<?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/>.

/**
 * Script for converting moodle strings to json.
 */

// Check we are in CLI.
if (isset($_SERVER['REMOTE_ADDR'])) {
    exit(1);
}
define('MOODLE_INTERNAL', 1);
define('LANGPACKSFOLDER', '../../moodle-langpacks');
define('ASSETSPATH', '../src/assets/lang/');
define('CONFIG', '../src/config.json');

$config = file_get_contents(CONFIG);
$config = (array) json_decode($config);
$config_langs = array_keys(get_object_vars($config['languages']));

// Set languages to do. If script is called using a language it will be used as unique.
if (isset($argv[1]) && !empty($argv[1])) {
    $forcedetect = false;
    $languages = explode(',', $argv[1]);
} else {
    $forcedetect = true;
    $languages = $config_langs;
}

// Process the index file, just once.
$keys = file_get_contents('langindex.json');
$keys = (array) json_decode($keys);

foreach ($keys as $key => $value) {
    $map = new StdClass();
    if ($value == 'local_moodlemobileapp') {
        $map->file = $value;
        $map->string = $key;
        $exp = explode('.', $key, 3);

        $type = $exp[0];
        if (count($exp) == 3) {
            $component = $exp[1];
            $plainid = $exp[2];
        } else {
            $component = 'moodle';
            $plainid = $exp[1];
        }

        switch($type) {
            case 'addon':
                $map->string_local = "mma.$component.$plainid";
                break;
            case 'core':
                if ($component == 'moodle') {
                    $map->string_local = "mm.core.$plainid";
                } else if ($component == 'mainmenu') {
                    $map->string_local = "mm.sidemenu.$plainid";
                } else {
                    $map->string_local = "mm.$component.$plainid";
                }
                break;
        }
    } else {
        $exp = explode('/', $value, 2);
        $map->file = $exp[0];
        if (count($exp) == 2) {
            $map->string = $exp[1];
        } else {
            $exp = explode('.', $key, 3);

            if (count($exp) == 3) {
                $map->string = $exp[2];
            } else {
                $map->string = $exp[1];
            }
        }
    }

    $keys[$key] = $map;
}
$total = count ($keys);

echo "Total strings to translate $total\n";

$add_langs = array();
// Process the languages.
foreach ($languages as $lang) {
    $ok = build_lang($lang, $keys, $total);
    if ($ok) {
        $add_langs[$lang] = $lang;
    }
}

if ($forcedetect) {
    echo "\n\n\n";

    $all_languages = glob(LANGPACKSFOLDER.'/*' , GLOB_ONLYDIR);
    function get_lang_from_dir($dir) {
        return str_replace('_', '-', explode('/', $dir)[3]);
    }
    $all_languages = array_map('get_lang_from_dir', $all_languages);
    $detect_lang = array_diff($all_languages, $languages);
    $new_langs = array();
    foreach ($detect_lang as $lang) {
        $new = detect_lang($lang, $keys, $total);
        if ($new) {
            $new_langs[$lang] = $lang;
        }
    }

    if (!empty($new_langs)) {
        echo "\n\n\nThe following languages are going to be added\n\n\n";
        foreach ($new_langs as $lang) {
            $ok = build_lang($lang, $keys, $total);
            if ($ok) {
                $add_langs[$lang] = $lang;
            }
        }
        add_langs_to_config($add_langs, $config);
    }
} else {
    add_langs_to_config($add_langs, $config);
}

function add_langs_to_config($langs, $config) {
    $changed = false;
    $config_langs = get_object_vars($config['languages']);
    foreach ($langs as $lang) {
        if (!isset($config_langs[$lang])) {
            $langfoldername = str_replace('-', '_', $lang);

