-4">
+      <div
+        v-for="event in calendarEvents"
+        :key="event.id"
+        class="calendar-item flex justify-between items-center border border-gray-25 rounded bg-gray-10 p-4"
+      >
+        <div class="flex items-center gap-2">
+          <i class="pi pi-calendar text-primary text-lg"></i>
+          <span class="text-gray-90">{{ formatDateTime(event.dateTime) }}</span>
+        </div>
+        <div class="calendar-actions flex gap-2">
+          <BaseButton
+            icon="edit"
+            type="warning"
+            @click="openEditDialog(event)"
+          />
+          <BaseButton
+            icon="delete"
+            type="danger"
+            @click="openDeleteDialog(event.id)"
+          />
+        </div>
+      </div>
+    </div>
+
+    <!-- Edit Dialog -->
+    <Dialog
+      v-model:visible="editDialogVisible"
+      :header="t('Edit Calendar Event')"
+      :modal="true"
+      :closable="false"
+    >
+      <div class="p-fluid">
+        <BaseCalendar
+          v-model="selectedEventDate"
+          :label="t('Date')"
+          :show-time="true"
+        />
+      </div>
+      <div class="dialog-actions">
+        <BaseButton
+          :label="t('Save')"
+          icon="check"
+          type="success"
+          @click="updateCalendarEvent"
+        />
+        <BaseButton
+          :label="t('Cancel')"
+          icon="times"
+          type="danger"
+          @click="closeEditDialog"
+        />
+      </div>
+    </Dialog>
+
+    <!-- Delete Dialog -->
+    <Dialog
+      v-model:visible="deleteDialogVisible"
+      :header="t('Delete Calendar Event')"
+      :modal="true"
+      :closable="false"
+    >
+      <p>{{ t("Are you sure you want to delete this event?") }}</p>
+      <div class="dialog-actions">
+        <BaseButton
+          :label="t('Yes')"
+          icon="check"
+          type="danger"
+          @click="deleteCalendarEventConfirmed"
+        />
+        <BaseButton
+          :label="t('No')"
+          icon="times"
+          type="secondary"
+          @click="closeDeleteDialog"
+        />
+      </div>
+    </Dialog>
+  </div>
+</template>
+<script setup>
+import { ref, onMounted } from "vue"
+import { useRouter, useRoute } from "vue-router"
+import { useI18n } from "vue-i18n"
+import attendanceService from "../../services/attendanceService"
+import BaseToolbar from "../../components/basecomponents/BaseToolbar.vue"
+import BaseButton from "../../components/basecomponents/BaseButton.vue"
+import Dialog from "primevue/dialog"
+import BaseCalendar from "../../components/basecomponents/BaseCalendar.vue"
+
+const { t } = useI18n()
+const router = useRouter()
+const route = useRoute()
+const calendarEvents = ref([])
+const isLoading = ref(false)
+const editDialogVisible = ref(false)
+const deleteDialogVisible = ref(false)
+const selectedEvent = ref(null)
+const selectedEventDate = ref("")
+const eventIdToDelete = ref(null)
+
+const formatDateTime = (dateTime) => new Date(dateTime).toLocaleString()
+
+const fetchCalendarEvents = async () => {
+  try {
+    isLoading.value = true
+    const response = await attendanceService.getAttendance(route.params.id)
+    if (response.calendars && Array.isArray(response.calendars)) {
+      calendarEvents.value = response.calendars.map((calendar) => ({
+        id: calendar.iid || calendar["@id"].split("/").pop(),
+        title: calendar.title || "Unnamed Event",
+        dateTime: calendar.dateTime || new Date(),
+      }))
+    } else {
+      calendarEvents.value = []
+    }
+  } catch (error) {
+    console.error("Error fetching calendar events:", error)
+  } finally {
+    isLoading.value = false
+  }
+}
+
+const openEditDialog = (event) => {
+  selectedEvent.value = event
+  selectedEventDate.value = event.dateTime
+  editDialogVisible.value = true
+}
+
+const updateCalendarEvent = async () => {
+  try {
+    await attendanceService.updateCalendarEvent(selectedEvent.value.id, { dateTime: selectedEventDate.value })
+    closeEditDialog()
+    await fetchCalendarEvents()
+  } catch (error) {
+    console.error("Error updating calendar event:", error)
+  }
+}
+
+const closeEditDialog = () => {
+  editDialogVisible.value = false
+  selectedEvent.value = null
+  selectedEventDate.value = ""
+}
+
+const openDeleteDialog = (id) => {
+  eventIdToDelete.value = id
+  deleteDialogVisible.value = true
+}
+
+// Delete Calendar Event
+const deleteCalendarEventConfirmed = async () => {
+  try {
+    await attendanceService.deleteCalendarEvent(eventIdToDelete.value)
+    closeDeleteDialog()
+    await fetchCalendarEvents()
+  } catch (error) {
+    console.error("Error deleting calendar event:", error)
+  }
+}
+
+const clearAllEvents = async () => {
+  try {
+    if (confirm(t("Are you sure you want to delete all calendar events?"))) {
+      for (const event of calendarEvents.value) {
+        await attendanceService.deleteCalendarEvent(event.id)
+      }
+      calendarEvents.value = []
+    }
+  } catch (error) {
+    console.error("Error clearing all events:", error)
+  }
+}
+
+const closeDeleteDialog = () => {
+  deleteDialogVisible.value = false
+  eventIdToDelete.value = null
+}
+
+const redirectToAttendanceSheet = () => {
+  router.push({
+    name: "AttendanceSheetList",
+    params: { id: route.params.id },
+    query: { cid: route.query.cid, sid: route.query.sid, gid: route.query.gid },
+  })
+}
+
+const redirectToAddCalendarEvent = () => {
+  router.push({
+    name: "AddCalendarEvent",
+    params: { id: route.params.id },
+    query: { cid: route.query.cid, sid: route.query.sid, gid: route.query.gid },
+  })
+}
+
+onMounted(fetchCalendarEvents)
+</script>
+<style scoped>
+.calendar-list {
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+}
+
+.calendar-item {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  border: 1px solid #ddd;
+  padding: 0.75rem;
+  border-radius: 8px;
+  background-color: #f9f9f9;
+}
+
+.calendar-actions {
+  display: flex;
+  gap: 0.5rem;
+}
+
+.dialog-actions {
+  display: flex;
+  justify-content: flex-end;
+  gap: 0.5rem;
+}
+</style>
diff --git a/assets/vue/views/attendance/AttendanceCreate.vue b/assets/vue/views/attendance/AttendanceCreate.vue
new file mode 100644
index 0000000000..727379574f
--- /dev/null
+++ b/assets/vue/views/attendance/AttendanceCreate.vue
@@ -0,0 +1,32 @@
+<template>
+  <LayoutFormGeneric>
+    <template #header>
+      <BaseIcon icon="plus" />
+      {{ t("Add Attendance") }}
+    </template>
+
+    <AttendanceForm @back-pressed="goBack" />
+  </LayoutFormGeneric>
+</template>
+
+<script setup>
+import AttendanceForm from "../../components/attendance/AttendanceForm.vue"
+import { useRoute, useRouter } from "vue-router"
+import { useI18n } from "vue-i18n"
+import LayoutFormGeneric from "../../components/layout/LayoutFormGeneric.vue"
+import BaseIcon from "../../components/basecomponents/BaseIcon.vue"
+
+const { t } = useI18n()
+const router = useRouter()
+const route = useRoute()
+
+const goBack = (query = {}) => {
+  router.push({
+    name: "AttendanceList",
+    query: {
+      ...route.query,
+      ...query,
+    },
+  })
+}
+</script>
diff --git a/assets/vue/views/attendance/AttendanceEdit.vue b/assets/vue/views/attendance/AttendanceEdit.vue
new file mode 100644
index 0000000000..06bff2f2a4
--- /dev/null
+++ b/assets/vue/views/attendance/AttendanceEdit.vue
@@ -0,0 +1,77 @@
+<template>
+  <LayoutFormGeneric>
+    <template #header>
+      <BaseIcon icon="edit" />
+      {{ t("Edit Attendance") }}
+    </template>
+    <div v-if="loading"></div>
+    <div v-else-if="attendanceData">
+      <AttendanceForm
+        :initial-data="{ ...attendanceData }"
+        @back-pressed="goBack"
+      />
+    </div>
+    <div v-else>
+      <p>{{ t("No data available.") }}</p>
+    </div>
+  </LayoutFormGeneric>
+</template>
+
+<script setup>
+import { ref, onMounted } from "vue"
+import AttendanceForm from "../../components/attendance/AttendanceForm.vue"
+import attendanceService from "../../services/attendanceService"
+import { useRouter, useRoute } from "vue-router"
+import { useI18n } from "vue-i18n"
+import LayoutFormGeneric from "../../components/layout/LayoutFormGeneric.vue"
+import BaseIcon from "../../components/basecomponents/BaseIcon.vue"
+import DOMPurify from "dompurify"
+
+const { t } = useI18n()
+const router = useRouter()
+const route = useRoute()
+
+const attendanceData = ref(null)
+const loading = ref(true)
+
+const goBack = (query = {}) => {
+  router.push({
+    name: "AttendanceList",
+    query: {
+      ...route.query,
+      ...query,
+    },
+  })
+}
+
+const fetchAttendance = async () => {
+  const attendanceId = route.params.id
+
+  if (!attendanceId) {
+    goBack()
+    return
+  }
+
+  try {
+    loading.value = true
+    const fetchedData = await attendanceService.getAttendance(attendanceId)
+    attendanceData.value = {
+      id: fetchedData.iid,
+      title: fetchedData.title,
+      description: DOMPurify.sanitize(fetchedData.description),
+      qualifyGradebook: !!fetchedData.attendanceQualifyTitle,
+      gradebookOption: fetchedData.gradebookOption || null,
+      gradebookTitle: fetchedData.attendanceQualifyTitle || "",
+      gradeWeight: fetchedData.attendanceWeight || 0.0,
+    }
+
+  } catch (error) {
+    console.error("Error fetching attendance:", error)
+    attendanceData.value = null
+  } finally {
+    loading.value = false
+  }
+}
+
+onMounted(fetchAttendance)
+</script>
diff --git a/assets/vue/views/attendance/AttendanceExport.vue b/assets/vue/views/attendance/AttendanceExport.vue
new file mode 100644
index 0000000000..85af715314
--- /dev/null
+++ b/assets/vue/views/attendance/AttendanceExport.vue
@@ -0,0 +1,11 @@
+<script setup lang="ts">
+
+</script>
+
+<template>
+
+</template>
+
+<style scoped>
+
+</style>
diff --git a/assets/vue/views/attendance/AttendanceList.vue b/assets/vue/views/attendance/AttendanceList.vue
new file mode 100644
index 0000000000..25e14a1fe5
--- /dev/null
+++ b/assets/vue/views/attendance/AttendanceList.vue
@@ -0,0 +1,124 @@
+<template>
+  <div>
+    <BaseToolbar>
+      <BaseButton
+        :label="t('Add Attendance')"
+        icon="plus"
+        type="black"
+        @click="redirectToCreateAttendance"
+      />
+    </BaseToolbar>
+
+    <AttendanceTable
+      :attendances="attendances"
+      :loading="isLoading"
+      :total-records="totalAttendances"
+      @edit="redirectToEditAttendance"
+      @view="toggleResourceLinkVisibility"
+      @delete="confirmDeleteAttendance"
+      @pageChange="fetchAttendances"
+    />
+
+    <BaseDialogDelete
+      v-model:is-visible="isDeleteDialogVisible"
+      :item-to-delete="attendanceToDelete ? attendanceToDelete.title : ''"
+      @confirm-clicked="deleteAttendance"
+      @cancel-clicked="isDeleteDialogVisible = false"
+    />
+  </div>
+</template>
+<script setup>
+import { ref, onMounted } from "vue"
+import { useRoute, useRouter } from "vue-router"
+import attendanceService from "../../services/attendanceService"
+import AttendanceTable from "../../components/attendance/AttendanceTable.vue"
+import BaseToolbar from "../../components/basecomponents/BaseToolbar.vue"
+import BaseButton from "../../components/basecomponents/BaseButton.vue"
+import BaseDialogDelete from "../../components/basecomponents/BaseDialogDelete.vue"
+import { useI18n } from "vue-i18n"
+import { useCidReq } from "../../composables/cidReq"
+
+const { t } = useI18n()
+const router = useRouter()
+const route = useRoute()
+const attendances = ref([])
+const isDeleteDialogVisible = ref(false)
+const attendanceToDelete = ref({ id: null, title: "" })
+const totalAttendances = ref(0)
+const isLoading = ref(false)
+const { sid, cid, gid } = useCidReq()
+const parentResourceNodeId = ref(Number(route.params.node))
+
+const redirectToCreateAttendance = () => {
+  router.push({
+    name: "CreateAttendance",
+    query: { cid, sid, gid },
+  })
+}
+
+const redirectToEditAttendance = (attendance) => {
+  router.push({
+    name: "EditAttendance",
+    params: { id: attendance.id },
+    query: { cid, sid, gid },
+  })
+}
+
+const confirmDeleteAttendance = (attendance) => {
+  attendanceToDelete.value = { id: attendance.id, title: attendance.title }
+  isDeleteDialogVisible.value = true
+}
+
+const deleteAttendance = async () => {
+  try {
+    await attendanceService.softDelete(attendanceToDelete.value.id)
+    await fetchAttendances()
+  } catch (error) {
+    console.error("Error deleting attendance:", error)
+  } finally {
+    isDeleteDialogVisible.value = false
+  }
+}
+
+const toggleResourceLinkVisibility = async (attendance) => {
+  try {
+    await attendanceService.toggleVisibility(attendance.id)
+    await fetchAttendances()
+  } catch (error) {
+    console.error("Error toggling visibility:", error)
+  }
+}
+
+const fetchAttendances = async ({ page = 1, rows = 10 } = {}) => {
+  try {
+    isLoading.value = true
+    const params = {
+      "resourceNode.parent": parentResourceNodeId.value,
+      active: 1,
+      cid,
+      sid,
+      gid,
+      page,
+      rows,
+    }
+    const data = await attendanceService.getAttendances(params)
+
+    attendances.value = data["hydra:member"].map((item) => ({
+      id: item.iid,
+      title: item.title,
+      description: item.description,
+      resourceLinkListFromEntity: item.resourceLinkListFromEntity,
+      attendanceQualifyTitle: item.attendanceQualifyTitle,
+      attendanceWeight: item.attendanceWeight,
+    }))
+
+    totalAttendances.value = data.total || 0
+  } catch (error) {
+    console.error("Error fetching attendances:", error)
+  } finally {
+    isLoading.value = false
+  }
+}
+
+onMounted(fetchAttendances)
+</script>
diff --git a/assets/vue/views/attendance/AttendanceSheetList.vue b/assets/vue/views/attendance/AttendanceSheetList.vue
new file mode 100644
index 0000000000..aa729f91ab
--- /dev/null
+++ b/assets/vue/views/attendance/AttendanceSheetList.vue
@@ -0,0 +1,704 @@
+<template>
+  <div class="p-4">
+    <!-- Toolbar -->
+    <BaseToolbar class="flex justify-between items-center mb-4">
+      <BaseButton
+        v-if="canEdit"
+        :label="t('Go to Calendar')"
+        icon="calendar"
+        type="info"
+        @click="redirectToCalendarList"
+      />
+      <div class="flex items-center gap-2 ml-auto">
+        <select
+          v-if="!isStudent"
+          v-model="selectedFilter"
+          @change="filterAttendanceSheets"
+          class="p-2 border border-gray-300 rounded focus:ring-primary focus:border-primary w-64"
+        >
+          <option value="all">{{ t("All") }}</option>
+          <option value="today">{{ t("Today") }}</option>
+          <option value="done">{{ t("All done") }}</option>
+          <option value="not_done">{{ t("All not done") }}</option>
+          <option
+            v-for="date in attendanceDates"
+            :key="date.id"
+            :value="date.id"
+          >
+            {{ date.label }}
+          </option>
+        </select>
+      </div>
+    </BaseToolbar>
+
+    <!-- Loading Spinner -->
+    <div
+      v-if="isLoading"
+      class="flex justify-center items-center h-64"
+    >
+      <div class="loader"></div>
+      <span class="ml-4 text-lg text-primary">{{ t("Loading attendance data...") }}</span>
+    </div>
+
+    <!-- Attendance Table -->
+    <div v-else>
+      <!-- Alert if no class today -->
+      <div
+        v-if="!isTodayScheduled"
+        class="p-4 mb-4 text-warning bg-yellow-50 border border-yellow-300 rounded"
+      >
+        {{
+          t(
+            "There is no class scheduled today, try picking another day or add your attendance entry yourself using the action icons.",
+          )
+        }}
+      </div>
+
+      <!-- Informative Message -->
+      <div class="p-4 mb-4 text-primary bg-gray-15 border border-gray-25 rounded">
+        <p>
+          {{
+            t(
+              "The attendance calendar allows you to register attendance lists (one per real session the students need to attend).",
+            )
+          }}
+        </p>
+      </div>
+
+      <!-- Attendance Sheet Table -->
+      <div class="relative flex">
+        <!-- Fixed User Information -->
+        <div
+          class="overflow-hidden flex-shrink-0"
+          style="width: 520px"
+        >
+          <table class="w-full border-collapse">
+            <thead>
+              <tr class="bg-gray-15 h-28">
+                <th class="p-3 border border-gray-25 text-left">#</th>
+                <th class="p-3 border border-gray-25 text-left">{{ t("Photo") }}</th>
+                <th class="p-3 border border-gray-25 text-left">{{ t("Last Name") }}</th>
+                <th class="p-3 border border-gray-25 text-left w-32">{{ t("First Name") }}</th>
+                <th class="p-3 border border-gray-25 text-left">{{ t("Not Attended") }}</th>
+              </tr>
+            </thead>
+            <tbody>
+              <tr
+                v-for="(user, index) in filteredAttendanceSheets"
+                :key="user.id"
+                class="hover:bg-gray-10 h-28"
+              >
+                <td class="p-3 border border-gray-25">{{ index + 1 }}</td>
+                <td class="p-3 border border-gray-25">
+                  <img
+                    :src="user.photo"
+                    alt="User photo"
+                    class="w-10 h-10 rounded-full"
+                  />
+                </td>
+                <td
+                  class="p-3 border border-gray-25 truncate"
+                  :title="user.lastName"
+                >
+                  {{ user.lastName }}
+                </td>
+                <td
+                  class="p-3 border border-gray-25 truncate"
