<?php

use App\Enums\SocialProvider;
use App\Models\SocialAccount;
use App\Models\User;
use App\Services\AppleIdentityTokenVerifier;
use App\Services\AppleOAuthTokenClient;
use App\Services\SocialAuthenticationNonce;
use App\Services\SocialIdentityResolver;
use Firebase\JWT\JWT;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Http\Client\Request as ClientRequest;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\RateLimiter;
use Laravel\Socialite\Contracts\Factory as SocialiteFactory;
use Laravel\Socialite\Two\AbstractProvider;
use Laravel\Socialite\Two\User as SocialiteUser;
use Mockery\MockInterface;
use Symfony\Component\HttpKernel\Exception\HttpException;

uses(RefreshDatabase::class);

beforeEach(function () {
    RateLimiter::clear('ip:127.0.0.1');
});

function bindResolvedSocialIdentity(array $attributes, int $times = 1): void
{
    $identity = SocialiteUser::fake(array_merge([
        'email_verified' => true,
    ], $attributes));
    $resolver = Mockery::mock(SocialIdentityResolver::class);
    $resolver->shouldReceive('resolve')->times($times)->andReturn($identity);

    app()->instance(SocialIdentityResolver::class, $resolver);
}

function socialLoginPayload(array $overrides = []): array
{
    return array_merge([
        'deviceName' => 'Bowli iOS',
        'idToken' => 'provider-id-token',
        'intent' => 'register',
        'locale' => 'fr-FR',
        'nonce' => str_repeat('a', 64),
        'provider' => SocialProvider::Google->value,
        'termsAccepted' => true,
    ], $overrides);
}

function bindAppleTokenExchange(string $subject, array $refreshTokens): void
{
    $client = Mockery::mock(AppleOAuthTokenClient::class);
    $client->shouldReceive('exchangeAuthorizationCode')
        ->times(count($refreshTokens))
        ->withArgs(fn (string $authorizationCode, string $expectedSubject): bool => $authorizationCode !== ''
            && $expectedSubject === $subject)
        ->andReturn(...$refreshTokens);

    app()->instance(AppleOAuthTokenClient::class, $client);
}

function configureAppleOAuthClient(): string
{
    $key = openssl_pkey_new([
        'curve_name' => 'prime256v1',
        'private_key_type' => OPENSSL_KEYTYPE_EC,
    ]);

    if ($key === false || ! openssl_pkey_export($key, $privateKey)) {
        throw new RuntimeException('Unable to generate an Apple OAuth test key.');
    }

    config()->set([
        'services.apple.client_id' => 'com.meal.daily',
        'services.apple.issuer' => 'https://appleid.apple.com',
        'services.apple.key_id' => 'APPLEKEY1',
        'services.apple.private_key' => $privateKey,
        'services.apple.private_key_base64' => null,
        'services.apple.team_id' => 'TEAMID1234',
    ]);

    return $privateKey;
}

it('creates a verified mobile account from a Google identity', function () {
    bindResolvedSocialIdentity([
        'id' => 'google-user-123',
        'name' => 'Camille Martin',
        'email' => 'Camille@example.com',
    ]);

    $this->postJson('/api/auth/mobile/social', socialLoginPayload())
        ->assertOk()
        ->assertJsonPath('user.email', 'camille@example.com')
        ->assertJsonPath('user.emailVerified', true)
        ->assertJsonPath('user.locale', 'fr')
        ->assertJsonPath('user.name', 'camille.martin')
        ->assertJsonStructure(['token']);

    $user = User::where('email', 'camille@example.com')->firstOrFail();

    expect($user->password)->toBeNull()
        ->and($user->terms_accepted_at)->not->toBeNull();

    $this->assertDatabaseHas('social_accounts', [
        'provider' => SocialProvider::Google->value,
        'provider_user_id' => 'google-user-123',
        'user_id' => $user->getKey(),
    ]);
    $this->assertDatabaseHas('personal_access_tokens', [
        'name' => 'Bowli iOS',
        'tokenable_id' => $user->getKey(),
    ]);

    $this->postJson('/api/auth/mobile/login', [
        'email' => $user->email,
        'password' => 'not-a-social-password',
    ])
        ->assertUnauthorized()
        ->assertJsonPath('code', 'INVALID_CREDENTIALS');
});

it('reuses the same account on subsequent social logins', function () {
    bindResolvedSocialIdentity([
        'id' => 'google-returning-user',
        'name' => 'Returning User',
        'email' => 'returning@example.com',
    ], 2);

