<?php

namespace Webkul\BagistoApi\Tests\Unit\Payments;

use Illuminate\Http\Client\Request;
use Illuminate\Support\Facades\Http;
use Tests\TestCase;
use Webkul\Paypal\Services\WebhookVerifier;

class PaypalWebhookVerifierTest extends TestCase
{
    private function verifier(array $config): WebhookVerifier
    {
        return new class($config) extends WebhookVerifier
        {
            public function __construct(protected array $config) {}

            protected function getConfigData(string $key): mixed
            {
                return $this->config[$key] ?? null;
            }
        };
    }

    private function headers(): array
    {
        return [
            'PayPal-Auth-Algo'         => 'SHA256withRSA',
            'PayPal-Cert-Url'          => 'https://api.paypal.com/cert.pem',
            'PayPal-Transmission-Id'   => 'transmission-1',
            'PayPal-Transmission-Sig'  => 'signature',
            'PayPal-Transmission-Time' => '2026-08-10T08:00:00Z',
        ];
    }

    public function test_it_verifies_a_sandbox_webhook_with_oauth(): void
    {
        Http::fake([
            'https://api-m.sandbox.paypal.com/v1/oauth2/token' => Http::response([
                'access_token' => 'access-token',
            ]),
            'https://api-m.sandbox.paypal.com/v1/notifications/verify-webhook-signature' => Http::response([
                'verification_status' => 'SUCCESS',
            ]),
        ]);

        $verifier = $this->verifier([
            'client_id'     => 'client-id',
            'client_secret' => 'client-secret',
            'webhook_id'    => 'WH-123',
            'sandbox'       => true,
        ]);

        $event = ['id' => 'WH-EVENT-1', 'event_type' => 'PAYMENT.CAPTURE.COMPLETED'];

        $this->assertTrue($verifier->verify($this->headers(), $event));

        Http::assertSentCount(2);
        Http::assertSent(function (Request $request) use ($event) {
            return $request->url() === 'https://api-m.sandbox.paypal.com/v1/notifications/verify-webhook-signature'
                && $request['webhook_id'] === 'WH-123'
                && $request['transmission_id'] === 'transmission-1'
                && $request['webhook_event'] === $event
                && $request->hasHeader('Authorization', 'Bearer access-token');
        });
    }

    public function test_it_uses_the_live_api_when_sandbox_is_disabled(): void
    {
        Http::fake([
            'https://api-m.paypal.com/v1/oauth2/token'                           => Http::response(['access_token' => 'live-token']),
            'https://api-m.paypal.com/v1/notifications/verify-webhook-signature' => Http::response([
                'verification_status' => 'FAILURE',
            ]),
        ]);

        $verifier = $this->verifier([
            'client_id'     => 'client-id',
            'client_secret' => 'client-secret',
            'webhook_id'    => 'WH-LIVE',
            'sandbox'       => false,
        ]);

        $this->assertFalse($verifier->verify($this->headers(), ['id' => 'WH-EVENT-2']));

        Http::assertSent(fn (Request $request) => str_starts_with($request->url(), 'https://api-m.paypal.com/'));
    }

    public function test_it_rejects_missing_signature_headers_without_calling_paypal(): void
    {
        Http::fake();

        $verifier = $this->verifier([
            'client_id'     => 'client-id',
            'client_secret' => 'client-secret',
            'webhook_id'    => 'WH-123',
            'sandbox'       => true,
        ]);

        $headers = $this->headers();
        unset($headers['PayPal-Transmission-Sig']);

        $this->expectException(\InvalidArgumentException::class);

        try {
            $verifier->verify($headers, ['id' => 'WH-EVENT-3']);
        } finally {
            Http::assertNothingSent();
        }
    }
}