<?php
/* For licensing terms, see /license.txt */

/**
 * Class SequenceManager
 */
class SequenceManager
{
    const _debug = false;

    /**
     * @param $row_entity_id
     * @return array|bool
     */
    public static function get_pre_req_id_by_row_entity_id($row_entity_id)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $row_entity_id = intval(Database::escape_string($row_entity_id));
        if ($row_entity_id > 0) {
            $seq_table = Database::get_main_table(TABLE_MAIN_SEQUENCE);
            $sql = "SELECT sequence_row_entity_id FROM $seq_table
                    WHERE sequence_row_entity_id_next = $row_entity_id";
            $result = Database::query($sql);
            if (Database::num_rows($result) > 0) {
                while ($temp_pre_req = Database::fetch_array($result, 'ASSOC')){
                    $pre_req[] = intval($temp_pre_req['sequence_row_entity_id']);
                }
                return $pre_req;
            }
        }
        return false;
    }

    /**
     * @param int $entity_id
     * @param int $row_entity_id
     * @param int $course_id
     * @return array|bool
     */
    public static function get_next_by_row_id($entity_id, $row_entity_id, $course_id = null)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $row_entity_id = Database::escape_string($row_entity_id);
        $entity_id = Database::escape_string($entity_id);
        $course_id = Database::escape_string($course_id);

        if (is_numeric($row_entity_id) && is_numeric($entity_id)) {
            $row_entity_id = intval($row_entity_id);
            $entity_id = intval($entity_id);
            $course_id = is_numeric($course_id) ? intval($course_id) : api_get_course_int_id();

            $seq_table = Database::get_main_table(TABLE_MAIN_SEQUENCE);
            $row_table = Database::get_main_table(TABLE_SEQUENCE_ROW_ENTITY);
            $sql = "SELECT row.id FROM $row_table row
                    WHERE
                        row.sequence_type_entity_id = $entity_id AND
                         row.row_id = $row_entity_id AND
                         row.c_id = $course_id LIMIT 0, 1";
            $sql = "SELECT main.sequence_row_entity_id_next
                    FROM $seq_table main WHERE main.sequence_row_entity_id_next IN ($sql)";
            $sql = "SELECT * FROM $row_table res
                    WHERE res.id IN ($sql)";
            $result = Database::query($sql);
            if (Database::num_rows($result) > 0) {
                while ($temp_next = Database::fetch_array($result, 'ASSOC')){
                    $next[] = $temp_next;
                }
                return $next;
            }
        }

        return false;
    }

    /**
     * @param int $entity_id
     * @return array|bool
     */
    public static function get_entity_by_id($entity_id)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $entity_id = Database::escape_string($entity_id);
        if (is_numeric($entity_id)) {
            $entity_id = intval($entity_id);
            $ety_table = Database::get_main_table(TABLE_SEQUENCE_TYPE_ENTITY);
            $sql = "SELECT * FROM $ety_table WHERE id = $entity_id LIMIT 0, 1";
            $result = Database::query($sql);
            if (Database::num_rows($result) > 0) {
                while ($temp_entity = Database::fetch_array($result, 'ASSOC')){
                    $entity[] = $temp_entity;
                }
                return $entity;
            }
        }
        return false;
    }

    /**
     * @param int $row_entity_id
     * @param int $user_id
     * @param int $session_id
     * @param int $rule_id
     * @return bool
     */
    public static function validate_rule_by_row_id($row_entity_id, $user_id = null, $session_id, $rule_id = 1)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $condition = self::get_condition_by_rule_id($rule_id);
        if ($condition !== false) {
            $con = $condition[0];
            while(isset($con)) {
                $var = self::get_variable_by_condition_id($con['id']);
                $val = self::get_value_by_user_id($row_entity_id, $user_id, $session_id, 1);
                $statement = 'return ('.floatval($val[0][$var[0]["name"]]).' '.$con["mat_op"].' '.$con["param"].');';
                if (eval($statement)) {
                    $go = (!isset($con['act_true']))? -1 : intval($con['act_true']);
                } else {
                    $go = (!isset($con['act_false']))? -1 : intval($con['act_false']);
                }
                if ($go === 0) {
                    return true;
                } else {
                    --$go;
                    $con = isset($condition[$go]) ? $condition[$go] : null;
                }
            }
        }
        return false;
    }

    /**
     * @param int $rule_id
     * @return array|bool
     */
    public static function get_condition_by_rule_id($rule_id = 1)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $rule_id = Database::escape_string($rule_id);
        if (is_numeric($rule_id)) {
            $rule_id = intval($rule_id);
            $con_table = Database::get_main_table(TABLE_SEQUENCE_CONDITION);
            $rul_con_table = Database::get_main_table(TABLE_SEQUENCE_RULE_CONDITION);
            $sql = "SELECT rc.sequence_condition_id FROM $rul_con_table rc WHERE rc.sequence_rule_id = $rule_id";
            $sql = "SELECT * FROM $con_table co WHERE co.id IN ($sql)";
            $result = Database::query($sql);
            if (Database::num_rows($result) > 0) {
                while ($temp_condition = Database::fetch_array($result, 'ASSOC')) {
                    $condition[] = $temp_condition;
                }
                return $condition;
            }
        }
        return false;
    }

