<?php

namespace App\Tests\Functional;

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 AuthenticationTest extends WebTestCase
{
    private const EMAIL = 'auth-test@example.com';
    private const PASSWORD = 'correct-horse-battery-staple';

    private KernelBrowser $client;

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

        // Persist a user with a properly hashed password before each test.
        // Reuse the direct-factory pattern from UserPersistenceTest — avoids
        // the container chicken-and-egg during Kernel compile, and cost:4
        // keeps the test suite fast.
        $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));

        /** @var EntityManagerInterface $em */
        $em = static::getContainer()->get(EntityManagerInterface::class);
        $em->persist($user);
        $em->flush();
    }

    // -------------------------------------------------------------------------
    // Test 2: json_login happy path — valid credentials yield a session cookie
    // -------------------------------------------------------------------------

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

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

        self::assertLessThan(
            300,
            $loginResponse->getStatusCode(),
            'A successful login must return a 2xx response.',
        );

        $setCookieHeader = $loginResponse->headers->get('Set-Cookie');

        self::assertNotNull(
            $setCookieHeader,
            'A successful login must set a Set-Cookie header.',
        );

        self::assertMatchesRegularExpression(
            '/HttpOnly/i',
            $setCookieHeader,
            'The session cookie must be HttpOnly.',
        );

        self::assertMatchesRegularExpression(
            '/SameSite=Lax/i',
            $setCookieHeader,
            'The session cookie must carry SameSite=Lax.',
        );

        // --- Login response body contract ---
        // Capture before the follow-up /api/me request replaces the client's response.
        $loginBody = json_decode((string) $loginResponse->getContent(), true);

        self::assertIsArray($loginBody, 'The login response must be a JSON object.');

        self::assertArrayHasKey('email', $loginBody, 'The login response must include the email field.');
        self::assertSame(self::EMAIL, $loginBody['email'], 'The login response must return the authenticated user\'s email.');

        self::assertArrayHasKey('id', $loginBody, 'The login response must include the id (uuid) field.');
        self::assertMatchesRegularExpression(
            '/^[0-9a-f]{8}-[0-9a-f]{4}-7[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i',
            (string) $loginBody['id'],
            'The login response id must be a valid UUIDv7.',
        );

        // Password hash must NEVER appear in the login response.
        $loginResponseText = (string) $loginResponse->getContent();
        self::assertStringNotContainsString(
            '$2',
            $loginResponseText,
            'The login response must never expose a bcrypt hash (starts with $2).',
        );
        self::assertStringNotContainsString(
            '$argon',
            $loginResponseText,
            'The login response must never expose an Argon2 hash (starts with $argon).',
        );

        // Exact shape: only 'id' and 'email' — no extra fields (kills 'message'/'path' junk keys).
        $keys = array_keys($loginBody);
        sort($keys);
        self::assertSame(
            ['email', 'id'],
            $keys,
            'The login response body must contain EXACTLY the keys [email, id] — no more, no less.',
        );

        // The cookie issued must actually authenticate — not just exist.
        // Same client carries the cookie jar; no re-login needed.
        $this->client->jsonRequest('GET', '/api/me');

        self::assertSame(
            200,
            $this->client->getResponse()->getStatusCode(),
            'The session cookie set by login must authenticate a follow-up request to /api/me.',
        );
    }

    // -------------------------------------------------------------------------
    // Test 3: json_login sad path — wrong password yields 401, no session
    // -------------------------------------------------------------------------

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

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

        self::assertSame(
            401,
            $response->getStatusCode(),
            'An invalid password must return 401 Unauthorized.',
        );

        // A failed login must NOT leave the client holding an authenticating session.
        // We assert this at the causal level: the browser cookie jar must be empty
        // after a failed login attempt on a fresh client. If a buggy implementation
        // issued a real session cookie on bad credentials, the jar would be non-empty
        // and this assertion would catch it — something the /api/me 401 check alone
        // cannot do (a 401 there could be explained by other reasons even with a
        // session cookie present, e.g. a cookie that exists but is invalid).
        $cookies = $this->client->getCookieJar()->all();

        self::assertEmpty(
            $cookies,
            'A failed login must not set any cookies — the browser cookie jar must remain empty.',
        );

        // Belt-and-suspenders: even if the jar were somehow populated, /api/me
        // must still refuse. This check is now meaningful because it follows the
        // causal assertion above rather than standing alone.
        $this->client->jsonRequest('GET', '/api/me');

        self::assertSame(
            401,
            $this->client->getResponse()->getStatusCode(),
            'After a failed login the client must not hold an authenticated session.',
        );
    }

    // -------------------------------------------------------------------------
    // Test 5: /api/me is behind the firewall — unauthenticated access → 401
    // -------------------------------------------------------------------------

    public function testItReturns401OnMeWhenNotAuthenticated(): void
    {
        // Fresh client — no login, no cookie.
        $this->client->jsonRequest('GET', '/api/me');

        self::assertSame(
            401,
            $this->client->getResponse()->getStatusCode(),
            '/api/me must return 401 when no session is present.',
        );
    }

    // -------------------------------------------------------------------------
    // Test 6: authenticated /api/me returns identity (no password hash);
    //         logout then invalidates the session
    // -------------------------------------------------------------------------

    public function testItReturnsCurrentUserOnMeAndLogoutClearsTheSession(): void
    {
        // --- Step 1: log in ---
        $this->client->jsonRequest('POST', '/api/login', [
            'username' => self::EMAIL,
            'password' => self::PASSWORD,
        ]);

        self::assertLessThan(
            300,
            $this->client->getResponse()->getStatusCode(),
            'Login must succeed before testing /api/me.',
        );

        // --- Step 2: GET /api/me while authenticated ---
        $this->client->jsonRequest('GET', '/api/me');

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

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

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

        self::assertIsArray($body, '/api/me must return a JSON object.');

        self::assertArrayHasKey('email', $body, '/api/me response must include the email field.');
        self::assertSame(self::EMAIL, $body['email'], '/api/me must return the authenticated user\'s email.');

        self::assertArrayHasKey('id', $body, '/api/me response must include the id (uuid) field.');
        self::assertMatchesRegularExpression(
            '/^[0-9a-f]{8}-[0-9a-f]{4}-7[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i',
            (string) $body['id'],
            '/api/me id must be a valid UUIDv7.',
        );

        // Password hash must NEVER appear in the response — check all values recursively.
        $responseText = (string) $meResponse->getContent();
        self::assertStringNotContainsString(
            '$2',
            $responseText,
            '/api/me must never expose a bcrypt hash (starts with $2).',
        );
        self::assertStringNotContainsString(
            '$argon',
            $responseText,
            '/api/me must never expose an Argon2 hash (starts with $argon).',
        );

        // --- Step 3: logout ---
        $this->client->jsonRequest('POST', '/api/logout');

        // Capture the logout response immediately — before the next request overwrites it.
        $logoutResponse = $this->client->getResponse();

        self::assertSame(
            204,
            $logoutResponse->getStatusCode(),
            'POST /api/logout must return 204 No Content — not a redirect.',
        );

        self::assertSame(
            '',
            $logoutResponse->getContent(),
            'A 204 response must have an empty body.',
        );

        // --- Step 4: /api/me must be 401 again ---
        $this->client->jsonRequest('GET', '/api/me');

        self::assertSame(
            401,
            $this->client->getResponse()->getStatusCode(),
            '/api/me must return 401 after logout — the session must be invalidated.',
        );
    }
}