<?php

declare(strict_types=1);

namespace Tests\Feature\Auth;

use App\Enums\MfaMethod;
use App\Models\MfaEmailCode;
use App\Models\TrustedDevice;
use App\Models\User;
use App\Services\MfaService;
use Database\Seeders\RoleSeeder;
use Illuminate\Foundation\Testing\RefreshDatabase;
use PragmaRX\Google2FA\Google2FA;
use Tests\TestCase;

class MfaLoginFlowTest extends TestCase
{
    use RefreshDatabase;

    private Google2FA $google2fa;

    protected function setUp(): void
    {
        parent::setUp();
        $this->google2fa = new Google2FA();
    }

    public function test_login_without_mfa_returns_token_directly(): void
    {
        $user = User::factory()->create();

        $response = $this->postJson('/api/v1/auth/login', [
            'email' => $user->email,
            'password' => 'password',
        ]);

        $response->assertOk()
            ->assertJsonStructure([
                'success',
                'data' => ['user' => ['id', 'email']],
            ])
            ->assertJsonMissing(['mfa_required' => true]);
    }

    public function test_login_with_mfa_returns_mfa_required_response(): void
    {
        $user = $this->createUserWithTotp();

        $response = $this->postJson('/api/v1/auth/login', [
            'email' => $user->email,
            'password' => 'password',
        ]);

        $response->assertOk()
            ->assertJson(['mfa_required' => true])
            ->assertJsonStructure([
                'mfa_session_token',
                'methods',
                'preferred_method',
                'expires_in',
            ]);

        $this->assertContains('totp', $response->json('methods'));
        $this->assertContains('backup_code', $response->json('methods'));
    }

    public function test_login_with_trusted_device_skips_mfa(): void
    {
        $user = $this->createUserWithTotp();
        $fingerprint = 'trusted-device-fingerprint';

        // Trust the device
        app(MfaService::class)->trustDevice($user, $fingerprint, '127.0.0.1', 'Test Device');

        $response = $this->postJson('/api/v1/auth/login', [
            'email' => $user->email,
            'password' => 'password',
        ], ['X-Device-Fingerprint' => $fingerprint]);

        $response->assertOk()
            ->assertJsonStructure([
                'data' => ['user' => ['id', 'email']],
            ])
            ->assertJsonMissing(['mfa_required' => true]);
    }

    public function test_mfa_verify_totp_issues_token(): void
    {
        $user = $this->createUserWithTotp();
        $secret = decrypt($user->mfa_secret);

        // Login to get MFA session
        $loginResponse = $this->postJson('/api/v1/auth/login', [
            'email' => $user->email,
            'password' => 'password',
        ]);

        $sessionToken = $loginResponse->json('mfa_session_token');
        $validCode = $this->google2fa->getCurrentOtp($secret);

        $response = $this->postJson('/api/v1/auth/mfa/verify', [
            'mfa_session_token' => $sessionToken,
            'code' => $validCode,
            'method' => 'totp',
        ]);

        $response->assertOk()
            ->assertJsonStructure([
                'data' => ['user' => ['id', 'email']],
            ]);
    }

    public function test_mfa_verify_email_code_issues_token(): void
    {
        $user = User::factory()->create([
            'mfa_enabled' => true,
            'mfa_method' => MfaMethod::EMAIL->value,
            'mfa_confirmed_at' => now(),
        ]);

        // Login to get MFA session
        $loginResponse = $this->postJson('/api/v1/auth/login', [
            'email' => $user->email,
            'password' => 'password',
        ]);

        $sessionToken = $loginResponse->json('mfa_session_token');

        // Get the email code that was auto-sent
        $emailCode = MfaEmailCode::where('user_id', $user->id)
            ->where('used', false)
            ->first();

        $response = $this->postJson('/api/v1/auth/mfa/verify', [
            'mfa_session_token' => $sessionToken,
            'code' => $emailCode->code,
            'method' => 'email',
        ]);