            $string = [];
            include(LANGPACKSFOLDER.'/'.$langfoldername.'/langconfig.php');
            $config['languages']->$lang = $string['thislanguage'];
            $changed = true;
        }
    }

    if ($changed) {
        $config['languages'] = json_decode( json_encode( $config['languages'] ), true );
        ksort($config['languages']);
        $config['languages'] = json_decode( json_encode( $config['languages'] ), false );
        file_put_contents(CONFIG, json_encode($config, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT));
    }
}

function build_lang($lang, $keys, $total) {
    $local = 0;
    $translations = [];
    $langfoldername = str_replace('-', '_', $lang);

    if (!is_dir(LANGPACKSFOLDER.'/'.$langfoldername) || !is_file(LANGPACKSFOLDER.'/'.$langfoldername.'/langconfig.php')) {
        echo "Cannot translate $langfoldername, folder not found";
        return false;
    }

    $string = [];
    include(LANGPACKSFOLDER.'/'.$langfoldername.'/langconfig.php');
    $parent = isset($string['parentlanguage']) ? $string['parentlanguage'] : "";

    echo "Processing $lang";
    if ($parent != "" && $parent != $lang) {
        echo "($parent)";
    }


    // Add the translation to the array.
    foreach ($keys as $key => $value) {
        $file = LANGPACKSFOLDER.'/'.$langfoldername.'/'.$value->file.'.php';
        // Apply translations.
        if (!file_exists($file)) {
            continue;
        }

        $string = [];
        include($file);

        if (!isset($string[$value->string])) {
            if ($value->file != 'local_moodlemobileapp' || !isset($string[$value->string_local])) {
                continue;
            }
            $text = $string[$value->string_local];
        } else {
            $text = $string[$value->string];
        }

        if ($value->file != 'local_moodlemobileapp') {
            $text = str_replace('$a->', '$a.', $text);
            $text = str_replace('{$a', '{{$a', $text);
            $text = str_replace('}', '}}', $text);
            // Prevent double.
            $text = str_replace(array('{{{', '}}}'), array('{{', '}}'), $text);
        } else {
            $local++;
        }

        $translations[$key] = $text;
    }

    // Sort and save.
    ksort($translations);
    file_put_contents(ASSETSPATH.$lang.'.json', str_replace('\/', '/', json_encode($translations, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT)));

    $success = count($translations);
    $percentage = floor($success/$total *100);
    echo "\t\t$success of $total -> $percentage% ($local local)\n";

    return true;
}

function detect_lang($lang, $keys, $total) {
    $success = 0;
    $local = 0;
    $langfoldername = str_replace('-', '_', $lang);

    if (!is_dir(LANGPACKSFOLDER.'/'.$langfoldername) || !is_file(LANGPACKSFOLDER.'/'.$langfoldername.'/langconfig.php')) {
        echo "Cannot translate $langfoldername, folder not found";
        return false;
    }

    $string = [];
    include(LANGPACKSFOLDER.'/'.$langfoldername.'/langconfig.php');
    $parent = isset($string['parentlanguage']) ? $string['parentlanguage'] : "";
    if (!isset($string['thislanguage'])) {
        echo "Cannot translate $langfoldername, name not found";
        return false;
    }

    echo "Checking $lang";
    if ($parent != "" && $parent != $lang) {
        echo "($parent)";
    }
    $langname = $string['thislanguage'];
    echo " ".$langname." -D";

    // Add the translation to the array.
    foreach ($keys as $key => $value) {
        $file = LANGPACKSFOLDER.'/'.$langfoldername.'/'.$value->file.'.php';
        // Apply translations.
        if (!file_exists($file)) {
            continue;
        }

        $string = [];
        include($file);

        if (!isset($string[$value->string])) {
            if ($value->file != 'local_moodlemobileapp' || !isset($string[$value->string_local])) {
                continue;
            }
            $text = $string[$value->string_local];
        } else {
            $text = $string[$value->string];
        }

        if ($value->file == 'local_moodlemobileapp') {
            $local++;
        }

        $success++;
    }

    $percentage = floor($success/$total *100);
    echo "\t\t$success of $total -> $percentage% ($local local)";
    if (($percentage > 75 && $local > 50) || ($percentage > 50 && $local > 75)) {
        echo " \t DETECTED\n";
        return true;
    }
    echo "\n";

    return false;
}