<?php
// This file is part of the Studyplan plugin for Moodle
//
// 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 <https://www.gnu.org/licenses/>.
/**
 *
 * @package    local_treestudyplan
 * @copyright  2023 P.M. Kuipers
 * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once($CFG->dirroot.'/course/modlib.php');

use local_treestudyplan\local\helpers\webservicehelper;
use \local_treestudyplan\studyplan;
defined('MOODLE_INTERNAL') || die();

function local_treestudyplan_unit_get_editor_options($context) {
    global $CFG;
    return array('subdirs' => 1, 'maxbytes' => $CFG->maxbytes, 'maxfiles' =>-1, 'changeformat' => 1, 'context' => $context, 'noclean' => 1, 'trusttext' => 0);
}

function local_treestudyplan_extend_navigation(global_navigation $navigation) {
    global $CFG, $PAGE, $COURSE, $USER;

    $systemcontext = context_system::instance();

    // Moodle 4.0-4.2 do not yet support customizing the primary navigation bar (it is a planned feature though).
    // For now, go to theme settings and add the following into "Custom menu items".
    //    [your name for my studyplan]|/local/treestudyplan/myreport.php.
    //    [your name for studyplan viewing]|/local/treestudyplan/view-plan.php.
    //    [your name for studyplan managing]|/local/treestudyplan/edit-plan.php.
    // For example:.
    //    Mijn studieplan|/local/treestudyplan/myreport.php.
    //    Studieplannen|/local/treestudyplan/view-plan.php.
    //    Studieplannen beheren|/local/treestudyplan/edit-plan.php.

    // Using some javascript magic we'll hide the links that are not accessible.
    // (Since the Output API does not easily support inline style tags, adding one through Javascript is easier,.
    //  and not much more complex than loading a separate stylesheet for each link we want to hide).
    // We will add all the hrefs that should be hidden to this variable below.
    $hideprimary_hrefs = [];

    if ($USER->id > 1) // Don't show if user is not logged in (id == 0) or is guest user (id == 1).
    {

        $userstudyplans = studyplan::find_for_user($USER->id);
        if (!empty($userstudyplans)) {

            // Create studyplan node.
            $node = navigation_node::create(
                get_string("link_myreport", "local_treestudyplan"),
                new moodle_url($CFG->wwwroot . "/local/treestudyplan/myreport.php", array()),
                global_navigation::TYPE_SYSTEM,
                null,
                "local_treestudyplan_myreport",
                new pix_icon("myreport", '', 'local_treestudyplan')
                );
            $node->showinflatnavigation = true;
            $node->showinsecondarynavigation=true;

            // Create invitenode node.
            $invitenode = navigation_node::create(
                get_string("manage_invites", "local_treestudyplan"),
                new moodle_url($CFG->wwwroot . "/local/treestudyplan/invitations.php", array()),
                global_navigation::TYPE_CUSTOM ,
                null,
                "local_treestudyplan_invitemgmt",
                new pix_icon("invitemgmt", '', 'local_treestudyplan')
                );
            $invitenode->showinflatnavigation = false;
            $node->add_node($invitenode);

