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"""
Simplified integration tests for authentication flows
Focus on core functionality without complex session management
"""

import unittest
from unittest.mock import Mock, patch, MagicMock
from datetime import datetime
from bson import ObjectId
import json

# Import the Flask app and models
from app import app
from models import User, ChatSession


class TestSimpleAuthenticationFlows(unittest.TestCase):
    """Simplified integration tests for authentication flows"""
    
    def setUp(self):
        """Set up test client"""
        self.app = app
        self.app.config['TESTING'] = True
        self.app.config['WTF_CSRF_ENABLED'] = False
        self.app.config['SECRET_KEY'] = 'test-secret-key'
        
        self.client = self.app.test_client()
        
        self.test_user_data = {
            '_id': ObjectId(),
            'email': 'test@example.com',
            'password_hash': 'hashed_password',
            'created_at': datetime.utcnow(),
            'is_active': True
        }
        
        self.test_user = User(self.test_user_data)
    
    def test_registration_form_display(self):
        """Test that registration form is displayed correctly"""
        response = self.client.get('/register')
        self.assertEqual(response.status_code, 200)
        self.assertIn(b'Create Account', response.data)
        self.assertIn(b'email', response.data)
        self.assertIn(b'password', response.data)
    
    def test_login_form_display(self):
        """Test that login form is displayed correctly"""
        response = self.client.get('/login')
        self.assertEqual(response.status_code, 200)
        self.assertIn(b'Login to Chatty', response.data)
        self.assertIn(b'email', response.data)
        self.assertIn(b'password', response.data)
    
    def test_registration_with_valid_data(self):
        """Test registration with valid data"""
        with patch('models.get_users_collection') as mock_users_collection, \
             patch('models.User.find_by_email') as mock_find_by_email, \
             patch('models.User.validate_email_format', return_value=True), \
             patch('models.User.validate_password_strength', return_value=True):
            
            # Setup mocks
            mock_collection = Mock()
            mock_users_collection.return_value = mock_collection
            mock_find_by_email.return_value = None  # User doesn't exist
            mock_collection.insert_one.return_value = Mock(inserted_id=self.test_user_data['_id'])
            mock_collection.find_one.return_value = self.test_user_data
            
            registration_data = {
                'email': 'test@example.com',
                'password': 'password123',
                'confirm_password': 'password123'
            }
            
            response = self.client.post('/register', data=registration_data, follow_redirects=False)
            
            # Should redirect to login page
            self.assertEqual(response.status_code, 302)
            self.assertIn('/login', response.location)
    
    def test_registration_with_mismatched_passwords(self):
        """Test registration with mismatched passwords"""
        registration_data = {
            'email': 'test@example.com',
            'password': 'password123',
            'confirm_password': 'different_password'
        }
        
        response = self.client.post('/register', data=registration_data)
        
        # Should stay on registration page with error
        self.assertEqual(response.status_code, 200)
        self.assertIn(b'Passwords do not match', response.data)
    
    def test_login_with_valid_credentials(self):
        """Test login with valid credentials"""
        with patch('models.User.find_by_email') as mock_find_by_email, \
             patch.object(User, 'check_password', return_value=True):
            
            mock_find_by_email.return_value = self.test_user
            
            login_data = {
                'email': 'test@example.com',
                'password': 'password123'
            }
            
            response = self.client.post('/login', data=login_data, follow_redirects=False)
            
            # Should redirect to chat interface
            self.assertEqual(response.status_code, 302)
            self.assertIn('/chat', response.location)
    
    def test_login_with_invalid_credentials(self):
        """Test login with invalid credentials"""
        with patch('models.User.find_by_email') as mock_find_by_email:
            mock_find_by_email.return_value = None  # User doesn't exist
            
            login_data = {
                'email': 'nonexistent@example.com',
                'password': 'password123'
            }
            
            response = self.client.post('/login', data=login_data)
            
            # Should stay on login page with error
            self.assertEqual(response.status_code, 200)
            self.assertIn(b'Invalid email or password', response.data)
    
    def test_unauthenticated_access_to_chat_redirects(self):
        """Test that unauthenticated users are redirected from chat page"""
        response = self.client.get('/chat', follow_redirects=False)
        
        # Should redirect to login
        self.assertEqual(response.status_code, 302)
        self.assertIn('/login', response.location)
    
    def test_unauthenticated_api_chat_request(self):
        """Test that unauthenticated API requests are rejected"""
        chat_data = {
            'message': 'Hello, this should fail'
        }
        
        response = self.client.post(
            '/api/chat',
            data=json.dumps(chat_data),
            content_type='application/json'
        )
        
