"""
Integration tests for Flask routes
"""
import pytest
import json
import tempfile
import os
from unittest.mock import patch, Mock
from io import BytesIO
from werkzeug.datastructures import FileStorage


class TestMainRoutes:
    """Integration tests for main application routes."""
    
    def test_index_get_basic(self, client):
        """Test basic GET request to index."""
        response = client.get('/')
        
        assert response.status_code == 200
        assert b'Tokenizer Pro' in response.data
        assert b'Advanced tokenization analysis' in response.data
        assert b'textarea' in response.data
    
    def test_index_get_with_parameters(self, client):
        """Test GET request with query parameters."""
        response = client.get('/?model=gpt2&model_type=predefined')
        
        assert response.status_code == 200
        assert b'gpt2' in response.data or b'GPT-2' in response.data
    
    @patch('app.services.tokenizer_service.tokenizer_service')
    @patch('app.services.file_service.file_service')
    def test_index_post_text_analysis(self, mock_file_service, mock_tokenizer_service, client):
        """Test POST request with text analysis."""
        # Mock services
        mock_tokenizer_service.TOKENIZER_MODELS = {'gpt2': {'name': 'gpt2', 'alias': 'GPT-2'}}
        
        mock_file_service.process_text_for_tokenization.return_value = {
            'tokens': [
                {
                    'display': 'Hello',
                    'original': 'Hello',
                    'token_id': 15496,
                    'colors': {'background': '#FF5733', 'text': '#FFFFFF'},
                    'newline': False
                }
            ],
            'stats': {
                'basic_stats': {
                    'total_tokens': 1,
                    'unique_tokens': 1,
                    'unique_percentage': '100.0',
                    'special_tokens': 0,
                    'space_tokens': 0,
                    'newline_tokens': 0,
                    'compression_ratio': '5.0'
                },
                'length_stats': {
                    'avg_length': '5.0',
                    'median_length': '5.0',
                    'std_dev': '0.0'
                }
            },
            'display_limit_reached': False,
            'total_tokens': 1,
            'preview_only': False,
            'tokenizer_info': {
                'vocab_size': 50257,
                'tokenizer_type': 'GPT2TokenizerFast'
            }
        }
        
        response = client.post('/', data={
            'text': 'Hello',
            'model': 'gpt2',
            'model_type': 'predefined'
        })
        
        assert response.status_code == 200
        mock_file_service.process_text_for_tokenization.assert_called_once()
    
    @patch('app.services.tokenizer_service.tokenizer_service')
    @patch('app.services.file_service.file_service')
    def test_index_post_ajax_request(self, mock_file_service, mock_tokenizer_service, client):
        """Test AJAX POST request for text analysis."""
        # Mock services
        mock_tokenizer_service.TOKENIZER_MODELS = {'gpt2': {'name': 'gpt2', 'alias': 'GPT-2'}}
        
        expected_response = {
            'tokens': [],
            'stats': {'basic_stats': {}, 'length_stats': {}},
            'display_limit_reached': False,
            'total_tokens': 0
        }
        mock_file_service.process_text_for_tokenization.return_value = expected_response
        
        response = client.post('/', 
            data={'text': 'Test', 'model': 'gpt2', 'model_type': 'predefined'},
            headers={'X-Requested-With': 'XMLHttpRequest'}
        )
        
        assert response.status_code == 200
        assert response.content_type == 'application/json'
        
        data = json.loads(response.data)
        assert 'tokens' in data
        assert 'stats' in data
    
    @patch('app.services.file_service.file_service')
    @patch('app.services.tokenizer_service.tokenizer_service')
    def test_index_post_file_upload(self, mock_tokenizer_service, mock_file_service, client, app):
        """Test POST request with file upload."""
        with app.app_context():
            # Mock services
            mock_tokenizer_service.TOKENIZER_MODELS = {'gpt2': {'name': 'gpt2', 'alias': 'GPT-2'}}
            
            # Mock file processing
            mock_file_service.save_uploaded_file.return_value = '/tmp/test_file.txt'
            mock_file_service.process_file_for_tokenization.return_value = {
                'tokens': [],
                'stats': {'basic_stats': {}, 'length_stats': {}},
                'display_limit_reached': False,
                'total_tokens': 0,
                'preview_only': True
            }
            mock_file_service.cleanup_file.return_value = None
            
            # Create test file data
            file_data = BytesIO(b"Hello world! This is a test file.")
            
            response = client.post('/', 
                data={
                    'file': (file_data, 'test.txt'),
                    'model': 'gpt2',
                    'model_type': 'predefined'
                },
                content_type='multipart/form-data'
            )
            
            assert response.status_code == 200
            mock_file_service.save_uploaded_file.assert_called_once()
            mock_file_service.process_file_for_tokenization.assert_called_once()
            mock_file_service.cleanup_file.assert_called_once()
    
