<?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/>.
/**
 * Moodle hook functions and some internally used functions
 * @package    local_treestudyplan
 * @copyright  2023 P.M. Kuipers
 * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

 defined('MOODLE_INTERNAL') || die();
 require_once($CFG->dirroot.'/course/modlib.php');

use local_treestudyplan\local\helpers\webservicehelper;
use \local_treestudyplan\studyplan;

/**
 * Describe editor options
 * @param context $context Context for options
 * @return array Editor options
 */
function local_treestudyplan_unit_get_editor_options(context $context) {
    global $CFG;
    return ['subdirs' => 1,
            'maxbytes' => $CFG->maxbytes,
            'maxfiles' => -1,
            'changeformat' => 1,
            'context' => $context,
            'noclean' => 1,
            'trusttext' => 0];
}

/**
 * Hook to extend navigation
 * @param global_navigation $navigation Navigation object
 */
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.
    */
    $hideprimaryhrefs = [];

    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 {
            $hideprimaryhrefs[] = "/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 {
            $hideprimaryhrefs[] = "/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 {
            $hideprimaryhrefs[] = "/local/treestudyplan/edit-plan.php";
        }
    } else {
        $hideprimaryhrefs[] = "/local/treestudyplan/myreport.php";
        $hideprimaryhrefs[] = "/local/treestudyplan/edit-plan.php";
        $hideprimaryhrefs[] = "/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.
    $PAGE->requires->js_call_amd('local_treestudyplan/primary-nav-tools', 'hide_primary', [$hideprimaryhrefs]);

}

/**
 * Hook to extend navigation in category view
 * @param mixed $navigation
 * @param context_coursecat $coursecategorycontext
 */
function local_treestudyplan_extend_navigation_category_settings($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')
        );

    }

}

/**
 * Map fontawesome icons for use in flat navigation
 * @return array Icon mapping
 *
 */
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();
}

/**
 * Send invitation to invited person
 * @param mixed $inviteid Database id of the invitation
 *
 */
function local_treestudyplan_send_invite($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();

}

/**
 * Hook to display fragment of activity/mod settings editor. Used in feature to edit name and description of activity
 * @param mixed $args
 * @return string Rendered form output HTML
 */
function local_treestudyplan_output_fragment_mod_edit_form($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 {
        throw new \moodle_exception('noformdesc', 'local_treestudyplan');;
    }

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

    return $mform->render();

}