<?php

/**
 * Einmaliges Skript: Liest deutschsprachige Sektionen aus database/data/b2in-en/*.json,
 * übersetzt String-Werte per MyMemory (de→en) und schreibt die Dateien zurück.
 *
 * Ausführung: php database/scripts/build-b2in-en-from-de.php
 *
 * Hinweis: MyMemory hat ein Kontingent; bei Fehlern bleibt der Originaltext erhalten.
 */

declare(strict_types=1);

$dir = dirname(__DIR__).'/data/b2in-en';
$cacheFile = dirname(__DIR__).'/../storage/app/b2in-en-translation-cache.json';

$cache = is_file($cacheFile) ? json_decode((string) file_get_contents($cacheFile), true, 512, JSON_THROW_ON_ERROR) : [];

function shouldSkipString(string $s): bool
{
    $t = trim($s);
    if ($t === '') {
        return true;
    }
    if (preg_match('/^[\d\s.,:%€$+\-–—]+$/u', $t)) {
        return true;
    }
    if (preg_match('#^https?://#i', $t)) {
        return true;
    }
    if (str_starts_with($t, '/') && ! str_contains($t, ' ')) {
        return true;
    }
    if (preg_match('/^[a-z0-9._%+\-]+@[a-z0-9.\-]+\.[a-z]{2,}$/i', $t)) {
        return true;
    }

    return false;
}

function translate(string $text, array &$cache): string
{
    if (shouldSkipString($text)) {
        return $text;
    }
    if (isset($cache[$text])) {
        return $cache[$text];
    }

    $body = http_build_query([
        'q' => $text,
        'langpair' => 'de|en',
    ]);

    $ctx = stream_context_create([
        'http' => [
            'method' => 'POST',
            'timeout' => 60,
            'header' => "Content-Type: application/x-www-form-urlencoded\r\nUser-Agent: B2inCmsBuild/1.0\r\n",
            'content' => $body,
        ],
    ]);

    $raw = @file_get_contents('https://api.mymemory.translated.net/get', false, $ctx);
    if ($raw === false) {
        return $text;
    }

    $data = json_decode($raw, true);
    $out = $data['responseData']['translatedText'] ?? null;
    if (! is_string($out) || $out === '') {
        return $text;
    }

    if (($data['responseStatus'] ?? 200) !== 200) {
        return $text;
    }

    $cache[$text] = $out;
    usleep(150000);

    return $out;
}

function walk(mixed $v, callable $fn): mixed
{
    if (is_string($v)) {
        return $fn($v);
    }
    if (is_array($v)) {
        $out = [];
        foreach ($v as $k => $x) {
            $out[$k] = walk($x, $fn);
        }

        return $out;
    }

    return $v;
}

$translateFn = function (string $s) use (&$cache): string {
    return translate($s, $cache);
};

foreach (glob($dir.'/*.json') ?: [] as $path) {
    $name = basename($path);
    $data = json_decode((string) file_get_contents($path), true, 512, JSON_THROW_ON_ERROR);
    $out = walk($data, $translateFn);
    file_put_contents($path, json_encode($out, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES)."\n");
    echo "Updated {$name}\n";
}

file_put_contents($cacheFile, json_encode($cache, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE));

echo 'Done. Cache: '.$cacheFile."\n";