<?php
/**
 * Upload Image to Batch
 * POST /v1/batches/upload-image
 * 
 * Uploads a single image to an existing batch.
 * Supports multipart/form-data with 'image' file and 'batch_id'.
 */

declare(strict_types=1);

use App\Core\Database;
use App\Middleware\AuthMiddleware;
use App\Core\AI;
use App\Core\Encryption;
use App\Middleware\QuotaMiddleware;

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

// 1. Validate request
$batchId = $_POST['batch_id'] ?? null;
$imageOrder = (int)($_POST['image_order'] ?? 0);

if (!$batchId || !isset($_FILES['image']) || $_FILES['image']['error'] !== UPLOAD_ERR_OK) {
    $uploadError = $_FILES['image']['error'] ?? 'No file';
    json_error("معرّف الدفعة وصورة الفاتورة مطلوبان (كود: {$uploadError})", 422);
}

// 2. Verify batch belongs to this tenant and is still uploading
$db = Database::getInstance();
$stmt = $db->prepare("
    SELECT id, company_id, status, total_images 
    FROM invoice_batches 
    WHERE id = ? AND tenant_id = ? AND uploaded_by = ?
");
$stmt->execute([$batchId, $tenantId, $userId]);
$batch = $stmt->fetch();

if (!$batch) {
    json_error('الدفعة غير موجودة أو ليس لديك صلاحية', 404);
}

if ($batch['status'] !== 'uploading') {
    json_error('لا يمكن إضافة صور لدفعة تمت معالجتها', 400);
}

// 3. Validate file type
$allowedTypes = ['image/jpeg', 'image/png', 'image/webp', 'image/heic', 'image/heif'];
$mimeType = $_FILES['image']['type'];
if (!in_array($mimeType, $allowedTypes)) {
    json_error('نوع الملف غير مدعوم. المسموح: JPEG, PNG, WebP, HEIC', 422);
}

// 4. Validate file size (max 10MB)
$maxSize = 10 * 1024 * 1024;
if ($_FILES['image']['size'] > $maxSize) {
    json_error('حجم الصورة أكبر من 10 ميغابايت', 422);
}

// 5. Save file
$companyId = $batch['company_id'];
$uploadDir = STORAGE_PATH . '/invoices/' . $tenantId . '/' . $companyId . '/batches/' . $batchId;
if (!is_dir($uploadDir)) {
    mkdir($uploadDir, 0755, true);
}

$extension = pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION) ?: 'jpg';
$fileName = sprintf('img_%03d_%s.%s', $imageOrder, bin2hex(random_bytes(4)), $extension);
$targetPath = $uploadDir . '/' . $fileName;

if (!move_uploaded_file($_FILES['image']['tmp_name'], $targetPath)) {
    json_error('فشل في حفظ الصورة', 500);
}

// 6. Run AI Extraction
$fileContent = file_get_contents($targetPath);
$base64Data = base64_encode($fileContent);
$extracted = AI::extractInvoiceData($base64Data, $mimeType);

if (!$extracted) {
    // Save as raw upload if AI fails
    $invoiceId = vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex(random_bytes(16)), 4));
    $stmt = $db->prepare("INSERT INTO invoices (id, tenant_id, company_id, uploaded_by, original_file_path, status, created_at) VALUES (?, ?, ?, ?, ?, 'uploaded', NOW())");
    $stmt->execute([$invoiceId, $tenantId, $companyId, $userId, $targetPath]);
} else {
    // Save Extracted Data
    $db->beginTransaction();
    try {
        $supplierTin = $extracted['supplier']['tin'] ?? '';
        $invoiceNum = $extracted['invoice_number'] ?? '';
        $invoiceDate = $extracted['invoice_date'] ?? '';
        $validDate = (!empty($invoiceDate) && strtotime($invoiceDate)) ? $invoiceDate : null;

        $invoiceId = vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex(random_bytes(16)), 4));

        $stmt = $db->prepare("
            INSERT INTO invoices (
                id, tenant_id, company_id, uploaded_by, original_file_path, status,
                invoice_number, invoice_date, invoice_type, invoice_category,
                supplier_tin, supplier_name, supplier_address,
                buyer_tin, buyer_name, buyer_national_id,
                subtotal, tax_amount, discount_total, grand_total, currency_code,
                created_at
            ) VALUES (
                ?, ?, ?, ?, ?, 'extracted',
                ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, NOW()
            )
        ");

        $stmt->execute([
            $invoiceId, $tenantId, $companyId, $userId, $targetPath,
            $invoiceNum, $validDate, $extracted['invoice_type'] ?? 'cash', $extracted['invoice_category'] ?? 'simplified',
            Encryption::encrypt($supplierTin), Encryption::encrypt($extracted['supplier']['name'] ?? ''), Encryption::encrypt($extracted['supplier']['address'] ?? ''),
            Encryption::encrypt($extracted['buyer']['tin'] ?? ''), Encryption::encrypt($extracted['buyer']['name'] ?? ''), Encryption::encrypt($extracted['buyer']['national_id'] ?? ''),
            $extracted['subtotal'] ?? 0, $extracted['tax_amount'] ?? 0, $extracted['discount_total'] ?? 0, $extracted['grand_total'] ?? 0, $extracted['currency_code'] ?? 'JOD'
        ]);

        if (!empty($extracted['lines']) && is_array($extracted['lines'])) {
            $lineStmt = $db->prepare("INSERT INTO invoice_lines (id, invoice_id, line_number, description, quantity, unit_price, tax_rate, line_total) VALUES (?, ?, ?, ?, ?, ?, ?, ?)");
            foreach ($extracted['lines'] as $index => $item) {
                $lineId = vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex(random_bytes(16)), 4));
                $lineStmt->execute([
                    $lineId, $invoiceId, $item['line_number'] ?? ($index + 1), $item['description'] ?? 'بدون وصف',
                    $item['quantity'] ?? 1, $item['unit_price'] ?? 0, $item['tax_rate'] ?? 0.16, $item['line_total'] ?? 0
                ]);
            }
        }
        $db->commit();
        QuotaMiddleware::incrementInvoiceUsage($tenantId);
    } catch (Exception $e) {
        $db->rollBack();
        error_log("Batch Upload Error: " . $e->getMessage());
    }
}

// 7. Update batch image count
$stmt = $db->prepare("
    UPDATE invoice_batches 
    SET total_images = total_images + 1, processed_images = processed_images + 1, updated_at = NOW()
    WHERE id = ?
");
$stmt->execute([$batchId]);

// Count processed so far in batch
$stmt = $db->prepare("SELECT processed_images FROM invoice_batches WHERE id = ?");
$stmt->execute([$batchId]);
$uploadedCount = (int)$stmt->fetchColumn();

json_success([
    'uploaded' => $uploadedCount,
    'file_name' => $fileName,
], "تم رفع الصورة بنجاح ({$uploadedCount} صور في الدفعة)");