/**
 * Tests for Logout and Token Verification Endpoints
 * Task 14: User Logout & Token Verification
 */

const request = require('supertest');
const app = require('../server');
const { User } = require('../models');
const jwt = require('jsonwebtoken');
const config = require('../config/config');

describe('POST /api/auth/logout', () => {
  test('Should logout successfully (stateless JWT approach)', async () => {
    const response = await request(app)
      .post('/api/auth/logout')
      .expect(200);

    expect(response.body.success).toBe(true);
    expect(response.body.message).toContain('Logout successful');
  });

  test('Should return success even without token (stateless approach)', async () => {
    // In a stateless JWT system, logout is client-side only
    const response = await request(app)
      .post('/api/auth/logout')
      .expect(200);

    expect(response.body.success).toBe(true);
  });
});

describe('GET /api/auth/verify', () => {
  let testUser;
  let validToken;

  beforeAll(async () => {
    // Create a test user
    testUser = await User.create({
      username: 'verifyuser',
      email: 'verify@test.com',
      password: 'Test@123',
      role: 'user'
    });

    // Generate valid token
    validToken = jwt.sign(
      {
        userId: testUser.id,
        email: testUser.email,
        username: testUser.username,
        role: testUser.role
      },
      config.jwt.secret,
      { expiresIn: config.jwt.expire }
    );
  });

  afterAll(async () => {
    // Cleanup
    if (testUser) {
      await testUser.destroy({ force: true });
    }
  });

  test('Should verify valid token and return user info', async () => {
    const response = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', `Bearer ${validToken}`)
      .expect(200);

    expect(response.body.success).toBe(true);
    expect(response.body.message).toBe('Token valid');
    expect(response.body.data.user).toBeDefined();
    expect(response.body.data.user.id).toBe(testUser.id);
    expect(response.body.data.user.email).toBe(testUser.email);
    expect(response.body.data.user.username).toBe(testUser.username);
    // Password should not be included
    expect(response.body.data.user.password).toBeUndefined();
  });

  test('Should reject request without token', async () => {
    const response = await request(app)
      .get('/api/auth/verify')
      .expect(401);

    expect(response.body.success).toBe(false);
    expect(response.body.message).toContain('No token provided');
  });

  test('Should reject invalid token', async () => {
    const response = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', 'Bearer invalid_token_here')
      .expect(401);

    expect(response.body.success).toBe(false);
    expect(response.body.message).toContain('Invalid token');
  });

  test('Should reject expired token', async () => {
    // Create an expired token
    const expiredToken = jwt.sign(
      {
        userId: testUser.id,
        email: testUser.email,
        username: testUser.username,
        role: testUser.role
      },
      config.jwt.secret,
      { expiresIn: '0s' } // Immediately expired
    );

    // Wait a moment to ensure expiration
    await new Promise(resolve => setTimeout(resolve, 1000));

    const response = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', `Bearer ${expiredToken}`)
      .expect(401);

    expect(response.body.success).toBe(false);
    expect(response.body.message).toContain('expired');
  });

  test('Should reject token with invalid format (no Bearer prefix)', async () => {
    const response = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', validToken) // Missing "Bearer " prefix
      .expect(401);

    expect(response.body.success).toBe(false);
  });

  test('Should reject token for inactive user', async () => {
    // Deactivate the user
    await testUser.update({ is_active: false });

    const response = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', `Bearer ${validToken}`)
      .expect(404);

    expect(response.body.success).toBe(false);
    expect(response.body.message).toContain('not found or inactive');

    // Reactivate for cleanup
    await testUser.update({ is_active: true });
  });

  test('Should reject token for non-existent user', async () => {
    // Create token with non-existent user ID
    const fakeToken = jwt.sign(
      {
        userId: '00000000-0000-0000-0000-000000000000',
        email: 'fake@test.com',
        username: 'fakeuser',
        role: 'user'
      },
      config.jwt.secret,
      { expiresIn: config.jwt.expire }
    );

    const response = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', `Bearer ${fakeToken}`)
      .expect(404);

    expect(response.body.success).toBe(false);
    expect(response.body.message).toContain('User not found');
  });

  test('Should handle malformed Authorization header', async () => {
    const response = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', 'InvalidFormat')
      .expect(401);

