<?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 handling associations of cohorts and users to a studyplan
 * @package    filter_bibleversesnwt
 * @copyright  2023 P.M. Kuipers
 * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

require_once($CFG->libdir.'/externallib.php');

/**
 * Webservice class for handling associations of cohorts and users to a studyplan
 */
class bibleservice extends \external_api {

    /**
     * Parameter description for webservice function list_cohort
     */
    public static function get_biblequote_parameters() : \external_function_parameters {
        return new \external_function_parameters( [
            'lang' => new \external_value(PARAM_TEXT, 'language code'),
            'book' => new \external_value(PARAM_INT, 'bible book nr'),
            'ch' => new \external_value(PARAM_INT, 'chapter number'),
            'verse' => new \external_value(PARAM_INT, 'verse number'),
            'book_end' => new \external_value(PARAM_INT, 'end bible book nr', VALUE_OPTIONAL),
            'ch_end' => new \external_value(PARAM_INT, 'end chapter number', VALUE_OPTIONAL),
            'verse_end' => new \external_value(PARAM_INT, 'end verse number', VALUE_OPTIONAL),
        ] );
    }

    /**
     * Return value description for webservice function list_cohort
     */
    public static function get_biblequote_returns() : \external_description {
        return new \external_single_structure([
            "heading" => new \external_value(PARAM_RAW, 'heading'),
            "quote" => new \external_value(PARAM_RAW, 'quote'),
        ]);
    }

    /**
     * Search cohorts for matching string
     * @param string $like String to match cohorts with
     * @param null $excludeid Do not include these cohorts
     * @param int $contextid Context to search (default system)
     * @return array
     */
    public static function get_biblequote($lang,$book,$ch,$verse,$book_end = null,$ch_end = null,$verse_end = null) {
        global $DB;
        $TABLE = "filter_bibleversesnwt";

        $search = [  
            "lang" => $lang,
            "book" => $book,
            "ch"=> $ch,
            "verse" => $verse,
            "book_end" => $book_end,
            "ch_end" => $ch_end,
            "verse_end" => $verse_end,
        ];

        $cache = $DB->get_record($TABLE,$search);
        $now = time();

        if($cache && ($now - $cache->time_retrieved) < (24*3600)) {
            // Return from cache.
            $quote = json_decode($cache->content,true);
            return $quote;
        } else {

            $range = $book .str_pad($ch,3,'0',STR_PAD_LEFT) . str_pad($verse,3,'0',STR_PAD_LEFT);

            if(!empty($book_end) && !empty($ch_end) && !empty($verse_end)) {
                $range .= "-" . $book_end .str_pad($ch_end,3,'0',STR_PAD_LEFT) . str_pad($verse_end,3,'0',STR_PAD_LEFT);
            }

            if ($lang == "nl") {
                $url = "https://www.jw.org/nl/bibliotheek/bijbel/nwt/boeken/json/html/{$range}";
            } else { // if $lang == 'en'
                $url = "https://www.jw.org/en/library/bible/nwt/books/json/html/{$range}";
            }

            $ch = curl_init();
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_SSH_COMPRESSION, true);
            $result = curl_exec($ch);
            
            $o = json_decode($result,true);
            if(isset($o["ranges"]) && isset($o["ranges"][$range])) {
                $r = $o["ranges"][$range];
                
                $quote = [
                    "heading" => $r["citation"],
                    "quote" => preg_replace('#<a.*?>(.*?)</a>#i', '\1', $r["html"]),
                ];

                // Store bible verse into cache.
                $quotejson = json_encode($quote);
                if($cache) {
                    $cache->time_retrieved = time();
                    $cache->content = $quotejson;
                    $DB->update_record($TABLE,$cache);
                } else {
                    $cache = (object)$search;
                    $cache->time_retrieved = time();
                    $cache->content = $quotejson;
                    $DB->insert_record($TABLE,$cache);
                }

                return $quote;
            } else {
                throw new \moodle_exception("Unexpected JSON code",'','',null,$result);
            }
        }
    }


}