<?php
/**
 * Finalize Batch Endpoint
 * POST /v1/batches/finalize
 * 
 * Marks a batch as ready for processing.
 * Triggers background processing (or processes synchronously depending on setup).
 */

declare(strict_types=1);

use App\Core\Database;
use App\Middleware\AuthMiddleware;
use App\Core\Security;
use App\Services\InvoiceProcessor;

$decoded = AuthMiddleware::check();
$tenantId = $decoded['tenant_id'];
$userId = $decoded['user_id'];

$data = Security::sanitize(input());
$batchId = $data['batch_id'] ?? null;

if (!$batchId) {
    json_error('معرّف الدفعة مطلوب', 422);
}

$db = Database::getInstance();

// 1. Verify batch
$stmt = $db->prepare("
    SELECT id, tenant_id, status, total_images 
    FROM invoice_batches 
    WHERE id = ? AND uploaded_by = ?
");
$stmt->execute([$batchId, $userId]);
$batch = $stmt->fetch();

if (!$batch || ($decoded['role'] !== 'super_admin' && $batch['tenant_id'] !== $tenantId)) {
    json_error('الدفعة غير موجودة', 404);
}


if ($batch['status'] !== 'uploading') {
    json_error('تم إنهاء هذه الدفعة مسبقاً', 400);
}

if ($batch['total_images'] == 0) {
    json_error('لا يمكن إنهاء دفعة فارغة', 400);
}

// 2. Mark as processing
$stmt = $db->prepare("
    UPDATE invoice_batches 
    SET status = 'processing', updated_at = NOW() 
    WHERE id = ?
");
$stmt->execute([$batchId]);

// 3. Post-Response Processing (Background)
// Manually send response instead of json_success() because it calls exit;
header('Content-Type: application/json; charset=utf-8');
http_response_code(200);
echo json_encode([
    'success'   => true,
    'data'      => [
        'batch_id' => $batchId,
        'status' => 'processing',
        'total_images' => $batch['total_images']
    ],
    'message'   => 'تم إنهاء الدفعة بنجاح وبدء المعالجة الفورية',
    'timestamp' => date('c')
], JSON_UNESCAPED_UNICODE);

// This allows the mobile app to get an instant success message, 
// while the server continues processing the AI extraction in the background.
if (function_exists('fastcgi_finish_request')) {
    fastcgi_finish_request();
}

// Ensure the script keeps running
ignore_user_abort(true);
set_time_limit(300); // Give it 5 minutes

$queueStmt = $db->prepare("SELECT id FROM invoice_processing_queue WHERE batch_id = ? AND status = 'pending'");
$queueStmt->execute([$batchId]);
$items = $queueStmt->fetchAll();

foreach ($items as $item) {
    InvoiceProcessor::processQueueItem((int)$item['id']);
}

exit; // End here