<?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/>.

namespace mod_minilesson\local\itemtype;

use mod_minilesson\constants;
use mod_minilesson\utils;
use templatable;
use renderable;

/**
 * Renderable class for a typing gap fill item in a minilesson activity.
 *
 * @package    mod_minilesson
 * @copyright  2023 Justin Hunt <justin@poodll.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class  item_typinggapfill extends item {

    //the item type
    public const ITEMTYPE = constants::TYPE_TGAPFILL;


    /**
     * Export the data for the mustache template.
     *
     * @param \renderer_base $output renderer to be used to render the action bar elements.
     * @return array
     */
    public function export_for_template(\renderer_base $output){

        $testitem = new \stdClass();
        $testitem = $this->get_common_elements($testitem);
        $testitem = $this->get_text_answer_elements($testitem);
        $testitem = $this->set_layout($testitem);

        // Sentences.
        $sentences = [];
        if(isset($testitem->customtext1)) {
            $sentences = explode(PHP_EOL, $testitem->customtext1);
        }

        $testitem->sentences = $this->process_typinggapfill_sentences($sentences);
        $testitem->allowretry = $this->itemrecord->{constants::GAPFILLALLOWRETRY} == 1;
        $testitem->hidestartpage = $this->itemrecord->{constants::GAPFILLHIDESTARTPAGE} == 1;

        // cloudpoodll
        $testitem = $this->set_cloudpoodll_details($testitem);

        return $testitem;
    }

    public static function validate_import($newrecord, $cm) {
        $error = new \stdClass();
        $error->col = '';
        $error->message = '';

        if ($newrecord->customtext1 == '') {
            $error->col = 'customtext1';
            $error->message = get_string('error:emptyfield', constants::M_COMPONENT);
            return $error;
        }

        //return false to indicate no error
        return false;
    }

    /*
    * This is for use with importing, telling import class each column's is, db col name, minilesson specific data type
    */
    public static function get_keycolumns() {
        //get the basic key columns and customize a little for instances of this item type
        $keycols = parent::get_keycolumns();
        $keycols['int3'] = ['jsonname' => 'allowretry', 'type' => 'boolean', 'optional' => true, 'default' => 0, 'dbname' => constants::GAPFILLALLOWRETRY];
        $keycols['text1'] = ['jsonname' => 'sentences', 'type' => 'stringarray', 'optional' => true, 'default' => [], 'dbname' => 'customtext1'];
        $keycols['int5'] = ['jsonname' => 'hidestartpage', 'type' => 'boolean', 'optional' => true, 'default' => 0, 'dbname' => constants::GAPFILLHIDESTARTPAGE];
        $keycols['fileanswer_audio'] = ['jsonname' => constants::FILEANSWER.'1_audio', 'type' => 'anonymousfile', 'optional' => true, 'default' => null, 'dbname' => false];
        $keycols['fileanswer_image'] = ['jsonname' => constants::FILEANSWER.'1_image', 'type' => 'anonymousfile', 'optional' => true, 'default' => null, 'dbname' => false];
        return $keycols;
    }

    /*
    * This function return the prompt that the generate method requires for listening gap fill items.
    */
    public static function aigen_fetch_prompt ($itemtemplate, $generatemethod) {
        switch($generatemethod) {

            case 'extract':
                $prompt = "Extract a 1 dimensional array of 4 sentences from the following {language} text: [{text}]. ";
                $prompt .= "In each sentence surround one keyword with square brackets, e.g [word]. ";
                    break;

            case 'reuse':
                // This is a special case where we reuse the existing data, so we do not need a prompt.
                // We don't call AI. So will just return an empty string.
                $prompt = "";
                break;

            case 'generate':
            default:
                $prompt = "Generate a 1 dimensional array of 4 sentences in {language} suitable for {level} level learners on the topic of: [{topic}] ";
                $prompt .= "In each sentence surround one keyword with square brackets, e.g [word]. ";
                    break;
        }
        return $prompt;
    }

}
