<?php

namespace App\Tests\Functional;

use App\Entity\Bucket;
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 ScenarioOwnerApiTest extends WebTestCase
{
    private const EMAIL = 'scenario-owner-api-test@example.com';
    private const PASSWORD = 'correct-horse-battery-staple';

    private const OTHER_EMAIL = 'scenario-owner-api-spoof-target@example.com';

    private KernelBrowser $client;
    private EntityManagerInterface $em;
    private User $caller;
    private User $otherUser;

    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);

        $this->caller = new User();
        $this->caller->setEmail(self::EMAIL);
        $this->caller->setPassword($hasher->hashPassword($this->caller, self::PASSWORD));
        $this->em->persist($this->caller);

        $this->otherUser = new User();
        $this->otherUser->setEmail(self::OTHER_EMAIL);
        $this->otherUser->setPassword($hasher->hashPassword($this->otherUser, 'some-other-password'));
        $this->em->persist($this->otherUser);

        $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(User $owner, string $name): Scenario
    {
        $scenario = new Scenario();
        $scenario->setName($name);
        $scenario->setOwner($owner);

        $this->em->persist($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;
    }

    public function testPostCreatesAScenarioOwnedByTheAuthenticatedUser(): 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']),
        );

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

        $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.');
        self::assertTrue(
            $this->caller->getId()->equals($persisted->getOwner()->getId()),
            'The persisted Scenario must be owned by the authenticated caller, not left null or assigned elsewhere.',
        );
    }

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

        $this->client->request(
            'POST',
            '/api/scenarios',
            server: [
                'CONTENT_TYPE' => 'application/ld+json',
                'HTTP_ACCEPT' => 'application/ld+json',
            ],
            content: json_encode([
                'name' => 'Spoofed Owner Fund',
                'owner' => '/api/users/'.$this->otherUser->getId(),
            ]),
        );

        self::assertSame(
            201,
            $this->client->getResponse()->getStatusCode(),
            'POST /api/scenarios with a valid body must return 201 Created even when a client-supplied owner is present in the payload.',
        );

        $this->em->clear();

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

        self::assertNotNull($persisted, 'A successful POST /api/scenarios must persist the new Scenario.');
        self::assertTrue(
            $this->caller->getId()->equals($persisted->getOwner()->getId()),
            'A client-supplied owner in the request body must be ignored — the owner must always be the authenticated caller.',
        );
        self::assertFalse(
            $this->otherUser->getId()->equals($persisted->getOwner()->getId()),
            'The spoofed owner IRI in the request body must never be honoured.',
        );
    }

    public function testGetItemOnAScenarioOwnedBySomeoneElseReturnsNotFound(): void
    {
        $othersScenario = new Scenario();
        $othersScenario->setName('Someone Else\'s Fund');
        $othersScenario->setOwner($this->otherUser);
        $this->em->persist($othersScenario);
        $this->em->flush();

        $this->login();

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

        self::assertSame(
            404,
            $this->client->getResponse()->getStatusCode(),
            'GET /api/scenarios/{id} for a scenario owned by another user must return 404, not 403 — no existence oracle for scenarios you do not own.',
        );
    }

    public function testGetItemOnAScenarioOwnedBySomeoneElseReturnsNotFoundWithNoBucketLeak(): void
    {
        $othersScenario = $this->persistScenario($this->otherUser, 'Someone Else\'s Fund');
        $this->persistBucket($othersScenario, 'Their Rent', 1);
        $this->persistBucket($othersScenario, 'Their Groceries', 2);

        $this->login();

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

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

        self::assertSame(
            404,
            $response->getStatusCode(),
            'GET /api/scenarios/{id} for a scenario owned by another user must return 404, even when it has buckets.',
        );

        $content = (string) $response->getContent();

        self::assertStringNotContainsString(
            'Their Rent',
            $content,
            'A 404 for a foreign scenario must not leak any of its embedded bucket data in the response body.',
        );
        self::assertStringNotContainsString(
            'Their Groceries',
            $content,
            'A 404 for a foreign scenario must not leak any of its embedded bucket data in the response body.',
        );
    }

    public function testEmbeddedBucketsContainOnlyThisScenariosBuckets(): void
    {
        $scenarioA = $this->persistScenario($this->caller, 'Scenario A');
        $this->persistBucket($scenarioA, 'A Rent', 1);
        $this->persistBucket($scenarioA, 'A Groceries', 2);

        $scenarioB = $this->persistScenario($this->caller, 'Scenario B');
        $this->persistBucket($scenarioB, 'B Rent', 1);
        $this->persistBucket($scenarioB, 'B Groceries', 2);

        $this->login();

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

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

        self::assertSame(200, $response->getStatusCode());

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

        self::assertIsArray($body, 'The item response must be a JSON-LD object.');
        self::assertIsArray($body['buckets'] ?? null);

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

        self::assertContains('A Rent', $names, 'Scenario A\'s item must embed its own buckets.');
        self::assertContains('A Groceries', $names, 'Scenario A\'s item must embed its own buckets.');

        self::assertNotContains(
            'B Rent',
            $names,
            'Scenario A\'s embedded buckets must never include another scenario\'s buckets, even when both '
            .'scenarios are owned by the same caller.',
        );
        self::assertNotContains(
            'B Groceries',
            $names,
            'Scenario A\'s embedded buckets must never include another scenario\'s buckets, even when both '
            .'scenarios are owned by the same caller.',
        );
    }

    public function testGetCollectionOnlyReturnsScenariosOwnedByTheCaller(): void
    {
        $mine = new Scenario();
        $mine->setName('My Fund');
        $mine->setOwner($this->caller);
        $this->em->persist($mine);

        $othersScenario = new Scenario();
        $othersScenario->setName('Someone Else\'s Fund');
        $othersScenario->setOwner($this->otherUser);
        $this->em->persist($othersScenario);

        $this->em->flush();

        $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(
            'My Fund',
            $names,
            'GET /api/scenarios must include scenarios owned by the authenticated caller.',
        );
        self::assertNotContains(
            'Someone Else\'s Fund',
            $names,
            'GET /api/scenarios must NOT include scenarios owned by other users.',
        );
    }

    public function testAnonymousGetCollectionIsRejectedRatherThanReturningUnfilteredScenarios(): void
    {
        // The ownership extension no-ops for anonymous requests (no user to scope to),
        // so the resource-level `is_granted('ROLE_USER')` security MUST reject the
        // request before the query runs. If that wall ever relaxes, an anonymous caller
        // would receive an unfiltered listing — this test fails closed if that happens.
        $othersScenario = new Scenario();
        $othersScenario->setName('Someone Else\'s Fund');
        $othersScenario->setOwner($this->otherUser);
        $this->em->persist($othersScenario);
        $this->em->flush();

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

        self::assertSame(
            401,
            $this->client->getResponse()->getStatusCode(),
            'GET /api/scenarios without authentication must be rejected by the security layer, not served an unfiltered collection.',
        );
    }

    public function testAnonymousGetItemIsRejectedRatherThanResolvingScenario(): void
    {
        $othersScenario = new Scenario();
        $othersScenario->setName('Someone Else\'s Fund');
        $othersScenario->setOwner($this->otherUser);
        $this->em->persist($othersScenario);
        $this->em->flush();

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

        self::assertSame(
            401,
            $this->client->getResponse()->getStatusCode(),
            'GET /api/scenarios/{id} without authentication must be rejected by the security layer.',
        );
    }

    public function testPostWithMissingNameIsStillRejectedAsUnprocessable(): 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 still return 422 Unprocessable Entity — the owner-setting persist processor must not interfere with existing validation order.',
        );
    }
}