<?php
/**
 * Batch-Audio-Generierung via OpenAI TTS (gpt-4o-mini-tts).
 * Liest ein JSON-Textbuch aus App/sims/heli/scripts/<file>.json und
 * erzeugt MP3s in App/sims/heli/sounds/radio/<id>.mp3
 *
 * Aufruf via Browser:
 *   http://localhost/geograsim/App/php/generate-audio-openai.php?file=tower-geo-lines.json
 *   http://localhost/geograsim/App/php/generate-audio-openai.php?file=tower-start-lines.json&voice=shimmer
 *   ?force=1 -> ueberschreibt bestehende
 */
set_time_limit(0);
ignore_user_abort(true);
header('Content-Type: text/plain; charset=utf-8');

$envFile = __DIR__ . '/../.env.local';
if (!file_exists($envFile)) { exit("ERROR: .env.local fehlt\n"); }
$OPENAI_KEY = '';
foreach (file($envFile) as $ln) {
    $ln = trim($ln);
    if ($ln === '' || $ln[0] === '#') continue;
    if (preg_match('/^OPENAI_API_KEY\s*=\s*(.+)$/', $ln, $m)) {
        $OPENAI_KEY = trim($m[1], " \t\"'");
        break;
    }
}
if (!$OPENAI_KEY) { exit("ERROR: OPENAI_API_KEY nicht in .env.local gefunden\n"); }

$file  = $_GET['file']  ?? 'tower-geo-lines.json';
$voice = $_GET['voice'] ?? 'nova';
$model = $_GET['model'] ?? 'gpt-4o-mini-tts';
$force = !empty($_GET['force']);
$instr = "Speak warmly and patiently like an encouraging female flight controller guiding a young student co-pilot. Unhurried, clear, friendly German pronunciation. Gentle reassuring tone, never robotic.";

$jsonPath = __DIR__ . '/../sims/heli/scripts/' . basename($file);
if (!file_exists($jsonPath)) { exit("ERROR: JSON nicht gefunden: $jsonPath\n"); }
$data = json_decode(file_get_contents($jsonPath), true);
if (!$data || !isset($data['lines'])) { exit("ERROR: JSON ungültig\n"); }

$outDir = __DIR__ . '/../sims/heli/sounds/radio';
if (!is_dir($outDir)) mkdir($outDir, 0777, true);

echo "Modell: $model · Stimme: $voice\n";
echo "Quelle: $file\n";
echo "Zeilen: " . count($data['lines']) . "\n";
echo str_repeat('-', 60) . "\n";
@ob_flush(); @flush();

$ok = 0; $skip = 0; $fail = 0;

foreach ($data['lines'] as $line) {
    $id   = $line['id']   ?? null;
    $text = $line['text'] ?? null;
    if (!$id || !$text) continue;

    $out = $outDir . '/' . $id . '.mp3';
    if (file_exists($out) && !$force) {
        $skip++;
        echo "skip $id.mp3 (vorhanden)\n";
        @ob_flush(); @flush();
        continue;
    }

    $body = [
        'model'           => $model,
        'voice'           => $voice,
        'input'           => $text,
        'response_format' => 'mp3',
        'speed'           => isset($_GET['speed']) ? floatval($_GET['speed']) : 1.12,
    ];
    if (strpos($model, 'mini-tts') !== false) {
        $body['instructions'] = $instr;
    }

    $ch = curl_init('https://api.openai.com/v1/audio/speech');
    curl_setopt_array($ch, [
        CURLOPT_POST           => true,
        CURLOPT_HTTPHEADER     => [
            'Authorization: Bearer ' . $OPENAI_KEY,
            'Content-Type: application/json',
        ],
        CURLOPT_POSTFIELDS     => json_encode($body, JSON_UNESCAPED_UNICODE),
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT        => 120,
    ]);
    $resp = curl_exec($ch);
    $http = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $err  = curl_error($ch);
    curl_close($ch);

    if ($http !== 200 || strlen($resp) < 1500) {
        $fail++;
        $snippet = substr($resp ?: $err, 0, 200);
        echo "FAIL $id -> HTTP $http · $snippet\n";
        @ob_flush(); @flush();
        // bei Quota/Key-Problem abbrechen
        if ($http === 401 || $http === 429 || $http === 403) {
            echo "STOP (Auth- oder Quota-Problem)\n";
            break;
        }
        continue;
    }

    file_put_contents($out, $resp);
    $ok++;
    echo "ok   $id.mp3 (" . strlen($resp) . " Bytes)\n";
    @ob_flush(); @flush();
    usleep(200000);  // 0.2 s
}

echo str_repeat('-', 60) . "\n";
echo "Zusammenfassung: ok=$ok, skip=$skip, fail=$fail\n";
$totalMp3 = count(glob($outDir . '/*.mp3'));
echo "Dateien im Ordner insgesamt: $totalMp3\n";