    $firstUserId = $this->postJson('/api/auth/mobile/social', socialLoginPayload())
        ->assertOk()
        ->json('user.id');

    $this->postJson('/api/auth/mobile/social', socialLoginPayload([
        'intent' => 'login',
        'locale' => 'en-US',
        'termsAccepted' => false,
    ]))
        ->assertOk()
        ->assertJsonPath('user.id', $firstUserId)
        ->assertJsonPath('user.locale', 'en');

    expect(User::count())->toBe(1)
        ->and(SocialAccount::count())->toBe(1);
});

it('links a verified social identity to an existing email account', function () {
    $user = User::factory()->create([
        'email' => 'existing@example.com',
    ]);
    $password = $user->password;

    bindResolvedSocialIdentity([
        'id' => 'google-existing-user',
        'name' => 'Different Provider Name',
        'email' => 'existing@example.com',
    ]);

    $this->postJson('/api/auth/mobile/social', socialLoginPayload([
        'intent' => 'login',
        'termsAccepted' => false,
    ]))
        ->assertOk()
        ->assertJsonPath('user.id', $user->getKey());

    expect($user->fresh()->password)->toBe($password)
        ->and($user->socialAccounts()->count())->toBe(1);
});

it('keeps the Apple name received only during the first authorization', function () {
    bindResolvedSocialIdentity([
        'id' => 'apple-user-123',
        'name' => null,
        'email' => 'relay@privaterelay.appleid.com',
    ], 2);
    bindAppleTokenExchange('apple-user-123', [
        'apple-refresh-token-1',
        'apple-refresh-token-2',
    ]);

    $payload = socialLoginPayload([
        'authorizationCode' => 'authorization-code-1',
        'name' => 'Alex Dupont',
        'nonce' => str_repeat('a', 64),
        'provider' => SocialProvider::Apple->value,
    ]);

    $this->postJson('/api/auth/mobile/social', $payload)
        ->assertOk()
        ->assertJsonPath('user.name', 'alex.dupont');

    unset($payload['name']);
    $payload['authorizationCode'] = 'authorization-code-2';
    $payload['intent'] = 'login';
    $payload['termsAccepted'] = false;

    $this->postJson('/api/auth/mobile/social', $payload)
        ->assertOk()
        ->assertJsonPath('user.name', 'alex.dupont');

    $socialAccount = SocialAccount::query()->firstOrFail();

    expect($socialAccount->provider_refresh_token)->toBe('apple-refresh-token-2')
        ->and($socialAccount->getRawOriginal('provider_refresh_token'))->not->toBe('apple-refresh-token-2')
        ->and($socialAccount->toArray())->not->toHaveKey('provider_refresh_token');
});

it('requires an authorization code for Apple authentication', function () {
    $this->postJson('/api/auth/mobile/social', socialLoginPayload([
        'provider' => SocialProvider::Apple->value,
    ]))
        ->assertUnprocessable()
        ->assertJsonValidationErrors('authorizationCode');
});

it('creates an unknown account from the login intent', function () {
    bindResolvedSocialIdentity([
        'id' => 'unknown-google-user',
        'name' => 'Unknown Google User',
        'email' => 'unknown@example.com',
    ]);

    $this->postJson('/api/auth/mobile/social', socialLoginPayload([
        'intent' => 'login',
        'termsAccepted' => true,
    ]))
        ->assertOk()
        ->assertJsonPath('user.name', 'unknown.google.user')
        ->assertJsonStructure(['token']);

    $user = User::query()->where('email', 'unknown@example.com')->firstOrFail();

    expect($user->terms_accepted_at)->not->toBeNull()
        ->and($user->socialAccounts)->toHaveCount(1);

    $this->assertDatabaseHas('social_accounts', [
        'provider' => SocialProvider::Google->value,
        'provider_user_id' => 'unknown-google-user',
        'user_id' => $user->getKey(),
    ]);
});

it('requires terms acceptance before creating a social account', function () {
    bindResolvedSocialIdentity([
        'id' => 'terms-google-user',
        'email' => 'terms@example.com',
    ]);

    $this->postJson('/api/auth/mobile/social', socialLoginPayload([
        'intent' => 'login',
        'termsAccepted' => false,
    ]))
        ->assertUnprocessable()
        ->assertJsonPath('code', 'TERMS_ACCEPTANCE_REQUIRED');

    expect(User::count())->toBe(0);
});

it('generates a unique username when the Google name is already taken', function () {
    User::factory()->create([
        'name' => 'camille.martin',
        'email' => 'existing-name@example.com',
    ]);

    bindResolvedSocialIdentity([
        'id' => 'google-duplicate-name',
        'name' => 'Camille Martin',
        'email' => 'new-camille@example.com',
    ]);

