<?php

namespace App\Http\Controllers\Api\Transaction;

use App\Enums\TransactionStatus;
use App\Http\Controllers\Controller;
use App\Http\Requests\DepositRequest;
use App\Http\Services\VNPayService;
use App\Jobs\Mail\Customer\DepositSuccessJob;
use App\Models\Customer;
use App\Models\Log;
use App\Models\Transaction;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log as FacadesLog;
use Illuminate\Support\Str;

class TransactionController extends Controller
{
    protected VNPayService $vnpayService;

    public function __construct(VNPayService $vnpayService)
    {
        $this->vnpayService = $vnpayService;
    }

    public function handle(DepositRequest $request)
    {
        $user = $request->user();
        $transRef = time();
        $uuid = Str::uuid();
        $publicCode = 'DEP-' . now()->format('Ymd') . '-' . strtoupper(Str::random(6));
        
        $transaction = Transaction::create([
            'uuid' => $uuid,
            'public_code' => $publicCode,
            'trans' => 'DEP' . $transRef,
            'amount' => $request->amount,
            'customer_id' => $user->id,
            'status' => TransactionStatus::PENDING->value,
        ]);

        $paymentUrl = $this->vnpayService->createPaymentUrl([
            'amount' => $request->amount,
            'transaction_ref' => $transRef,
            'transaction_uuid' => $uuid,
        ]);

        return response()->json([
            'error' => false,
            'message' => 'Tạo yêu cầu nạp tiền thành công',
            'data' => [
                'transaction_id' => $transaction->trans,
                'transaction_uuid' => $uuid,
                'transaction_code' => $publicCode,
                'payment_url' => $paymentUrl,
            ],
        ]);
    }

    protected function redirectToFrontend(string $status = 'failed', ?string $transactionCode = null): \Illuminate\Http\RedirectResponse
    {
        $frontendUrl = config('vnpay.frontend_url', 'http://localhost:3000');
        $url = $frontendUrl . '/nap-tien/return';
        
        $params = ['status' => $status];
        
        if ($transactionCode) {
            $params['code'] = $transactionCode;
        }
        
        return redirect()->away($url . '?' . http_build_query($params));
    }
    
    public function returnCallback(Request $request)
    {
        $data = $request->all();
        
        $vnp_TxnRef = $data['vnp_TxnRef'] ?? null;
        $vnp_Amount = $data['vnp_Amount'] ?? 0;
        
        FacadesLog::info('VNPay callback received', [
            'vnp_TxnRef' => $vnp_TxnRef,
            'vnp_Amount' => $vnp_Amount,
            'user' => $request->user() ? $request->user()->id : 'not authenticated',
        ]);
        
        $transaction = Transaction::where('trans', 'DEP' . $vnp_TxnRef)->first();

        if (!$transaction) {
            return $this->redirectToFrontend('failed');
        }

        if ($transaction->status == TransactionStatus::COMPLETED->value) {
            return $this->redirectToFrontend('success', $transaction->public_code);
        }

        $verify = $this->vnpayService->verifyPayment($data);

        FacadesLog::info('VNPay callback debug', [
            'isValid' => $verify['isValid'],
            'isSuccess' => $verify['isSuccess'] ?? false,
            'responseCode' => $data['vnp_ResponseCode'] ?? 'N/A',
        ]);

        if (!$verify['isValid']) {
            return $this->redirectToFrontend('failed', $transaction->public_code);
        }

        if (!$verify['isSuccess']) {
            $transaction->update(['status' => TransactionStatus::FAILED->value]);
            return $this->redirectToFrontend('failed', $transaction->public_code);
        }

        $originalAmount = $transaction->amount * 100;
        if ($vnp_Amount != $originalAmount) {
            $transaction->update(['status' => TransactionStatus::FAILED->value]);
            return $this->redirectToFrontend('failed', $transaction->public_code);
        }

        try {
            DB::beginTransaction();

            $transaction->update(['status' => TransactionStatus::COMPLETED->value]);

            $customer = Customer::find($transaction->customer_id);

            FacadesLog::info('Customer update debug', [
                'customer_id' => $transaction->customer_id,
                'customer_found' => $customer ? true : false,
                'transaction_amount' => $transaction->amount,
                'current_total' => $customer->total ?? 'N/A',
                'current_credit' => $customer->credit ?? 'N/A',
            ]);

            $customer->total += $transaction->amount;
            $customer->credit += $transaction->amount / 100;
            $customer->save();