    /**
     * @param int $rule_id
     * @return array|bool
     */
    public static function get_method_by_rule_id($rule_id = 1)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $rule_id = Database::escape_string($rule_id);
        if (is_numeric($rule_id)) {
            $rule_id = intval($rule_id);
            $met_table = Database::get_main_table(TABLE_SEQUENCE_METHOD);
            $rul_met_table = Database::get_main_table(TABLE_SEQUENCE_RULE_METHOD);
            $sql = "SELECT rm.sequence_method_id
                    FROM $rul_met_table rm
                    WHERE rc.sequence_rule_id = $rule_id";
            $sql = "SELECT * FROM $met_table co
                    WHERE co.id IN ($sql)";
            $result = Database::query($sql);
            if (Database::num_rows($result) > 0) {
                while ($temp_method = Database::fetch_array($result, 'ASSOC')){
                    $method[] = $temp_method;
                }
                return $method;
            }
        }

        return false;
    }

    /**
     * @param int $row_entity_id
     * @return array|bool
     */
    public static function get_value_by_row_entity_id($row_entity_id)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $row_entity_id = intval(Database::escape_string($row_entity_id));
        if ($row_entity_id > 0) {
            $val_table = Database::get_main_table(TABLE_SEQUENCE_VALUE);
            $sql = "SELECT * FROM $val_table val
                    WHERE val.sequence_row_entity_id = $row_entity_id";
            $result = Database::query($sql);
            if (Database::num_rows($result) > 0) {
                while ($temp_value = Database::fetch_array($result, 'ASSOC')){
                    $value[] = $temp_value;
                }
                return $value;
            }
        }
        return false;
    }

    /**
     * @param int $condition_id
     * @return array|bool
     */
    public static function get_variable_by_condition_id($condition_id)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $condition_id = Database::escape_string($condition_id);
        if (is_numeric($condition_id)) {
            $condition_id = intval($condition_id);
            $var_table = Database::get_main_table(TABLE_SEQUENCE_VARIABLE);
            $vld_table = Database::get_main_table(TABLE_SEQUENCE_VALID);
            $sql = "SELECT DISTINCT vld.sequence_variable_id
                    FROM $vld_table vld
                    WHERE vld.sequence_condition_id = $condition_id";
            $sql = "SELECT * FROM $var_table var WHERE var.id IN ($sql)";
            $result = Database::query($sql);
            if (Database::num_rows($result) > 0) {
                while ($temp_variable = Database::fetch_array($result, 'ASSOC')) {
                    $variable[] = $temp_variable;
                }
                return $variable;
            }
        }
        return false;
    }

    /**
     * @param int $row_entity_id
     * @param int $user_id
     * @param $session_id
     * @param string $met_type
     * @param int $available
     * @param int $complete_items
     * @param int $total_items
     * @param null $available_end_date
     * @return bool
     */
    public static function execute_formulas_by_user_id(
        $row_entity_id = null,
        $user_id = null,
        $session_id,
        $met_type = '',
        $available = 1,
        $complete_items = 1,
        $total_items = 1,
        $available_end_date = null
    ) {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $value = self::get_value_by_user_id($row_entity_id, $user_id, $session_id, $available);
        if ($value !== false) {
            if (empty($met_type)) {
                $met_filter = " AND met.met_type NOT IN ('success', 'pre', 'update') ";
            } else {
                $met_filter = " AND met.met_type = '$met_type' ";
            }
            $val_table = Database::get_main_table(TABLE_SEQUENCE_VALUE);
            $rul_table = Database::get_main_table(TABLE_SEQUENCE_RULE);
            $rul_met_table = Database::get_main_table(TABLE_SEQUENCE_RULE_METHOD);
            $met_table = Database::get_main_table(TABLE_SEQUENCE_METHOD);
            $var_table = Database::get_main_table(TABLE_SEQUENCE_VARIABLE);
            $sql = "SELECT var.id, var.name FROM $var_table var";
            $result = Database::query($sql);
            $variable = [];
            while ($temp_var = Database::fetch_row($result)) {
                $variable[$temp_var['0']] = $temp_var['1'];
            }
            $sql = "SELECT rul.id FROM $rul_table rul";
            $sql = "SELECT met.formula, met.assign assign
                    FROM $met_table met, $rul_met_table rm
                    WHERE
                        met.id = rm.sequence_method_id $met_filter
                    ORDER BY rm.method_order";
            $result = Database::query($sql);
            while ($temp_fml = Database::fetch_array($result, 'ASSOC')) {
                $formula[] = $temp_fml;
            }
            $pat = "/v#(\d+)/";
            if (isset($formula) && isset($variable)) {
                if (is_array($value[0])) {
                    $rep = '$val[$variable[$1]]';
                    foreach ($value as $val) {
                        $sql_array = array(
                            'UPDATE' => " $val_table SET "
                        );
                        foreach ($formula as $fml) {
                            $assign_key = $variable[$fml['assign']];
                            $assign_val = &$val[$variable[$fml['assign']]];
                            $fml_exe = preg_replace($pat, $rep, $fml['formula']);
                            $fml_exe = 'return '.$fml_exe;
                            $assign_val = eval($fml_exe);
                            $sql_array[$assign_key] = " = '$assign_val', ";
                        }
                        $sql_array['WHERE'] = ' id = '.$val['id'];
                        $sql = '';
                        foreach ($sql_array as $sql_key => $sql_val) {
                            $sql .= $sql_key;
                            $sql .= $sql_val;
                        }
                        $sql = preg_replace('/, WHERE/', ' WHERE', $sql);
                        $result = Database::query($sql);
                    }
                }