            $navigation->add_node($node, 'mycourses');
        }
        else {
            $hideprimary_hrefs[] = "/local/treestudyplan/myreport.php";
        }
        if (    has_capability('local/treestudyplan:viewuserreports', context_system::instance())
            || webservicehelper::has_capability_in_any_category('local/treestudyplan:viewuserreports')) {
            $node = navigation_node::create(
                get_string("link_viewplan", "local_treestudyplan"),
                new moodle_url($CFG->wwwroot . "/local/treestudyplan/view-plan.php", array()),
                global_navigation::TYPE_SYSTEM ,
                null,
                "local_treestudyplan_viewplan",
                new pix_icon("viewplans", '', 'local_treestudyplan')
                );
            $node->showinflatnavigation = true;
            $node->showinsecondarynavigation=true;
            $navigation->add_node($node, 'mycourses');
        }
        else {
            $hideprimary_hrefs[] = "/local/treestudyplan/view-plan.php";
        }
        if (    has_capability('local/treestudyplan:editstudyplan', context_system::instance())
              || webservicehelper::has_capability_in_any_category('local/treestudyplan:editstudyplan')
           ) {
            $node = navigation_node::create(
                get_string("cfg_plans", "local_treestudyplan"),
                new moodle_url($CFG->wwwroot . "/local/treestudyplan/edit-plan.php", array()),
                global_navigation::TYPE_SYSTEM ,
                null,
                "local_treestudyplan_editplan",
                new pix_icon("viewplans", '', 'local_treestudyplan')
                );
            $node->showinflatnavigation = true;
            $node->showinsecondarynavigation=true;
            $navigation->add_node($node, 'mycourses');
        }
        else {
            $hideprimary_hrefs[] = "/local/treestudyplan/edit-plan.php";
        }
    }
    else {
        $hideprimary_hrefs[] = "/local/treestudyplan/myreport.php";
        $hideprimary_hrefs[] = "/local/treestudyplan/edit-plan.php";
        $hideprimary_hrefs[] = "/local/treestudyplan/view-plan.php";
    }
    // Create invitenode node.
    $invitenode = navigation_node::create(
        get_string("nav_invited", "local_treestudyplan"),
        new moodle_url($CFG->wwwroot . "/local/treestudyplan/invited.php", array()),
        global_navigation::TYPE_USER ,
        null,
        "local_treestudyplan_invitemgmt",
        new pix_icon("nav_invited", '', 'local_treestudyplan')
        );
    $invitenode->showinflatnavigation = false;
    $navigation->add_node($invitenode, 'mycourses');

    // Now using some javascript magic, we'll hide the links that are not accessible.
    $PAGE->requires->js_call_amd('local_treestudyplan/primary-nav-tools', 'hide_primary', [$hideprimary_hrefs]);


}

function local_treestudyplan_extend_navigation_category_settings($navigation, context_coursecat $coursecategorycontext) {
    global $CFG, $PAGE;
    $categoryid = $coursecategorycontext->instanceid;
    if (has_capability('local/treestudyplan:editstudyplan', $coursecategorycontext)) {
        $node = $navigation->add(
            get_string('treestudyplan:editstudyplan', "local_treestudyplan"),
            new moodle_url($CFG->wwwroot . "/local/treestudyplan/edit-plan.php", ["categoryid" => $categoryid]),
            global_navigation::TYPE_CATEGORY,
            null,
            "local_treestudyplan_editplan",
            new pix_icon("editplans", '', 'local_treestudyplan')
        );

    }
    if (has_capability('local/treestudyplan:viewuserreports', $coursecategorycontext)) {
        $node = $navigation->add(
            get_string('link_viewplan', "local_treestudyplan"),
            new moodle_url($CFG->wwwroot . "/local/treestudyplan/view-plan.php", ["categoryid" => $categoryid]),
            global_navigation::TYPE_CATEGORY,
            null,
            "local_treestudyplan_viewplan",
            new pix_icon("viewplans", '', 'local_treestudyplan')
        );

    }

}

function local_treestudyplan_get_fontawesome_icon_map() {

    // Create the icon map with the icons which are used in any case.
    $iconmapping = [
            'local_treestudyplan:myreport' => 'fa-vcard',
            'local_treestudyplan:editplans' => 'fa-share-alt',
            'local_treestudyplan:viewplans' => 'fa-share-alt',
    ];

    return $iconmapping;
}
/**
 * Helper function to reset the icon system used as updatecallback function when saving some of the plugin's settings.
 */
function local_treestudyplan_reset_fontawesome_icon_map() {
    // Reset the icon system cache.
    // There is the function \core\output\icon_system::reset_caches() which does seem to be only usable in unit tests.
    // Thus, we clear the icon system cache brutally.
    $cache = \cache::make('core', 'fontawesomeiconmapping');
    $cache->delete('mapping');
    // And rebuild it brutally.
    $instance = \core\output\icon_system::instance(\core\output\icon_system::FONTAWESOME);
    $instance->get_icon_name_map();
}

function local_treestudyplan_send_invite($inviteid) {
    global $DB, $USER, $CFG;
    $invite = $DB->get_record("local_treestudyplan_invit", array('id' => $inviteid));