            FacadesLog::info('Customer after update', [
                'new_total' => $customer->total,
                'new_credit' => $customer->credit,
            ]);

            Log::create([
                'agent' => 'api',
                'client_ip' => $request->ip(),
                'description' => 'Nạp tiền vào tài khoản: ' . number_format($transaction->amount) . ' VNĐ (+' . number_format($transaction->amount / 100) . ' credit)',
                'customer_id' => $transaction->customer_id,
            ]);

            DepositSuccessJob::dispatch([
                'customer_email' => $customer->email,
                'customer_name' => $customer->fullname,
                'transaction_code' => $transaction->public_code,
                'amount' => $transaction->amount,
                'credit' => $transaction->amount / 100,
                'current_total' => $customer->total,
                'current_credit' => $customer->credit,
                'deposit_date' => now()->format('d/m/Y H:i:s'),
            ]);

            DB::commit();
        } catch (\Exception $e) {
            DB::rollBack();
            FacadesLog::error('Payment processing error: ' . $e->getMessage());
            return $this->redirectToFrontend('failed', $transaction->public_code);
        }

        return $this->redirectToFrontend('success', $transaction->public_code);
    }

    public function getTransactions(Request $request)
    {
        $user = $request->user();
        
        $transactions = Transaction::where('customer_id', $user->id)
            ->orderBy('created_at', 'desc')
            ->get();

        return response()->json([
            'error' => false,
            'message' => 'Lấy danh sách giao dịch thành công',
            'data' => $transactions,
        ]);
    }

    public function getDetailTransaction(Request $request, $slug)
    {
        $user = $request->user();
        
        $transaction = Transaction::where('trans', $slug)
            ->where('customer_id', $user->id)
            ->first();

        if (!$transaction) {
            return response()->json([
                'error' => true,
                'message' => 'Giao dịch không tồn tại',
            ], 404);
        }

        return response()->json([
            'error' => false,
            'message' => 'Lấy chi tiết giao dịch thành công',
            'data' => $transaction,
        ]);
    }

    public function verifyPayment(Request $request)
    {
        $transRef = $request->query('vnp_TxnRef');
        
        if (!$transRef) {
            return response()->json([
                'error' => true,
                'message' => 'Thiếu tham số vnp_TxnRef',
            ], 400);
        }

        $transaction = Transaction::where('trans', 'DEP' . $transRef)->first();

        if (!$transaction) {
            return response()->json([
                'error' => true,
                'message' => 'Giao dịch không tồn tại',
            ], 404);
        }

        return response()->json([
            'error' => false,
            'message' => 'Lấy thông tin giao dịch thành công',
            'data' => [
                'trans' => $transaction->trans,
                'amount' => $transaction->amount,
                'amount_vnp' => $transaction->amount * 100,
                'status' => $transaction->status,
                'status_label' => TransactionStatus::from($transaction->status)->label(),
                'created_at' => $transaction->created_at,
                'updated_at' => $transaction->updated_at,
            ],
        ]);
    }

    public function getByPublicCode(Request $request)
    {
        $code = $request->query('code');
        
        if (!$code) {
            return response()->json([
                'error' => true,
                'message' => 'Thiếu mã giao dịch',
            ], 400);
        }

        $transaction = Transaction::where('public_code', $code)->first();

        if (!$transaction) {
            return response()->json([
                'error' => true,
                'message' => 'Giao dịch không tồn tại',
            ], 404);
        }

        return response()->json([
            'error' => false,
            'message' => 'Lấy thông tin giao dịch thành công',
            'data' => [
                'transaction' => [
                    'public_code' => $transaction->public_code,
                    'amount' => $transaction->amount,
                    'amount_formatted' => number_format($transaction->amount) . ' VNĐ',
                    'status' => $transaction->status,
                    'status_label' => TransactionStatus::from($transaction->status)->label(),
                    'created_at' => $transaction->created_at->format('Y-m-d H:i:s'),
                    'paid_at' => $transaction->updated_at->format('Y-m-d H:i:s'),
                ],
                'customer' => [
                    'fullname' => $transaction->customer->fullname,
                    'email' => $transaction->customer->email,
                    'phone' => $transaction->customer->phone,
                    'address' => $transaction->customer->address,
                ],
                'balance' => [
                    'total' => $transaction->customer->total,
                    'credit' => $transaction->customer->credit,
                    'total_formatted' => number_format($transaction->customer->total) . ' VNĐ',
                    'credit_formatted' => number_format($transaction->customer->credit) . ' điểm',
                ],
            ],
        ]);
    }
}