+                  :title="user.firstName"
+                >
+                  {{ user.firstName }}
+                </td>
+                <td class="p-3 border border-gray-25 text-center">
+                  {{ user.notAttended }}
+                </td>
+              </tr>
+            </tbody>
+          </table>
+        </div>
+
+        <!-- Scrollable Dates -->
+        <div class="overflow-x-auto flex-1">
+          <table class="w-full border-collapse">
+            <thead>
+              <tr class="bg-gray-15 h-28">
+                <th
+                  v-for="date in filteredDates"
+                  :key="date.id"
+                  class="p-3 border border-gray-25 text-center align-middle"
+                  :class="{ 'bg-gray-200 cursor-not-allowed': isColumnLocked(date.id) }"
+                >
+                  <div class="flex flex-col items-center">
+                    <span class="font-bold">{{ date.label }}</span>
+                    <div
+                      class="flex gap-2 mt-1"
+                      v-if="!isStudent"
+                    >
+                      <BaseIcon
+                        icon="view-table"
+                        size="normal"
+                        @click="viewForTablet(date.id)"
+                        class="cursor-pointer text-primary"
+                        title="View for tablet"
+                      />
+                      <BaseIcon
+                        v-if="isAdmin"
+                        :icon="isColumnLocked(date.id) ? 'lock' : 'unlock'"
+                        size="normal"
+                        @click="toggleLock(date.id)"
+                        :class="isColumnLocked(date.id) ? 'text-gray-500' : 'text-warning'"
+                        :title="isColumnLocked(date.id) ? 'Unlock column' : 'Lock column'"
+                      />
+                      <BaseIcon
+                        icon="account-check"
+                        @click="setAllAttendance(date.id, 1)"
+                        class="text-success"
+                        title="Set all Present"
+                      />
+                      <BaseIcon
+                        icon="account-cancel"
+                        @click="setAllAttendance(date.id, 0)"
+                        class="text-danger"
+                        title="Set all Absent"
+                      />
+                    </div>
+                  </div>
+                </th>
+              </tr>
+            </thead>
+            <tbody>
+              <tr
+                v-for="user in filteredAttendanceSheets"
+                :key="user.id"
+                class="hover:bg-gray-10 h-28"
+              >
+                <td
+                  v-for="date in filteredDates"
+                  :key="date.id"
+                  class="p-3 border border-gray-25 text-center relative"
+                  :class="{ 'bg-gray-200': isColumnLocked(date.id) || !canEdit }"
+                >
+                  <div
+                    v-if="isColumnLocked(date.id) || !canEdit"
+                    class="cursor-not-allowed opacity-50"
+                    title="Column is locked or read-only"
+                  >
+                    <div
+                      :class="getStateIconClass(attendanceData[`${user.id}-${date.id}`])"
+                      class="w-10 h-10 rounded-full mx-auto"
+                    ></div>
+                  </div>
+
+                  <div
+                    v-else
+                    :class="getStateIconClass(attendanceData[`${user.id}-${date.id}`])"
+                    @click="openMenu(user.id, date.id)"
+                    class="w-10 h-10 rounded-full cursor-pointer mx-auto"
+                    :title="getStateLabel(attendanceData[`${user.id}-${date.id}`])"
+                  ></div>
+
+                  <div
+                    v-if="contextMenu.show && contextMenu.userId === user.id && contextMenu.dateId === date.id"
+                    class="absolute bg-white border border-gray-300 rounded shadow-lg z-10 p-2"
+                    style="top: 40px; left: 50%; transform: translateX(-50%)"
+                  >
+                    <div
+                      v-for="(state, key) in ATTENDANCE_STATES"
+                      :key="key"
+                      class="flex items-center gap-2 p-2 cursor-pointer hover:bg-gray-100 rounded"
+                      @click="selectState(user.id, date.id, state.id)"
+                    >
+                      <div
+                        :class="getStateIconClass(state.id)"
+                        class="w-5 h-5 rounded-full"
+                      ></div>
+                      <span>{{ state.label }}</span>
+                    </div>
+                  </div>
+
+                  <div
+                    v-if="canEdit"
+                    class="absolute top-2 right-2 flex gap-3"
+                  >
+                    <BaseIcon
+                      icon="comment"
+                      size="normal"
+                      @click="openCommentDialog(user.id, date.id)"
+                      class="cursor-pointer text-info"
+                    />
+                    <BaseIcon
+                      icon="drawing"
+                      size="normal"
+                      @click="openSignatureDialog(user.id, date.id)"
+                      class="cursor-pointer text-success"
+                    />
+                  </div>
+                </td>
+              </tr>
+            </tbody>
+          </table>
+        </div>
+      </div>
+
+      <!-- Save Button -->
+      <div class="mt-4 flex justify-end">
+        <BaseButton
+          v-if="canEdit"
+          :label="t('Save Attendance')"
+          icon="check"
+          type="success"
+          @click="saveAttendanceSheet"
+        />
+      </div>
+
+      <!-- Comment Dialog -->
+      <BaseDialog
+        v-model:isVisible="showCommentDialog"
+        title="Add Comment"
+      >
+        <textarea
+          v-model="currentComment"
+          class="w-full h-32 border border-gray-300 rounded"
+          placeholder="Write your comment..."
+        ></textarea>
+        <template #footer>
+          <BaseButton
+            :label="t('Save')"
+            icon="save"
+            type="success"
+            @click="saveComment"
+          />
+          <BaseButton
+            :label="t('Close')"
+            icon="close"
+            type="danger"
+            @click="closeCommentDialog"
+          />
+        </template>
+      </BaseDialog>
+
+      <!-- Signature Dialog -->
+      <BaseDialog
+        v-model:isVisible="showSignatureDialog"
+        title="Add Signature"
+      >
+        <div class="relative w-full h-48">
+          <canvas
+            ref="signaturePad"
+            class="border border-gray-300 rounded w-full h-full"
+          ></canvas>
+          <button
+            @click="clearSignature"
+            class="mt-2 text-primary"
+          >
+            Clear
+          </button>
+        </div>
+        <template #footer>
+          <BaseButton
+            :label="t('Save')"
+            icon="save"
+            type="success"
+            @click="saveSignature"
+          />
+          <BaseButton
+            :label="t('Close')"
+            icon="close"
+            type="danger"
+            @click="closeSignatureDialog"
+          />
+        </template>
+      </BaseDialog>
+    </div>
+  </div>
+</template>
+<script setup>
+import { ref, nextTick, computed, onMounted, watch } from "vue"
+import { useRouter, useRoute } from "vue-router"
+import { useI18n } from "vue-i18n"
+import SignaturePad from "signature_pad"
+import BaseToolbar from "../../components/basecomponents/BaseToolbar.vue"
+import BaseButton from "../../components/basecomponents/BaseButton.vue"
+import BaseIcon from "../../components/basecomponents/BaseIcon.vue"
+import BaseDialog from "../../components/basecomponents/BaseDialog.vue"
+import attendanceService, { ATTENDANCE_STATES } from "../../services/attendanceService"
+import { useCidReq } from "../../composables/cidReq"
+import { useSecurityStore } from "../../store/securityStore"
+
+const { t } = useI18n()
+const router = useRouter()
+const route = useRoute()
+const { sid, cid, gid } = useCidReq()
+const isLoading = ref(true)
+const securityStore = useSecurityStore()
+
+const canEdit = computed(() => securityStore.isAdmin || securityStore.isTeacher || securityStore.isHRM)
+const isStudent = computed(() => securityStore.isStudent)
+const isAdmin = computed(() => securityStore.isAdmin)
+
+const todayDate = new Date().toLocaleDateString("en-US", {
+  year: "numeric",
+  month: "short",
+  day: "2-digit",
+})
+
+const isTodayScheduled = computed(() => {
+  return attendanceDates.value.some((date) => date.label.includes(todayDate))
+})
+
+const attendanceDates = ref([])
+const attendanceSheetUsers = ref([])
+const selectedFilter = ref("all")
+const comments = ref({})
+const signatures = ref({})
+const redirectToCalendarList = () => {
+  router.push({
+    name: "CalendarList",
+    params: { id: route.params.id },
+    query: { sid, cid, gid },
+  })
+}
+
+const filteredAttendanceSheets = computed(() => {
+  if (isStudent.value) {
+    const currentUser = securityStore.user
+    return attendanceSheetUsers.value.filter((user) => user.id === currentUser?.id)
+  }
+  return attendanceSheetUsers.value
+})
+
+const saveAttendanceSheet = async () => {
+  if (!canEdit.value) return
+
+  if (!attendanceData.value || Object.keys(attendanceData.value).length === 0) {
+    alert(t("No attendance data to save."))
+    return
+  }
+
+  const preparedData = []
+
+  filteredAttendanceSheets.value.forEach((user) => {
+    filteredDates.value.forEach((date) => {
+      const key = `${user.id}-${date.id}`
+      preparedData.push({
+        userId: user.id,
+        calendarId: date.id,
+        presence: attendanceData.value[key] ?? 0,
+        comment: comments.value[key] ?? null,
+        signature: signatures.value[key] ?? null,
+      })
+    })
+  })
+
+  try {
+    const response = await attendanceService.saveAttendanceSheet({
+      courseId: parseInt(cid),
+      sessionId: sid ? parseInt(sid) : null,
+      groupId: gid ? parseInt(gid) : null,
+      attendanceData: preparedData,
+    })
+
+    console.log("Attendance data saved:", response)
+    alert(t("Attendance saved successfully"))
+  } catch (error) {
+    console.error("Error saving attendance data:", error)
+    alert(t("Failed to save attendance. Please try again."))
+  }
+}
+
+const showCommentDialog = ref(false)
+const showSignatureDialog = ref(false)
+const currentComment = ref("")
+const currentUserId = ref(null)
+const currentDateId = ref(null)
+const signaturePad = ref(null)
+const attendanceData = ref({})
+
+const fetchAttendanceSheetUsers = async () => {
+  isLoading.value = true
+  try {
+    const params = {
+      courseId: cid,
+      sessionId: sid || null,
+      groupId: gid || null,
+    }
+    const users = await attendanceService.getAttendanceSheetUsers(params)
+
+    attendanceSheetUsers.value = users.map((user) => ({
+      id: user.id,
+      photo: user.photo || "/img/default-avatar.png",
+      lastName: user.lastname,
+      firstName: user.firstname,
+      notAttended: user.notAttended,
+    }))
+  } catch (error) {
+    console.error("Failed to fetch attendance sheet users:", error)
+  } finally {
+    isLoading.value = false
+  }
+}
+
+const fetchFullAttendanceData = async (attendanceId) => {
+  isLoading.value = true
+  try {
+    const data = await attendanceService.getFullAttendanceData(attendanceId)
+    attendanceDates.value = data.attendanceDates
+    attendanceData.value = data.attendanceData
+  } catch (error) {
+    console.error("Failed to fetch attendance data:", error)
+  } finally {
+    isLoading.value = false
+  }
+}
+
+const filteredDates = ref([])
+
+const filterAttendanceSheets = () => {
+  switch (selectedFilter.value) {
+    case "all":
+      filteredDates.value = attendanceDates.value
+      break
+
+    case "done":
+      filteredDates.value = attendanceDates.value.filter((date) =>
+        Object.keys(attendanceData.value).some(
+          (key) => key.endsWith(`-${date.id}`) && attendanceData.value[key] !== null,
+        ),
+      )
+      break
+
+    case "not_done":
+      filteredDates.value = attendanceDates.value.filter(
+        (date) =>
+          !Object.keys(attendanceData.value).some(
+            (key) => key.endsWith(`-${date.id}`) && attendanceData.value[key] !== null,
+          ),
+      )
+      break
+
+    default:
+      filteredDates.value = attendanceDates.value.filter((date) => date.id === parseInt(selectedFilter.value, 10))
+      break
+  }
+}
+
+watch([attendanceDates, attendanceData, selectedFilter], filterAttendanceSheets, {
+  immediate: true,
+})
+
+const contextMenu = ref({
+  show: false,
+  userId: null,
+  dateId: null,
+})
+
+const columnLocks = ref({})
+const isColumnLocked = (dateId) => !!columnLocks.value[dateId]
+const initializeColumnLocks = (dates) => {
+  columnLocks.value = {}
+  dates.forEach((date) => {
+    columnLocks.value[date.id] = false
+  })
+}
+
+const isToggling = ref(false)
+const toggleLock = (dateId) => {
+  if (isToggling.value) return
+
+  isToggling.value = true
+  columnLocks.value = {
+    ...columnLocks.value,
+    [dateId]: !columnLocks.value[dateId],
+  }
+
+  setTimeout(() => {
+    isToggling.value = false
+  }, 100)
+}
+
+onMounted(() => {
+  fetchFullAttendanceData(route.params.id)
+  fetchAttendanceSheetUsers()
+  initializeColumnLocks(attendanceDates.value)
+})
+
+initializeColumnLocks(attendanceDates.value)
+
+const getStateLabel = (stateId) => Object.values(ATTENDANCE_STATES).find((state) => state.id === stateId)?.label
+const getStateIconClass = (stateId) => {
+  const stateColors = {
+    0: "bg-red-500", // Absent
+    1: "bg-green-500", // Present
+    2: "bg-orange-300", // Late < 15 min
+    3: "bg-orange-500", // Late > 15 min
+    4: "bg-pink-400", // Absent, justified
+  }
+  return stateColors[stateId] || "bg-gray-200"
+}
+
+const setAllAttendance = (dateId, stateId) => {
+  filteredAttendanceSheets.value.forEach((user) => {
+    attendanceData.value[`${user.id}-${dateId}`] = stateId
+  })
+}
+
+const openMenu = (userId, dateId) => {
+  contextMenu.value = { show: true, userId, dateId }
+}
+
+const closeMenu = () => {
+  contextMenu.value = { show: false, userId: null, dateId: null }
+}
+
+const selectState = (userId, dateId, stateId) => {
+  attendanceData.value[`${userId}-${dateId}`] = stateId
+  closeMenu()
+}
+
+const openCommentDialog = (userId, dateId) => {
+  const key = `${userId}-${dateId}`
+  currentUserId.value = userId
+  currentDateId.value = dateId
+  currentComment.value = comments.value[key] || ""
+  showCommentDialog.value = true
+}
+
+const openSignatureDialog = (userId, dateId) => {
+  const key = `${userId}-${dateId}`
+  currentUserId.value = userId
+  currentDateId.value = dateId
+  showSignatureDialog.value = true
+
+  nextTick(() => {
+    const canvas = document.querySelector("canvas")
+    if (canvas) {
+      canvas.width = canvas.offsetWidth
+      canvas.height = canvas.offsetHeight
+      signaturePad.value = new SignaturePad(canvas)
+
+      if (signatures.value[key]) {
+        const img = new Image()
+        img.src = signatures.value[key]
+        img.onload = () => {
+          const ctx = canvas.getContext("2d")
+          ctx.drawImage(img, 0, 0)
+        }
+      }
+    }
+  })
+}
+
+const saveComment = () => {
+  const key = `${currentUserId.value}-${currentDateId.value}`
+  comments.value[key] = currentComment.value
+  console.log(`Saved comment for ${key}:`, currentComment.value)
+  closeCommentDialog()
+}
+
+const saveSignature = () => {
+  if (signaturePad.value) {
+    const key = `${currentUserId.value}-${currentDateId.value}`
+    signatures.value[key] = signaturePad.value.toDataURL()
+    console.log(`Saved signature for ${key}`)
+  }
+  closeSignatureDialog()
+}
+
+const clearSignature = () => {
+  if (signaturePad.value) {
+    signaturePad.value.clear()
+  }
+}
+
+const closeCommentDialog = () => {
+  showCommentDialog.value = false
+}
+
+const closeSignatureDialog = () => {
+  showSignatureDialog.value = false
+}
+
+const viewForTablet = (dateId) => {
+  console.log(`View for tablet clicked for date ID: ${dateId}`)
+}
+</script>
+<style scoped>
+canvas {
+  width: 100%;
+  height: 100%;
+  display: block;
+}
+
+tr {
+  height: 100px;
+}
+th,
+td {
+  height: 100px;
+  vertical-align: middle;
+}
+
+.flex {
+  display: flex;
+}
+
+.flex-col {
+  flex-direction: column;
+}
+
+.align-middle {
+  vertical-align: middle;
+}
+
+.mt-1 {
+  margin-top: 4px;
+}
+
+.gap-2 {
+  gap: 8px;
+}
+
+.bg-red-500 {
+  background-color: #f87171;
+}
+.bg-green-500 {
+  background-color: #4ade80;
+}
+.bg-orange-300 {
+  background-color: #fdba74;
+}
+.bg-orange-500 {
+  background-color: #f97316;
+}
+.bg-pink-400 {
+  background-color: #f472b6;
+}
+.bg-gray-200 {
+  background-color: #e5e7eb;
+}
+
+.opacity-50 {
+  opacity: 0.5;
+}
+
+.cursor-not-allowed {
+  cursor: not-allowed;
+}
+
+.loader {
+  border: 4px solid #f3f3f3;
+  border-top: 4px solid #3498db;
+  border-radius: 50%;
+  width: 40px;
+  height: 40px;
+  animation: spin 1s linear infinite;
+}
+
+@keyframes spin {
+  0% {
+    transform: rotate(0deg);
+  }
+  100% {
+    transform: rotate(360deg);
+  }
+}
+</style>
diff --git a/config/services.yaml b/config/services.yaml
index a63e3d7e97..5dcf374201 100644
--- a/config/services.yaml
+++ b/config/services.yaml
@@ -89,6 +89,15 @@ services:
       tags:
         - { name: 'api_platform.state_processor' }
 
