<?php

namespace App\Http\Services;

use Carbon\Carbon;
use Illuminate\Support\Facades\Auth;

class VNPayService
{
    /**
     * Create a payment URL
     *
     * @param array $data
     * @return string
     */
    public function createPaymentUrl(array $data)
    {
        $vnp_TxnRef = $data['transaction_ref'] ?? rand(1, 10000);
        
        if (!is_numeric($vnp_TxnRef)) {
            $vnp_TxnRef = preg_replace('/[^0-9]/', '', $vnp_TxnRef);
        }
        
        $vnp_Amount = $data['amount'] ?? 0;
        $vnp_Locale = $data['language'] ?? 'vn';
        $vnp_BankCode = $data['bankCode'] ?? '';
        $vnp_IpAddr = request()->ip();

        $user = Auth::guard('client')->user() ?? Auth::guard('users')->user();
        $userName = $user ? $user->fullname : 'Khách';

        $isDeposit = isset($data['transaction_ref']);
        if ($isDeposit) {
            $orderInfo = "Nạp tiền vào tài khoản - Khách hàng: " . $userName;
        } else {
            $orderId = $data['order_id'] ?? $vnp_TxnRef;
            $orderInfo = "Thông tin đơn hàng: " . $userName . " - Mã đơn hàng: " . $orderId;
        }

        // Set timezone
        Carbon::setLocale('vi');
        $startTime = Carbon::now()->format('YmdHis');
        $expire = Carbon::now()->addMinutes(15)->format('YmdHis');

        $inputData = [
            "vnp_Version" => "2.1.0",
            "vnp_TmnCode" => config('vnpay.tmn_code'),
            "vnp_Amount" => $vnp_Amount * 100,
            "vnp_Command" => "pay",
            "vnp_CreateDate" => $startTime,
            "vnp_CurrCode" => "VND",
            "vnp_IpAddr" => $vnp_IpAddr,
            "vnp_Locale" => 'vn',
            "vnp_OrderInfo" => $orderInfo,
            "vnp_OrderType" => "other",
            "vnp_ReturnUrl" => config('vnpay.return_url'),
            "vnp_TxnRef" => $vnp_TxnRef,
        ];

//    Bỏ cmt khi nếu muốn chọn thanh toán chọn thẻ thôi
//    if (isset($vnp_BankCode) && $vnp_BankCode != "") {
//        $inputData['vnp_BankCode'] = $vnp_BankCode;
//    }

        ksort($inputData);
        $query = "";
        $i = 0;
        $hashdata = "";
        foreach ($inputData as $key => $value) {
            if ($i == 1) {
                $hashdata .= '&' . urlencode($key) . "=" . urlencode($value);
            } else {
                $hashdata .= urlencode($key) . "=" . urlencode($value);
                $i = 1;
            }
            $query .= urlencode($key) . "=" . urlencode($value) . '&';
        }

        $vnp_Url = config('vnpay.url') . "?" . rtrim($query, '&');
        $vnpSecureHash = hash_hmac('sha512', $hashdata, config('vnpay.hash_secret'));
        $vnp_Url .= '&vnp_SecureHash=' . $vnpSecureHash;

        return $vnp_Url;
    }

    /**
     * Verify return data from VNPAY
     *
     * @param array $data
     * @return array
     */
    public function verifyPayment(array $data)
    {
        $vnp_SecureHash = $data['vnp_SecureHash'] ?? '';
        $inputData = [];
        foreach ($data as $key => $value) {
            if (substr($key, 0, 4) == "vnp_") {
                $inputData[$key] = $value;
            }
        }

        unset($inputData['vnp_SecureHash']);
        ksort($inputData);
        $i = 0;
        $hashData = "";
        foreach ($inputData as $key => $value) {
            if ($i == 1) {
                $hashData = $hashData . '&' . urlencode($key) . "=" . urlencode($value);
            } else {
                $hashData = $hashData . urlencode($key) . "=" . urlencode($value);
                $i = 1;
            }
        }

        $secureHash = hash_hmac('sha512', $hashData, config('vnpay.hash_secret'));

        $result = [
            'isValid' => ($secureHash == $vnp_SecureHash),
            'data' => $data,
            'isSuccess' => (($secureHash == $vnp_SecureHash) && ($data['vnp_ResponseCode'] == '00'))
        ];

        return $result;
    }
}