<?php

declare(strict_types=1);

namespace App\Tests\Unit\Service;

use App\Service\GitHubProvider;
use IDCI\Bundle\GraphQLClientBundle\Client\GraphQLApiClient;
use IDCI\Bundle\GraphQLClientBundle\Client\GraphQLApiClientRegistryInterface;
use IDCI\Bundle\GraphQLClientBundle\Query\GraphQLQuery;
use PHPUnit\Framework\Attributes\CoversClass;
use PHPUnit\Framework\Attributes\Test;
use PHPUnit\Framework\TestCase;
use Psr\Log\LoggerInterface;
use Symfony\Component\HttpKernel\Exception\ServiceUnavailableHttpException;
use Symfony\Contracts\HttpClient\HttpClientInterface;
use Symfony\Contracts\HttpClient\ResponseInterface;

#[CoversClass(GitHubProvider::class)]
final class GitHubProviderTest extends TestCase
{
    private function makeProvider(
        string $username = 'user',
        string $token = 'token',
        ?HttpClientInterface $client = null,
        ?GraphQLApiClientRegistryInterface $registry = null,
    ): GitHubProvider {
        if ($registry === null) {
            $graphqlQuery = $this->createStub(GraphQLQuery::class);
            $graphqlQuery->method('getGraphQLQuery')->willReturn('query {}');

            $graphqlClient = $this->createStub(GraphQLApiClient::class);
            $graphqlClient->method('buildQuery')->willReturn($graphqlQuery);

            $registry = $this->createStub(GraphQLApiClientRegistryInterface::class);
            $registry->method('get')->willReturn($graphqlClient);
        }

        return new GitHubProvider(
            $client ?? $this->createStub(HttpClientInterface::class),
            $registry,
            $username,
            $token,
            $this->createStub(LoggerInterface::class),
        );
    }

    private function stubGraphqlResponse(array $weeks): ResponseInterface
    {
        $response = $this->createStub(ResponseInterface::class);
        $response->method('toArray')->willReturn([
            'data' => [
                'user' => [
                    'contributionsCollection' => [
                        'contributionCalendar' => ['weeks' => $weeks],
                    ],
                ],
            ],
        ]);

        return $response;
    }

    #[Test]
    public function it_returns_github_as_name(): void
    {
        $this->assertSame('github', $this->makeProvider()->getName());
    }

    #[Test]
    public function it_is_configured_when_credentials_are_set(): void
    {
        $this->assertTrue($this->makeProvider()->isConfigured());
    }

    #[Test]
    public function it_is_not_configured_when_username_is_empty(): void
    {
        $this->assertFalse($this->makeProvider(username: '')->isConfigured());
    }

    #[Test]
    public function it_is_not_configured_when_token_is_empty(): void
    {
        $this->assertFalse($this->makeProvider(token: '')->isConfigured());
    }

    #[Test]
    public function it_parses_contribution_days_from_the_graphql_response(): void
    {
        $client = $this->createStub(HttpClientInterface::class);
        $client->method('request')->willReturn($this->stubGraphqlResponse([
            ['contributionDays' => [
                ['date' => '2024-06-10', 'contributionCount' => 4],
                ['date' => '2024-06-11', 'contributionCount' => 2],
            ]],
        ]));

        $result = $this->makeProvider(client: $client)->fetch();

        $this->assertSame(4, $result['2024-06-10']);
        $this->assertSame(2, $result['2024-06-11']);
    }

    #[Test]
    public function it_skips_days_with_zero_contributions(): void
    {
        $client = $this->createStub(HttpClientInterface::class);
        $client->method('request')->willReturn($this->stubGraphqlResponse([
            ['contributionDays' => [
                ['date' => '2024-06-11', 'contributionCount' => 0],
            ]],
        ]));

        $result = $this->makeProvider(client: $client)->fetch();

        $this->assertArrayNotHasKey('2024-06-11', $result);
    }

    #[Test]
    public function it_throws_service_unavailable_exception_on_graphql_errors(): void
    {
        $response = $this->createStub(ResponseInterface::class);
        $response->method('toArray')->willReturn([
            'errors' => [['message' => 'Bad credentials']],
        ]);

        $client = $this->createStub(HttpClientInterface::class);
        $client->method('request')->willReturn($response);

        $this->expectException(ServiceUnavailableHttpException::class);

        $this->makeProvider(client: $client)->fetch();
    }

    #[Test]
    public function it_returns_empty_when_response_has_no_weeks(): void
    {
        $client = $this->createStub(HttpClientInterface::class);
        $client->method('request')->willReturn($this->stubGraphqlResponse([]));

        $result = $this->makeProvider(client: $client)->fetch();

        $this->assertSame([], $result);
    }
}