<?php

namespace App\Tests\Functional;

use App\Entity\Bucket;
use App\Entity\Scenario;
use App\Entity\User;
use App\Enum\BucketAllocationType;
use App\Enum\BucketType;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Bundle\FrameworkBundle\KernelBrowser;
use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\PasswordHasher\Hasher\NativePasswordHasher;
use Symfony\Component\PasswordHasher\Hasher\PasswordHasherFactory;
use Symfony\Component\PasswordHasher\Hasher\UserPasswordHasher;

final class BucketApiTest extends WebTestCase
{
    private const EMAIL = 'bucket-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 Bucket API.',
        );
    }

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

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

        return $scenario;
    }

    private function persistBucket(Scenario $scenario, string $name, int $priority): Bucket
    {
        $bucket = new Bucket();
        $bucket->setScenario($scenario);
        $bucket->setName($name);
        $bucket->setPriority($priority);

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

        return $bucket;
    }

    private function scenarioIri(Scenario $scenario): string
    {
        return '/api/scenarios/'.$scenario->getId();
    }

    /**
     * Asserts that the JSON-LD 422 response body contains a Hydra
     * ConstraintViolationList violation at the given propertyPath, pinning
     * down WHICH validator rejected the request (not just that *some*
     * validator did).
     */
    private function assertHasViolationAt(string $propertyPath, Response $response): void
    {
        $body = json_decode((string) $response->getContent(), true);

        self::assertIsArray($body, 'The 422 response must be a JSON-LD object.');
        self::assertArrayHasKey(
            'violations',
            $body,
            'A 422 validation failure must expose a Hydra ConstraintViolationList violations array.',
        );

        $paths = array_column($body['violations'], 'propertyPath');

        self::assertContains(
            $propertyPath,
            $paths,
            \sprintf(
                'Expected a violation at propertyPath "%s", got: %s',
                $propertyPath,
                json_encode($paths),
            ),
        );
    }

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

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

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

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

    public function testGetCollectionReturnsPersistedBucketsWhenAuthenticated(): void
    {
        $scenario = $this->persistScenario('Household Budget');
        $this->persistBucket($scenario, 'Rent', 1);
        $this->persistBucket($scenario, 'Groceries', 2);

        $this->login();

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

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

        self::assertSame(
            200,
            $response->getStatusCode(),
            'GET /api/buckets 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('Rent', $names);
        self::assertContains('Groceries', $names);
    }

    public function testGetItemReturnsTheBucketWhenAuthenticated(): void
    {
        $scenario = $this->persistScenario('Household Budget');
        $bucket = $this->persistBucket($scenario, 'Rent', 1);

        $this->login();

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

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

        self::assertSame(
            200,
            $response->getStatusCode(),
            'GET /api/buckets/{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('Bucket', $body['@type'] ?? null, 'The item @type must be Bucket.');
        self::assertSame('Rent', $body['name'] ?? null);
    }

    public function testPostCreatesABucketWhenAuthenticatedAndResolvesScenarioIri(): void
    {
        $scenario = $this->persistScenario('Household Budget');

        $this->login();

        $this->client->request(
            'POST',
            '/api/buckets',
            server: [
                'CONTENT_TYPE' => 'application/ld+json',
                'HTTP_ACCEPT' => 'application/ld+json',
            ],
            content: json_encode([
                'scenario' => $this->scenarioIri($scenario),
                'name' => 'Groceries',
                'priority' => 1,
            ]),
        );

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

        self::assertSame(
            201,
            $response->getStatusCode(),
            'POST /api/buckets 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('Groceries', $body['name'] ?? null);

        $this->em->clear();

        $persisted = $this->em->getRepository(Bucket::class)->findOneBy(['name' => 'Groceries']);

        self::assertNotNull(
            $persisted,
            'A successful POST /api/buckets must persist the new Bucket to the database.',
        );
        self::assertSame(
            $scenario->getId()->toRfc4122(),
            $persisted->getScenario()->getId()->toRfc4122(),
            'The persisted Bucket must resolve its scenario relation from the posted IRI.',
        );
    }

    public function testPostWithIncompatibleAllocationTypeIsRejectedAsUnprocessable(): void
    {
        $scenario = $this->persistScenario('Household Budget');

        $this->login();

