<?php

namespace App\Tests\Functional;

use App\Entity\Scenario;
use App\Entity\User;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Bundle\FrameworkBundle\KernelBrowser;
use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
use Symfony\Component\PasswordHasher\Hasher\NativePasswordHasher;
use Symfony\Component\PasswordHasher\Hasher\PasswordHasherFactory;
use Symfony\Component\PasswordHasher\Hasher\UserPasswordHasher;

final class ScenarioApiTest extends WebTestCase
{
    private const EMAIL = 'scenario-api-test@example.com';
    private const PASSWORD = 'correct-horse-battery-staple';

    private KernelBrowser $client;
    private EntityManagerInterface $em;

    protected function setUp(): void
    {
        $this->client = static::createClient();

        /** @var EntityManagerInterface $em */
        $em = static::getContainer()->get(EntityManagerInterface::class);
        $this->em = $em;

        $factory = new PasswordHasherFactory([
            User::class => new NativePasswordHasher(cost: 4),
        ]);
        $hasher = new UserPasswordHasher($factory);

        $user = new User();
        $user->setEmail(self::EMAIL);
        $user->setPassword($hasher->hashPassword($user, self::PASSWORD));

        $this->em->persist($user);
        $this->em->flush();
    }

    private function login(): void
    {
        $this->client->jsonRequest('POST', '/api/login', [
            'username' => self::EMAIL,
            'password' => self::PASSWORD,
        ]);

        self::assertLessThan(
            300,
            $this->client->getResponse()->getStatusCode(),
            'Test setup precondition: login must succeed before exercising the Scenario API.',
        );
    }

    private function persistScenario(string $name): Scenario
    {
        $scenario = new Scenario();
        $scenario->setName($name);

        $this->em->persist($scenario);
        $this->em->flush();

        return $scenario;
    }

    public function testGetCollectionIsRejectedWhenUnauthenticated(): void
    {
        $this->client->request('GET', '/api/scenarios', server: [
            'HTTP_ACCEPT' => 'application/ld+json',
        ]);

        self::assertSame(
            401,
            $this->client->getResponse()->getStatusCode(),
            'GET /api/scenarios must require authentication.',
        );
    }

    public function testGetItemIsRejectedWhenUnauthenticated(): void
    {
        $scenario = $this->persistScenario('Emergency Fund');

        $this->client->request('GET', '/api/scenarios/'.$scenario->getId(), server: [
            'HTTP_ACCEPT' => 'application/ld+json',
        ]);

        self::assertSame(
            401,
            $this->client->getResponse()->getStatusCode(),
            'GET /api/scenarios/{id} must require authentication.',
        );
    }

    public function testPostIsRejectedWhenUnauthenticated(): void
    {
        $this->client->request(
            'POST',
            '/api/scenarios',
            server: [
                'CONTENT_TYPE' => 'application/ld+json',
                'HTTP_ACCEPT' => 'application/ld+json',
            ],
            content: json_encode(['name' => 'Holiday Fund']),
        );

        self::assertSame(
            401,
            $this->client->getResponse()->getStatusCode(),
            'POST /api/scenarios must require authentication.',
        );
    }

    public function testGetCollectionReturnsPersistedScenariosWhenAuthenticated(): void
    {
        $this->persistScenario('Household Budget');
        $this->persistScenario('Travel Fund');

        $this->login();

        $this->client->request('GET', '/api/scenarios', server: [
            'HTTP_ACCEPT' => 'application/ld+json',
        ]);

        $response = $this->client->getResponse();

        self::assertSame(
            200,
            $response->getStatusCode(),
            'GET /api/scenarios must return 200 for an authenticated user.',
        );

        $body = json_decode((string) $response->getContent(), true);

        self::assertIsArray($body, 'The collection response must be a JSON-LD/Hydra object.');
        self::assertArrayHasKey(
            'member',
            $body,
            'A Hydra collection response must expose its items under the member key.',
        );

        $names = array_column($body['member'], 'name');

        self::assertContains('Household Budget', $names);
        self::assertContains('Travel Fund', $names);
    }

    public function testGetItemReturnsTheScenarioWhenAuthenticated(): void
    {
        $scenario = $this->persistScenario('Emergency Fund');

        $this->login();

        $this->client->request('GET', '/api/scenarios/'.$scenario->getId(), server: [
            'HTTP_ACCEPT' => 'application/ld+json',
        ]);

        $response = $this->client->getResponse();

        self::assertSame(
            200,
            $response->getStatusCode(),
            'GET /api/scenarios/{id} must return 200 for an authenticated user.',
        );

        $body = json_decode((string) $response->getContent(), true);

        self::assertIsArray($body, 'The item response must be a JSON-LD object.');
        self::assertArrayHasKey('@id', $body, 'A JSON-LD item must expose its IRI under @id.');
        self::assertSame('Scenario', $body['@type'] ?? null, 'The item @type must be Scenario.');
        self::assertSame('Emergency Fund', $body['name'] ?? null);
    }

    public function testPostCreatesAScenarioWhenAuthenticated(): void
    {
        $this->login();

        $this->client->request(
            'POST',
            '/api/scenarios',
            server: [
                'CONTENT_TYPE' => 'application/ld+json',
                'HTTP_ACCEPT' => 'application/ld+json',
            ],
            content: json_encode(['name' => 'Holiday Fund']),
        );

        $response = $this->client->getResponse();

        self::assertSame(
            201,
            $response->getStatusCode(),
            'POST /api/scenarios with a valid body must return 201 Created.',
        );

        $body = json_decode((string) $response->getContent(), true);

        self::assertIsArray($body, 'The created resource response must be a JSON-LD object.');
        self::assertArrayHasKey('@id', $body, 'The created resource must expose its IRI under @id.');
        self::assertSame('Holiday Fund', $body['name'] ?? null);

        $this->em->clear();

        $persisted = $this->em->getRepository(Scenario::class)->findOneBy(['name' => 'Holiday Fund']);

        self::assertNotNull(
            $persisted,
            'A successful POST /api/scenarios must persist the new Scenario to the database.',
        );
    }

    public function testPostWithMissingNameIsRejectedAsUnprocessable(): void
    {
        $this->login();

        $this->client->request(
            'POST',
            '/api/scenarios',
            server: [
                'CONTENT_TYPE' => 'application/ld+json',
                'HTTP_ACCEPT' => 'application/ld+json',
            ],
            content: json_encode([]),
        );

        self::assertSame(
            422,
            $this->client->getResponse()->getStatusCode(),
            'POST /api/scenarios without a name must return 422 Unprocessable Entity (validator-rejected, not a 500).',
        );
    }

    public function testPostWithNonJsonContentTypeIsRejected(): void
    {
        $this->login();

        $this->client->request(
            'POST',
            '/api/scenarios',
            ['name' => 'Holiday Fund'],
        );

        self::assertSame(
            415,
            $this->client->getResponse()->getStatusCode(),
            'POST /api/scenarios without a JSON Content-Type must be rejected with 415 Unsupported Media Type.',
        );

        $this->em->clear();

        $persisted = $this->em->getRepository(Scenario::class)->findOneBy(['name' => 'Holiday Fund']);

        self::assertNull(
            $persisted,
            'A rejected non-JSON POST must not persist a Scenario.',
        );
    }
}