    $noreply = 'noreply@' . get_host_from_url($CFG->wwwroot);
    $mailer = get_mailer();
    $mailer->setFrom($noreply, "{$USER->firstname} {$USER->lastname}");
    $mailer->addAddress($invite->email, $invite->name);
    $mailer->addReplyTo($USER->email, "{$USER->firstname} {$USER->lastname}");

    $invitehref = $CFG->wwwroot."/local/treestudyplan/invited.php?key={$invite->invitekey}";

    $data = [    'permissions' => '',
                'invitee' => $invite->name,
                'sender' => "{$USER->firstname} {$USER->lastname}",
                'link' => $invitehref];

    if ($invite->allow_details || $invite->allow_calendar || $invite->allow_badges) {
        $data['permissions'] = get_string('invite_mail_permissions', 'local_treestudyplan');
        $data['permissions'] .= "<ul>\n";
        if ($invite->allow_details ) {
            $data['permissions'] .= "<li>".get_string('invite_allow_details', 'local_treestudyplan')."</li>\n";
        }
        if ($invite->allow_calendar) {
            $data['permissions'] .= "<li>".get_string('invite_allow_calendar', 'local_treestudyplan')."</li>\n";
        }
        if ($invite->allow_badges) {
            $data['permissions'] .= "<li>".get_string('invite_allow_badges', 'local_treestudyplan')."</li>\n";
        }

        $data['permissions'] .= "</ul></p>\n";
    }

    $body = get_string('invite_mail_text', 'local_treestudyplan', $data);
    $subject = get_string('invite_mail_subject', 'local_treestudyplan', $data);

    $html = "
    <!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>.
    <html xmlns='http://www.w3.org/1999/xhtml'>.
     <head>
      <meta http-equiv='Content-Type' content='text/html; charset=UTF-8' />
      <title>{$subject}</title>
      <meta name='viewport' content='width=device-width, initial-scale=1.0'/>
    </head>
    <body>
    {$body}
    </body>
    </html>";

    $mailer->isHTML(true);
    $mailer->Subject = $subject;
    $mailer->Body = $html;
    $mailer->AltBody = strip_tags($body);

    $mailer->send();

}

function local_treestudyplan_find_cohortmembers($cohortid) {
    global $DB;
    // By default wherecondition retrieves all users except the deleted, not confirmed and guest.
    $params = ['cohortid' => $cohortid];
    $sql = "SELECT * FROM {user} u
                JOIN {cohort_members} cm ON (cm.userid = u.id AND cm.cohortid = :cohortid)
            WHERE u.suspended = 0 AND u.id > 1
            ORDER BY u.lastname
            ";
    $availableusers = $DB->get_records_sql($sql, $params);
    return $availableusers;
}

function local_treestudyplan_get_cohort_path($cohort) {
    $cohortcontext = context::instance_by_id($cohort->contextid);
    if ($cohortcontext && $cohortcontext->id != SYSCONTEXTID) {
        $ctxpath = array_map(
            function($ctx) { return $ctx->get_context_name(false);},
            $cohortcontext->get_parent_contexts(true)
            );
        array_pop($ctxpath); // Pop system context off the list.
        $ctxpath = array_reverse($ctxpath);
        $ctxpath[] = $cohort->name;

        return implode(" / ", $ctxpath);
    } else {
        return $cohort->name;
    }
}

function local_treestudyplan_output_fragment_mod_edit_form($args) {
    global $CFG;
    global $DB;
    $args = (object)$args;
    $context = $args->context;

    if (empty($args->cmid)) {
        return "RANDOM!";
    }

    // Check the course module exists.
    $cm = \get_coursemodule_from_id('', $args->cmid, 0, false, MUST_EXIST);

    // Check the course exists.
    $course = \get_course($cm->course);

    // Require_login.
    require_login($course, false, $cm); // Needed to setup proper $COURSE.

    list($cm, $context, $module, $data, $cw) = \get_moduleinfo_data($cm, $course);

    $modmoodleform = "$CFG->dirroot/mod/$module->name/mod_form.php";
    if (file_exists($modmoodleform)) {
        require_once($modmoodleform);
    } else {
        print_error('noformdesc');
    }

    $mformclassname = 'mod_'.$module->name.'_mod_form';
    $mform = new $mformclassname($data, $cw->section, $cm, $course);
    $mform->set_data($data);

    return $mform->render();

}