        $this->client->request(
            'POST',
            '/api/buckets',
            server: [
                'CONTENT_TYPE' => 'application/ld+json',
                'HTTP_ACCEPT' => 'application/ld+json',
            ],
            content: json_encode([
                'scenario' => $this->scenarioIri($scenario),
                'name' => 'Bad Overflow',
                'priority' => 1,
                'type' => BucketType::OVERFLOW->value,
                'allocationType' => BucketAllocationType::FIXED_LIMIT->value,
            ]),
        );

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

        self::assertSame(
            422,
            $response->getStatusCode(),
            'POST /api/buckets with an overflow bucket using a non-unlimited allocation type must be rejected by the CompatibleAllocationType validator (422, not 500).',
        );

        $this->assertHasViolationAt('allocationType', $response);
    }

    public function testPostWithSecondOverflowBucketOnSameScenarioIsRejectedAsUnprocessable(): void
    {
        $scenario = $this->persistScenario('Household Budget');

        $existingOverflow = new Bucket();
        $existingOverflow->setScenario($scenario);
        $existingOverflow->setName('Overflow');
        $existingOverflow->setPriority(1);
        $existingOverflow->setType(BucketType::OVERFLOW);
        $existingOverflow->setAllocationType(BucketAllocationType::UNLIMITED);

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

        $this->login();

        $this->client->request(
            'POST',
            '/api/buckets',
            server: [
                'CONTENT_TYPE' => 'application/ld+json',
                'HTTP_ACCEPT' => 'application/ld+json',
            ],
            content: json_encode([
                'scenario' => $this->scenarioIri($scenario),
                'name' => 'Second Overflow',
                'priority' => 2,
                'type' => BucketType::OVERFLOW->value,
                'allocationType' => BucketAllocationType::UNLIMITED->value,
            ]),
        );

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

        self::assertSame(
            422,
            $response->getStatusCode(),
            'POST /api/buckets adding a second overflow bucket to a scenario that already has one must be rejected by the SingleOverflowPerScenario validator (422, not 500).',
        );

        $this->assertHasViolationAt('type', $response);
    }

    public function testPostWithBufferOnNonFixedLimitBucketIsRejectedAsUnprocessable(): void
    {
        $scenario = $this->persistScenario('Household Budget');

        $this->login();

        $this->client->request(
            'POST',
            '/api/buckets',
            server: [
                'CONTENT_TYPE' => 'application/ld+json',
                'HTTP_ACCEPT' => 'application/ld+json',
            ],
            content: json_encode([
                'scenario' => $this->scenarioIri($scenario),
                'name' => 'Wants',
                'priority' => 1,
                'type' => BucketType::WANT->value,
                'allocationType' => BucketAllocationType::PERCENTAGE->value,
                'allocationValue' => 2000,
                'bufferMultiplier' => '1.50',
            ]),
        );

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

        self::assertSame(
            422,
            $response->getStatusCode(),
            'POST /api/buckets with a non-zero buffer on a non-fixed-limit bucket must be rejected by the BufferOnlyForFixedLimit validator (422, not 500).',
        );

        $this->assertHasViolationAt('bufferMultiplier', $response);
    }

    public function testPostWithMissingNameIsRejectedAsUnprocessable(): void
    {
        $scenario = $this->persistScenario('Household Budget');

        $this->login();

        $this->client->request(
            'POST',
            '/api/buckets',
            server: [
                'CONTENT_TYPE' => 'application/ld+json',
                'HTTP_ACCEPT' => 'application/ld+json',
            ],
            content: json_encode([
                'scenario' => $this->scenarioIri($scenario),
                'priority' => 1,
            ]),
        );

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

    public function testPostWithMissingPriorityIsRejectedAsUnprocessable(): void
    {
        $scenario = $this->persistScenario('Household Budget');

        $this->login();

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

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

        self::assertSame(
            422,
            $response->getStatusCode(),
            'POST /api/buckets without a priority must return 422 Unprocessable Entity (validator-rejected, not a 500).',
        );

        $this->assertHasViolationAt('priority', $response);
    }

    public function testGetItemIsRejectedWhenUnauthenticated(): void
    {
        $scenario = $this->persistScenario('Household Budget');
        $bucket = $this->persistBucket($scenario, 'Rent', 1);

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

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

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

        $this->client->request(
            'POST',
            '/api/buckets',
            ['name' => 'Groceries'],
        );

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

        $this->em->clear();

        $persisted = $this->em->getRepository(Bucket::class)->findOneBy(['name' => 'Groceries']);

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