<?php
/* POST /api/transcribe.php
 * Body: { relpath: "commande/SO.../voice_xxx.webm" }
 * → Lädt die Audio-Datei zu einem Whisper-HTTP-Endpoint und gibt den Text zurück.
 *
 * Der Whisper-Endpoint wird über die Konstante BERICHT_WHISPER_URL konfiguriert.
 * Default: leer → Feature deaktiviert, liefert Hinweis.
 *
 * Unterstützt gängige Whisper-HTTP-APIs:
 *  - whisper.cpp server (POST /inference mit file= field)
 *  - OpenAI-kompatibel (POST /v1/audio/transcriptions mit file + model=whisper-1)
 *  - faster-whisper-server (POST /v1/audio/transcriptions)
 *
 * Auswahl per BERICHT_WHISPER_MODE: 'whispercpp' (default) | 'openai'
 */
require_once __DIR__.'/_inc.php';

api_authenticate();
global $db, $user;

$in = api_input();
$relpath = (string) ($in['relpath'] ?? $_POST['relpath'] ?? '');
if (empty($relpath)) api_fail('relpath fehlt');

if (!preg_match('#^(commande|facture|propal|bericht)/#', $relpath)) {
    api_fail('Pfad nicht erlaubt', 403);
}

$full = bericht_resolve_data_path($relpath);
if (!$full || !file_exists($full)) api_fail('Datei nicht gefunden', 404);

$whisper_url = getDolGlobalString('BERICHT_WHISPER_URL', '');
$mode        = getDolGlobalString('BERICHT_WHISPER_MODE', 'whispercpp');
$api_key     = getDolGlobalString('BERICHT_WHISPER_API_KEY', '');
$language    = getDolGlobalString('BERICHT_WHISPER_LANG', 'de');

if (empty($whisper_url)) {
    api_fail('Whisper ist nicht konfiguriert. Admin muss BERICHT_WHISPER_URL setzen.', 501);
}

// Datei-MIME ermitteln
$mime = function_exists('mime_content_type') ? mime_content_type($full) : 'audio/webm';

$ch = curl_init();
$cfile = new CURLFile($full, $mime, basename($full));

if ($mode === 'openai') {
    curl_setopt_array($ch, array(
        CURLOPT_URL => rtrim($whisper_url, '/').'/v1/audio/transcriptions',
        CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => array(
            'file' => $cfile,
            'model' => 'whisper-1',
            'language' => $language,
        ),
        CURLOPT_HTTPHEADER => $api_key ? array('Authorization: Bearer '.$api_key) : array(),
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT => 120,
    ));
} else {
    // whisper.cpp server /inference
    curl_setopt_array($ch, array(
        CURLOPT_URL => rtrim($whisper_url, '/').'/inference',
        CURLOPT_POST => true,
        CURLOPT_POSTFIELDS => array(
            'file' => $cfile,
            'language' => $language,
            'response_format' => 'json',
        ),
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT => 120,
    ));
}

$resp = curl_exec($ch);
$status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$err = curl_error($ch);
curl_close($ch);

if ($err) api_fail('Whisper-Fehler: '.$err, 502);
if ($status !== 200) api_fail('Whisper HTTP '.$status.': '.substr($resp, 0, 200), 502);

$data = json_decode($resp, true);
$text = '';
if (is_array($data)) {
    $text = $data['text'] ?? ($data['transcription'] ?? '');
} else {
    $text = (string) $resp;
}
$text = trim($text);

api_ok(array('text' => $text, 'language' => $language));