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

/**
 * This script shows a list of courses and allows searching for courses codes
 * and names
 * @package chamilo.admin
 */

$cidReset = true;
require_once __DIR__.'/../inc/global.inc.php';
$this_section = SECTION_PLATFORM_ADMIN;

api_protect_admin_script();

$sessionId = isset($_GET['session_id']) ? $_GET['session_id'] : null;

/**
 * Get the number of courses which will be displayed
 */
function get_number_of_courses()
{
    $course_table = Database::get_main_table(TABLE_MAIN_COURSE);
    $sql = "SELECT COUNT(code) AS total_number_of_items FROM $course_table c";

    if ((api_is_platform_admin() || api_is_session_admin()) &&
        api_is_multiple_url_enabled() && api_get_current_access_url_id() != -1
    ) {
        $access_url_rel_course_table = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
        $sql .= " INNER JOIN $access_url_rel_course_table url_rel_course
                 ON (c.id = url_rel_course.c_id)";
    }

    if (isset($_GET['keyword'])) {
        $keyword = Database::escape_string("%".$_GET['keyword']."%");
        $sql .= " WHERE (
                        c.title LIKE '".$keyword."' OR
                        c.code LIKE '".$keyword."' OR
                        c.visual_code LIKE '".$keyword."'
                )
        ";
    } elseif (isset($_GET['keyword_code'])) {
        $keyword_code = Database::escape_string("%".$_GET['keyword_code']."%");
        $keyword_title = Database::escape_string("%".$_GET['keyword_title']."%");
        $keyword_category = Database::escape_string("%".$_GET['keyword_category']."%");
        $keyword_language = Database::escape_string("%".$_GET['keyword_language']."%");
        $keyword_visibility = Database::escape_string("%".$_GET['keyword_visibility']."%");
        $keyword_subscribe = Database::escape_string($_GET['keyword_subscribe']);
        $keyword_unsubscribe = Database::escape_string($_GET['keyword_unsubscribe']);

        $sql .= " WHERE
                    (c.code LIKE '".$keyword_code."' OR c.visual_code LIKE '".$keyword_code."') AND
                    c.title LIKE '".$keyword_title."' AND
                    c.category_code LIKE '".$keyword_category."' AND
                    c.course_language LIKE '".$keyword_language."' AND
                    c.visibility LIKE '".$keyword_visibility."' AND
                    c.subscribe LIKE '".$keyword_subscribe."' AND
                    c.unsubscribe LIKE '".$keyword_unsubscribe."'
        ";
    }

    // adding the filter to see the user's only of the current access_url
    if ((api_is_platform_admin() || api_is_session_admin()) &&
        api_is_multiple_url_enabled() && api_get_current_access_url_id() != -1
    ) {
        $sql .= " AND url_rel_course.access_url_id = ".api_get_current_access_url_id();
    }

    $res = Database::query($sql);
    $obj = Database::fetch_object($res);

    return $obj->total_number_of_items;
}

/**
 * Get course data to display
 * @param int $from
 * @param int $number_of_items
 * @param int $column
 * @param string $direction
 *
 * @return array
 */
function get_course_data($from, $number_of_items, $column, $direction)
{
    $course_table = Database::get_main_table(TABLE_MAIN_COURSE);

    $sql = "SELECT  code AS col0,
                    title AS col1,
                    code AS col2,
                    course_language AS col3,
                    category_code AS col4,
                    subscribe AS col5,
                    unsubscribe AS col6,
                    code AS col7,
                    visibility AS col8,
                    directory as col9,
                    visual_code
    		FROM $course_table course";

    if ((api_is_platform_admin() || api_is_session_admin()) &&
        api_is_multiple_url_enabled() && api_get_current_access_url_id() != -1
    ) {
        $access_url_rel_course_table = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_COURSE);
        $sql .= " INNER JOIN $access_url_rel_course_table url_rel_course
                 ON (course.id = url_rel_course.c_id)";
    }