    @patch('app.utils.validators.validators')
    def test_index_post_validation_error(self, mock_validators, client):
        """Test POST request with validation error."""
        from app.utils.validators import ValidationError
        
        # Mock validation to raise error
        mock_validators.validate_text_input.side_effect = ValidationError("Invalid input")
        
        response = client.post('/', 
            data={'text': 'Invalid text', 'model': 'gpt2'},
            headers={'X-Requested-With': 'XMLHttpRequest'}
        )
        
        assert response.status_code == 400
        data = json.loads(response.data)
        assert 'error' in data
        assert 'Invalid input' in data['error']
    
    def test_index_post_empty_data(self, client):
        """Test POST request with empty data."""
        response = client.post('/', data={})
        
        assert response.status_code == 200
        # Should return the form again without processing


class TestTokenizerInfoRoute:
    """Integration tests for tokenizer info route."""
    
    @patch('app.services.tokenizer_service.tokenizer_service')
    def test_tokenizer_info_predefined_model(self, mock_tokenizer_service, client):
        """Test tokenizer info for predefined model."""
        # Mock service
        mock_tokenizer_service.is_predefined_model.return_value = True
        mock_tokenizer_service.load_tokenizer.return_value = (
            Mock(), 
            {
                'vocab_size': 50257,
                'tokenizer_type': 'GPT2TokenizerFast',
                'model_max_length': 1024,
                'special_tokens': {'eos_token': '</s>'}
            },
            None
        )
        
        response = client.get('/tokenizer-info?model_id=gpt2&is_custom=false')
        
        assert response.status_code == 200
        assert response.content_type == 'application/json'
        
        data = json.loads(response.data)
        assert 'vocab_size' in data
        assert 'tokenizer_type' in data
        assert data['vocab_size'] == 50257
    
    @patch('app.services.tokenizer_service.tokenizer_service')
    @patch('app.utils.validators.validators')
    def test_tokenizer_info_custom_model(self, mock_validators, mock_tokenizer_service, client):
        """Test tokenizer info for custom model."""
        # Mock validation
        mock_validators.validate_model_path.return_value = None
        
        # Mock service
        mock_tokenizer_service.is_predefined_model.return_value = False
        mock_tokenizer_service.load_tokenizer.return_value = (
            Mock(),
            {
                'vocab_size': 32000,
                'tokenizer_type': 'LlamaTokenizerFast',
                'special_tokens': {}
            },
            None
        )
        
        response = client.get('/tokenizer-info?model_id=meta-llama/Llama-2-7b-hf&is_custom=true')
        
        assert response.status_code == 200
        data = json.loads(response.data)
        assert data['vocab_size'] == 32000
    
    def test_tokenizer_info_missing_model_id(self, client):
        """Test tokenizer info without model_id."""
        response = client.get('/tokenizer-info')
        
        assert response.status_code == 400
        data = json.loads(response.data)
        assert 'error' in data
        assert 'No model ID provided' in data['error']
    
    @patch('app.utils.validators.validators')
    def test_tokenizer_info_validation_error(self, mock_validators, client):
        """Test tokenizer info with validation error."""
        from app.utils.validators import ValidationError
        
        # Mock validation to raise error
        mock_validators.validate_model_path.side_effect = ValidationError("Invalid model path")
        
        response = client.get('/tokenizer-info?model_id=invalid/path&is_custom=true')
        
        assert response.status_code == 400
        data = json.loads(response.data)
        assert 'error' in data
        assert 'Invalid model path' in data['error']
    
    @patch('app.services.tokenizer_service.tokenizer_service')
    def test_tokenizer_info_service_error(self, mock_tokenizer_service, client):
        """Test tokenizer info with service error."""
        # Mock service to return error
        mock_tokenizer_service.is_predefined_model.return_value = True
        mock_tokenizer_service.load_tokenizer.return_value = (None, {}, "Failed to load tokenizer")
        
        response = client.get('/tokenizer-info?model_id=gpt2&is_custom=false')
        
        assert response.status_code == 400
        data = json.loads(response.data)
        assert 'error' in data
        assert 'Failed to load tokenizer' in data['error']


class TestHealthCheckRoutes:
    """Integration tests for health check routes."""
    
    def test_basic_health_check(self, client):
        """Test basic health check endpoint."""
        response = client.get('/health')
        
        assert response.status_code == 200
        assert response.content_type == 'application/json'
        
        data = json.loads(response.data)
        assert 'status' in data
        assert 'timestamp' in data
        assert 'version' in data
        assert data['status'] == 'healthy'
    
    @patch('app.services.tokenizer_service.tokenizer_service')
    @patch('psutil.cpu_percent')
    @patch('psutil.virtual_memory')
    @patch('psutil.disk_usage')
    def test_detailed_health_check(self, mock_disk, mock_memory, mock_cpu, mock_tokenizer_service, client):
        """Test detailed health check endpoint."""
        # Mock system info
        mock_cpu.return_value = 25.5
        mock_memory.return_value = Mock(total=8000000000, available=4000000000, percent=50.0, used=4000000000)
        mock_disk.return_value = Mock(total=100000000000, used=50000000000, free=50000000000)
        