        $response->assertOk()
            ->assertJsonStructure([
                'data' => ['user' => ['id', 'email']],
            ]);
    }

    public function test_mfa_verify_backup_code_issues_token(): void
    {
        $user = $this->createUserWithTotp();

        // Get a backup code
        $backupCode = \App\Models\MfaBackupCode::where('user_id', $user->id)
            ->where('used', false)
            ->first();

        // We need to know the plain code, so regenerate
        $plainCodes = app(MfaService::class)->regenerateBackupCodes($user);

        $loginResponse = $this->postJson('/api/v1/auth/login', [
            'email' => $user->email,
            'password' => 'password',
        ]);

        $sessionToken = $loginResponse->json('mfa_session_token');

        $response = $this->postJson('/api/v1/auth/mfa/verify', [
            'mfa_session_token' => $sessionToken,
            'code' => $plainCodes[0],
            'method' => 'backup_code',
        ]);

        $response->assertOk()
            ->assertJsonStructure([
                'data' => ['user' => ['id', 'email']],
            ]);
    }

    public function test_mfa_verify_with_trust_device_creates_trusted_device(): void
    {
        $user = $this->createUserWithTotp();
        $secret = decrypt($user->mfa_secret);

        $loginResponse = $this->postJson('/api/v1/auth/login', [
            'email' => $user->email,
            'password' => 'password',
        ]);

        $sessionToken = $loginResponse->json('mfa_session_token');
        $validCode = $this->google2fa->getCurrentOtp($secret);

        $response = $this->postJson('/api/v1/auth/mfa/verify', [
            'mfa_session_token' => $sessionToken,
            'code' => $validCode,
            'method' => 'totp',
            'trust_device' => true,
            'device_fingerprint' => 'my-device-fp',
            'device_name' => 'Test Browser',
        ]);

        $response->assertOk();

        $this->assertDatabaseHas('trusted_devices', [
            'user_id' => $user->id,
            'device_name' => 'Test Browser',
        ]);
    }

    public function test_mfa_verify_expired_session_fails(): void
    {
        $response = $this->postJson('/api/v1/auth/mfa/verify', [
            'mfa_session_token' => 'expired-token',
            'code' => '123456',
            'method' => 'totp',
        ]);

        $response->assertStatus(422)
            ->assertJson(['message' => 'MFA-sessie verlopen. Log opnieuw in.']);
    }

    public function test_mfa_verify_wrong_code_fails(): void
    {
        $user = $this->createUserWithTotp();

        $loginResponse = $this->postJson('/api/v1/auth/login', [
            'email' => $user->email,
            'password' => 'password',
        ]);

        $sessionToken = $loginResponse->json('mfa_session_token');

        $response = $this->postJson('/api/v1/auth/mfa/verify', [
            'mfa_session_token' => $sessionToken,
            'code' => '000000',
            'method' => 'totp',
        ]);

        $response->assertStatus(422)
            ->assertJson(['message' => 'Ongeldige verificatiecode.']);
    }

    public function test_login_mfa_required_but_not_setup_flags_setup_required(): void
    {
        $this->seed(RoleSeeder::class);

        $user = User::factory()->create();
        $user->assignRole('super_admin');

        $response = $this->postJson('/api/v1/auth/login', [
            'email' => $user->email,
            'password' => 'password',
        ]);

        $response->assertOk()
            ->assertJson(['mfa_setup_required' => true])
            ->assertJsonStructure([
                'data' => ['user' => ['id', 'email']],
            ]);
    }

    private function createUserWithTotp(): User
    {
        $user = User::factory()->create();
        $mfaService = app(MfaService::class);

        $setupResult = $mfaService->setupTotp($user);
        $secret = $setupResult['secret'];
        $validCode = $this->google2fa->getCurrentOtp($secret);
        $mfaService->confirmTotp($user, $validCode);

        return $user->refresh();
    }
}