                return true;
            }
        }

        return false;
    }

    /**
     * @param int $row_entity_id
     * @param int $user_id
     * @param int $session_id
     * @param int $available
     * @param int $success
     * @return array|bool
     */
    public static function get_value_by_user_id(
        $row_entity_id = null,
        $user_id = null,
        $session_id = null,
        $available = -1,
        $success = -1
    ) {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $user_id = (isset($user_id))? intval(Database::escape_string($user_id)) : api_get_user_id();
        if ($user_id > 0) {
            $available = Database::escape_string($available);
            $available = (is_numeric($available))? intval($available) : -1;
            if ($available < 0) {
                $available_filter = '';
            } else {
                $available_filter = " AND available = $available ";
            }
            $success = Database::escape_string($success);
            $success = (is_numeric($success))? intval($success) : -1;
            if ($success < 0) {
                $success_filter = '';
            } else {
                $success_filter = " AND success = $success ";
            }
            $row_entity_id = Database::escape_string($row_entity_id);
            $row_entity_id = (is_numeric($row_entity_id))? intval($row_entity_id) : 0;
            if ($row_entity_id !== 0) {
                $row_entity_filter = " AND sequence_row_entity_id = $row_entity_id ";
            } else {
                $row_entity_filter = '';
            }
            $session_id = Database::escape_string($session_id);
            $session_id = (is_numeric($session_id))? intval($session_id) : -1;
            if ($session_id < 0) {
                $session_filter = '';
            } else {
                $session_filter = " AND session_id = $session_id ";
            }
            $val_table = Database::get_main_table(TABLE_SEQUENCE_VALUE);
            $sql = "SELECT * FROM $val_table
                    WHERE user_id = $user_id $available_filter $success_filter $row_entity_filter $session_filter";
            $result = Database::query($sql);
            if (Database::num_rows($result) > 0) {
                while($temp_value = Database::fetch_array($result,'ASSOC')){
                    $value[] = $temp_value;
                }

                return $value;
            }
        }

        return false;
    }

    /**
     * @param $formula
     * @return array|bool
     */
    public static function find_variables_in_formula($formula)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $formula = Database::escape_string($formula);
        if (isset($formula)) {
            $pat = "/v#(\d+)/";
            preg_match_all($pat, $formula, $v_array);
            if (isset($v_array)){
                $var_array = array_unique($v_array[1]);
                sort($var_array);
                return $var_array;
            }
        }

        return false;
    }

    /**
     * @param int $row_entity_id
     * @return array|bool
     */
    public static function get_user_id_by_row_entity_id($row_entity_id = 0)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $row_entity_id = intval(Database::escape_string($row_entity_id));
        if ($row_entity_id > 0) {
            $row_entity_filter = "WHERE sequence_row_entity_id = $row_entity_id";
        } else {
            $row_entity_filter = '';
        }
        $val_table = Database::get_main_table(TABLE_SEQUENCE_VALUE);
        $sql = "SELECT DISTINCT user_id, session_id FROM $val_table $row_entity_filter";
        $result = Database::query($sql);
        if (Database::num_rows($result) > 0) {
            while ($temp_user = Database::fetch_array($result, 'ASSOC')) {
                $user[] = $temp_user;
            }
            return $user;
        }
        return false;
    }

    /**
     * @param $row_entity_id
     * @param $user_id
     * @param $session_id
     * @param null $available_end_date
     * @return bool
     */
    public static function action_pre_init(
        $row_entity_id,
        $user_id,
        $session_id,
        $available_end_date = null
    ) {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $user_id = intval(Database::escape_string($user_id));
        $session_id = intval(Database::escape_string($session_id));
        $row_entity_id = intval(Database::escape_string($row_entity_id));
        $seq_table = Database::get_main_table(TABLE_MAIN_SEQUENCE);
        $val_table = Database::get_main_table(TABLE_SEQUENCE_VALUE);
        $sql = "SELECT DISTINCT seq.sequence_row_entity_id, val.user_id
                FROM $seq_table seq, $val_table val
                WHERE
                    seq.is_part != 1
                    AND val.success = 0
                    AND val.user_id = $user_id
                    AND val.session_id = $session_id
                    AND val.sequence_row_entity_id = seq.sequence_row_entity_id
                    AND seq.sequence_row_entity_id_next = $row_entity_id";
        $result = Database::query($sql);
        while ($temp = Database::fetch_array($result, 'ASSOC')){
            $pre_req[$temp['user_id']] = $temp['sequence_row_entity_id'];
        }
        if (empty($pre_req)) {
            if (self::get_value_by_user_id($row_entity_id, $user_id, $session_id) === false) {
                self::temp_hack_4_insert(1, $row_entity_id, $user_id, 0, $session_id);
            }
            self::execute_formulas_by_user_id(
                $row_entity_id,
                $user_id,
                $session_id,
                'pre',
                0,
                null,
                null,
                $available_end_date
            );
            return true;
        } else {
            self::temp_hack_4_set_aval($row_entity_id, $user_id, $session_id, 0);
        }