+    Chamilo\CoreBundle\State\CAttendanceStateProcessor:
+      arguments:
+        $persistProcessor: '@api_platform.doctrine.orm.state.persist_processor'
+        $entityManager: '@doctrine.orm.entity_manager'
+        $calendarRepo: '@Chamilo\CourseBundle\Repository\CAttendanceCalendarRepository'
+        $requestStack: '@request_stack'
+      tags:
+        - { name: 'api_platform.state_processor' }
+
     Chamilo\CoreBundle\State\ColorThemeStateProcessor:
       bind:
         $persistProcessor: '@api_platform.doctrine.orm.state.persist_processor'
diff --git a/src/CoreBundle/Controller/AttendanceController.php b/src/CoreBundle/Controller/AttendanceController.php
new file mode 100644
index 0000000000..22e51fef00
--- /dev/null
+++ b/src/CoreBundle/Controller/AttendanceController.php
@@ -0,0 +1,241 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Chamilo\CoreBundle\Controller;
+
+use Chamilo\CoreBundle\Entity\User;
+use Chamilo\CoreBundle\Repository\Node\UserRepository;
+use Chamilo\CourseBundle\Entity\CAttendance;
+use Chamilo\CourseBundle\Entity\CAttendanceCalendar;
+use Chamilo\CourseBundle\Entity\CAttendanceResult;
+use Chamilo\CourseBundle\Entity\CAttendanceResultComment;
+use Chamilo\CourseBundle\Entity\CAttendanceSheet;
+use Chamilo\CourseBundle\Entity\CAttendanceSheetLog;
+use Chamilo\CourseBundle\Repository\CAttendanceCalendarRepository;
+use Chamilo\CourseBundle\Repository\CAttendanceSheetRepository;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Routing\Attribute\Route;
+
+#[Route('/attendance')]
+class AttendanceController extends AbstractController
+{
+
+    public function __construct(
+        private readonly CAttendanceCalendarRepository $attendanceCalendarRepository,
+        private readonly EntityManagerInterface $em
+    ) {}
+
+    #[Route('/full-data', name: 'chamilo_core_attendance_get_full_data', methods: ['GET'])]
+    public function getFullAttendanceData(Request $request): JsonResponse
+    {
+        $attendanceId = (int) $request->query->get('attendanceId', 0);
+
+        if (!$attendanceId) {
+            return $this->json(['error' => 'Attendance ID is required'], 400);
+        }
+
+        $data = $this->attendanceCalendarRepository->findAttendanceWithData($attendanceId);
+
+        return $this->json($data, 200);
+    }
+
+    #[Route('/users/context', name: 'chamilo_core_get_users_with_faults', methods: ['GET'])]
+    public function getUsersWithFaults(
+        Request $request,
+        UserRepository $userRepository,
+        CAttendanceCalendarRepository $calendarRepository,
+        CAttendanceSheetRepository $sheetRepository
+    ): JsonResponse {
+        $courseId = (int) $request->query->get('courseId', 0);
+        $sessionId = $request->query->get('sessionId') ? (int) $request->query->get('sessionId') : null;
+        $groupId = $request->query->get('groupId') ? (int) $request->query->get('groupId') : null;
+
+        if (!$courseId) {
+            return $this->json(['error' => 'Course ID is required'], 400);
+        }
+
+        try {
+            $users = $userRepository->findUsersByContext($courseId, $sessionId, $groupId);
+
+            $totalCalendars = $calendarRepository->countByAttendanceAndGroup($courseId, $groupId);
+
+            $formattedUsers = array_map(function ($user) use ($sheetRepository, $calendarRepository, $userRepository, $courseId, $groupId, $totalCalendars) {
+                $userScore = $sheetRepository->getUserScore($user->getId(), $courseId, $groupId);
+
+                $faults = max(0, $totalCalendars - $userScore);
+                $faultsPercent = $totalCalendars > 0 ? round(($faults * 100) / $totalCalendars, 0) : 0;
+
+                return [
+                    'id' => $user->getId(),
+                    'firstname' => $user->getFirstname(),
+                    'lastname' => $user->getLastname(),
+                    'email' => $user->getEmail(),
+                    'username' => $user->getUsername(),
+                    'photo' => $userRepository->getUserPicture($user->getId()),
+                    'notAttended' => "$faults/$totalCalendars ({$faultsPercent}%)",
+                ];
+            }, $users);
+
+            return $this->json($formattedUsers, 200);
+        } catch (\Exception $e) {
+            return $this->json(['error' => 'An error occurred: ' . $e->getMessage()], 500);
+        }
+    }
+
+    #[Route('/sheet/save', name: 'chamilo_core_attendance_sheet_save', methods: ['POST'])]
+    public function saveAttendanceSheet(
+        Request $request,
+        UserRepository $userRepository,
+        CAttendanceSheetRepository $sheetRepository
+    ): JsonResponse {
+        $data = json_decode($request->getContent(), true);
+
+        if (empty($data['attendanceData']) || empty($data['courseId'])) {
+            return $this->json(['error' => 'Missing required parameters'], 400);
+        }
+
+        $attendanceData = $data['attendanceData'];
+        $courseId = (int) $data['courseId'];
+        $sessionId = isset($data['sessionId']) ? (int) $data['sessionId'] : null;
+        $groupId = isset($data['groupId']) ? (int) $data['groupId'] : null;
+
+        $usersInCourse = $userRepository->findUsersByContext($courseId, $sessionId, $groupId);
+        $userIdsInCourse = array_map(fn(User $user) => $user->getId(), $usersInCourse);
+
+        $affectedRows = 0;
+
+        try {
+            foreach ($attendanceData as $entry) {
+                $userId = (int) $entry['userId'];
+                $calendarId = (int) $entry['calendarId'];
+                $presence = isset($entry['presence']) ? (int)$entry['presence'] : null;
+                $signature = $entry['signature'] ?? null;
+                $comment = $entry['comment'] ?? null;
+
+                $calendar = $this->attendanceCalendarRepository->find($calendarId);
+                if (!$calendar) {
+                    return $this->json(['error' => "Attendance calendar with ID $calendarId not found"], 404);
+                }
+
+                $user = $this->em->getRepository(User::class)->find($userId);
+                if (!$user) {
+                    continue;
+                }
+
+                $sheet = $sheetRepository->findOneBy([
+                    'user' => $user,
+                    'attendanceCalendar' => $calendar,
+                ]) ?? new CAttendanceSheet();
+
+                $sheet->setUser($user)
+                    ->setAttendanceCalendar($calendar)
+                    ->setPresence($presence)
+                    ->setSignature($signature);
+
+                $this->em->persist($sheet);
+
+                $this->em->flush();
+
+                if ($comment !== null) {
+                    $existingComment = $this->em->getRepository(CAttendanceResultComment::class)->findOneBy([
+                        'attendanceSheetId' => $sheet->getIid(),
+                        'userId' => $user->getId(),
+                    ]);
+
+                    if (!$existingComment) {
+                        $existingComment = new CAttendanceResultComment();
+                        $existingComment->setAttendanceSheetId($sheet->getIid());
+                        $existingComment->setUserId($user->getId());
+                        $existingComment->setAuthorUserId($this->getUser()->getId());
+                    }
+
+                    $existingComment->setComment($comment);
+                    $existingComment->setUpdatedAt(new \DateTime());
+
+                    $this->em->persist($existingComment);
+                }
+            }
+
+            $calendarIds = array_unique(array_column($attendanceData, 'calendarId'));
+            foreach ($calendarIds as $calendarId) {
+                $calendar = $this->attendanceCalendarRepository->find($calendarId);
+                if ($calendar && !$calendar->getDoneAttendance()) {
+                    $calendar->setDoneAttendance(true);
+                    $this->em->persist($calendar);
+                }
+            }
+
+            $calendars = $this->attendanceCalendarRepository->findBy(['iid' => $calendarIds]);
+            $attendance = $calendars[0]->getAttendance();
+            $this->updateAttendanceResults($attendance);
+
+            $lasteditType = $calendars[0]->getDoneAttendance()
+                ? 'UPDATED_ATTENDANCE_LOG_TYPE'
+                : 'DONE_ATTENDANCE_LOG_TYPE';
+
+            foreach ($calendars as $calendar) {
+                $this->saveAttendanceLog($attendance, $lasteditType, $calendar);
+            }
+
+            $this->em->flush();
+
+            return $this->json([
+                'message' => 'Attendance data and comments saved successfully',
+                'affectedRows' => $affectedRows,
+            ]);
+
+        } catch (\Exception $e) {
+            return $this->json(['error' => 'An error occurred: ' . $e->getMessage()], 500);
+        }
+    }
+
+    private function updateAttendanceResults(CAttendance $attendance): void
+    {
+        $sheets = $attendance->getCalendars()->map(fn ($calendar) => $calendar->getSheets())->toArray();
+        $results = [];
+
+        foreach ($sheets as $calendarSheets) {
+            foreach ($calendarSheets as $sheet) {
+                $userId = $sheet->getUser()->getId();
+                $results[$userId] = ($results[$userId] ?? 0) + $sheet->getPresence();
+            }
+        }
+
+        foreach ($results as $userId => $score) {
+            $user = $this->em->getRepository(User::class)->find($userId);
+            if (!$user) {
+                continue;
+            }
+
+            $result = $this->em->getRepository(CAttendanceResult::class)->findOneBy([
+                'user' => $user,
+                'attendance' => $attendance,
+            ]);
+
+            if (!$result) {
+                $result = new CAttendanceResult();
+                $result->setUser($user);
+                $result->setAttendance($attendance);
+            }
+
+            $result->setScore((int) $score);
+            $this->em->persist($result);
+        }
+    }
+
+    private function saveAttendanceLog(CAttendance $attendance, string $lasteditType, CAttendanceCalendar $calendar): void
+    {
+        $log = new CAttendanceSheetLog();
+        $log->setAttendance($attendance)
+            ->setLasteditDate(new \DateTime())
+            ->setLasteditType($lasteditType)
+            ->setCalendarDateValue($calendar->getDateTime())
+            ->setUser($this->getUser());
+
+        $this->em->persist($log);
+    }
+}
diff --git a/src/CoreBundle/Controller/GradebookController.php b/src/CoreBundle/Controller/GradebookController.php
index d2a7f8b862..56a88eb359 100644
--- a/src/CoreBundle/Controller/GradebookController.php
+++ b/src/CoreBundle/Controller/GradebookController.php
@@ -5,16 +5,49 @@ declare(strict_types=1);
 namespace Chamilo\CoreBundle\Controller;
 
