#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
Unit tests for the AI Review Service
"""

import unittest
from unittest.mock import patch, MagicMock
import os
import sys
from pathlib import Path

# Add the project root directory to the Python path
project_root = Path(__file__).resolve().parent.parent
sys.path.insert(0, str(project_root))

from src.mcp.ai_review import AIReviewService


class TestAIReviewService(unittest.TestCase):
    """Test cases for the AIReviewService class"""

    def setUp(self):
        """Set up test fixtures"""
        # Mock environment variables
        self.env_patcher = patch.dict('os.environ', {'ANTHROPIC_API_KEY': 'test_api_key'})
        self.env_patcher.start()
        
        # Create the service
        self.service = AIReviewService()
    
    def tearDown(self):
        """Tear down test fixtures"""
        self.env_patcher.stop()
    
    def test_init(self):
        """Test initialization of the service"""
        self.assertIsNotNone(self.service)
        self.assertEqual(self.service.api_key, 'test_api_key')
        self.assertTrue(self.service.is_available())
    
    def test_is_available(self):
        """Test is_available method"""
        # With API key
        self.assertTrue(self.service.is_available())
        
        # Without API key
        with patch.dict('os.environ', {}, clear=True):
            service = AIReviewService()
            self.assertFalse(service.is_available())
    
    @patch('anthropic.Anthropic')
    def test_review_code(self, mock_anthropic):
        """Test review_code method"""
        # Mock the Anthropic client
        mock_client = MagicMock()
        mock_anthropic.return_value = mock_client
        
        # Mock the response
        mock_response = MagicMock()
        mock_content = MagicMock()
        mock_content.text = "# Code Review\n\n## Code Quality\nThe code is well-structured.\n\n## Potential Issues\nLine 10: Variable 'x' is not used."
        mock_response.content = [mock_content]
        mock_client.messages.create.return_value = mock_response
        
        # Test the method
        result = self.service.review_code(
            file_path="test.py",
            file_content="def test():\n    x = 1\n    return 2",
            language="Python"
        )
        
        # Verify the result
        self.assertEqual(result['status'], 'success')
        self.assertEqual(result['review_text'], mock_content.text)
        self.assertIn('suggestions', result)
    
    @patch('anthropic.Anthropic')
    def test_review_code_error(self, mock_anthropic):
        """Test review_code method with error"""
        # Mock the Anthropic client
        mock_client = MagicMock()
        mock_anthropic.return_value = mock_client
        
        # Mock an error
        mock_client.messages.create.side_effect = Exception("API error")
        
        # Test the method
        result = self.service.review_code(
            file_path="test.py",
            file_content="def test():\n    return 1",
            language="Python"
        )
        
        # Verify the result
        self.assertEqual(result['status'], 'error')
        self.assertEqual(result['error'], 'API error')
        self.assertEqual(result['suggestions'], [])
    
    def test_review_code_unavailable(self):
        """Test review_code method when service is unavailable"""
        # Create a service without API key
        with patch.dict('os.environ', {}, clear=True):
            service = AIReviewService()
            
            # Test the method
            result = service.review_code(
                file_path="test.py",
                file_content="def test():\n    return 1",
                language="Python"
            )
            
            # Verify the result
            self.assertEqual(result['status'], 'error')
            self.assertIn('AI review service is not available', result['error'])
            self.assertEqual(result['suggestions'], [])
    
    @patch('anthropic.Anthropic')
    @patch('builtins.open', new_callable=unittest.mock.mock_open, read_data="def test():\n    return 1")
    def test_review_repository(self, mock_open, mock_anthropic):
        """Test review_repository method"""
        # Mock the Anthropic client
        mock_client = MagicMock()
        mock_anthropic.return_value = mock_client
        
        # Mock the response for file review
        mock_file_response = MagicMock()
        mock_file_content = MagicMock()
        mock_file_content.text = "# Code Review\n\n## Code Quality\nThe code is well-structured."
        mock_file_response.content = [mock_file_content]
        
        # Mock the response for repository summary
        mock_summary_response = MagicMock()
        mock_summary_content = MagicMock()
        mock_summary_content.text = "# Repository Review\n\nOverall, the code quality is good."
        mock_summary_response.content = [mock_summary_content]
        
        # Set up the mock to return different responses
        mock_client.messages.create.side_effect = [mock_file_response, mock_summary_response]
        
        # Test the method
        result = self.service.review_repository(
            repo_path="/test/repo",
            files=["test.py"],
            languages=["Python"]
        )
        
        # Verify the result
        self.assertEqual(result['status'], 'success')
        self.assertIn('reviews', result)
        self.assertIn('test.py', result['reviews'])
        self.assertEqual(result['summary'], mock_summary_content.text)
    
    def test_get_language_from_extension(self):
        """Test _get_language_from_extension method"""
        self.assertEqual(self.service._get_language_from_extension(".py"), "Python")
        self.assertEqual(self.service._get_language_from_extension(".js"), "JavaScript")
        self.assertEqual(self.service._get_language_from_extension(".ts"), "TypeScript")
        self.assertEqual(self.service._get_language_from_extension(".java"), "Java")
        self.assertEqual(self.service._get_language_from_extension(".go"), "Go")
        self.assertEqual(self.service._get_language_from_extension(".rs"), "Rust")
        self.assertIsNone(self.service._get_language_from_extension(".unknown"))


if __name__ == "__main__":
    unittest.main()