<?php

namespace App\Services;

use App\Models\Payment;
use App\Models\User;
use App\Models\Wallet;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class PaymentGatewayService
{
    public function __construct(protected Payment $payment) {}

    public function requestPayment(User $user, float $amount, string $description = null): array
    {
        $merchantId = config('ifnex.zarinpal_merchant_id');

        if (!$merchantId || $merchantId === 'change-me') {
            return $this->mockPayment($user, $amount, $description);
        }

        $callbackUrl = config('ifnex.zarinpal_callback_url', url('/payment/callback'));

        $response = Http::post('https://api.zarinpal.com/pg/v4/payment/request', [
            'merchant_id' => $merchantId,
            'amount' => (int) ($amount * 10),
            'callback_url' => $callbackUrl,
            'description' => $description ?? 'شارچ کیف پول IFNEX',
            'metadata' => [
                'user_id' => $user->id,
                'email' => $user->email,
            ],
        ]);

        $data = $response->json();

        if (($data['data']['code'] ?? 0) !== 100) {
            Log::error('ZarinPal payment request failed', ['response' => $data]);

            return [
                'success' => false,
                'message' => 'خطا در درخواست پرداخت.',
                'code' => $data['data']['code'] ?? 0,
            ];
        }

        $authority = $data['data']['authority'];

        $this->payment->create([
            'user_id' => $user->id,
            'gateway' => 'zarinpal',
            'merchant_id' => $merchantId,
            'authority' => $authority,
            'amount' => (int) ($amount * 10),
            'currency' => 'IRR',
            'status' => 'pending',
            'description' => $description,
        ]);

        return [
            'success' => true,
            'authority' => $authority,
            'payment_url' => "https://www.zarinpal.com/pg/StartPay/{$authority}",
        ];
    }

    public function verifyPayment(string $authority, string $refId = null): array
    {
        $merchantId = config('ifnex.zarinpal_merchant_id');

        $payment = $this->payment->where('authority', $authority)->first();

        if (!$payment) {
            return [
                'success' => false,
                'message' => 'تراکنش پیدا نشد.',
            ];
        }

        if ($payment->status !== 'pending') {
            return [
                'success' => false,
                'message' => 'این تراکنش قبلاً بررسی شده است.',
            ];
        }

        if (!$merchantId || $merchantId === 'change-me') {
            return $this->mockVerify($payment);
        }

        $response = Http::post("https://api.zarinpal.com/pg/v4/payment/verify/{$merchantId}", [
            'merchant_id' => $merchantId,
            'authority' => $authority,
            'amount' => $payment->amount,
        ]);

        $data = $response->json();

        if (($data['data']['code'] ?? 0) !== 100) {
            $payment->update(['status' => 'failed']);

            return [
                'success' => false,
                'message' => 'تأیید پرداخت ناموفق بود.',
                'code' => $data['data']['code'] ?? 0,
            ];
        }

        $refId = $data['data']['ref_id'] ?? null;

        $payment->update([
            'status' => 'completed',
            'ref_id' => $refId,
            'paid_at' => now(),
        ]);

        if ($payment->wallet_id) {
            $wallet = Wallet::find($payment->wallet_id);
            if ($wallet) {
                $wallet->increment('balance', $payment->amount);
            }
        }

        return [
            'success' => true,
            'message' => 'پرداخت با موفقیت تأیید شد.',
            'ref_id' => $refId,
            'amount' => $payment->amount,
        ];
    }

    public function checkPayment(string $authority): array
    {
        $payment = $this->payment->where('authority', $authority)->first();

        if (!$payment) {
            return [
                'success' => false,
                'message' => 'تراکنش پیدا نشد.',
            ];
        }

        return [
            'success' => true,
            'status' => $payment->status,
            'amount' => $payment->amount,
            'ref_id' => $payment->ref_id,
            'paid_at' => $payment->paid_at?->toIso8601String(),
        ];
    }

    private function mockPayment(User $user, float $amount, string $description = null): array
    {
        $this->payment->create([
            'user_id' => $user->id,
            'gateway' => 'zarinpal',
            'amount' => (int) ($amount * 10),
            'currency' => 'IRR',
            'status' => 'completed',
            'description' => $description,
            'paid_at' => now(),
        ]);

        $user->wallet()->updateOrCreate(
            [],
            ['balance' => 0]
        );

        $wallet = $user->wallet()->first();
        $wallet->increment('balance', (int) ($amount * 10));

        return [
            'success' => true,
            'authority' => 'MOCK-' . strtoupper(uniqid()),
            'payment_url' => null,
            'mock' => true,
        ];
    }

    private function mockVerify(Payment $payment): array
    {
        $payment->update([
            'status' => 'completed',
            'ref_id' => 'MOCK-' . strtoupper(uniqid()),
            'paid_at' => now(),
        ]);

        if ($payment->wallet_id) {
            $wallet = Wallet::find($payment->wallet_id);
            if ($wallet) {
                $wallet->increment('balance', $payment->amount);
            }
        }

        return [
            'success' => true,
            'message' => 'پرداخت موقت تأیید شد (sandbox).',
            'ref_id' => $payment->ref_id,
            'amount' => $payment->amount,
        ];
    }
}