 use Chamilo\CoreBundle\Entity\GradebookCategory;
+use Chamilo\CoreBundle\Repository\GradeBookCategoryRepository;
 use Chamilo\CourseBundle\Entity\CDocument;
 use Doctrine\ORM\EntityManagerInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\Routing\Attribute\Route;
 
 #[Route('/gradebook')]
 class GradebookController extends AbstractController
 {
+    public function __construct(
+        private readonly GradeBookCategoryRepository $gradeBookCategoryRepository,
+    ) {}
+
+    #[Route('/categories', name: 'chamilo_core_gradebook_categories', methods: ['GET'])]
+    public function getCategories(Request $request): JsonResponse
+    {
+        // Extract parameters from the query string
+        $courseId = (int) $request->query->get('courseId');
+        $sessionId = $request->query->get('sessionId') ? (int) $request->query->get('sessionId') : null;
+
+        if (!$courseId) {
+            return new JsonResponse(['error' => 'courseId parameter is required'], Response::HTTP_BAD_REQUEST);
+        }
+
+        // Ensure the default category exists
+        $this->gradeBookCategoryRepository->createDefaultCategory($courseId, $sessionId);
+
+        // Fetch categories using the repository
+        $categories = $this->gradeBookCategoryRepository->getCategoriesForCourse($courseId, $sessionId);
+
+        // Format the response
+        $formatted = array_map(fn($category) => [
+            'id' => $category->getId(),
+            'title' => $category->getTitle(),
+            'parentId' => $category->getParent()?->getId(),
+        ], $categories);
+
+        return new JsonResponse($formatted);
+    }
+
     // Sets the default certificate for a gradebook category
     #[Route('/set_default_certificate/{cid}/{certificateId}', name: 'chamilo_core_gradebook_set_default_certificate')]
     public function setDefaultCertificate(int $cid, int $certificateId, EntityManagerInterface $entityManager): Response
diff --git a/src/CoreBundle/Entity/AbstractResource.php b/src/CoreBundle/Entity/AbstractResource.php
index e1d08751ea..8ecc7c6a4f 100644
--- a/src/CoreBundle/Entity/AbstractResource.php
+++ b/src/CoreBundle/Entity/AbstractResource.php
@@ -70,6 +70,7 @@ abstract class AbstractResource
         'illustration:read',
         'message:read',
         'c_tool_intro:read',
+        'attendance:read',
     ])]
     #[ORM\OneToOne(targetEntity: ResourceNode::class, cascade: ['persist'])]
     #[ORM\JoinColumn(name: 'resource_node_id', referencedColumnName: 'id', onDelete: 'CASCADE')]
@@ -96,7 +97,7 @@ abstract class AbstractResource
      */
     public $parentResource;
 
