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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Public API of the log report.
 *
 * Defines the APIs used by log reports
 *
 * @package    report_log
 * @copyright  1999 onwards Martin Dougiamas (http://dougiamas.com)
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die;

/**
 * This function extends the navigation with the report items
 *
 * @param navigation_node $navigation The navigation node to extend
 * @param stdClass $course The course to object for the report
 * @param stdClass $context The context of the course
 */
function report_log_extend_navigation_course($navigation, $course, $context) {
    if (has_capability('report/log:view', $context)) {
        $url = new moodle_url('/report/log/index.php', array('id'=>$course->id));
        $navigation->add(get_string('pluginname', 'report_log'), $url, navigation_node::TYPE_SETTING, null, null, new pix_icon('i/report', ''));
    }
}

/**
 * Callback to verify if the given instance of store is supported by this report or not.
 *
 * @param string $instance store instance.
 *
 * @return bool returns true if the store is supported by the report, false otherwise.
 */
function report_log_supports_logstore($instance) {
    if ($instance instanceof \core\log\sql_reader) {
        return true;
    }
    return false;
}

/**
 * This function extends the course navigation with the report items
 *
 * @param navigation_node $navigation The navigation node to extend
 * @param stdClass $user
 * @param stdClass $course The course to object for the report
 */
function report_log_extend_navigation_user($navigation, $user, $course) {
    list($all, $today) = report_log_can_access_user_report($user, $course);

if ($today) {
        $url = new moodle_url('/report/log/user.php', array('id'=>$user->id, 'course'=>$course->id, 'mode'=>'today'));
        $navigation->add(get_string('todaylogs'), $url);
    }
    if ($all) {
        $url = new moodle_url('/report/log/user.php', array('id'=>$user->id, 'course'=>$course->id, 'mode'=>'all'));
        $navigation->add(get_string('alllogs'), $url);
    }
}

/**
 * Is current user allowed to access this report
 *
 * @access private defined in lib.php for performance reasons
 * @global stdClass $USER
 * @param stdClass $user
 * @param stdClass $course
 * @return array with two elements $all, $today
 */
function report_log_can_access_user_report($user, $course) {
    global $USER;

$coursecontext = context_course::instance($course->id);
    $personalcontext = context_user::instance($user->id);

if ($user->id == $USER->id) {
        if ($course->showreports and (is_viewing($coursecontext, $USER) or is_enrolled($coursecontext, $USER))) {
            return array(true, true);
        }
    } else if (has_capability('moodle/user:viewuseractivitiesreport', $personalcontext)) {
        if ($course->showreports and (is_viewing($coursecontext, $user) or is_enrolled($coursecontext, $user))) {
            return array(true, true);
        }
    }

// Check if $USER shares group with $user (in case separated groups are enabled and 'moodle/site:accessallgroups' is disabled).
    if (!groups_user_groups_visible($course, $user->id)) {
        return array(false, false);
    }

$today = false;
    $all = false;

if (has_capability('report/log:viewtoday', $coursecontext)) {
        $today = true;
    }
    if (has_capability('report/log:view', $coursecontext)) {
        $all = true;
    }

return array($all, $today);
}

/**
 * This function extends the module navigation with the report items
 *
 * @param navigation_node $navigation The navigation node to extend
 * @param stdClass $cm
 */
function report_log_extend_navigation_module($navigation, $cm) {
    if (has_capability('report/log:view', context_course::instance($cm->course))) {
        $url = new moodle_url('/report/log/index.php', array('chooselog'=>'1','id'=>$cm->course,'modid'=>$cm->id));
        $navigation->add(get_string('logs'), $url, navigation_node::TYPE_SETTING, null, 'logreport');
    }
}

/**
 * Return a list of page types
 *
 * @param string $pagetype current page type
 * @param stdClass $parentcontext Block's parent context
 * @param stdClass $currentcontext Current context of block
 * @return array a list of page types
 */
function report_log_page_type_list($pagetype, $parentcontext, $currentcontext) {
    $array = array(
        '*'                => get_string('page-x', 'pagetype'),
        'report-*'         => get_string('page-report-x', 'pagetype'),
        'report-log-*'     => get_string('page-report-log-x',  'report_log'),
        'report-log-index' => get_string('page-report-log-index',  'report_log'),
        'report-log-user'  => get_string('page-report-log-user',  'report_log')
    );
    return $array;
}

/**
 * Add nodes to myprofile page.
 *
 * @param \core_user\output\myprofile\tree $tree Tree object
 * @param stdClass $user user object
 * @param bool $iscurrentuser
 * @param stdClass $course Course object
 *
 * @return bool
 */
function report_log_myprofile_navigation(core_user\output\myprofile\tree $tree, $user, $iscurrentuser, $course) {
    if (empty($course)) {
        // We want to display these reports under the site context.
        $course = get_fast_modinfo(SITEID)->get_course();
    }
    list($all, $today) = report_log_can_access_user_report($user, $course);
    if ($today) {
        // Today's log.
        $url = new moodle_url('/report/log/user.php',
            array('id' => $user->id, 'course' => $course->id, 'mode' => 'today'));
        $node = new core_user\output\myprofile\node('reports', 'todayslogs', get_string('todaylogs'), null, $url);
        $tree->add_node($node);
    }

if ($all) {
        // All logs.
        $url = new moodle_url('/report/log/user.php',
            array('id' => $user->id, 'course' => $course->id, 'mode' => 'all'));
        $node = new core_user\output\myprofile\node('reports', 'alllogs', get_string('alllogs'), null, $url);
        $tree->add_node($node);
    }
    return true;
}