<?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\Models\Customer;
use App\Models\Log;
use App\Models\Transaction;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

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();
        
        $transaction = Transaction::create([
            'trans' => 'DEP' . $transRef,
            'amount' => $request->amount,
            'customer_id' => $user->id,
            'status' => TransactionStatus::PENDING->value,
        ]);

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

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

    public function returnCallback(Request $request)
    {
        $data = $request->all();
        
        $vnp_TxnRef = $data['vnp_TxnRef'] ?? null;
        $vnp_Amount = $data['vnp_Amount'] ?? 0;
        
        $transaction = Transaction::where('trans', 'DEP' . $vnp_TxnRef)->first();

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

        if ($transaction->status == TransactionStatus::COMPLETED->value) {
            return response()->json([
                'error' => false,
                'message' => 'Giao dịch đã được xử lý trước đó',
                'data' => $transaction,
            ]);
        }

        $user = $request->user();
        
        if (!$user) {
            return response()->json([
                'error' => true,
                'message' => 'Vui lòng đăng nhập',
                'debug' => [
                    'transaction_found' => true,
                    'trans' => $transaction->trans,
                    'amount_db' => $transaction->amount,
                    'amount_vnp' => $vnp_Amount,
                ]
            ], 401);
        }

        if ($transaction->customer_id !== $user->id) {
            return response()->json([
                'error' => true,
                'message' => 'Giao dịch không thuộc về bạn',
            ], 403);
        }

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

        if (!$verify['isValid']) {
            return response()->json([
                'error' => true,
                'message' => 'Dữ liệu không hợp lệ',
            ], 400);
        }

        if (!$verify['isSuccess']) {
            $transaction->update(['status' => TransactionStatus::FAILED->value]);
            
            return response()->json([
                'error' => true,
                'message' => 'Thanh toán thất bại',
                'data' => $verify['data'],
            ], 400);
        }

        $originalAmount = $transaction->amount * 100;
        if ($vnp_Amount != $originalAmount) {
            $transaction->update(['status' => TransactionStatus::FAILED->value]);
            return response()->json([
                'error' => true,
                'message' => 'Số tiền không khớp',
                'debug' => [
                    'amount_db' => $transaction->amount,
                    'amount_db_times_100' => $originalAmount,
                    'amount_vnp' => $vnp_Amount,
                ]
            ], 400);
        }

        try {
            DB::beginTransaction();

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

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

            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,
            ]);

            DB::commit();
        } catch (\Exception $e) {
            DB::rollBack();
            return response()->json([
                'error' => true,
                'message' => 'Lỗi xử lý giao dịch: ' . $e->getMessage(),
            ], 500);
        }

        return response()->json([
            'error' => false,
            'message' => 'Thanh toán thành công',
            'data' => [
                'transaction' => $transaction->fresh(),
                'customer' => [
                    'total' => $customer->total,
                    'credit' => $customer->credit,
                ],
            ],
        ]);
    }

    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,
        ]);
    }
}