-    #[Groups(['resource_node:read', 'document:read'])]
+    #[Groups(['resource_node:read', 'document:read', 'attendance:read'])]
     public ?array $resourceLinkListFromEntity = null;
 
     /**
@@ -105,7 +106,7 @@ abstract class AbstractResource
      *
      * @var array<int, array<string, int>>
      */
-    #[Groups(['c_tool_intro:write', 'resource_node:write', 'c_student_publication:write', 'calendar_event:write'])]
+    #[Groups(['c_tool_intro:write', 'resource_node:write', 'c_student_publication:write', 'calendar_event:write', 'attendance:write'])]
     public array $resourceLinkList = [];
 
     /**
diff --git a/src/CoreBundle/Migrations/Schema/V200/Version20250126180000.php b/src/CoreBundle/Migrations/Schema/V200/Version20250126180000.php
new file mode 100644
index 0000000000..45aee12545
--- /dev/null
+++ b/src/CoreBundle/Migrations/Schema/V200/Version20250126180000.php
@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+/* For licensing terms, see /license.txt */
+
+namespace Chamilo\CoreBundle\Migrations\Schema\V200;
+
+use Chamilo\CoreBundle\Migrations\AbstractMigrationChamilo;
+use Doctrine\DBAL\Schema\Schema;
+
+final class Version20250126180000 extends AbstractMigrationChamilo
+{
+    public function getDescription(): string
+    {
+        return 'Update the presence column in c_attendance_sheet from TINYINT(1) to INT to allow multiple attendance statuses.';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // Alter the column type to integer
+        $this->addSql('ALTER TABLE c_attendance_sheet MODIFY presence INT NULL');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // Revert the column type back to TINYINT(1)
+        $this->addSql('ALTER TABLE c_attendance_sheet MODIFY presence TINYINT(1) NOT NULL');
+    }
+}
diff --git a/src/CoreBundle/Repository/GradeBookCategoryRepository.php b/src/CoreBundle/Repository/GradeBookCategoryRepository.php
index 38322d0f85..d4c9e2391a 100644
--- a/src/CoreBundle/Repository/GradeBookCategoryRepository.php
+++ b/src/CoreBundle/Repository/GradeBookCategoryRepository.php
@@ -6,14 +6,77 @@ declare(strict_types=1);
 
 namespace Chamilo\CoreBundle\Repository;
 
+use Chamilo\CoreBundle\Entity\Course;
 use Chamilo\CoreBundle\Entity\GradebookCategory;
+use Chamilo\CoreBundle\Entity\Session;
 use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
+use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\Persistence\ManagerRegistry;
 
 class GradeBookCategoryRepository extends ServiceEntityRepository
 {
-    public function __construct(ManagerRegistry $registry)
+    private EntityManagerInterface $entityManager;
+
+    public function __construct(ManagerRegistry $registry, EntityManagerInterface $entityManager)
     {
         parent::__construct($registry, GradebookCategory::class);
+        $this->entityManager = $entityManager;
+    }
+
+    /**
+     * Retrieves gradebook categories for a specific course and optional session.
+     *
+     * @param int $courseId The ID of the course.
+     * @param int|null $sessionId The ID of the session (optional).
+     * @return GradebookCategory[] A list of gradebook categories.
+     */
+    public function getCategoriesForCourse(int $courseId, ?int $sessionId = null): array
+    {
+        $qb = $this->createQueryBuilder('gc')
+            ->where('gc.course = :courseId')
+            ->setParameter('courseId', $courseId);
+
+        if ($sessionId !== null) {
+            $qb->andWhere('gc.session = :sessionId')
+                ->setParameter('sessionId', $sessionId);
+        } else {
+            $qb->andWhere('gc.session IS NULL');
+        }
+
+        $qb->orderBy('gc.title', 'ASC');
+
+        return $qb->getQuery()->getResult();
+    }
+
+    /**
+     * Creates a default gradebook category for a course if it doesn't already exist.
+     *
+     * @param int $courseId The ID of the course.
+     * @param int|null $sessionId The ID of the session (optional).
+     * @return GradebookCategory The default category.
+     */
+    public function createDefaultCategory(int $courseId, ?int $sessionId = null): GradebookCategory
+    {
+        $existingCategory = $this->findOneBy([
+            'course' => $courseId,
+            'session' => $sessionId,
+            'parent' => null, // Root category
+        ]);
+
+        if ($existingCategory) {
+            return $existingCategory; // Return existing category
+        }
+
+        $defaultCategory = new GradebookCategory();
+        $defaultCategory->setTitle('Default');
+        $defaultCategory->setCourse($this->entityManager->getReference(Course::class, $courseId));
+        $defaultCategory->setSession($sessionId ? $this->entityManager->getReference(Session::class, $sessionId) : null);
+        $defaultCategory->setWeight(1.0);
+        $defaultCategory->setVisible(true);
+
+        $this->entityManager->persist($defaultCategory);
+        $this->entityManager->flush();
+
+        return $defaultCategory;
     }
 }
diff --git a/src/CoreBundle/Repository/Node/UserRepository.php b/src/CoreBundle/Repository/Node/UserRepository.php
index 9e7d2cb04c..a42ddbc5cb 100644
--- a/src/CoreBundle/Repository/Node/UserRepository.php
+++ b/src/CoreBundle/Repository/Node/UserRepository.php
@@ -8,11 +8,13 @@ namespace Chamilo\CoreBundle\Repository\Node;
 
 use Chamilo\CoreBundle\Entity\AccessUrl;
 use Chamilo\CoreBundle\Entity\Course;
+use Chamilo\CoreBundle\Entity\CourseRelUser;
 use Chamilo\CoreBundle\Entity\ExtraField;
 use Chamilo\CoreBundle\Entity\ExtraFieldValues;
 use Chamilo\CoreBundle\Entity\Message;
 use Chamilo\CoreBundle\Entity\ResourceNode;
 use Chamilo\CoreBundle\Entity\Session;
+use Chamilo\CoreBundle\Entity\SessionRelCourseRelUser;
 use Chamilo\CoreBundle\Entity\Tag;
 use Chamilo\CoreBundle\Entity\TrackELogin;
 use Chamilo\CoreBundle\Entity\TrackEOnline;
@@ -22,6 +24,7 @@ use Chamilo\CoreBundle\Entity\UsergroupRelUser;
 use Chamilo\CoreBundle\Entity\UserRelTag;
 use Chamilo\CoreBundle\Entity\UserRelUser;
 use Chamilo\CoreBundle\Repository\ResourceRepository;
+use Chamilo\CourseBundle\Entity\CGroupRelUser;
 use Datetime;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\Common\Collections\Criteria;
@@ -1123,4 +1126,50 @@ class UserRepository extends ResourceRepository implements PasswordUpgraderInter
 
