<?php

namespace App\Http\Controllers\Api;

use App\Enums\PaymentGateway;
use App\Enums\TransactionStatus;
use App\Http\Controllers\Controller;
use App\Models\Wallet;
use App\Models\WalletTransaction;
use App\Services\WalletService;
use App\Services\ZarinpalService;
use App\Services\MockZarinpalService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;

class PaymentController extends Controller
{
    public function __construct(
        protected WalletService $walletService,
        protected ZarinpalService $zarinpalService,
        protected MockZarinpalService $mockZarinpalService
    ) {}

    private function isMockMode(): bool
    {
        return config('ifnex.zarinpal.merchant_id') === 'fake-merchant-id-for-testing'
            || config('ifnex.zarinpal.sandbox', true);
    }

    private function getGatewayService()
    {
        return $this->isMockMode() ? $this->mockZarinpalService : $this->zarinpalService;
    }

    public function redirectToGateway(Request $request): JsonResponse
    {
        $user = $request->user();
        
        if (!$user) {
            return response()->json(['message' => 'Unauthorized'], 401);
        }

        $validated = $request->validate([
            'amount' => ['required', 'numeric', 'min:10000'],
            'description' => ['nullable', 'string', 'max:500'],
            'frontend_callback' => ['nullable', 'url', 'max:500'],
        ]);

        $wallet = $user->wallet ?? Wallet::create([
            'user_id' => $user->id,
            'balance' => 0,
        ]);

        if ($wallet->isFrozen()) {
            return response()->json([
                'message' => 'کیف پول شما مسدود است.',
            ], 403);
        }

        try {
            $transaction = $this->walletService->requestDeposit(
                wallet: $wallet,
                amount: $validated['amount'],
                description: $validated['description'] ?? 'شارژ آنلاین کیف پول',
                user: $user,
                gateway: PaymentGateway::ZARINPAL
            );

            $gateway = $this->getGatewayService();
            $paymentData = $gateway->requestPayment(
                amount: $validated['amount'],
                description: $validated['description'] ?? 'شارژ کیف پول IFNEX',
                mobile: $user->phone,
                email: $user->email
            );

            $metadata = $transaction->metadata ?? [];
            $metadata['zarinpal_authority'] = $paymentData['authority'];
            $metadata['frontend_callback'] = $validated['frontend_callback'] ?? null;
            $metadata['is_mock'] = $this->isMockMode();
            $transaction->update(['metadata' => $metadata]);

            return response()->json([
                'success' => true,
                'message' => 'در حال انتقال به درگاه پرداخت...',
                'payment_url' => $paymentData['payment_url'],
                'transaction_id' => $transaction->id,
                'authority' => $paymentData['authority'],
                'amount' => $paymentData['amount'],
                'is_mock' => $this->isMockMode(),
            ]);

        } catch (\Exception $e) {
            Log::error('Payment gateway error', [
                'user_id' => $user->id,
                'error' => $e->getMessage(),
            ]);

            return response()->json([
                'success' => false,
                'message' => 'خطا در ارتباط با درگاه پرداخت: ' . $e->getMessage(),
            ], 500);
        }
    }

    public function callback(Request $request): RedirectResponse
    {
        $authority = $request->input('Authority');
        $status = $request->input('Status');
        
        Log::info('Payment callback received', [
            'authority' => $authority,
            'status' => $status,
        ]);

        // پیدا کردن تراکنش با JSON_EXTRACT
        $transaction = WalletTransaction::whereRaw(
            "JSON_EXTRACT(metadata, '$.zarinpal_authority') = ?",
            [$authority]
        )->first();

        // Fallback برای MySQL قدیمی‌تر
        if (!$transaction) {
            $transaction = WalletTransaction::where('metadata->zarinpal_authority', $authority)->first();
        }

        if (!$transaction) {
            Log::warning('Payment callback: transaction not found', [
                'authority' => $authority,
            ]);
            
            return redirect(config('ifnex.zarinpal.frontend_failure_url', '/') . '?' . http_build_query([
                'status' => 'error',
                'message' => 'تراکنش یافت نشد',
            ]));
        }

        // ✅ اصلاح: تعریف $frontendCallback در ابتدای متد (قبل از هر استفاده)
        $frontendCallback = $transaction->metadata['frontend_callback'] 
            ?? config('ifnex.zarinpal.frontend_failure_url', '/');

