<?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/>.
/**
 * Webservice class for managing studyplans
 * @package    local_treestudyplan
 * @copyright  2023 P.M. Kuipers
 * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

use local_treestudyplan\local\helpers\webservicehelper;

require_once($CFG->libdir.'/externallib.php');
require_once($CFG->libdir.'/badgeslib.php');
require_once($CFG->libdir.'/gradelib.php');
require_once($CFG->dirroot.'/course/modlib.php');

/**
 * Webservice class for managing studyplans
 */
class utilityservice extends \external_api {
    /**
     * Capability required to edit study plans
     * @var string
     */
    const CAP_EDIT = "local/treestudyplan:editstudyplan";
    /**
     * Capability required to view studyplans (for other users)
     * @var string
     */
    const CAP_VIEW = "local/treestudyplan:viewuserreports";


    protected function load_mform($formname, $params, $ajaxformdata = null) {
        global $CFG;
        $modmoodleform = "$CFG->dirroot/local/treestudyplan/local/forms/{$formname}.php";
        if (!file_exists($modmoodleform)) {
            // We don't need to load the form (autoloading will handle that) but do need to check it's existence 
            throw new \moodle_exception('noformdesc', 'local_treestudyplan');;
        }
    
        $mformclassname = "\\local_treestudyplan\\local\\forms\\{$formname}";
        $jsonparams = json_decode($params);
        $mform = new $mformclassname( $jsonparams, $ajaxformdata);
        return $mform;
    }

    /**
     * Returns description of get_mform parameters
     *
     * @return \external_function_parameters
     * @since Moodle 3.1
     */
    public static function get_mform_parameters() {
        return new \external_function_parameters([
            'formname' => new \external_value(PARAM_COMPONENT, 'name of the treestudyplan form to parse'),
            'params' => new \external_value(PARAM_RAW, 'JSON encoded parameters for form initialization'),
        ]);
    }

    /**
     * Get a HTML of a studyplan mform(s) via AJAX to insert into html
     *
     * @param string $formname Name of the form.
     * @param array $params Params needed to properly initialize the form
     * @return array HTML and JavaScript fragments for insertion into stuff.
     */
    public static function get_mform($formname, $params = '') {
        global $OUTPUT, $PAGE, $CFG;

        // Hack alert: Set a default URL to stop the annoying debug.
        $PAGE->set_url('/');
        // Hack alert: Forcing bootstrap_renderer to initiate moodle page.
        $OUTPUT->header();

        // Overwriting page_requirements_manager with the fragment one so only JS included from.
        // this point is returned to the user.
        $PAGE->start_collecting_javascript_requirements();

        $mform = self::load_mform($formname, $params);
        $html = $mform->render();        

        $jsfooter = $PAGE->requires->get_end_code();
        $output = ['html' => $html, 'javascript' => $jsfooter];
        return $output;
    }

    /**
     * Returns description of get_mform() result value
     *
     * @return \core_external\external_description
     * @since Moodle 3.1
     */
    public static function get_mform_returns() {
        return new \external_single_structure(
            [
                'html' => new \external_value(PARAM_RAW, 'HTML fragment.'),
                'javascript' => new \external_value(PARAM_RAW, 'JavaScript fragment')
            ]
        );
    }
    /**
     * Parameter description for webservice function submit_cm_editform
     */
    public static function submit_mform_parameters() : \external_function_parameters {
        return new \external_function_parameters( [
            'formname' => new \external_value(PARAM_COMPONENT, 'name of the treestudyplan form to parse'),
            'params' => new \external_value(PARAM_RAW, 'JSON encoded parameters for form initialization'),
            "formdata" => new \external_value(PARAM_RAW, 'url encoded form data'),
        ] );
    }

    /**
     * Return value description for webservice function submit_cm_editform
     */
    public static function submit_mform_returns() : \external_description {
        return success::structure();
    }

    /**
     * Submit specified form data into form
     * @param string $formname Name of the form.
     * @param array $params Params needed to properly initialize the form
     * @param mixed $formdata
     * @return array Success/fail structure
     */
    public static function submit_mform($formname, $params, $formdata) {
        // Load the form, provide submitted form data and perform security checks
        $mform = self::load_mform($formname, $params, $formdata);

        if ($mform->process_submission()) {
            return success::success()->model();
        } else {
            return success::fail("Error in submission data")->model();
        }
    }


}