         return $qb->getQuery()->getResult();
     }
+
+    public function findUsersByContext(int $courseId, ?int $sessionId = null, ?int $groupId = null): array
+    {
+        $course = $this->_em->getRepository(Course::class)->find($courseId);
+        if (!$course) {
+            throw new \InvalidArgumentException('Course not found.');
+        }
+
+        if ($sessionId !== null) {
+            $session = $this->_em->getRepository(Session::class)->find($sessionId);
+            if (!$session) {
+                throw new \InvalidArgumentException('Session not found.');
+            }
+
+            $list = $session->getSessionRelCourseRelUsersByStatus($course, Session::STUDENT);
+            $users = [];
+
+            if ($list) {
+                foreach ($list as $sessionCourseUser) {
+                    $users[$sessionCourseUser->getUser()->getId()] = $sessionCourseUser->getUser();
+                }
+            }
+
+            return array_values($users);
+        }
+
+        if ($groupId !== null) {
+            $qb = $this->_em->createQueryBuilder();
+            $qb->select('u')
+                ->from(CGroupRelUser::class, 'cgru')
+                ->innerJoin('cgru.user', 'u')
+                ->where('cgru.cId = :courseId')
+                ->andWhere('cgru.group = :groupId')
+                ->setParameters([
+                    'courseId' => $courseId,
+                    'groupId' => $groupId,
+                ])
+                ->orderBy('u.lastname', 'ASC')
+                ->addOrderBy('u.firstname', 'ASC');
+
+            return $qb->getQuery()->getResult();
+        }
+
+        $queryBuilder = $this->_em->getRepository(Course::class)->getSubscribedStudents($course);
+        return $queryBuilder->getQuery()->getResult();
+    }
 }
diff --git a/src/CoreBundle/State/CAttendanceStateProcessor.php b/src/CoreBundle/State/CAttendanceStateProcessor.php
new file mode 100644
index 0000000000..1382ee2b73
--- /dev/null
+++ b/src/CoreBundle/State/CAttendanceStateProcessor.php
@@ -0,0 +1,133 @@
+<?php
+
+/* For licensing terms, see /license.txt */
+
+declare(strict_types=1);
+
+namespace Chamilo\CoreBundle\State;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\State\ProcessorInterface;
+use Chamilo\CourseBundle\Entity\CAttendance;
+use Chamilo\CourseBundle\Entity\CAttendanceCalendar;
+use Chamilo\CourseBundle\Entity\CAttendanceCalendarRelGroup;
+use Chamilo\CourseBundle\Repository\CAttendanceCalendarRepository;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
+
+final class CAttendanceStateProcessor implements ProcessorInterface
+{
+    public function __construct(
+        private readonly ProcessorInterface $persistProcessor,
+        private readonly EntityManagerInterface $entityManager,
+        private readonly CAttendanceCalendarRepository $calendarRepo,
+        private readonly RequestStack $requestStack
+    ) {}
+
+    /**
+     * Main process function for handling attendance and calendar operations.
+     */
+    public function process($data, Operation $operation, array $uriVariables = [], array $context = []): void
+    {
+        \assert($data instanceof CAttendance);
+
+        $operationName = $operation->getName();
+
+        error_log("Processing $operationName");
+
+        match ($operationName) {
+            'toggle_visibility' => $this->handleToggleVisibility($data),
+            'soft_delete' => $this->handleSoftDelete($data),
+            'calendar_add' => $this->handleAddCalendar($data),
+            default => throw new BadRequestHttpException('Operation not supported.'),
+        };
+
+        $this->persistProcessor->process($data, $operation, $uriVariables, $context);
+    }
+
+    private function handleToggleVisibility(CAttendance $attendance): void
+    {
+        $attendance->setActive($attendance->getActive() === 1 ? 0 : 1);
+        $this->entityManager->persist($attendance);
+    }
+
+    private function handleSoftDelete(CAttendance $attendance): void
+    {
+        $attendance->setActive(2);
+        $this->entityManager->persist($attendance);
+    }
+
+    private function handleAddCalendar(CAttendance $attendance): void
+    {
+        $request = $this->requestStack->getCurrentRequest();
+        $data = json_decode($request->getContent(), true);
+
+        if (!$data) {
+            throw new BadRequestHttpException('Request data is required to create a calendar.');
+        }
+
+        $startDate = new \DateTime($data['startDate']);
+        $repeatDate = $data['repeatDate'] ?? false;
+        $repeatType = $data['repeatType'] ?? null;
+        $repeatDays = $data['repeatDays'] ?? null;
+        $endDate = $repeatDate ? new \DateTime($data['repeatEndDate']) : null;
+        $groupId = $data['group'] ?? 0;
+
+        $this->saveCalendar($attendance, $startDate, $groupId);
+
+        if ($repeatDate && $repeatType && $endDate) {
+            $interval = $this->getRepeatInterval($repeatType, $repeatDays);
+            $currentDate = clone $startDate;
+
+            while ($currentDate < $endDate) {
+                $currentDate->add($interval);
+                $this->saveCalendar($attendance, $currentDate, $groupId);
+            }
+        }
+    }
+
+    private function saveCalendar(CAttendance $attendance, \DateTime $date, ?int $groupId): void
+    {
+        $existingCalendar = $this->calendarRepo->findOneBy([
+            'attendance' => $attendance->getIid(),
+            'dateTime' => $date,
+        ]);
+
+        if ($existingCalendar) {
+
+            return;
+        }
+
+        $calendar = new CAttendanceCalendar();
+        $calendar->setAttendance($attendance);
+        $calendar->setDateTime($date);
+        $calendar->setDoneAttendance(false);
+        $calendar->setBlocked(false);
+
+        $this->entityManager->persist($calendar);
+        $this->entityManager->flush();
+
+        if (!empty($groupId)) {
+            $this->addAttendanceCalendarToGroup($calendar, $groupId);
+        }
+    }
+
+    private function addAttendanceCalendarToGroup(CAttendanceCalendar $calendar, int $groupId): void
+    {
+        $repository = $this->entityManager->getRepository(CAttendanceCalendarRelGroup::class);
+        $repository->addGroupToCalendar($calendar->getIid(), $groupId);
+    }
+
+    private function getRepeatInterval(string $repeatType, ?int $repeatDays = null): \DateInterval
+    {
+        return match ($repeatType) {
+            'daily' => new \DateInterval('P1D'),
+            'weekly' => new \DateInterval('P7D'),
+            'bi-weekly' => new \DateInterval('P14D'),
+            'every-x-days' => new \DateInterval("P{$repeatDays}D"),
+            'monthly-by-date' => new \DateInterval('P1M'),
+            default => throw new BadRequestHttpException('Invalid repeat type.'),
+        };
+    }
+}
diff --git a/src/CoreBundle/Tool/Attendance.php b/src/CoreBundle/Tool/Attendance.php
index 560d6b14bf..da8337cf0b 100644
--- a/src/CoreBundle/Tool/Attendance.php
+++ b/src/CoreBundle/Tool/Attendance.php
@@ -17,7 +17,7 @@ class Attendance extends AbstractTool implements ToolInterface
 
     public function getLink(): string
     {
-        return '/main/attendance/index.php';
+        return '/resources/attendance/:nodeId/';
     }
 
     public function getIcon(): string
diff --git a/src/CourseBundle/Entity/CAttendance.php b/src/CourseBundle/Entity/CAttendance.php
index ec74510dba..a734290954 100644
--- a/src/CourseBundle/Entity/CAttendance.php
+++ b/src/CourseBundle/Entity/CAttendance.php
@@ -6,37 +6,110 @@ declare(strict_types=1);
 
 namespace Chamilo\CourseBundle\Entity;
 
+use ApiPlatform\Doctrine\Orm\Filter\SearchFilter;
+use ApiPlatform\Metadata\ApiFilter;
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Delete;
+use ApiPlatform\Metadata\Get;
+use ApiPlatform\Metadata\GetCollection;
+use ApiPlatform\Metadata\Post;
+use ApiPlatform\Metadata\Put;
 use Chamilo\CoreBundle\Entity\AbstractResource;
 use Chamilo\CoreBundle\Entity\ResourceInterface;
+use Chamilo\CoreBundle\State\CAttendanceStateProcessor;
 use Chamilo\CourseBundle\Repository\CAttendanceRepository;
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
 use Stringable;
+use Symfony\Component\Serializer\Annotation\Groups;
 use Symfony\Component\Validator\Constraints as Assert;
 
+#[ApiResource(
+    shortName: 'Attendances',
+    operations: [
+        new Put(
+            uriTemplate: '/attendances/{iid}/toggle_visibility',
+            openapiContext: [
+                'summary' => 'Toggle visibility of the attendance\'s associated ResourceLink',
+            ],
+            security: "is_granted('EDIT', object.resourceNode)",
+            name: 'toggle_visibility',
+            processor: CAttendanceStateProcessor::class
+        ),
+        new Put(
+            uriTemplate: '/attendances/{iid}/soft_delete',
+            openapiContext: [
+                'summary' => 'Soft delete the attendance',
+            ],
+            security: "is_granted('EDIT', object.resourceNode)",
+            name: 'soft_delete',
+            processor: CAttendanceStateProcessor::class
+        ),
+        new Delete(security: "is_granted('ROLE_TEACHER')"),
+        new Post(
+            uriTemplate: '/attendances/{iid}/calendars',
+            openapiContext: ['summary' => 'Add a calendar to an attendance.'],
+            denormalizationContext: ['groups' => ['attendance:write']],
+            name: 'calendar_add',
+            processor: CAttendanceStateProcessor::class
+        ),
+        new GetCollection(
+            openapiContext: [
+                'parameters' => [
+                    [
+                        'name' => 'resourceNode.parent',
+                        'in' => 'query',
+                        'required' => true,
+                        'description' => 'Resource node Parent',
+                        'schema' => ['type' => 'integer'],
+                    ],
+                ],
+            ],
+        ),
+        new Get(security: "is_granted('VIEW', object.resourceNode)"),
+        new Post(
+            denormalizationContext: ['groups' => ['attendance:write']],
+            security: "is_granted('ROLE_TEACHER')",
+            validationContext: ['groups' => ['Default']]
+        ),
+        new Put(
+            denormalizationContext: ['groups' => ['attendance:write']],
+            security: "is_granted('ROLE_TEACHER')"
+        ),
+    ],
+    normalizationContext: ['groups' => ['attendance:read']],
+    denormalizationContext: ['groups' => ['attendance:write']],
+    paginationEnabled: true,
+)]
+#[ApiFilter(SearchFilter::class, properties: ['active' => 'exact', 'title' => 'partial', 'resourceNode.parent' => 'exact'])]
 #[ORM\Table(name: 'c_attendance')]
-#[ORM\Index(name: 'active', columns: ['active'])]
+#[ORM\Index(columns: ['active'], name: 'active')]
 #[ORM\Entity(repositoryClass: CAttendanceRepository::class)]
 class CAttendance extends AbstractResource implements ResourceInterface, Stringable
 {
     #[ORM\Column(name: 'iid', type: 'integer')]
     #[ORM\Id]
     #[ORM\GeneratedValue]
+    #[Groups(['attendance:read'])]
     protected ?int $iid = null;
 
     #[Assert\NotBlank]
     #[ORM\Column(name: 'title', type: 'text', nullable: false)]
+    #[Groups(['attendance:read', 'attendance:write'])]
     protected string $title;
 
     #[ORM\Column(name: 'description', type: 'text', nullable: true)]
-    protected ?string $description;
+    #[Groups(['attendance:read', 'attendance:write'])]
+    protected ?string $description = null;
 
     #[Assert\NotBlank]
     #[ORM\Column(name: 'active', type: 'integer', nullable: false)]
-    protected int $active;
+    #[Groups(['attendance:read', 'attendance:write'])]
+    protected int $active = 1;
 
     #[ORM\Column(name: 'attendance_qualify_title', type: 'string', length: 255, nullable: true)]
+    #[Groups(['attendance:read', 'attendance:write'])]
     protected ?string $attendanceQualifyTitle = null;
 
     #[Assert\NotNull]
@@ -45,7 +118,8 @@ class CAttendance extends AbstractResource implements ResourceInterface, Stringa
 
     #[Assert\NotNull]
     #[ORM\Column(name: 'attendance_weight', type: 'float', precision: 6, scale: 2, nullable: false)]
-    protected float $attendanceWeight;
+    #[Groups(['attendance:read', 'attendance:write'])]
+    protected float $attendanceWeight = 0.0;
 