        return false;
    }

    /**
     * @param int $row_entity_id
     * @param int $user_id
     * @param $session_id
     * @param null $available_end_date
     */
    public static function action_post_success_by_user_id($row_entity_id, $user_id, $session_id, $available_end_date = null)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        if (self::execute_formulas_by_user_id($row_entity_id, $user_id, $session_id, 'success', 1, null, null, null)) {
            $seq_table = Database::get_main_table(TABLE_MAIN_SEQUENCE);
            $value = self::get_value_by_user_id($row_entity_id, $user_id, $session_id, 1, 1);
            //$check_array = []; Update later
            foreach ($value as $val) {
                $row_entity_id_prev = $val['sequence_row_entity_id'];
                $sql = "SELECT seq.sequence_row_entity_id_next
                        FROM $seq_table seq
                        WHERE seq.sequence_row_entity_id = $row_entity_id_prev";
                $result = Database::query($sql);
                while ($temp_next = Database::fetch_array($result, 'ASSOC')) {
                    $next[] = $temp_next['sequence_row_entity_id_next'];
                }
                foreach ($next as $nx) {
                    self::action_pre_init($nx, $user_id, $session_id, $available_end_date);
                }
            }
        }
    }

    /**
     * @param int $entity_id
     * @param int $row_id
     * @param int $c_id
     */
    public static function getAllRowEntityIdByRowId($entity_id, $row_id, $c_id)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $row_id = intval(Database::escape_string($row_id));
        $entity_id = intval(Database::escape_string($entity_id));
        $c_id = intval(Database::escape_string($c_id));

        $row_entity_id_prev = self::get_row_entity_id_by_row_id($entity_id, $row_id, $c_id);

        if ($row_id > 0 && $entity_id > 0 && $c_id > 0) {
            $table = Database::get_main_table(TABLE_MAIN_SEQUENCE);
            $tableRow = Database::get_main_table(TABLE_SEQUENCE_ROW_ENTITY);
            $sql = "SELECT DISTINCT r.* FROM $table s
                    INNER JOIN $tableRow r
                    ON (r.id = s.sequence_row_entity_id)
                    WHERE sequence_row_entity_id_next = $row_entity_id_prev";

            $result = Database::query($sql);
            if (Database::num_rows($result) > 0) {
                $row_entity = array();
                while ($temp_row_entity = Database::fetch_array($result, 'ASSOC')) {
                    $row_entity[] = $temp_row_entity;
                }
                return $row_entity;
            }
        }

        return array();
    }

    /**
     * @param int $entity_id
     * @param int $row_id
     * @param int $c_id
     * @return array
     */
    public static function getRowEntityByRowId($entity_id, $row_id, $c_id)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $row_id = intval(Database::escape_string($row_id));
        $entity_id = intval(Database::escape_string($entity_id));
        $c_id = intval(Database::escape_string($c_id));
        if ($row_id > 0 && $entity_id > 0 && $c_id > 0) {
            $row_table = Database::get_main_table(TABLE_SEQUENCE_ROW_ENTITY);
            $sql = "SELECT row.*
                    FROM $row_table row
                    WHERE
                        row.sequence_type_entity_id = $entity_id AND
                        row.row_id = $row_id AND
                        row.c_id = $c_id LIMIT 0, 1";
            $result = Database::query($sql);
            if (Database::num_rows($result) > 0) {

                return Database::fetch_array($result, 'ASSOC');
            }
        }

        return array();
    }

    /**
     * @param int $row_entity_id
     * @param int $user_id
     * @param int $session_id
     * @return mixed
     */
    public static function getValIdByRowEntityId($row_entity_id, $user_id, $session_id)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $row_entity_id = intval(Database::escape_string($row_entity_id));
        $user_id = intval(Database::escape_string($user_id));
        $session_id = intval(Database::escape_string($session_id));

        if ($row_entity_id > 0 && $user_id > 0 && $session_id >= 0) {
            $val_table = Database::get_main_table(TABLE_SEQUENCE_VALUE);
            $seq_table = Database::get_main_table(TABLE_MAIN_SEQUENCE);

            //check if exists value row
            $sql = "SELECT val.id FROM $val_table val
                    WHERE
                        val.sequence_row_entity_id = $row_entity_id
                        AND val.user_id = $user_id
                        AND val.session_id = $session_id
                    LIMIT 0, 1";

            $result = Database::query($sql);

            if (Database::num_rows($result) > 0) {
                $temp_row_entity = Database::fetch_array($result, 'ASSOC');
                return $temp_row_entity['id'];
            } else {
                $sql = "SELECT sequence_row_entity_id FROM $seq_table
                        WHERE sequence_row_entity_id_next = $row_entity_id";
                $result = Database::query($sql);
                $available = 0;
                if (Database::num_rows($result)) {
                    while ($temp_row_entity = Database::fetch_row($result)) {
                        if ($temp_row_entity[0] == 0) {
                            $available = 1;
                            break;
                        }
                    }
                    //Val row starts not available
                } else {
                    //Val row starts available
                    $available = 1;
                }
                return self::temp_hack_4_insert(1, $row_entity_id, $user_id, $available, $session_id);
            }
        }
        return 0;
    }