    if (isset($_GET['keyword'])) {
        $keyword = Database::escape_string("%".trim($_GET['keyword'])."%");
        $sql .= " WHERE (
            title LIKE '".$keyword."' OR
            code LIKE '".$keyword."' OR
            visual_code LIKE '".$keyword."'
        )
        ";
    } elseif (isset($_GET['keyword_code'])) {
        $keyword_code = Database::escape_string("%".$_GET['keyword_code']."%");
        $keyword_title = Database::escape_string("%".$_GET['keyword_title']."%");
        $keyword_category = Database::escape_string("%".$_GET['keyword_category']."%");
        $keyword_language = Database::escape_string("%".$_GET['keyword_language']."%");
        $keyword_visibility = Database::escape_string("%".$_GET['keyword_visibility']."%");
        $keyword_subscribe = Database::escape_string($_GET['keyword_subscribe']);
        $keyword_unsubscribe = Database::escape_string($_GET['keyword_unsubscribe']);

        $sql .= " WHERE
                (code LIKE '".$keyword_code."' OR visual_code LIKE '".$keyword_code."') AND
                title LIKE '".$keyword_title."' AND
                category_code LIKE '".$keyword_category."' AND
                course_language LIKE '".$keyword_language."' AND
                visibility LIKE '".$keyword_visibility."' AND
                subscribe LIKE '".$keyword_subscribe."' AND
                unsubscribe LIKE '".$keyword_unsubscribe."'";
    }

    // Adding the filter to see the user's only of the current access_url.
    if ((api_is_platform_admin() || api_is_session_admin()) &&
        api_is_multiple_url_enabled() && api_get_current_access_url_id() != -1
    ) {
        $sql .= " AND url_rel_course.access_url_id=".api_get_current_access_url_id();
    }

    $sql .= " ORDER BY col$column $direction ";
    $sql .= " LIMIT $from, $number_of_items";

    $res = Database::query($sql);
    $courses = array();
    $languages = api_get_languages_to_array();

    while ($course = Database::fetch_array($res)) {
        // Place colour icons in front of courses.
        $show_visual_code = $course['visual_code'] != $course[2] ? Display::label($course['visual_code'], 'info') : null;
        $course[1] = get_course_visibility_icon($course[8]).'<a href="'.api_get_path(WEB_COURSE_PATH).$course[9].'/index.php">'.$course[1].'</a> '.$show_visual_code;
        $course[5] = $course[5] == SUBSCRIBE_ALLOWED ? get_lang('Yes') : get_lang('No');
        $course[6] = $course[6] == UNSUBSCRIBE_ALLOWED ? get_lang('Yes') : get_lang('No');

        $language = isset($languages[$course[3]]) ? $languages[$course[3]] : $course[3];

        $course_rem = array(
            $course[0],
            $course[1],
            $course[2],
            $language,
            $course[4],
            $course[5],
            $course[6],
            $course[7],
        );
        $courses[] = $course_rem;
    }

    return $courses;
}

/**
 * Get course data to display filtered by session name
 * @param int $from
 * @param int $number_of_items
 * @param int $column
 * @param string $direction
 * @return array
 */
function get_course_data_by_session($from, $number_of_items, $column, $direction)
{
    $course_table = Database::get_main_table(TABLE_MAIN_COURSE);
    $session_rel_course = Database::get_main_table(TABLE_MAIN_SESSION_COURSE);
    $session = Database::get_main_table(TABLE_MAIN_SESSION);

    $sql = "SELECT
                c.code AS col0,
                c.title AS col1,
                c.code AS col2,
                c.course_language AS col3,
                c.category_code AS col4,
                c.subscribe AS col5,
                c.unsubscribe AS col6,
                c.code AS col7,
                c.visibility AS col8,
                c.directory as col9,
                c.visual_code
            FROM $course_table c
            INNER JOIN $session_rel_course r
            ON c.id = r.c_id
            INNER JOIN $session s
            ON r.session_id = s.id
            ";

    if (isset($_GET['session_id']) && !empty($_GET['session_id'])) {
        $sessionId = intval($_GET['session_id']);
        $sql .= " WHERE s.id = ".$sessionId;
    }

