<?php

namespace local_treestudyplan\local\forms;
use local_treestudyplan\studyplan;
use local_treestudyplan\local\helpers\webservicehelper;
use stdClass;

/**
 * Moodleform class for the studyplan editor. A Moodleform is used here to facilitate a rich editor 
 * in the studyplan description 
 */
class studyplan_editform extends formbase {
    /**
     * Capability required to edit study plans
     * @var string
     */
    const CAP_EDIT = "local/treestudyplan:editstudyplan";

    /**
     * Translate parameters into customdata. 
     * 
     * @param object $params The parameters for form initialization
     * @return array Form data based on parameters
     */    
    public static function init_customdata(object $params) {
        $customdata = new stdClass;
        $customdata->plan = studyplan::find_by_id($params->studyplan_id);
        $customdata->context = $customdata->plan->context();
        $customdata->editoroptions = [
            'trusttext' => true,
            'subdirs' => true,
            'maxfiles' => 20,
            'maxbytes' => 20*1024*1024,
            'context' => \context_system::instance(),
        ];
        return $customdata;
    }

    /**
     * Validate security access for this form based on the customdata generated by init_customdata
     * Return true if validation passes, false or throw an exception if it does not.
     * 
     * @param object $customdata The customdata for this form
     * @return bool True if security validation passes. 
     * @throws \moodle_exception if access denied for a specific reason.
     */
    public static function check_security(object $customdata) {
        webservicehelper::require_capabilities(self::CAP_EDIT,$customdata->context); 
    }

    /**
     * Generate form data from parameters
     * Also validate parameters and access permissions here
     * 
     * @param object $customdata The parameters for form initialization
     * @return array Form data based on parameters
     */    
    public function init_formdata(object $customdata) {
        global $DB;
        /*  Use direct database retrieval to avoid our abstractions causing trouble
            with existing moodle code assumptions. 
            The form API does seem needlessly convoluted in it's use, but we need the editor...
        */
        $entry = $DB->get_record(studyplan::TABLE, ['id' => $customdata->plan->id()]);
        $entry = file_prepare_standard_editor(  $entry,
                                                'description',
                                                $customdata->editoroptions,
                                                \context_system::instance(),
                                                'local_treestudyplan',
                                                'studyplan',
                                                $entry->id);
        return $entry;
    }

    /**
     * Set up the form definition
     */
    public function definition() {
        $mform = $this->_form;
        $customdata = (object)$this->_customdata;
        // Define the form
        $mform->addElement('editor', 'description_editor',
             get_string('studyplan_description', 'local_treestudyplan'), 
             null, 
             $customdata->editoroptions);
        $mform->setType('description_editor', PARAM_RAW);
    }

    /** 
     * Process the submitted data and perform necessary actions
     * @param object $entry The processed form data;
     * @return bool True if submission successful
     * @throws \moodle_exception if an error must be given for a specific reason.
     */
    protected function process_submitted_data($entry) {
        $customdata = (object)$this->_customdata;
        // Process the provided files in the description editor
        $entry = file_postupdate_standard_editor($entry,
                                                'description',
                                                $customdata->editoroptions,
                                                \context_system::instance(),
                                                'local_treestudyplan',
                                                'studyplan',
                                                $entry->id);
        
        // Use our own abstraction to update the record, so caches are maintained
        $customdata->plan->edit(['description' => $entry->description,
                                 'descriptionformat' => $entry->descriptionformat]);

    }


}