<?php
/**
 * Baut aus einer JSON-Datei {"Deutscher Text": "English text", …} die Übersetzungsdateien (.po und .mo) des Plugins.
 *   php wordpress-plugin/tools/build-mo.php wordpress-plugin/tools/en.json
 * Quellsprache des Plugins ist Deutsch, deshalb gibt es "Übersetzungen" nach Englisch (en_US, en_GB, …).
 * Es wird kein gettext gebraucht: Das .mo-Format wird hier selbst geschrieben.
 */
if ($argc < 2) { fwrite(STDERR, "Aufruf: php build-mo.php <en.json>\n"); exit(1); }
$map = json_decode((string) file_get_contents($argv[1]), true);
if (!is_array($map)) { fwrite(STDERR, "Ungültiges JSON.\n"); exit(1); }
$missing = array_keys(array_filter($map, fn($v) => !is_string($v) || trim($v) === ''));
if ($missing) { fwrite(STDERR, count($missing) . " Texte ohne Übersetzung, z. B.: " . $missing[0] . "\n"); exit(1); }
foreach ($map as $de => $en) {
    // Platzhalter (%s, %d) müssen übereinstimmen
    preg_match_all('/%(?:\d+\$)?[sd]/', $de, $a);
    preg_match_all('/%(?:\d+\$)?[sd]/', $en, $b);
    if ($a[0] !== $b[0]) { fwrite(STDERR, "Platzhalter ungleich: $de\n"); exit(1); }
}

$dir = dirname(__DIR__) . '/deskhub-tickets/languages/';
@mkdir($dir, 0777, true);

function po_quote(string $s): string
{
    return '"' . str_replace(["\\", "\"", "\n", "\t"], ['\\\\', '\\"', '\\n', '\\t'], $s) . '"';
}

function build_po(array $map, string $locale): string
{
    $out = "# DeskHub Tickets: English translation (source language is German)\n"
        . "msgid \"\"\nmsgstr \"\"\n"
        . "\"Project-Id-Version: DeskHub Tickets 1.0.0\\n\"\n"
        . "\"Language: $locale\\n\"\n"
        . "\"MIME-Version: 1.0\\n\"\n"
        . "\"Content-Type: text/plain; charset=UTF-8\\n\"\n"
        . "\"Content-Transfer-Encoding: 8bit\\n\"\n"
        . "\"Plural-Forms: nplurals=2; plural=(n != 1);\\n\"\n\n";
    foreach ($map as $de => $en) {
        $out .= 'msgid ' . po_quote($de) . "\nmsgstr " . po_quote($en) . "\n\n";
    }
    return $out;
}

function build_mo(array $map, string $locale): string
{
    $entries = ['' => "Project-Id-Version: DeskHub Tickets 1.0.0\nLanguage: $locale\nMIME-Version: 1.0\nContent-Type: text/plain; charset=UTF-8\nContent-Transfer-Encoding: 8bit\nPlural-Forms: nplurals=2; plural=(n != 1);\n"] + $map;
    ksort($entries, SORT_STRING);
    $n = count($entries);
    $ids = '';
    $strs = '';
    $idTable = [];
    $strTable = [];
    foreach ($entries as $id => $str) {
        $idTable[] = [strlen($id), strlen($ids)];
        $ids .= $id . "\0";
        $strTable[] = [strlen($str), strlen($strs)];
        $strs .= $str . "\0";
    }
    $headerSize = 28;
    $idTableOffset = $headerSize;
    $strTableOffset = $idTableOffset + $n * 8;
    $idsOffset = $strTableOffset + $n * 8;
    $strsOffset = $idsOffset + strlen($ids);
    $mo = pack('V*', 0x950412de, 0, $n, $idTableOffset, $strTableOffset, 0, 0);
    foreach ($idTable as [$len, $off]) $mo .= pack('VV', $len, $idsOffset + $off);
    foreach ($strTable as [$len, $off]) $mo .= pack('VV', $len, $strsOffset + $off);
    return $mo . $ids . $strs;
}

foreach (['en_US', 'en_GB', 'en_AU', 'en_CA', 'en_NZ', 'en_ZA'] as $locale) {
    file_put_contents($dir . "deskhub-tickets-$locale.po", build_po($map, $locale));
    file_put_contents($dir . "deskhub-tickets-$locale.mo", build_mo($map, $locale));
}
echo count($map) . " Texte, 6 Sprachvarianten in " . $dir . "\n";