        // بررسی اینکه تراکنش قبلاً پردازش نشده باشد
        if ($transaction->status !== TransactionStatus::PENDING) {
            Log::info('Transaction already processed', [
                'transaction_id' => $transaction->id,
                'current_status' => $transaction->status->value,
            ]);
            
            if ($transaction->status === TransactionStatus::COMPLETED) {
                return redirect($frontendCallback . '?' . http_build_query([
                    'status' => 'success',
                    'transaction_id' => $transaction->id,
                    'ref_id' => $transaction->gateway_reference_id ?? '',
                    'amount' => $transaction->amount,
                    'message' => 'این تراکنش قبلاً پردازش شده است',
                ]));
            }
            
            return redirect($frontendCallback . '?' . http_build_query([
                'status' => 'failed',
                'transaction_id' => $transaction->id,
                'message' => 'این تراکنش قبلاً ناموفق شده است',
            ]));
        }

        // کاربر پرداخت را لغو کرده
        if ($status !== 'OK') {
            $this->walletService->failTransaction($transaction, 'کاربر پرداخت را لغو کرد.');
            
            return redirect($frontendCallback . '?' . http_build_query([
                'status' => 'failed',
                'transaction_id' => $transaction->id,
                'message' => 'پرداخت ناموفق بود',
            ]));
        }

        // تایید پرداخت با درگاه
        try {
            Log::info('Verifying payment', [
                'transaction_id' => $transaction->id,
                'authority' => $authority,
                'current_status' => $transaction->status->value,
            ]);

            $gateway = $this->getGatewayService();
            $verification = $gateway->verifyPayment(
                authority: $authority,
                expectedAmount: $transaction->amount
            );

            Log::info('Payment verification result', [
                'transaction_id' => $transaction->id,
                'verification' => $verification,
            ]);

            if (!$verification['success']) {
                $this->walletService->failTransaction(
                    $transaction, 
                    'تأیید درگاه ناموفق: ' . ($verification['error_message'] ?? 'نامشخص')
                );
                
                return redirect($frontendCallback . '?' . http_build_query([
                    'status' => 'failed',
                    'transaction_id' => $transaction->id,
                    'message' => 'تأیید پرداخت ناموفق بود',
                ]));
            }

            $this->walletService->completeDeposit(
                transaction: $transaction,
                gatewayReferenceId: $verification['ref_id'] ?? $authority
            );

            // اگر تراکنش مربوط به سفارش است، status سفارش را تغییر بده
            $metadata = $transaction->metadata ?? [];
            if (!empty($metadata['is_order_payment']) && !empty($metadata['shipment_id'])) {
                $shipment = \App\Models\Shipment::find($metadata['shipment_id']);
                if ($shipment && $shipment->status === \App\Enums\ShipmentStatus::Approved) {
                    $shipment->update(['status' => \App\Enums\ShipmentStatus::Processed]);
                }
            }

            Log::info('Payment completed successfully', [
                'transaction_id' => $transaction->id,
                'amount' => $transaction->amount,
            ]);

            return redirect($frontendCallback . '?' . http_build_query([
                'status' => 'success',
                'transaction_id' => $transaction->id,
                'ref_id' => $verification['ref_id'] ?? '',
                'amount' => $transaction->amount,
            ]));

        } catch (\Exception $e) {
            Log::error('Payment callback error', [
                'transaction_id' => $transaction->id,
                'error' => $e->getMessage(),
                'file' => $e->getFile(),
                'line' => $e->getLine(),
                'trace' => $e->getTraceAsString(),
            ]);

            $this->walletService->failTransaction($transaction, 'خطای سیستمی: ' . $e->getMessage());

            return redirect($frontendCallback . '?' . http_build_query([
                'status' => 'failed',
                'transaction_id' => $transaction->id,
                'message' => 'خطای سیستمی: ' . $e->getMessage(),
            ]));
        }
    }

    public function checkStatus(Request $request, $transactionId): JsonResponse
    {
        $user = $request->user();

        $transaction = WalletTransaction::where('id', $transactionId)
            ->whereHas('wallet', fn ($q) => $q->where('user_id', $user->id))
            ->first();

        if (!$transaction) {
            return response()->json(['message' => 'تراکنش یافت نشد'], 404);
        }

        return response()->json([
            'transaction_id' => $transaction->id,
            'status' => $transaction->status->label(),
            'status_code' => $transaction->status->value,
            'amount' => $transaction->amount,
            'description' => $transaction->description,
            'reference_id' => $transaction->gateway_reference_id,
            'created_at' => $transaction->created_at->toIso8601String(),
        ]);
    }
}