     #[Assert\NotNull]
     #[ORM\Column(name: 'locked', type: 'integer', nullable: false)]
@@ -54,19 +128,20 @@ class CAttendance extends AbstractResource implements ResourceInterface, Stringa
     /**
      * @var Collection|CAttendanceCalendar[]
      */
-    #[ORM\OneToMany(targetEntity: CAttendanceCalendar::class, mappedBy: 'attendance', cascade: ['persist', 'remove'])]
+    #[ORM\OneToMany(mappedBy: 'attendance', targetEntity: CAttendanceCalendar::class, cascade: ['persist', 'remove'])]
+    #[Groups(['attendance:read'])]
     protected Collection $calendars;
 
     /**
      * @var Collection|CAttendanceResult[]
      */
-    #[ORM\OneToMany(targetEntity: CAttendanceResult::class, mappedBy: 'attendance', cascade: ['persist', 'remove'])]
+    #[ORM\OneToMany(mappedBy: 'attendance', targetEntity: CAttendanceResult::class, cascade: ['persist', 'remove'])]
     protected Collection $results;
 
     /**
      * @var Collection|CAttendanceSheetLog[]
      */
-    #[ORM\OneToMany(targetEntity: CAttendanceSheetLog::class, mappedBy: 'attendance', cascade: ['persist', 'remove'])]
+    #[ORM\OneToMany(mappedBy: 'attendance', targetEntity: CAttendanceSheetLog::class, cascade: ['persist', 'remove'])]
     protected Collection $logs;
 
     public function __construct()
@@ -145,7 +220,7 @@ class CAttendance extends AbstractResource implements ResourceInterface, Stringa
      *
      * @return int
      */
-    public function getAttendanceQualifyMax()
+    public function getAttendanceQualifyMax(): int
     {
         return $this->attendanceQualifyMax;
     }
@@ -162,7 +237,7 @@ class CAttendance extends AbstractResource implements ResourceInterface, Stringa
      *
      * @return float
      */
-    public function getAttendanceWeight()
+    public function getAttendanceWeight(): float
     {
         return $this->attendanceWeight;
     }
@@ -179,7 +254,7 @@ class CAttendance extends AbstractResource implements ResourceInterface, Stringa
      *
      * @return int
      */
-    public function getLocked()
+    public function getLocked(): int
     {
         return $this->locked;
     }
@@ -201,6 +276,16 @@ class CAttendance extends AbstractResource implements ResourceInterface, Stringa
         return $this;
     }
 
+    public function addCalendar(CAttendanceCalendar $calendar): self
+    {
+        if (!$this->calendars->contains($calendar)) {
+            $this->calendars->add($calendar);
+            $calendar->setAttendance($this);
+        }
+
+        return $this;
+    }
+
     /**
      * @return CAttendanceSheetLog[]|Collection
      */
diff --git a/src/CourseBundle/Entity/CAttendanceCalendar.php b/src/CourseBundle/Entity/CAttendanceCalendar.php
index c1b948be33..082199560d 100644
--- a/src/CourseBundle/Entity/CAttendanceCalendar.php
+++ b/src/CourseBundle/Entity/CAttendanceCalendar.php
@@ -6,10 +6,18 @@ declare(strict_types=1);
 
 namespace Chamilo\CourseBundle\Entity;
 
+use ApiPlatform\Metadata\ApiResource;
 use DateTime;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
-
+use Symfony\Component\Serializer\Annotation\Groups;
+
+#[ApiResource(
+    normalizationContext: ['groups' => ['attendance_calendar:read']],
+    denormalizationContext: ['groups' => ['attendance_calendar:write']],
+    paginationEnabled: false,
+    security: "is_granted('ROLE_TEACHER')"
+)]
 #[ORM\Table(name: 'c_attendance_calendar')]
 #[ORM\Index(columns: ['done_attendance'], name: 'done_attendance')]
 #[ORM\Entity]
@@ -18,21 +26,29 @@ class CAttendanceCalendar
     #[ORM\Column(name: 'iid', type: 'integer')]
     #[ORM\Id]
     #[ORM\GeneratedValue]
+    #[Groups(['attendance:read', 'attendance_calendar:read'])]
     protected ?int $iid = null;
 
-    #[ORM\ManyToOne(targetEntity: CAttendance::class, cascade: ['remove'], inversedBy: 'calendars')]
+    #[ORM\ManyToOne(targetEntity: CAttendance::class, inversedBy: 'calendars')]
     #[ORM\JoinColumn(name: 'attendance_id', referencedColumnName: 'iid', onDelete: 'CASCADE')]
+    #[Groups(['attendance:write', 'attendance:read', 'attendance_calendar:read'])]
     protected CAttendance $attendance;
 
     #[ORM\Column(name: 'date_time', type: 'datetime', nullable: false)]
+    #[Groups(['attendance:read', 'attendance:write', 'attendance_calendar:read', 'attendance_calendar:write'])]
     protected DateTime $dateTime;
 
     #[ORM\Column(name: 'done_attendance', type: 'boolean', nullable: false)]
+    #[Groups(['attendance:read', 'attendance:write'])]
     protected bool $doneAttendance;
 
     #[ORM\Column(name: 'blocked', type: 'boolean', nullable: false)]
+    #[Groups(['attendance:read', 'attendance:write'])]
     protected bool $blocked;
 
+    #[ORM\Column(name: 'duration', type: 'integer', nullable: true)]
+    protected ?int $duration = null;
+
     /**
      * @var Collection<int, CAttendanceSheet>
      */
@@ -43,9 +59,6 @@ class CAttendanceCalendar
     )]
     protected Collection $sheets;
 
-    #[ORM\Column(name: 'duration', type: 'integer', nullable: true)]
-    protected ?int $duration = null;
-
     public function getIid(): ?int
     {
         return $this->iid;
diff --git a/src/CourseBundle/Entity/CAttendanceCalendarRelGroup.php b/src/CourseBundle/Entity/CAttendanceCalendarRelGroup.php
index e6097995a7..3ca13f31da 100644
--- a/src/CourseBundle/Entity/CAttendanceCalendarRelGroup.php
+++ b/src/CourseBundle/Entity/CAttendanceCalendarRelGroup.php
@@ -6,13 +6,14 @@ declare(strict_types=1);
 
 namespace Chamilo\CourseBundle\Entity;
 
+use Chamilo\CourseBundle\Repository\CAttendanceCalendarRelGroupRepository;
 use Doctrine\ORM\Mapping as ORM;
 
 /**
  * CAttendanceCalendarRelGroup.
  */
 #[ORM\Table(name: 'c_attendance_calendar_rel_group')]
-#[ORM\Entity]
+#[ORM\Entity(repositoryClass: CAttendanceCalendarRelGroupRepository::class)]
 class CAttendanceCalendarRelGroup
 {
     #[ORM\Column(name: 'iid', type: 'integer')]
diff --git a/src/CourseBundle/Entity/CAttendanceResult.php b/src/CourseBundle/Entity/CAttendanceResult.php
index 6ba9969742..be182a95d5 100644
--- a/src/CourseBundle/Entity/CAttendanceResult.php
+++ b/src/CourseBundle/Entity/CAttendanceResult.php
@@ -21,6 +21,7 @@ class CAttendanceResult
 
     #[ORM\ManyToOne(targetEntity: User::class)]
     #[ORM\JoinColumn(name: 'user_id', referencedColumnName: 'id', onDelete: 'CASCADE')]
+    #[Groups(['attendance:read'])]
     protected User $user;
 
     #[ORM\ManyToOne(targetEntity: CAttendance::class, inversedBy: 'results')]
diff --git a/src/CourseBundle/Entity/CAttendanceSheet.php b/src/CourseBundle/Entity/CAttendanceSheet.php
index 3d9fc32819..1554a39021 100644
--- a/src/CourseBundle/Entity/CAttendanceSheet.php
+++ b/src/CourseBundle/Entity/CAttendanceSheet.php
@@ -20,9 +20,19 @@ class CAttendanceSheet
     #[ORM\GeneratedValue]
     protected ?int $iid = null;
 
+    /**
+     * Attendance status for each user on a given date:
+     * - 0: Absent (Score: 0)
+     * - 1: Present (Score: 1)
+     * - 2: Late less than 15 minutes (Score: 1)
+     * - 3: Late more than 15 minutes (Score: 0.5)
+     * - 4: Absent but justified (Score: 0.25)
+     *
+     * Scores are tentative and can be used for gradebook calculations.
+     */
     #[Assert\NotNull]
-    #[ORM\Column(name: 'presence', type: 'boolean', nullable: false)]
-    protected bool $presence;
+    #[ORM\Column(name: 'presence', type: 'integer', nullable: true)]
+    protected ?int $presence = null;
 
     #[ORM\ManyToOne(targetEntity: User::class)]
     #[ORM\JoinColumn(name: 'user_id', referencedColumnName: 'id', onDelete: 'CASCADE')]
@@ -33,28 +43,33 @@ class CAttendanceSheet
     protected CAttendanceCalendar $attendanceCalendar;
 
     #[ORM\Column(name: 'signature', type: 'text', nullable: true)]
-    protected string $signature;
+    protected ?string $signature;
 
-    public function setPresence(bool $presence): self
+    public function getIid(): ?int
+    {
+        return $this->iid;
+    }
+
+    public function setPresence(?int $presence): self
     {
         $this->presence = $presence;
 
         return $this;
     }
 
-    public function getPresence(): bool
+    public function getPresence(): ?int
     {
         return $this->presence;
     }
 
-    public function setSignature(string $signature): static
+    public function setSignature(?string $signature): static
     {
         $this->signature = $signature;
 
         return $this;
     }
 
-    public function getSignature(): string
+    public function getSignature(): ?string
     {
         return $this->signature;
     }
diff --git a/src/CourseBundle/Entity/CGroup.php b/src/CourseBundle/Entity/CGroup.php
index c2f39ca605..6c4c079f43 100644
--- a/src/CourseBundle/Entity/CGroup.php
+++ b/src/CourseBundle/Entity/CGroup.php
@@ -6,23 +6,47 @@ declare(strict_types=1);
 
 namespace Chamilo\CourseBundle\Entity;
 
+use ApiPlatform\Doctrine\Orm\Filter\SearchFilter;
+use ApiPlatform\Metadata\ApiFilter;
 use ApiPlatform\Metadata\ApiResource;
-use Chamilo\CoreBundle\Entity\AbstractResource;
-use Chamilo\CoreBundle\Entity\ResourceInterface;
-use Chamilo\CoreBundle\Entity\User;
+use ApiPlatform\Metadata\GetCollection;
+use ApiPlatform\Metadata\Get;
 use Chamilo\CourseBundle\Repository\CGroupRepository;
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
+use Chamilo\CoreBundle\Entity\AbstractResource;
+use Chamilo\CoreBundle\Entity\ResourceInterface;
+use Chamilo\CoreBundle\Entity\User;
 use Stringable;
 use Symfony\Component\Serializer\Annotation\Groups;
 use Symfony\Component\Uid\Uuid;
 use Symfony\Component\Validator\Constraints as Assert;
 