    /**
     * @param int $entity_id
     * @param int $row_id
     * @param int $c_id
     * @param string $name
     * @return int
     */
    public static function get_row_entity_id_by_row_id($entity_id, $row_id, $c_id, $name = '')
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
            error_log('......................................');
            error_log('entity_id: '.$entity_id.'.............');
            error_log('row_id: '.$row_id.'...................');
            error_log('c_id: '.$c_id.'.......................');
        }
        $row_id = intval(Database::escape_string($row_id));
        $entity_id = intval(Database::escape_string($entity_id));
        $c_id = intval(Database::escape_string($c_id));
        $name = Database::escape_string($name);
        if ($row_id > 0 && $entity_id > 0 && $c_id > 0) {
            $row_table = Database::get_main_table(TABLE_SEQUENCE_ROW_ENTITY);
            $clp_table = Database::get_course_table(TABLE_LP_MAIN);
            $sql = "SELECT row.id
                    FROM $row_table row
                    WHERE
                        row.sequence_type_entity_id = $entity_id AND
                        row.row_id = $row_id AND
                        row.c_id = $c_id
                    LIMIT 0, 1";
            $result = Database::query($sql);
            if (Database::num_rows($result) > 0) {
                while ($temp_row_entity = Database::fetch_array($result, 'ASSOC')) {
                    $row_entity[] = $temp_row_entity;
                }
                if (self::_debug) {
                    error_log('Return in '.__FUNCTION__.' in '.__FILE__);
                    error_log('...............................'.$row_entity[0]['id']);
                }
                return $row_entity[0]['id'];
            } elseif ($entity_id == 1) {
                $sql = "SELECT name, prerequisite FROM $clp_table
                        WHERE c_id = $c_id
                        AND id = $row_id
                        LIMIT 0, 1";
                $result = Database::query($sql);
                if (Database::num_rows($result) > 0) {
                    $temp_arr = Database::fetch_array($result, 'ASSOC');
                    $name = $temp_arr['name'];
                    $name = Database::escape_string($name);
                    $pre = ($temp_arr['prerequisite'] > 0)? self::get_row_entity_id_by_row_id($entity_id, $temp_arr['prerequisite'], $c_id) : 0 ;
                    $sql = "INSERT INTO $row_table (sequence_type_entity_id, c_id, row_id, name)
                            VALUES ($entity_id, $c_id, $row_id, '$name')";
                    Database::query($sql);
                    $id = Database::insert_id();
                    if ($id != 0) {
                        $seq_table = Database::get_main_table(TABLE_MAIN_SEQUENCE);
                        $sql = "INSERT INTO $seq_table (sequence_row_entity_id, sequence_row_entity_id_next, is_part) VALUES
                        ($pre, $id, 0)";
                        Database::query($sql);
                        if (self::_debug) {
                            error_log('Return in '.__FUNCTION__.' in '.__FILE__);
                            error_log('................................'.$id);
                        }
                        return $id;
                    } else {
                        if (self::_debug) {
                            error_log('Fail and Return in '.__FUNCTION__.' in '.__FILE__);
                            error_log('................................');
                            error_log($sql);
                            error_log('................................');
                            error_log('......................................0');
                        }
                    }
                } else {
                    if (self::_debug) {
                        error_log('No result for query in '.__FUNCTION__.' in '.__FILE__);
                        error_log('................................');
                        error_log($sql);
                    }
                }
            } else {
                if (self::_debug) {
                    error_log('Fail and Return in '.__FUNCTION__.' in '.__FILE__);
                    error_log('................................');
                    error_log($sql);
                    error_log('................................');
                    error_log('......................................0');
                }
            }
        }
        if (self::_debug) {
            error_log('Fail and Return in '.__FUNCTION__.' in '.__FILE__);
            error_log('......................................');
            error_log('entity_id: '.$entity_id.'.............');
            error_log('row_id: '.$row_id.'...................');
            error_log('c_id: '.$c_id.'.......................');
            error_log('......................................0');
        }
        return 0;
    }

    /**
     * @param $entity_id
     * @param $row_id
     * @param $c_id
     * @param $session_id
     * @param $user_id
     * @param $rule_id
     * @param int $items_completed
     * @param int $total_items
     * @param null $available_end_date
     */
    public static function temp_hack_4_update($entity_id, $row_id, $c_id, $session_id, $user_id, $rule_id, $items_completed = 1, $total_items = 1, $available_end_date =null )
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $row_entity_id = self::get_row_entity_id_by_row_id($entity_id, $row_id, $c_id);
        if (!empty($row_entity_id)) {
            self::execute_formulas_by_user_id($row_entity_id, $user_id, $session_id, 'update', 1, $items_completed, $total_items);
            if (self::validate_rule_by_row_id($row_entity_id, $user_id, $session_id, $rule_id) && (self::get_value_by_user_id($row_entity_id, $user_id, $session_id, 1, 1) === false)) {
                self::action_post_success_by_user_id($row_entity_id, $user_id, $session_id, $available_end_date);
            }
        }
    }