        # Mock tokenizer service
        mock_tokenizer_service.tokenizers = {}
        mock_tokenizer_service.custom_tokenizers = {}
        mock_tokenizer_service.TOKENIZER_MODELS = {'gpt2': {}}
        mock_tokenizer_service.load_tokenizer.return_value = (Mock(), {}, None)
        
        response = client.get('/health/detailed')
        
        assert response.status_code == 200
        data = json.loads(response.data)
        
        assert 'status' in data
        assert 'system' in data
        assert 'services' in data
        assert 'configuration' in data
        
        # Check system info
        assert 'cpu_percent' in data['system']
        assert 'memory' in data['system']
        assert 'disk' in data['system']
        
        # Check services info
        assert 'tokenizer_service' in data['services']
        assert 'file_service' in data['services']
    
    @patch('app.services.tokenizer_service.tokenizer_service')
    def test_readiness_check_ready(self, mock_tokenizer_service, client, app):
        """Test readiness check when application is ready."""
        with app.app_context():
            # Mock successful tokenizer loading
            mock_tokenizer_service.load_tokenizer.return_value = (Mock(), {}, None)
            
            response = client.get('/health/ready')
            
            assert response.status_code == 200
            data = json.loads(response.data)
            
            assert 'ready' in data
            assert 'checks' in data
            assert isinstance(data['checks'], dict)
    
    @patch('app.services.tokenizer_service.tokenizer_service')
    def test_readiness_check_not_ready(self, mock_tokenizer_service, client):
        """Test readiness check when application is not ready."""
        # Mock failed tokenizer loading
        mock_tokenizer_service.load_tokenizer.return_value = (None, {}, "Failed to load")
        
        response = client.get('/health/ready')
        
        assert response.status_code == 503
        data = json.loads(response.data)
        
        assert data['ready'] is False
        assert 'checks' in data


class TestErrorHandling:
    """Test error handling across routes."""
    
    def test_404_handling(self, client):
        """Test 404 error handling."""
        response = client.get('/nonexistent-route')
        assert response.status_code == 404
    
    def test_405_method_not_allowed(self, client):
        """Test 405 error for wrong HTTP method."""
        response = client.put('/')  # PUT not allowed
        assert response.status_code == 405
    
    @patch('app.services.tokenizer_service.tokenizer_service')
    def test_500_internal_error(self, mock_tokenizer_service, client):
        """Test 500 error handling."""
        # Mock service to raise unexpected exception
        mock_tokenizer_service.TOKENIZER_MODELS = {'gpt2': {'name': 'gpt2', 'alias': 'GPT-2'}}
        
        with patch('app.services.file_service.file_service') as mock_file_service:
            mock_file_service.process_text_for_tokenization.side_effect = Exception("Unexpected error")
            
            response = client.post('/', 
                data={'text': 'Test', 'model': 'gpt2', 'model_type': 'predefined'},
                headers={'X-Requested-With': 'XMLHttpRequest'}
            )
            
            assert response.status_code == 400  # Our app returns 400 for processing errors
            data = json.loads(response.data)
            assert 'error' in data


class TestSecurityFeatures:
    """Test security features in routes."""
    
    @patch('app.utils.validators.validators')
    def test_malicious_filename_blocked(self, mock_validators, client):
        """Test that malicious filenames are blocked."""
        from app.utils.validators import ValidationError
        
        # Mock validation to detect malicious filename
        mock_validators.validate_filename.side_effect = ValidationError("Malicious filename detected")
        
        file_data = BytesIO(b"test content")
        
        response = client.post('/', 
            data={
                'file': (file_data, '../../../etc/passwd'),
                'model': 'gpt2',
                'model_type': 'predefined'
            },
            content_type='multipart/form-data',
            headers={'X-Requested-With': 'XMLHttpRequest'}
        )
        
        assert response.status_code == 400
        data = json.loads(response.data)
        assert 'error' in data
    
    @patch('app.utils.validators.validators')
    def test_malicious_model_path_blocked(self, mock_validators, client):
        """Test that malicious model paths are blocked."""
        from app.utils.validators import ValidationError
        
        # Mock validation to detect malicious model path
        mock_validators.validate_model_path.side_effect = ValidationError("Untrusted model path")
        
        response = client.post('/', 
            data={
                'text': 'Test',
                'custom_model': 'malicious/backdoor-model',
                'model_type': 'custom'
            },
            headers={'X-Requested-With': 'XMLHttpRequest'}
        )
        
        assert response.status_code == 400
        data = json.loads(response.data)
        assert 'error' in data
        assert 'Untrusted model path' in data['error']