    $sql .= " ORDER BY col$column $direction ";
    $sql .= " LIMIT $from,$number_of_items";
    $res = Database::query($sql);
    $courses = array();
    while ($course = Database::fetch_array($res)) {
        // Place colour icons in front of courses.
        $show_visual_code = $course['visual_code'] != $course[2] ? Display::label($course['visual_code'], 'info') : null;
        $course[1] = get_course_visibility_icon($course[8]).'<a href="'.api_get_path(WEB_COURSE_PATH).$course[9].'/index.php">'.$course[1].'</a> '.$show_visual_code;
        $course[5] = $course[5] == SUBSCRIBE_ALLOWED ? get_lang('Yes') : get_lang('No');
        $course[6] = $course[6] == UNSUBSCRIBE_ALLOWED ? get_lang('Yes') : get_lang('No');
        $course_rem = array($course[0], $course[1], $course[2], $course[3], $course[4], $course[5], $course[6], $course[7]);
        $courses[] = $course_rem;
    }

    return $courses;
}

/**
 * Filter to display the edit-buttons
 */
function modify_courses_filter($code)
{
    $icourse = api_get_course_info($code);
    $path = api_get_path(WEB_CODE_PATH);

    return
        '<a href="course_information.php?code='.$code.'">'.
        Display::return_icon('synthese_view.gif', get_lang('Info')).'</a>&nbsp;'.
        '<a href="'.api_get_path(WEB_COURSE_PATH).$icourse['path'].'/index.php">'.
        Display::return_icon('course_home.gif', get_lang('CourseHomepage')).'</a>&nbsp;'.
        '<a href="'.$path.'tracking/courseLog.php?'.api_get_cidreq_params($code).'">'.
        Display::return_icon('statistics.gif', get_lang('Tracking')).'</a>&nbsp;'.
        '<a href="'.$path.'admin/course_edit.php?id='.$icourse['real_id'].'">'.
        Display::return_icon('edit.png', get_lang('Edit'), array(), ICON_SIZE_SMALL).'</a>&nbsp;'.
        '<a href="'.$path.'coursecopy/create_backup.php?'.api_get_cidreq_params($code).'">'.
        Display::return_icon('backup.gif', get_lang('CreateBackup')).'</a>&nbsp;'.
        '<a href="'.$path.'admin/course_list.php?delete_course='.$code.'"  onclick="javascript: if (!confirm('."'".addslashes(api_htmlentities(get_lang('ConfirmYourChoice'), ENT_QUOTES))."'".')) return false;">'.
        Display::return_icon('delete.png', get_lang('Delete'), array(), ICON_SIZE_SMALL).'</a>';
}

/**
 * Return an icon representing the visibility of the course
 */
function get_course_visibility_icon($v)
{
    $style = 'margin-bottom:0;margin-right:5px;';
    switch ($v) {
        case 0:
            return Display::return_icon('bullet_red.png', get_lang('CourseVisibilityClosed'), array('style' => $style));
            break;
        case 1:
            return Display::return_icon('bullet_orange.png', get_lang('Private'), array('style' => $style));
            break;
        case 2:
            return Display::return_icon('bullet_green.png', get_lang('OpenToThePlatform'), array('style' => $style));
            break;
        case 3:
            return Display::return_icon('bullet_blue.png', get_lang('OpenToTheWorld'), array('style' => $style));
            break;
        case 4:
            return Display::return_icon('bullet_grey.png', get_lang('CourseVisibilityHidden'), array('style' => $style));
            break;
        default:
            return '';
    }
}

if (isset($_POST['action'])) {
    switch ($_POST['action']) {
        // Delete selected courses
        case 'delete_courses':
            $course_codes = $_POST['course'];
            if (count($course_codes) > 0) {
                foreach ($course_codes as $course_code) {
                    CourseManager::delete_course($course_code);
                    $obj_cat = new Category();
                    $obj_cat->update_category_delete($course_code);
                }
            }
            break;
    }
}
$content = '';
$message = '';
$actions = '';

if (isset($_GET['search']) && $_GET['search'] === 'advanced') {
    // Get all course categories
    $interbreadcrumb[] = array('url' => 'index.php', 'name' => get_lang('PlatformAdmin'));
    $interbreadcrumb[] = array('url' => 'course_list.php', 'name' => get_lang('CourseList'));
    $tool_name = get_lang('SearchACourse');
    $form = new FormValidator('advanced_course_search', 'get');
    $form->addElement('header', $tool_name);
    $form->addText('keyword_code', get_lang('CourseCode'), false);
    $form->addText('keyword_title', get_lang('Title'), false);