    /**
     * @param $entity_name
     * @return bool
     */
    public static function get_table_by_entity_name($entity_name)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $entity_name = Database::escape_string($entity_name);
        $ety_table = Database::get_main_table(TABLE_SEQUENCE_TYPE_ENTITY);
        $sql = "SELECT ety.ent_table
                FROM $ety_table ety
                WHERE ety.name = $entity_name LIMIT 0, 1";
        $result = Database::query($sql);
        if (Database::num_rows($result) > 0) {
            while ($temp_entity = Database::fetch_array($result, 'ASSOC')) {
                $entity[] = $temp_entity;
            }
            return $entity[0]['ent_table'];
        }

        return false;
    }

    /**
     * @param $entity_name
     * @return array|bool
     */
    public static function get_entity_by_entity_name($entity_name)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $entity_name = Database::escape_string($entity_name);
        $ety_table = Database::get_main_table(TABLE_SEQUENCE_TYPE_ENTITY);
        $sql = "SELECT ety.* FROM $ety_table ety WHERE ety.name = $entity_name LIMIT 0, 1";
        $result = Database::query($sql);
        if (Database::num_rows($result) > 0) {
            while ($temp_entity = Database::fetch_array($result,'ASSOC')) {
                $entity[] = $temp_entity;
            }
            return $entity;
        }
        return false;
    }

    /**
     * @param $entity_id
     * @param $row_id
     * @param $c_id
     * @param string $name
     * @return bool|string
     */
    public static function temp_hack_2_insert($entity_id, $row_id, $c_id, $name = '')
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $row_id = intval(Database::escape_string($row_id));
        $c_id = intval(Database::escape_string($c_id));
        $entity_id = intval(Database::escape_string($entity_id));
        $name = Database::escape_string($name);

        if ($entity_id > 0 && $row_id > 0 && $c_id >0) {
            $row_table = Database::get_main_table(TABLE_SEQUENCE_ROW_ENTITY);
            $sql = "INSERT INTO $row_table (sequence_type_entity_id, c_id, row_id, name) VALUES
            ($entity_id, $c_id, $row_id, '$name')";
            Database::query($sql);
            if (Database::affected_rows() > 0) {
                return Database::insert_id();
            }
        }
        return false;
    }

    /**
     * @param $entity_id_prev
     * @param $entity_id_next
     * @param int $row_id_prev
     * @param int $row_id_next
     * @param int $c_id
     * @param int $is_part
     * @return bool|string
     */
    public static function temp_hack_3_insert($entity_id_prev, $entity_id_next, $row_id_prev = 0, $row_id_next = 0, $c_id = 1, $is_part = 0)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $is_part = intval(Database::escape_string($is_part));
        $seq_table = Database::get_main_table(TABLE_MAIN_SEQUENCE);
        $prev = self::get_row_entity_id_by_row_id($entity_id_prev, $row_id_prev, $c_id);
        $next = self::get_row_entity_id_by_row_id($entity_id_next, $row_id_next, $c_id);
        if ($prev != 0 || $next != 0) {
            $sql = "INSERT INTO  $seq_table (sequence_row_entity_id, sequence_row_entity_id_next, is_part) VALUES
            ($prev, $next, $is_part)";
            Database::query($sql);
            if (Database::affected_rows() > 0) {
                return Database::insert_id();
            }
        }
        return false;
    }

    /**
     * @param $total_items
     * @param $row_entity_id
     * @param int $user_id
     * @param int $available
     * @param $session_id
     * @return string
     */
    public static function temp_hack_4_insert($total_items, $row_entity_id, $user_id = 0, $available = -1, $session_id)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $user_id = intval(Database::escape_string($user_id));
        $session_id = intval(Database::escape_string($session_id));
        $total_items = intval(Database::escape_string($total_items));
        $available = intval(Database::escape_string($available));

        if ($available === -1) {
            $pre_req = self::get_pre_req_id_by_row_entity_id($row_entity_id);
            foreach ($pre_req as $pr) {
                if($pr === 0) {
                    $available = 1;
                    break;
                }
            }
        }

        if (self::get_value_by_user_id($row_entity_id, $user_id, $session_id) === false) {
            $val_table = Database::get_main_table(TABLE_SEQUENCE_VALUE);
            $sql = "INSERT INTO $val_table (user_id, sequence_row_entity_id, total_items, available, session_id)
                    VALUES ($user_id, $row_entity_id, $total_items, $available, $session_id)";
            Database::query($sql);

            return Database::insert_id();
        }
    }

    /**
     * Cleans the sequence table by sequence_row_entity_id_next
     * @param int $id
     * @param int $c_id
     */

    public function cleanPrerequisites($id, $c_id)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $table = Database::get_main_table(TABLE_MAIN_SEQUENCE);
        $row_entity_id_next = self::get_row_entity_id_by_row_id(1, $id, $c_id);
        $sql = "DELETE FROM $table WHERE sequence_row_entity_id_next = $row_entity_id_next";
        Database::query($sql);
    }