    $response = $this->postJson('/api/auth/mobile/social', socialLoginPayload([
        'intent' => 'login',
        'termsAccepted' => true,
    ]));

    $response->assertOk();

    $generatedName = $response->json('user.name');

    expect($generatedName)
        ->not->toBe('camille.martin')
        ->toStartWith('camille.martin-');
});

it('rejects an identity whose provider email is not verified', function () {
    bindResolvedSocialIdentity([
        'id' => 'unverified-google-user',
        'email' => 'unverified@example.com',
        'email_verified' => false,
    ]);

    $this->postJson('/api/auth/mobile/social', socialLoginPayload())
        ->assertUnauthorized()
        ->assertJsonPath('code', 'SOCIAL_EMAIL_NOT_VERIFIED');
});

it('returns a safe error for an invalid provider token', function () {
    $this->mock(
        SocialIdentityResolver::class,
        function (MockInterface $mock): void {
            $mock->shouldReceive('resolve')
                ->once()
                ->andThrow(new HttpException(401, 'SOCIAL_TOKEN_INVALID'));
        },
    );

    $this->postJson('/api/auth/mobile/social', socialLoginPayload())
        ->assertUnauthorized()
        ->assertJsonPath('code', 'SOCIAL_TOKEN_INVALID');
});

it('validates nonce input before resolving the identity', function () {
    $this->postJson('/api/auth/mobile/social', socialLoginPayload([
        'nonce' => null,
    ]))
        ->assertUnprocessable()
        ->assertJsonValidationErrors('nonce');
});

it('issues provider-specific nonces', function () {
    Cache::flush();

    $googleNonce = $this->postJson('/api/auth/mobile/social/nonce', [
        'provider' => SocialProvider::Google->value,
    ])
        ->assertOk()
        ->assertJsonStructure(['nonce'])
        ->json('nonce');
    $appleNonce = $this->postJson('/api/auth/mobile/social/nonce', [
        'provider' => SocialProvider::Apple->value,
    ])
        ->assertOk()
        ->json('nonce');

    expect($googleNonce)->toBeString()->toHaveLength(64)
        ->and($appleNonce)->toBeString()->toHaveLength(64)
        ->and($googleNonce)->not->toBe($appleNonce);
});

it('uses a nonce only with the provider it was issued for', function () {
    Cache::flush();
    $nonceService = app(SocialAuthenticationNonce::class);
    $nonce = $nonceService->issue(SocialProvider::Google);

    expect($nonceService->consume(SocialProvider::Apple, $nonce, $nonce))->toBeFalse()
        ->and($nonceService->consume(SocialProvider::Google, $nonce, $nonce))->toBeTrue()
        ->and($nonceService->consume(SocialProvider::Google, $nonce, $nonce))->toBeFalse();
});

it('requires the issued nonce in the Google identity token', function () {
    Cache::flush();
    config()->set('services.google.client_id', 'google-web-client-id');

    $nonceService = app(SocialAuthenticationNonce::class);
    $nonce = $nonceService->issue(SocialProvider::Google);
    $identity = SocialiteUser::fake([
        'email' => 'google@example.com',
        'email_verified' => true,
        'nonce' => $nonce,
    ]);
    $provider = Mockery::mock(AbstractProvider::class);
    $provider->shouldReceive('userFromToken')->twice()->andReturn($identity);
    $socialite = Mockery::mock(SocialiteFactory::class);
    $socialite->shouldReceive('driver')->with('google')->twice()->andReturn($provider);
    $resolver = new SocialIdentityResolver(
        $socialite,
        app(AppleIdentityTokenVerifier::class),
        $nonceService,
    );

    expect($resolver->resolve(SocialProvider::Google, 'google-id-token', $nonce))
        ->toBe($identity);

    try {
        $resolver->resolve(SocialProvider::Google, 'google-id-token', $nonce);
        $this->fail('The Google nonce should only be accepted once.');
    } catch (HttpException $exception) {
        expect($exception->getStatusCode())->toBe(401)
            ->and($exception->getMessage())->toBe('SOCIAL_TOKEN_INVALID');
    }
});

it('issues a single-use nonce and verifies Apple JWT claims', function () {
    Cache::flush();
    config()->set('services.apple.client_ids', 'com.meal.daily');