    expect(response.body.success).toBe(false);
  });
});

describe('Token Verification Integration Tests', () => {
  let registeredUser;
  let userToken;

  beforeAll(async () => {
    // Register a new user
    const registerResponse = await request(app)
      .post('/api/auth/register')
      .send({
        username: `integrationuser_${Date.now()}`,
        email: `integration_${Date.now()}@test.com`,
        password: 'Test@123'
      })
      .expect(201);

    registeredUser = registerResponse.body.data.user;
    userToken = registerResponse.body.data.token;
  });

  afterAll(async () => {
    // Cleanup
    if (registeredUser && registeredUser.id) {
      const user = await User.findByPk(registeredUser.id);
      if (user) {
        await user.destroy({ force: true });
      }
    }
  });

  test('Should verify token immediately after registration', async () => {
    const response = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', `Bearer ${userToken}`)
      .expect(200);

    expect(response.body.success).toBe(true);
    expect(response.body.data.user.id).toBe(registeredUser.id);
  });

  test('Should verify token after login', async () => {
    // Login with the registered user
    const loginResponse = await request(app)
      .post('/api/auth/login')
      .send({
        email: registeredUser.email,
        password: 'Test@123'
      })
      .expect(200);

    const loginToken = loginResponse.body.data.token;

    // Verify the login token
    const verifyResponse = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', `Bearer ${loginToken}`)
      .expect(200);

    expect(verifyResponse.body.success).toBe(true);
    expect(verifyResponse.body.data.user.id).toBe(registeredUser.id);
  });

  test('Should complete full auth flow: register -> verify -> logout', async () => {
    // 1. Register
    const registerResponse = await request(app)
      .post('/api/auth/register')
      .send({
        username: `flowuser_${Date.now()}`,
        email: `flow_${Date.now()}@test.com`,
        password: 'Test@123'
      })
      .expect(201);

    const token = registerResponse.body.data.token;
    const userId = registerResponse.body.data.user.id;

    // 2. Verify token
    const verifyResponse = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', `Bearer ${token}`)
      .expect(200);

    expect(verifyResponse.body.success).toBe(true);

    // 3. Logout
    const logoutResponse = await request(app)
      .post('/api/auth/logout')
      .expect(200);

    expect(logoutResponse.body.success).toBe(true);

    // 4. Token should still be valid (stateless JWT)
    // In a real app, client would delete the token
    const verifyAfterLogout = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', `Bearer ${token}`)
      .expect(200);

    expect(verifyAfterLogout.body.success).toBe(true);

    // Cleanup
    const user = await User.findByPk(userId);
    if (user) {
      await user.destroy({ force: true });
    }
  });
});

describe('Token Security Tests', () => {
  test('Should reject token signed with wrong secret', async () => {
    const fakeToken = jwt.sign(
      {
        userId: '12345',
        email: 'fake@test.com',
        username: 'fakeuser',
        role: 'user'
      },
      'wrong_secret_key',
      { expiresIn: '24h' }
    );

    const response = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', `Bearer ${fakeToken}`)
      .expect(401);

    expect(response.body.success).toBe(false);
    expect(response.body.message).toContain('Invalid token');
  });

  test('Should reject tampered token', async () => {
    // Create a valid token
    const validToken = jwt.sign(
      {
        userId: '12345',
        email: 'test@test.com',
        username: 'testuser',
        role: 'user'
      },
      config.jwt.secret,
      { expiresIn: '24h' }
    );

    // Tamper with the token by changing a character
    const tamperedToken = validToken.slice(0, -5) + 'XXXXX';

    const response = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', `Bearer ${tamperedToken}`)
      .expect(401);

    expect(response.body.success).toBe(false);
  });

  test('Should reject token with missing payload fields', async () => {
    // Create token with incomplete payload
    const incompleteToken = jwt.sign(
      {
        userId: '12345'
        // Missing email, username, role
      },
      config.jwt.secret,
      { expiresIn: '24h' }
    );

    const response = await request(app)
      .get('/api/auth/verify')
      .set('Authorization', `Bearer ${incompleteToken}`)
      .expect(404);

    // Token is valid but user doesn't exist
    expect(response.body.success).toBe(false);
  });
});