    /**
     * @param $entity_id_prev
     * @param $entity_id_next
     * @param int $row_id_prev
     * @param int $row_id_next
     * @param int $c_id
     * @param int $user_id
     */
    public static function temp_hack_3_update(
        $entity_id_prev,
        $entity_id_next,
        $row_id_prev = 0,
        $row_id_next = 0,
        $c_id = 0,
        $user_id = 0
    ) {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $user_id = intval($user_id);

        $row_entity_id_prev = self::get_row_entity_id_by_row_id($entity_id_prev, $row_id_prev, $c_id);
        $row_entity_id_next = self::get_row_entity_id_by_row_id($entity_id_next, $row_id_next, $c_id);

        if ($row_entity_id_prev !== 0 || $row_entity_id_next !== 0) {
            $seq_table = Database::get_main_table(TABLE_MAIN_SEQUENCE);
            // Old code

            /*$sql = "UPDATE $seq_table SET sequence_row_entity_id = $row_entity_id_prev WHERE sequence_row_entity_id_next = $row_entity_id_next";
            Database::query($sql);*/

            // Check if exists.
            $sql = "SELECT count(*) as count FROM $seq_table
                    WHERE sequence_row_entity_id = $row_entity_id_prev AND sequence_row_entity_id_next = $row_entity_id_next";
            $result = Database::query($sql);
            $countRow = Database::fetch_array($result);
            $count = $countRow['count'];

            if (empty($count)) {
                // Insert
                $sql = "INSERT INTO $seq_table SET sequence_row_entity_id = $row_entity_id_prev, sequence_row_entity_id_next = $row_entity_id_next";
                Database::query($sql);
            } else {
                // Update.
                $data = self::getRowEntityByRowId($entity_id_next, $row_id_next, $c_id);
                $sql = "UPDATE $seq_table SET sequence_row_entity_id = $row_entity_id_prev
                       WHERE sequence_row_entity_id_next = $row_entity_id_next AND id = {$data['id']}";
                Database::query($sql);
            }

            if ($row_entity_id_prev === 0) {
                if ($user_id === 0) {
                    $user_id = self::get_user_id_by_row_entity_id($row_entity_id_next);
                    foreach ($user_id as $us_id) {
                        self::action_pre_init($row_entity_id_next, $us_id['user_id'], $us_id['session_id']);
                    }
                } else {
                    $sessions = self::get_sessions_by_user_id($user_id,$row_entity_id_next);
                    foreach ($sessions as $session) {
                        self::action_pre_init($row_entity_id_next, $user_id, $session);
                    }
                }
            } else {
                if ($user_id === 0) {
                    $user_id = self::get_user_id_by_row_entity_id($row_entity_id_prev);
                    foreach ($user_id as $us_id) {
                        self::action_pre_init($row_entity_id_next, $us_id['user_id'], $us_id['session_id'], 0);
                    }
                } else {
                    $sessions = self::get_sessions_by_user_id($user_id,$row_entity_id_next);
                    foreach ($sessions as $session) {
                        self::action_pre_init($row_entity_id_next, $user_id, $session['session_id']);
                    }
                }
            }
        }
    }

    public static function get_sessions_by_user_id ($user_id, $row_entity_id) {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $val_table = Database::get_main_table(TABLE_SEQUENCE_VALUE);
        $sessions = [];
        $sql = "SELECT session_id FROM $val_table
            WHERE user_id = $user_id
            AND row_entity_id = $row_entity_id";
        $res = Database::query($sql);
        while ($temp_array = Database::fetch_array($res, 'ASSOC')) {
            $sessions[] = $temp_array;
        }
        return $sessions;
    }

    public static function temp_hack_4_delete($entity_id, $row_id, $c_id) {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $row_entity_id = self::get_row_entity_id_by_row_id($entity_id, $row_id, $c_id);
        if ($row_entity_id !== false) {
            $val_table = Database::get_main_table(TABLE_SEQUENCE_VALUE);
            $sql = "DELETE FROM $val_table WHERE sequence_row_entity_id = $row_entity_id";
            $result = Database::query($sql);
            if (Database::affected_rows() > 0) {
                return Database::affected_rows();
            }
        }
        return false;
    }
    public static function temp_hack_3_delete($entity_id, $row_id, $c_id, $rule_id) {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $row_entity_id = self::get_row_entity_id_by_row_id($entity_id, $row_id, $c_id);
        $seq_array = array();
        if ($row_entity_id !== false) {
            $seq_table = Database::get_main_table(TABLE_MAIN_SEQUENCE);
            $sql = "SELECT * FROM $seq_table WHERE sequence_row_entity_id = $row_entity_id";
            $result = Database::query($sql);
            while ($temp_seq_array = Database::fetch_array($result, 'ASSOC')){
                $seq_array[] = $temp_seq_array;
            }
            if (is_array($seq_array)) {
                foreach ($seq_array as $seq) {
                    $sql = "SELECT id FROM $seq_table WHERE sequence_row_entity_id_next = ".$seq['sequence_row_entity_id_next'];
                    $result = Database::query($sql);
                    if (Database::num_rows($result) > 1){
                        $value = self::get_value_by_row_entity_id($seq['sequence_row_entity_id_next']);
                        foreach ($value as $val) {
                            if ($seq['is_part'] === 1) {
                                self::execute_formulas_by_user_id($seq['sequence_row_entity_id_next'], $val['user_id'], $val['session_id'], '', 1, 0, -1, null);
                            }
                            if (self::validate_rule_by_row_id($seq['sequence_row_entity_id_next'], $val['user_id'], $val['session_id'], $rule_id) && $val['success'] !== 1) {
                                self::action_post_success_by_user_id($seq['sequence_row_entity_id_next'], $val['user_id'], $val['session_id'], null);
                            }
                        }
                    } else {
                        $sql = "UPDATE $seq_table SET sequence_row_entity_id = 0 WHERE sequence_row_entity_id_next = ".$seq['sequence_row_entity_id_next'];
                        Database::query($sql);
                        $user = self::get_user_id_by_row_entity_id($seq['sequence_row_entity_id_next']);
                        foreach ($user as $us) {
                            self::temp_hack_4_set_aval($seq['sequence_row_entity_id_next'], $us['user_id'], $us['session_id'], 1);
                        }
                    }
                }
            }
            $sql = "DELETE FROM $seq_table WHERE
            (sequence_row_entity_id = $row_entity_id AND sequence_row_entity_id_next = 0 ) OR
            (sequence_row_entity_id_next = $row_entity_id)";
            Database::query($sql);
            if (Database::affected_rows() > 0) {
                return (!empty($seq_array))? $seq_array : true;
            }
        }
        return false;
    }

