<?php

namespace App\Services;

use App\Models\WalletTransaction;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class ZarinpalService
{
    private string $merchantId;
    private string $baseUrl;
    private string $callbackUrl;

    public function __construct()
    {
        $this->merchantId = config('ifnex.zarinpal.merchant_id', 'fake-merchant-id-for-testing');
        $isProduction = config('ifnex.zarinpal.sandbox', true);
        
        // URLs برای محیط تست و واقعی
        $this->baseUrl = $isProduction 
            ? 'https://sandbox.zarinpal.com/pg/v4'
            : 'https://api.zarinpal.com/pg/v4';
            
        $this->callbackUrl = config('ifnex.zarinpal.callback_url', url('/api/v1/payment/callback'));
    }

    /**
     * ایجاد درخواست پرداخت (Payment Request)
     */
    public function requestPayment(
        float $amount,
        string $description,
        ?string $mobile = null,
        ?string $email = null
    ): array {
        $amountToman = (int) round($amount / 10); // ریال به تومان

        $response = Http::timeout(30)->post("{$this->baseUrl}/PaymentRequest.json", [
            'merchant_id' => $this->merchantId,
            'amount' => $amountToman,
            'currency' => 'IRR',
            'description' => $description,
            'callback_url' => $this->callbackUrl,
            'metadata' => [
                'mobile' => $mobile,
                'email' => $email,
            ],
        ]);

        $result = $response->json();

        Log::info('Zarinpal Payment Request', [
            'amount' => $amountToman,
            'response' => $result,
        ]);

        if ($result['data']['code'] !== 100) {
            throw new \Exception('خطا در ارتباط با زرین‌پال: ' . ($result['errors']['message'] ?? 'نامشخص'));
        }

        $authority = $result['data']['authority'];
        $paymentUrl = $this->getPaymentUrl($authority);

        return [
            'authority' => $authority,
            'payment_url' => $paymentUrl,
            'amount' => $amount,
            'amount_toman' => $amountToman,
        ];
    }

    /**
     * بررسی صحت پرداخت (Verification)
     */
    public function verifyPayment(string $authority, float $expectedAmount): array
    {
        $amountToman = (int) round($expectedAmount / 10);

        $response = Http::timeout(30)->post("{$this->baseUrl}/PaymentVerification.json", [
            'merchant_id' => $this->merchantId,
            'authority' => $authority,
            'amount' => $amountToman,
        ]);

        $result = $response->json();

        Log::info('Zarinpal Payment Verification', [
            'authority' => $authority,
            'response' => $result,
        ]);

        if ($result['data']['code'] === 100) {
            return [
                'success' => true,
                'ref_id' => $result['data']['ref_id'],
                'card_hash' => $result['data']['card_hash'] ?? null,
                'card_pan' => $result['data']['card_pan'] ?? null,
            ];
        } elseif ($result['data']['code'] === 101) {
            // قبلاً verify شده
            return [
                'success' => true,
                'ref_id' => $result['data']['ref_id'] ?? null,
                'already_verified' => true,
            ];
        }

        return [
            'success' => false,
            'error_code' => $result['data']['code'] ?? null,
            'error_message' => $result['errors']['message'] ?? 'نامشخص',
        ];
    }

    /**
     * ساخت لینک پرداخت
     */
    private function getPaymentUrl(string $authority): string
    {
        $isProduction = config('ifnex.zarinpal.sandbox', true);
        $gatewayUrl = $isProduction 
            ? 'https://sandbox.zarinpal.com/pg/StartPay/'
            : 'https://www.zarinpal.com/pg/StartPay/';
        
        return $gatewayUrl . $authority;
    }
}