    $key = openssl_pkey_new([
        'digest_alg' => 'sha256',
        'private_key_bits' => 2048,
        'private_key_type' => OPENSSL_KEYTYPE_RSA,
    ]);
    openssl_pkey_export($key, $privateKey);
    $details = openssl_pkey_get_details($key);
    $jwk = [
        'alg' => 'RS256',
        'e' => rtrim(strtr(base64_encode($details['rsa']['e']), '+/', '-_'), '='),
        'kid' => 'apple-test-key',
        'kty' => 'RSA',
        'n' => rtrim(strtr(base64_encode($details['rsa']['n']), '+/', '-_'), '='),
        'use' => 'sig',
    ];

    Http::fake([
        'https://appleid.apple.com/auth/keys' => Http::response(['keys' => [$jwk]]),
    ]);

    $verifier = app(AppleIdentityTokenVerifier::class);
    $nonce = app(SocialAuthenticationNonce::class)->issue(SocialProvider::Apple);
    $token = JWT::encode([
        'aud' => 'com.meal.daily',
        'email' => 'apple@example.com',
        'email_verified' => 'true',
        'exp' => now()->addMinutes(5)->timestamp,
        'iat' => now()->timestamp,
        'iss' => 'https://appleid.apple.com',
        'nonce' => $nonce,
        'sub' => 'apple-subject',
    ], $privateKey, 'RS256', 'apple-test-key');

    $identity = $verifier->userFromToken($token, $nonce);

    expect($identity->getId())->toBe('apple-subject')
        ->and($identity->getEmail())->toBe('apple@example.com');

    try {
        $verifier->userFromToken($token, $nonce);
        $this->fail('The Apple nonce should only be accepted once.');
    } catch (HttpException $exception) {
        expect($exception->getStatusCode())->toBe(401)
            ->and($exception->getMessage())->toBe('SOCIAL_TOKEN_INVALID');
    }
});

it('exchanges the Apple authorization code for a verified refresh token', function () {
    configureAppleOAuthClient();
    Http::preventStrayRequests();
    Http::fake([
        'https://appleid.apple.com/auth/token' => Http::response([
            'access_token' => 'apple-access-token',
            'expires_in' => 3600,
            'id_token' => 'returned-identity-token',
            'refresh_token' => 'apple-refresh-token',
            'token_type' => 'Bearer',
        ]),
    ]);

    $identityTokenVerifier = Mockery::mock(AppleIdentityTokenVerifier::class);
    $identityTokenVerifier->shouldReceive('subjectFromToken')
        ->once()
        ->with('returned-identity-token')
        ->andReturn('apple-user-123');
    $client = new AppleOAuthTokenClient($identityTokenVerifier);

    expect($client->exchangeAuthorizationCode('authorization-code', 'apple-user-123'))
        ->toBe('apple-refresh-token');

    Http::assertSent(function (ClientRequest $request): bool {
        $data = $request->data();
        $clientSecret = $data['client_secret'] ?? null;

        if (! is_string($clientSecret)) {
            return false;
        }

        $segments = explode('.', $clientSecret);

        if (count($segments) !== 3) {
            return false;
        }

        $header = (array) JWT::jsonDecode(JWT::urlsafeB64Decode($segments[0]));
        $claims = (array) JWT::jsonDecode(JWT::urlsafeB64Decode($segments[1]));

        return $request->url() === 'https://appleid.apple.com/auth/token'
            && $request->isForm()
            && ($data['client_id'] ?? null) === 'com.meal.daily'
            && ($data['code'] ?? null) === 'authorization-code'
            && ($data['grant_type'] ?? null) === 'authorization_code'
            && ($header['alg'] ?? null) === 'ES256'
            && ($header['kid'] ?? null) === 'APPLEKEY1'
            && ($claims['aud'] ?? null) === 'https://appleid.apple.com'
            && ($claims['iss'] ?? null) === 'TEAMID1234'
            && ($claims['sub'] ?? null) === 'com.meal.daily';
    });
});

it('rejects an invalid Apple authorization code', function () {
    configureAppleOAuthClient();
    Http::preventStrayRequests();
    Http::fake([
        'https://appleid.apple.com/auth/token' => Http::response([
            'error' => 'invalid_grant',
        ], 400),
    ]);

    $identityTokenVerifier = Mockery::mock(AppleIdentityTokenVerifier::class);
    $client = new AppleOAuthTokenClient($identityTokenVerifier);

    try {
        $client->exchangeAuthorizationCode('expired-code', 'apple-user-123');
        $this->fail('The expired Apple authorization code should be rejected.');
    } catch (HttpException $exception) {
        expect($exception->getStatusCode())->toBe(401)
            ->and($exception->getMessage())->toBe('SOCIAL_AUTHORIZATION_CODE_INVALID');
    }
});