<?php
/* For licensing terms, see /license.txt */
/**
*	@package chamilo.admin
*/
/**
 * Code
* This tool allows platform admins to update class-user relations by uploading
* a CSVfile
*/

/**
 * Validates imported data.
 */
function validate_data($user_classes) {
    global $purification_option_for_usernames;
    $errors = array ();
    $classcodes = array ();
    
    /*if (!isset($_POST['subscribe']) && !isset($_POST['subscribe']))  {
          $user_class['error'] = get_lang('SelectAnAction');
          $errors[] = $user_class;
          return $errors;
    }*/
    
    $usergroup = new UserGroup();
    
    foreach ($user_classes as $index => $user_class) {
        $user_class['line'] = $index + 1;
        // 1. Check whether mandatory fields are set.
        $mandatory_fields = array ('UserName', 'ClassName');
        
        foreach ($mandatory_fields as $key => $field) {            
            if (!isset ($user_class[$field]) || strlen($user_class[$field]) == 0) {                
                $user_class['error'] = get_lang($field.'Mandatory');
                $errors[] = $user_class;
            }
        }
        
        // 2. Check whether classcode exists.
        if (isset ($user_class['ClassName']) && strlen($user_class['ClassName']) != 0) {
            // 2.1 Check whether code has been allready used in this CVS-file.
            if (!isset ($classcodes[$user_class['ClassName']])) {
                // 2.1.1 Check whether code exists in DB
                $exists = $usergroup->usergroup_exists($user_class['ClassName']);                
                if (!$exists) {
                    $user_class['error'] = get_lang('CodeDoesNotExists').': '.$user_class['ClassName'];
                    $errors[] = $user_class;
                } else {
                    $classcodes[$user_class['CourseCode']] = 1;
                }
            }
        }
        
        // 3. Check username, first, check whether it is empty.
        if (!UserManager::is_username_empty($user_class['UserName'])) {
            // 3.1. Check whether username is too long.
            if (UserManager::is_username_too_long($user_class['UserName'])) {
                $user_class['error'] = get_lang('UserNameTooLong').': '.$user_class['UserName'];
                $errors[] = $user_class;
            }
            
            $username = UserManager::purify_username($user_class['UserName'], $purification_option_for_usernames);            
            // 3.2. Check whether username exists.
            if (UserManager::is_username_available($username)) {
                $user_class['error'] = get_lang('UnknownUser').': '.$username;
                $errors[] = $user_class;
            }
        }
    }
    return $errors;
}

/**
 * Saves imported data.
 */
function save_data($users_classes) {

    global $purification_option_for_usernames;

    // Table definitions.
    $user_table 		= Database :: get_main_table(TABLE_MAIN_USER);
    
    $usergroup = new UserGroup();
    
    // Data parsing: purification + conversion (UserName, ClassName) --> (user_is, class_id)
    $csv_data = array ();
    if (!empty($users_classes)) {
        foreach ($users_classes as $user_class) {
            $sql1 = "SELECT user_id FROM $user_table WHERE username = '".Database::escape_string(UserManager::purify_username($user_class['UserName'], $purification_option_for_usernames))."'";
            $res1 = Database::query($sql1);
            $obj1 = Database::fetch_object($res1);

            $usergroup = new UserGroup();
            $id = $usergroup->get_id_by_name($user_class['ClassName']);   
            
            if ($obj1 && $id) {
                $csv_data[$id]['user_list'][] = $obj1->user_id;
                $csv_data[$id]['user_list_name'][] = $user_class['UserName'];
                $csv_data[$id]['class_name'] = $user_class['ClassName'];
            }
        }
    }
    
    // Logic for processing the request (data + UI options).
        
    if (!empty($csv_data)) {
        foreach ($csv_data as $class_id => $user_data) {
            $user_list = $user_data['user_list'];
            
            $class_name = $user_data['class_name'];
            $user_list_name = $user_data['user_list_name'];
            
            $usergroup->subscribe_users_to_usergroup($class_id, $user_list);

            /*
            $sql = "SELECT class_id FROM $class_user_table cu WHERE cu.user_id = $user_id";
            $res = Database::query($sql);
            while ($obj = Database::fetch_object($res)) {
                $db_subscriptions[$obj->class_id] = 1;
            }
            $to_subscribe   = array_diff(array_keys($csv_subscriptions), array_keys($db_subscriptions));
            $to_unsubscribe = array_diff(array_keys($db_subscriptions), array_keys($csv_subscriptions));

            // Subscriptions for new classes.
            if ($_POST['subscribe']) {
                foreach ($to_subscribe as $class_id) {
                    ClassManager::add_user($user_id, $class_id);
                }
            }
            // Unsubscription from previous classes.
            if ($_POST['unsubscribe']) {
                foreach ($to_unsubscribe as $class_id) {
                    ClassManager::unsubscribe_user($user_id, $class_id);
                }
            }*/
            $message = Display::return_message(get_lang('Class').': '.$class_name.'<br />', 'normal', false);
            $message .= Display::return_message(get_lang('Users').': '.implode(', ', $user_list_name));
            
            return $message;

        }
    }
    
   
    
    
    
}

/**
 * Reads a CSV-file.
 * @param string $file Path to the CSV-file
 * @return array All course-information read from the file
 */
function parse_csv_data($file) {
    $courses = Import::csv_to_array($file);
    return $courses;
}

$language_file = array('admin', 'registration');
$cidReset = true;

require_once '../inc/global.inc.php';

$this_section = SECTION_PLATFORM_ADMIN;
api_protect_admin_script(true);

require_once api_get_path(LIBRARY_PATH).'fileManage.lib.php';
require_once api_get_path(LIBRARY_PATH).'import.lib.php';

$tool_name = get_lang('AddUsersToAClass').' CSV';

$interbreadcrumb[] = array ('url' => 'index.php', 'name' => get_lang('PlatformAdmin'));
$interbreadcrumb[] = array ('url' => 'usergroups.php', 'name' => get_lang('Classes'));

// Set this option to true to enforce strict purification for usenames.
$purification_option_for_usernames = false;

set_time_limit(0);

$form = new FormValidator('class_user_import');
$form->addElement('file', 'import_file', get_lang('File'));
//$form->addElement('checkbox', 'subscribe', get_lang('Action'), get_lang('SubscribeUserIfNotAllreadySubscribed'));
//$form->addElement('checkbox', 'unsubscribe', '', get_lang('UnsubscribeUserIfSubscriptionIsNotInFile'));
$form->addElement('style_submit_button', 'submit', get_lang('Import'), 'class="save"');

if ($form->validate()) {
    $users_classes = parse_csv_data($_FILES['import_file']['tmp_name']);
    $errors = validate_data($users_classes);    
    if (count($errors) == 0) {        
        $return = save_data($users_classes);        
    }
}

Display :: display_header($tool_name);
echo Display::page_header($tool_name);
if (isset($return) && $return) {
    echo $return;
}

if (count($errors) != 0) {
    $error_message = "\n";
    foreach ($errors as $index => $error_class_user) {
        $error_message .= get_lang('Line').' '.$error_class_user['line'].': '.$error_class_user['error'].'</b>';
        $error_message .= "<br />";
    }
    $error_message .= "\n";
    Display :: display_error_message($error_message, false);
}
$form->display();
?>
<p><?php echo get_lang('CSVMustLookLike').' ('.get_lang('MandatoryFields').')'; ?> :</p>
<pre>
<b>UserName</b>;<b>ClassName</b>
jdoe;class01
adam;class01
</pre>
<?php
Display :: display_footer();