<?php
/**
 * Voice Transcribe Proxy Endpoint
 * POST /v1/voice/transcribe
 * 
 * Proxies audio file to Groq STT (Whisper) safely keeping API keys on backend.
 */

declare(strict_types=1);

use App\Middleware\AuthMiddleware;
use App\Middleware\RateLimitMiddleware;

// Rate limit: 20 per minute
RateLimitMiddleware::check(20, 60);

$decoded = AuthMiddleware::check();

if (!isset($_FILES['audio']) || $_FILES['audio']['error'] !== UPLOAD_ERR_OK) {
    json_error('ملف الصوت مطلوب', 422);
}

$apiKey = env('GROQ_API_KEY');
if (!$apiKey) {
    json_error('Groq API Key غير متوفر', 500);
}

// Ensure it's a valid audio file (basic check)
$tmpPath = $_FILES['audio']['tmp_name'];

$cfile = curl_file_create($tmpPath, $_FILES['audio']['type'], $_FILES['audio']['name']);

$postData = [
    'file' => $cfile,
    'model' => 'whisper-large-v3',
    'language' => 'ar',
    'response_format' => 'json'
];

$ch = curl_init('https://api.groq.com/openai/v1/audio/transcriptions');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => $postData,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer ' . $apiKey
    ]
]);

$response = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$error = curl_error($ch);
curl_close($ch);

if ($httpCode !== 200) {
    error_log("Groq Error: $response | $error");
    json_error('فشل في تحويل الصوت إلى نص', 500);
}

$data = json_decode($response, true);
json_success(['text' => $data['text'] ?? ''], 'تم التحويل بنجاح');