    // Category code
    $url = api_get_path(WEB_AJAX_PATH).'course.ajax.php?a=search_category';

    $form->addElement(
        'select_ajax',
        'keyword_category',
        get_lang('CourseFaculty'),
        null,
        array(
            'url' => $url
        )
    );

    $el = $form->addSelectLanguage('keyword_language', get_lang('CourseLanguage'));
    $el->addOption(get_lang('All'), '%');
    $form->addElement('radio', 'keyword_visibility', get_lang("CourseAccess"), get_lang('OpenToTheWorld'), COURSE_VISIBILITY_OPEN_WORLD);
    $form->addElement('radio', 'keyword_visibility', null, get_lang('OpenToThePlatform'), COURSE_VISIBILITY_OPEN_PLATFORM);
    $form->addElement('radio', 'keyword_visibility', null, get_lang('Private'), COURSE_VISIBILITY_REGISTERED);
    $form->addElement('radio', 'keyword_visibility', null, get_lang('CourseVisibilityClosed'), COURSE_VISIBILITY_CLOSED);
    $form->addElement('radio', 'keyword_visibility', null, get_lang('CourseVisibilityHidden'), COURSE_VISIBILITY_HIDDEN);
    $form->addElement('radio', 'keyword_visibility', null, get_lang('All'), '%');
    $form->addElement('radio', 'keyword_subscribe', get_lang('Subscription'), get_lang('Allowed'), 1);
    $form->addElement('radio', 'keyword_subscribe', null, get_lang('Denied'), 0);
    $form->addElement('radio', 'keyword_subscribe', null, get_lang('All'), '%');
    $form->addElement('radio', 'keyword_unsubscribe', get_lang('Unsubscription'), get_lang('AllowedToUnsubscribe'), 1);
    $form->addElement('radio', 'keyword_unsubscribe', null, get_lang('NotAllowedToUnsubscribe'), 0);
    $form->addElement('radio', 'keyword_unsubscribe', null, get_lang('All'), '%');
    $form->addButtonSearch(get_lang('SearchCourse'));
    $defaults['keyword_language'] = '%';
    $defaults['keyword_visibility'] = '%';
    $defaults['keyword_subscribe'] = '%';
    $defaults['keyword_unsubscribe'] = '%';
    $form->setDefaults($defaults);
    $content .= $form->returnForm();
} else {
    $interbreadcrumb[] = array('url' => 'index.php', "name" => get_lang('PlatformAdmin'));
    $tool_name = get_lang('CourseList');
    if (isset($_GET['delete_course'])) {
        CourseManager::delete_course($_GET['delete_course']);
        $obj_cat = new Category();
        $obj_cat->update_category_delete($_GET['delete_course']);

    }
    // Create a search-box
    $form = new FormValidator(
        'search_simple',
        'get',
        '',
        '',
        array(),
        FormValidator::LAYOUT_INLINE
    );
    $form->addElement(
        'text',
        'keyword',
        null,
        array('id' => 'course-search-keyword', 'aria-label' => get_lang('SearchCourse'))
    );
    $form->addButtonSearch(get_lang('SearchCourse'));
    $advanced = '<a class="btn btn-default" href="'.api_get_path(WEB_CODE_PATH).'admin/course_list.php?search=advanced"><em class="fa fa-search"></em> '.get_lang('AdvancedSearch').'</a>';

