<?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/>.

/**
 * Class represents a htmlcert template.
 *
 * @package    mod_htmlcert
 * @copyright  2016 Mark Nelson <markn@moodle.com>, 2021-2022 Kumi Systems e.U. <office@kumi.systems>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace mod_htmlcert;

require_once(__DIR__ . "/../vendor/autoload.php");
require_once($CFG->dirroot.'/user/profile/lib.php');

use mikehaertl\wkhtmlto\Pdf;

defined('MOODLE_INTERNAL') || die();

/**
 * Class represents a htmlcert template.
 *
 * @package    mod_htmlcert
 * @copyright  2016 Mark Nelson <markn@moodle.com>, 2021-2022 Kumi Systems e.U. <office@kumi.systems>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class template {

    /**
     * @var int $id The id of the template.
     */
    protected $id;

    /**
     * @var string $name The name of this template
     */
    protected $name;

    /**
     * @var int $contextid The context id of this template
     */
    protected $contextid;

    protected $html;

    /**
     * The constructor.
     *
     * @param \stdClass $template
     */
    public function __construct($template) {
        $this->id = $template->id;
        $this->name = $template->name;
        $this->contextid = $template->contextid;
        $this->html = $template->html;
    }

    /**
     * Handles saving data.
     *
     * @param \stdClass $data the template data
     */
    public function save($data) {
        global $DB;

        $savedata = new \stdClass();
        $savedata->id = $this->id;
        $savedata->name = $data->name;
        $savedata->html = $data->html ?: $this->html;
        $savedata->timemodified = time();

        $DB->update_record('htmlcert_templates', $savedata);
    }

    /**
     * Handles deleting the template.
     *
     * @return bool return true if the deletion was successful, false otherwise
     */
    public function delete() {
        global $DB;

        if (!$DB->delete_records('htmlcert_templates', array('id' => $this->id))) {
            return false;
        }

        return true;
    }

    /**
     * Generate the PDF for the template.
     *
     * @param bool $preview true if it is a preview, false otherwise
     * @param int $userid the id of the user whose certificate we want to view
     * @param bool $return Do we want to return the contents of the PDF?
     * @return string|void Can return the PDF in string format if specified.
     */
    public function generate_pdf(bool $preview = false, int $userid = null, bool $return = false) {
        global $CFG, $DB, $USER, $SITE;

        if (empty($userid)) {
            $user = $USER;
        } else {
            $user = \core_user::get_user($userid);
        }

	profile_load_data($user);

        $htmlcert = $DB->get_record('htmlcert', ['templateid' => $this->id]);

        $pdf = new Pdf(array(
            "disable-smart-shrinking",
            "margin-bottom" => "0",
            "margin-right" => "0",
            "margin-left" => "0",
            "margin-top" => "0"
        ));

        $html = $this->html;

        $context = \context_user::instance($user->id);
        $fs = get_file_storage();
        $files = $fs->get_area_files($context->id, 'user', 'icon', 0);

        $file = null;

        $content = "";
        foreach ($files as $filefound) {
            if (!$filefound->is_directory()) {
                $file = $filefound;
                break;
            }
        }

        if ($file) {
            $location = make_request_directory() . '/target';
            $content = $file->get_content();
        }

        $html = str_replace("__PROFILEPIC__", 'data: ' . mime_content_type($file) . ';base64,' . $content, $html);

        $html = str_replace("__NAME__", $user->firstname . " " . $user->lastname, $html);

        if ($preview) {
            $code = \mod_htmlcert\certificate::generate_code();
        } else {
            $issue = $DB->get_record('htmlcert_issues', array('userid' => $user->id, 'htmlcertid' => $htmlcert->id),
                '*', IGNORE_MULTIPLE);
            $code = $issue->code;
        }

        $html = str_replace("__CERTNUM__", $code, $html);

        $courseid = $htmlcert->course ?: $SITE->id;

        $course = get_course($courseid);
        $coursename = $course->fullname;

        $html = str_replace("__COURSE__", $coursename, $html);

        $date = $issue->timecreated;

        $html = str_replace("__DATE__", userdate($date, '%B %d, %Y'), $html);

        $html = str_replace("__PIN__", $user->username, $html);

        $pdf->addPage($html);
        $pdf->send();
        die($pdf->getError());
        
        if ($return) {
            return $pdf->toString();
        }
    }

    /**
     * Handles copying this template into another.
     *
     * @param int $copytotemplateid The template id to copy to
     */
    public function copy_to_template($copytotemplateid) {
        global $DB;

        $copytotemplate = $DB->get_record('htmlcert_templates', array('id' => $copytotemplateid));
        $copytotemplate->html = $this->html;
        $DB->update_record('htmlcert_templates', $copytotemplate);
    
    }

    /**
     * Returns the id of the template.
     *
     * @return int the id of the template
     */
    public function get_id() {
        return $this->id;
    }

    /**
     * Returns the name of the template.
     *
     * @return string the name of the template
     */
    public function get_name() {
        return $this->name;
    }

    public function get_html() {
        return $this->html;
        }    

    /**
     * Returns the context id.
     *
     * @return int the context id
     */
    public function get_contextid() {
        return $this->contextid;
    }

    /**
     * Returns the context id.
     *
     * @return \context the context
     */
    public function get_context() {
        return \context::instance_by_id($this->contextid);
    }

    /**
     * Returns the context id.
     *
     * @return \context_module|null the context module, null if there is none
     */
    public function get_cm() {
        $context = $this->get_context();
        if ($context->contextlevel === CONTEXT_MODULE) {
            return get_coursemodule_from_id('htmlcert', $context->instanceid, 0, false, MUST_EXIST);
        }

        return null;
    }

    /**
     * Ensures the user has the proper capabilities to manage this template.
     *
     * @throws \required_capability_exception if the user does not have the necessary capabilities (ie. Fred)
     */
    public function require_manage() {
        require_capability('mod/htmlcert:manage', $this->get_context());
    }

    /**
     * Creates a template.
     *
     * @param string $templatename the name of the template
     * @param int $contextid the context id
     * @return \mod_htmlcert\template the template object
     */
    public static function create($templatename, $contextid) {
        global $DB;

        $template = new \stdClass();
        $template->name = $templatename;
        $template->contextid = $contextid;
        $template->timecreated = time();
        $template->timemodified = $template->timecreated;
        $template->id = $DB->insert_record('htmlcert_templates', $template);

        return new \mod_htmlcert\template($template);
    }
}