    public static function temp_hack_2_delete($entity_id, $row_id, $c_id) {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $row_entity_id = self::get_row_entity_id_by_row_id($entity_id, $row_id, $c_id);
        if ($row_entity_id !== false) {
            $row_table = Database::get_main_table(TABLE_SEQUENCE_ROW_ENTITY);
            $sql = "DELETE FROM $row_table WHERE id = $row_entity_id";
            $result = Database::query($sql);
            if (Database::affected_rows() > 0) {
                return Database::affected_rows();
            }
        }
        return false;
    }
    public static function temp_hack_5($entity_id, $row_id, $c_id, $rule_id) {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        if (self::temp_hack_3_delete($entity_id, $row_id, $c_id, $rule_id)) {
            if (self::temp_hack_4_delete($entity_id, $row_id, $c_id)) {
                if (self::temp_hack_2_delete($entity_id, $row_id, $c_id)) {
                    return true;
                }
            }
        }
        return false;
    }

    public static function temp_hack_4_set_aval($row_entity_id, $user_id, $session_id, $available, $available_end_date = null) {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $available_end_date = Database::escape_string($available_end_date);
        $available = intval(Database::escape_string($available));
        $val_table = Database::get_main_table(TABLE_SEQUENCE_VALUE);
        if ($available == 1) {
            $available_date = api_get_utc_datetime();
            $available_date = ", available_start_date = '$available_date'";
            if (!empty($available_end_date)) {
                $available_end_date = api_get_utc_datetime($available_end_date);
                $available_date .= "available_end_date = '$available_end_date'";
            }
        } else {
            $available_date = '';
        }
        $sql = "UPDATE $val_table SET available = $available
                $available_date
                WHERE sequence_row_entity_id = $row_entity_id
                AND user_id = $user_id
                AND session_id = $session_id";
        Database::query($sql);
    }

    /**
     * @param $user_id
     * @return array|bool
     */
    public static function get_row_entity_id_by_user_id($user_id)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $user_id = intval(Database::escape_string($user_id));
        if ($user_id > 0) {
            $user_filter = "WHERE user_id = $user_id";
        } else {
            $user_filter = '';
        }
        $val_table = Database::get_main_table(TABLE_SEQUENCE_VALUE);
        $sql = "SELECT sequence_row_entity_id FROM $val_table $user_filter";
        $result = Database::query($sql);
        if (Database::num_rows($result) > 0) {
            while ($temp = Database::fetch_array($result, 'ASSOC')) {
                $row_entity[] = $temp;
            }
            return $row_entity;
        }
        return false;
    }

    /**
     * Bool Available for LP
     */
    public static function get_state_lp_by_row_entity_id($row_entity_id, $user_id, $session_id)
    {
        if (self::_debug) {
            error_log('Entering '.__FUNCTION__.' in '.__FILE__);
        }
        $row_entity_id = intval(Database::escape_string($row_entity_id));
        $user_id = intval(Database::escape_string($user_id));
        $session_id = intval(Database::escape_string($session_id));

        $val_table = Database::get_main_table(TABLE_SEQUENCE_VALUE);

        if ($row_entity_id > 0 && $user_id > 0 && $session_id >= 0) {

            $val_id = self::getValIdByRowEntityId($row_entity_id, $user_id, $session_id);
            $sql_seq = "SELECT val.available, val.success FROM $val_table val
            WHERE val.id = $val_id
            LIMIT 0, 1";
            $result_seq = Database::query($sql_seq);
            $arr_seq = Database::fetch_array($result_seq, 'ASSOC');
            if (intval($arr_seq['available']) === 1) {
                if (intval($arr_seq['success']) === 1) {
                    return "completed";
                } else {
                    return "process";
                }
            } else {
                return "closed";
            }
        }
        return false;
    }
}