        # Should return 401 or redirect
        self.assertIn(response.status_code, [401, 302])
    
    def test_unauthenticated_history_request(self):
        """Test that unauthenticated history requests are rejected"""
        response = self.client.get('/api/user-history')
        
        # Should return 401 or redirect
        self.assertIn(response.status_code, [401, 302])
    
    def test_root_route_redirects_to_login_when_unauthenticated(self):
        """Test that root route redirects to login for unauthenticated users"""
        response = self.client.get('/', follow_redirects=False)
        
        self.assertEqual(response.status_code, 302)
        self.assertIn('/login', response.location)
    
    def test_database_error_handling_in_login(self):
        """Test graceful handling of database errors during login"""
        with patch('models.User.find_by_email') as mock_find_by_email:
            mock_find_by_email.side_effect = Exception("Database connection failed")
            
            login_data = {
                'email': 'test@example.com',
                'password': 'password123'
            }
            
            response = self.client.post('/login', data=login_data)
            
            # Should handle error gracefully
            self.assertEqual(response.status_code, 200)
            self.assertIn(b'We're experiencing technical difficulties', response.data)
    
    def test_database_error_handling_in_registration(self):
        """Test graceful handling of database errors during registration"""
        with patch('models.User.create_user') as mock_create_user:
            mock_create_user.side_effect = Exception("Database connection failed")
            
            registration_data = {
                'email': 'test@example.com',
                'password': 'password123',
                'confirm_password': 'password123'
            }
            
            response = self.client.post('/register', data=registration_data)
            
            # Should handle error gracefully
            self.assertEqual(response.status_code, 200)
            self.assertIn(b'We're experiencing technical difficulties', response.data)
    
    def test_weak_password_validation(self):
        """Test that weak passwords are rejected"""
        registration_data = {
            'email': 'test@example.com',
            'password': 'weak',  # Too short
            'confirm_password': 'weak'
        }
        
        response = self.client.post('/register', data=registration_data)
        
        # Should stay on registration page with error
        self.assertEqual(response.status_code, 200)
        self.assertIn(b'Password must be at least 8 characters long', response.data)
    
    def test_invalid_email_format_validation(self):
        """Test that invalid email formats are rejected"""
        registration_data = {
            'email': 'invalid_email',  # Invalid format
            'password': 'password123',
            'confirm_password': 'password123'
        }
        
        response = self.client.post('/register', data=registration_data)
        
        # Should stay on registration page with error
        self.assertEqual(response.status_code, 200)
        self.assertIn(b'Please enter a valid email address', response.data)
    
    def test_existing_email_registration_attempt(self):
        """Test registration attempt with existing email"""
        with patch('models.User.find_by_email') as mock_find_by_email, \
             patch('models.User.validate_email_format', return_value=True), \
             patch('models.User.validate_password_strength', return_value=True):
            
            # User already exists
            mock_find_by_email.return_value = self.test_user
            
            registration_data = {
                'email': 'test@example.com',
                'password': 'password123',
                'confirm_password': 'password123'
            }
            
            response = self.client.post('/register', data=registration_data)
            
            # Should stay on registration page with error
            self.assertEqual(response.status_code, 200)
            self.assertIn(b'Email already registered', response.data)
    
    def test_login_with_wrong_password(self):
        """Test login with correct email but wrong password"""
        with patch('models.User.find_by_email') as mock_find_by_email, \
             patch.object(User, 'check_password', return_value=False):
            
            mock_find_by_email.return_value = self.test_user
            
            login_data = {
                'email': 'test@example.com',
                'password': 'wrongpassword'
            }
            
            response = self.client.post('/login', data=login_data)
            
            # Should stay on login page with error
            self.assertEqual(response.status_code, 200)
            self.assertIn(b'Invalid email or password', response.data)
    
    def test_login_with_inactive_user(self):
        """Test login attempt with inactive user account"""
        # Create inactive user
        inactive_user_data = self.test_user_data.copy()
        inactive_user_data['is_active'] = False
        inactive_user = User(inactive_user_data)
        
        with patch('models.User.find_by_email') as mock_find_by_email:
            mock_find_by_email.return_value = inactive_user
            
            login_data = {
                'email': 'test@example.com',
                'password': 'password123'
            }
            
            response = self.client.post('/login', data=login_data)
            
            # Should stay on login page with error
            self.assertEqual(response.status_code, 200)
            self.assertIn(b'disabled', response.data)


if __name__ == '__main__':
    unittest.main(verbosity=2)