-/**
- * Course groups.
- */
-#[ApiResource(normalizationContext: ['groups' => ['group:read']], security: "is_granted('ROLE_ADMIN')")]
+#[ApiResource(
+    shortName: 'Groups',
+    operations: [
+        new GetCollection(
+            uriTemplate: '/groups',
+            openapiContext: [
+                'parameters' => [
+                    [
+                        'name' => 'resourceNode.parent',
+                        'in' => 'query',
+                        'required' => true,
+                        'description' => 'Filter groups by the parent resource node (course)',
+                        'schema' => ['type' => 'integer'],
+                    ],
+                ],
+            ]
+        ),
+        new Get(security: "is_granted('VIEW', object.resourceNode)")
+    ],
+    normalizationContext: ['groups' => ['group:read']],
+    denormalizationContext: ['groups' => ['group:write']],
+    paginationEnabled: true
+)]
+#[ApiFilter(SearchFilter::class, properties: ['resourceNode.parent' => 'exact'])]
 #[ORM\Table(name: 'c_group_info')]
 #[ORM\Entity(repositoryClass: CGroupRepository::class)]
 class CGroup extends AbstractResource implements ResourceInterface, Stringable
@@ -42,11 +66,13 @@ class CGroup extends AbstractResource implements ResourceInterface, Stringable
     protected string $title;
     #[Assert\NotNull]
     #[ORM\Column(name: 'status', type: 'boolean', nullable: false)]
+    #[Groups(['group:read', 'group:write'])]
     protected bool $status;
     #[ORM\ManyToOne(targetEntity: CGroupCategory::class, cascade: ['persist'])]
     #[ORM\JoinColumn(name: 'category_id', referencedColumnName: 'iid', onDelete: 'CASCADE')]
     protected ?CGroupCategory $category = null;
     #[ORM\Column(name: 'description', type: 'text', nullable: true)]
+    #[Groups(['group:read', 'group:write'])]
     protected ?string $description = null;
     #[Assert\NotBlank]
     #[ORM\Column(name: 'max_student', type: 'integer')]
diff --git a/src/CourseBundle/Repository/CAttendanceCalendarRelGroupRepository.php b/src/CourseBundle/Repository/CAttendanceCalendarRelGroupRepository.php
new file mode 100644
index 0000000000..cfa2348f7a
--- /dev/null
+++ b/src/CourseBundle/Repository/CAttendanceCalendarRelGroupRepository.php
@@ -0,0 +1,42 @@
+<?php
+
+/* For licensing terms, see /license.txt */
+
+declare(strict_types=1);
+
+namespace Chamilo\CourseBundle\Repository;
+
+use Chamilo\CoreBundle\Repository\ResourceRepository;
+use Chamilo\CourseBundle\Entity\CAttendanceCalendar;
+use Chamilo\CourseBundle\Entity\CAttendanceCalendarRelGroup;
+use Chamilo\CourseBundle\Entity\CGroup;
+use Doctrine\Persistence\ManagerRegistry;
+
+class CAttendanceCalendarRelGroupRepository extends ResourceRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, CAttendanceCalendarRelGroup::class);
+    }
+
+    /**
+     * Add a group relation to a calendar entry.
+     */
+    public function addGroupToCalendar(int $calendarId, int $groupId): void
+    {
+        $em = $this->getEntityManager();
+        $existingRelation = $this->findOneBy([
+            'attendanceCalendar' => $calendarId,
+            'group' => $groupId,
+        ]);
+
+        if (!$existingRelation) {
+            $relation = new CAttendanceCalendarRelGroup();
+            $relation->setAttendanceCalendar($em->getReference(CAttendanceCalendar::class, $calendarId));
+            $relation->setGroup($em->getReference(CGroup::class, $groupId));
+
+            $em->persist($relation);
+            $em->flush();
+        }
+    }
+}
diff --git a/src/CourseBundle/Repository/CAttendanceCalendarRepository.php b/src/CourseBundle/Repository/CAttendanceCalendarRepository.php
new file mode 100644
index 0000000000..1f48aba69c
--- /dev/null
+++ b/src/CourseBundle/Repository/CAttendanceCalendarRepository.php
@@ -0,0 +1,184 @@
+<?php
+
+declare(strict_types=1);
+
+/* For licensing terms, see /license.txt */
+
+namespace Chamilo\CourseBundle\Repository;
+
+use Chamilo\CoreBundle\Repository\ResourceRepository;
+use Chamilo\CourseBundle\Entity\CAttendanceCalendar;
+use Chamilo\CourseBundle\Entity\CAttendanceSheet;
+use Doctrine\Persistence\ManagerRegistry;
+
+final class CAttendanceCalendarRepository extends ResourceRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, CAttendanceCalendar::class);
+    }
+
+    /**
+     * Retrieves all calendar events for a specific attendance.
+     *
+     * @param int $attendanceId
+     * @return CAttendanceCalendar[]
+     */
+    public function findByAttendanceId(int $attendanceId): array
+    {
+        return $this->createQueryBuilder('c')
+            ->where('c.attendance = :attendanceId')
+            ->setParameter('attendanceId', $attendanceId)
+            ->orderBy('c.dateTime', 'ASC')
+            ->getQuery()
+            ->getResult();
+    }
+
+    /**
+     * Deletes all calendar events associated with a specific attendance.
+     *
+     * @param int $attendanceId
+     * @return int The number of deleted records
+     */
+    public function deleteAllByAttendance(int $attendanceId): int
+    {
+        return $this->createQueryBuilder('c')
+            ->delete()
+            ->where('c.attendance = :attendanceId')
+            ->setParameter('attendanceId', $attendanceId)
+            ->getQuery()
+            ->execute();
+    }
+
+    /**
+     * Finds a specific calendar event by its ID and the associated attendance ID.
+     *
+     * @param int $calendarId
+     * @param int $attendanceId
+     * @return CAttendanceCalendar|null
+     */
+    public function findByIdAndAttendance(int $calendarId, int $attendanceId): ?CAttendanceCalendar
+    {
+        return $this->createQueryBuilder('c')
+            ->where('c.id = :calendarId')
+            ->andWhere('c.attendance = :attendanceId')
+            ->setParameters([
+                'calendarId' => $calendarId,
+                'attendanceId' => $attendanceId,
+            ])
+            ->getQuery()
+            ->getOneOrNullResult();
+    }
+
+    /**
+     * Retrieves calendar events filtered by a date range.
+     *
+     * @param int $attendanceId
+     * @param \DateTime|null $startDate
+     * @param \DateTime|null $endDate
+     * @return CAttendanceCalendar[]
+     */
+    public function findByDateRange(
+        int $attendanceId,
+        ?\DateTime $startDate,
+        ?\DateTime $endDate
+    ): array {
+        $qb = $this->createQueryBuilder('c')
+            ->where('c.attendance = :attendanceId')
+            ->setParameter('attendanceId', $attendanceId);
+
+        if ($startDate) {
+            $qb->andWhere('c.dateTime >= :startDate')
+                ->setParameter('startDate', $startDate);
+        }
+
+        if ($endDate) {
+            $qb->andWhere('c.dateTime <= :endDate')
+                ->setParameter('endDate', $endDate);
+        }
+
+        return $qb->orderBy('c.dateTime', 'ASC')
+            ->getQuery()
+            ->getResult();
+    }
+
+    /**
+     * Checks if a calendar event is blocked.
+     *
+     * @param int $calendarId
+     * @return bool
+     */
+    public function isBlocked(int $calendarId): bool
+    {
+        return (bool) $this->createQueryBuilder('c')
+            ->select('c.blocked')
+            ->where('c.id = :calendarId')
+            ->setParameter('calendarId', $calendarId)
+            ->getQuery()
+            ->getSingleScalarResult();
+    }
+
+    public function findAttendanceWithData(int $attendanceId): array
+    {
+        $calendars = $this->createQueryBuilder('calendar')
+            ->andWhere('calendar.attendance = :attendanceId')
+            ->setParameter('attendanceId', $attendanceId)
+            ->orderBy('calendar.dateTime', 'ASC')
+            ->getQuery()
+            ->getResult();
+
+        $attendanceDates = array_map(function (CAttendanceCalendar $calendar) {
+            return [
+                'id' => $calendar->getIid(),
+                'label' => $calendar->getDateTime()->format('M d, Y - h:i A'),
+            ];
+        }, $calendars);
+
+        $attendanceData = [];
+        foreach ($calendars as $calendar) {
+            /* @var CAttendanceSheet $sheet */
+            foreach ($calendar->getSheets() as $sheet) {
+                $key = $sheet->getUser()->getId() . '-' . $calendar->getIid();
+                $attendanceData[$key] = (int) $sheet->getPresence(); // Status: 1 (Present), 0 (Absent), null (No Status)
+            }
+        }
+
+        return [
+            'attendanceDates' => $attendanceDates,
+            'attendanceData' => $attendanceData,
+        ];
+    }
+
+    public function countByAttendanceAndGroup(int $attendanceId, ?int $groupId = null): int
+    {
+        $qb = $this->createQueryBuilder('calendar')
+            ->select('COUNT(calendar.iid)')
+            ->where('calendar.attendance = :attendanceId')
+            ->setParameter('attendanceId', $attendanceId);
+
+        if ($groupId) {
+            $qb->join('calendar.groups', 'groups')
+                ->andWhere('groups.group = :groupId')
+                ->setParameter('groupId', $groupId);
+        }
+
+        return (int) $qb->getQuery()->getSingleScalarResult();
+    }
+
+    public function countDoneAttendanceByAttendanceAndGroup(int $attendanceId, ?int $groupId = null): int
+    {
+        $qb = $this->createQueryBuilder('calendar')
+            ->select('COUNT(calendar.iid)')
+            ->where('calendar.attendance = :attendanceId')
+            ->andWhere('calendar.doneAttendance = true')
+            ->setParameter('attendanceId', $attendanceId);
+
+        if ($groupId) {
+            $qb->join('calendar.groups', 'groups')
+                ->andWhere('groups.group = :groupId')
+                ->setParameter('groupId', $groupId);
+        }
+
+        return (int) $qb->getQuery()->getSingleScalarResult();
+    }
+}
diff --git a/src/CourseBundle/Repository/CAttendanceSheetRepository.php b/src/CourseBundle/Repository/CAttendanceSheetRepository.php
new file mode 100644
index 0000000000..805dfbd9da
--- /dev/null
+++ b/src/CourseBundle/Repository/CAttendanceSheetRepository.php
@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+/* For licensing terms, see /license.txt */
+
+namespace Chamilo\CourseBundle\Repository;
+
+use Chamilo\CoreBundle\Repository\ResourceRepository;
+use Chamilo\CourseBundle\Entity\CAttendanceSheet;
+use Doctrine\Persistence\ManagerRegistry;
+
+final class CAttendanceSheetRepository extends ResourceRepository
+{
+    public function __construct(ManagerRegistry $registry)
+    {
+        parent::__construct($registry, CAttendanceSheet::class);
+    }
+
+    public function getUserScore(int $userId, int $attendanceId, ?int $groupId = null): int
+    {
+        $qb = $this->createQueryBuilder('sheet')
+            ->select('SUM(sheet.presence) as score')
+            ->join('sheet.attendanceCalendar', 'calendar')
+            ->where('calendar.attendance = :attendanceId')
+            ->andWhere('sheet.user = :userId')
+            ->setParameter('attendanceId', $attendanceId)
+            ->setParameter('userId', $userId);
+
+        if ($groupId) {
+            $qb->join('calendar.groups', 'groups')
+                ->andWhere('groups.group = :groupId')
+                ->setParameter('groupId', $groupId);
+        }
+
+        return (int) $qb->getQuery()->getSingleScalarResult();
+    }
+}