    // Create a filter by session
    $sessionFilter = new FormValidator('course_filter', 'get', '', '', array(), FormValidator::LAYOUT_INLINE);
    $url = api_get_path(WEB_AJAX_PATH).'session.ajax.php?a=search_session';
    $sessionSelect = $sessionFilter->addElement(
        'select_ajax',
        'session_name',
        get_lang('SearchCourseBySession'),
        null,
        array('url' => $url)
    );

    if (!empty($sessionId)) {
        $sessionInfo = SessionManager::fetch($sessionId);
        $sessionSelect->addOption($sessionInfo['name'], $sessionInfo['id'], ['selected' => 'selected']);
    }

    $courseListUrl = api_get_self();
    $actions1 = Display::url(
        Display::return_icon('new_course.png', get_lang('AddCourse'), [], ICON_SIZE_MEDIUM),
        api_get_path(WEB_CODE_PATH).'admin/course_add.php'
    );

    if (api_get_setting('course_validation') === 'true') {
        $actions1 .= Display::url(
            Display::return_icon('course_request_pending.png', get_lang('ReviewCourseRequests'), [], ICON_SIZE_MEDIUM),
            api_get_path(WEB_CODE_PATH).'admin/course_request_review.php'
        );
    }

    $actions2 = $form->returnForm();
    $actions3 = $sessionFilter->returnForm();
    $actions4 = $advanced;
    $actions4 .= '
    <script>
        $(function() {
            $("#session_name").on("change", function() {
                var sessionId = $(this).val();
    
                if (!sessionId) {
                    return;
                }
    
                window.location = "'.$courseListUrl.'?session_id="+sessionId;
            });
        });
    </script>';

    $actions = Display::toolbarAction('toolbar', [$actions1, $actions2, $actions3, $actions4], [2, 4, 3, 3]);

    if (isset($_GET['session_id']) && !empty($_GET['session_id'])) {
        // Create a sortable table with the course data filtered by session
        $table = new SortableTable(
            'courses',
            'get_number_of_courses',
            'get_course_data_by_session',
            2
        );
    } else {
        // Create a sortable table with the course data
        $table = new SortableTable(
            'courses',
            'get_number_of_courses',
            'get_course_data',
            2,
            20,
            'ASC',
            'course-list'
        );
    }

    $parameters = array();

    if (isset($_GET['keyword'])) {
        $parameters = array('keyword' => Security::remove_XSS($_GET['keyword']));
    } elseif (isset($_GET['keyword_code'])) {
        $parameters['keyword_code'] = Security::remove_XSS($_GET['keyword_code']);
        $parameters['keyword_title'] = Security::remove_XSS($_GET['keyword_title']);
        $parameters['keyword_category'] = Security::remove_XSS($_GET['keyword_category']);
        $parameters['keyword_language'] = Security::remove_XSS($_GET['keyword_language']);
        $parameters['keyword_visibility'] = Security::remove_XSS($_GET['keyword_visibility']);
        $parameters['keyword_subscribe'] = Security::remove_XSS($_GET['keyword_subscribe']);
        $parameters['keyword_unsubscribe'] = Security::remove_XSS($_GET['keyword_unsubscribe']);
    }

    $table->set_additional_parameters($parameters);

    $table->set_header(0, '', false, 'width="8px"');
    $table->set_header(1, get_lang('Title'), true, null, array('class' => 'title'));
    $table->set_header(2, get_lang('Code'));
    $table->set_header(3, get_lang('Language'), false, 'width="70px"');
    $table->set_header(4, get_lang('Category'));
    $table->set_header(5, get_lang('SubscriptionAllowed'), true, 'width="60px"');
    $table->set_header(6, get_lang('UnsubscriptionAllowed'), false, 'width="50px"');

    $table->set_header(
        7,
        get_lang('Action'),
        false,
        null,
        array('class' => 'td_actions')
    );
    $table->set_column_filter(7, 'modify_courses_filter');
    $table->set_form_actions(
        array('delete_courses' => get_lang('DeleteCourse')),
        'course'
    );
    $content .= $table->return_table();
}

$tpl = new Template($tool_name);
$tpl->assign('actions', $actions);
$tpl->assign('message', $message);
$tpl->assign('content', $content);
$tpl->display_one_col_template();