"""
Integration tests for Programming Assistance Features

Tests the integration of programming assistance features with the chat agent,
including end-to-end workflows for code explanation, debugging, error analysis,
code review, and beginner help.
"""

import unittest
from unittest.mock import Mock, patch, MagicMock
import pytest
from datetime import datetime

from chat_agent.services.chat_agent import ChatAgent
from chat_agent.services.programming_assistance import ProgrammingAssistanceService, AssistanceType
from chat_agent.services.groq_client import GroqClient, ChatMessage, LanguageContext
from chat_agent.services.language_context import LanguageContextManager
from chat_agent.services.session_manager import SessionManager
from chat_agent.services.chat_history import ChatHistoryManager
from chat_agent.models.message import Message
from chat_agent.models.chat_session import ChatSession


class TestProgrammingAssistanceIntegration(unittest.TestCase):
    """Integration test cases for programming assistance features."""
    
    def setUp(self):
        """Set up test fixtures with mocked dependencies."""
        # Mock dependencies
        self.mock_groq_client = Mock(spec=GroqClient)
        self.mock_language_context_manager = Mock(spec=LanguageContextManager)
        self.mock_session_manager = Mock(spec=SessionManager)
        self.mock_chat_history_manager = Mock(spec=ChatHistoryManager)
        
        # Create real programming assistance service
        self.programming_assistance_service = ProgrammingAssistanceService()
        
        # Create chat agent with mocked dependencies
        self.chat_agent = ChatAgent(
            groq_client=self.mock_groq_client,
            language_context_manager=self.mock_language_context_manager,
            session_manager=self.mock_session_manager,
            chat_history_manager=self.mock_chat_history_manager,
            programming_assistance_service=self.programming_assistance_service
        )
        
        # Common test data
        self.session_id = "test-session-123"
        self.test_session = Mock(spec=ChatSession)
        self.test_session.id = self.session_id
        self.test_session.language = "python"
        
        # Setup common mock returns
        self.mock_session_manager.get_session.return_value = self.test_session
        self.mock_language_context_manager.get_language.return_value = "python"
        self.mock_chat_history_manager.get_recent_history.return_value = []
        self.mock_groq_client.generate_response.return_value = "Mock LLM response"
        self.mock_groq_client.get_model_info.return_value = {"model": "test-model"}
        
        # Mock message storage
        mock_message = Mock(spec=Message)
        mock_message.id = "msg-123"
        self.mock_chat_history_manager.store_message.return_value = mock_message
    
    def test_process_programming_assistance_code_explanation(self):
        """Test processing code explanation request."""
        code = """
def greet(name):
    return f"Hello, {name}!"

print(greet("Alice"))
"""
        message = "Please explain this code"
        
        result = self.chat_agent.process_programming_assistance(
            self.session_id, message, code=code, 
            assistance_type=AssistanceType.CODE_EXPLANATION
        )
        
        # Verify result structure
        self.assertIn('response', result)
        self.assertIn('assistance_type', result)
        self.assertIn('analysis_result', result)
        self.assertEqual(result['assistance_type'], AssistanceType.CODE_EXPLANATION.value)
        self.assertEqual(result['language'], 'python')
        
        # Verify service calls
        self.mock_session_manager.get_session.assert_called_with(self.session_id)
        self.mock_session_manager.update_session_activity.assert_called_with(self.session_id)
        self.mock_language_context_manager.get_language.assert_called_with(self.session_id)
        
        # Verify message storage
        self.assertEqual(self.mock_chat_history_manager.store_message.call_count, 2)  # User + Assistant
        
        # Verify LLM call
        self.mock_groq_client.generate_response.assert_called_once()
    
    def test_process_programming_assistance_debugging(self):
        """Test processing debugging request."""
        code = """
def divide(a, b):
    return a / b

result = divide(10, 0)  # This will cause an error
"""
        error_message = "ZeroDivisionError: division by zero"
        message = "I'm getting an error with this code"
        
        result = self.chat_agent.process_programming_assistance(
            self.session_id, message, code=code, error_message=error_message,
            assistance_type=AssistanceType.DEBUGGING
        )
        
        # Verify result structure
        self.assertIn('response', result)
        self.assertEqual(result['assistance_type'], AssistanceType.DEBUGGING.value)
        self.assertIsNotNone(result['analysis_result'])
        
        # Verify analysis was performed
        analysis = result['analysis_result']
        self.assertIn('error_type', analysis.__dict__)
        self.assertIn('likely_causes', analysis.__dict__)
        self.assertIn('solutions', analysis.__dict__)
    
    def test_process_programming_assistance_error_analysis(self):
        """Test processing error analysis request."""
        error_message = "NameError: name 'undefined_variable' is not defined"
        message = "What does this error mean?"
        
        result = self.chat_agent.process_programming_assistance(
            self.session_id, message, error_message=error_message,
            assistance_type=AssistanceType.ERROR_ANALYSIS
        )
        
        # Verify result structure
        self.assertEqual(result['assistance_type'], AssistanceType.ERROR_ANALYSIS.value)
        
        # Verify error analysis was performed
        analysis = result['analysis_result']
        self.assertEqual(analysis.error_type, 'name_error')
        self.assertGreater(len(analysis.likely_causes), 0)
        self.assertGreater(len(analysis.solutions), 0)
    
    def test_process_programming_assistance_code_review(self):
        """Test processing code review request."""
        code = """
def calculate_total(items):
    total = 0
    for item in items:
        total = total + item
    return total

numbers = [1, 2, 3, 4, 5]
result = calculate_total(numbers)
print(result)
"""
        message = "Please review my code"
        
        result = self.chat_agent.process_programming_assistance(
            self.session_id, message, code=code,
            assistance_type=AssistanceType.CODE_REVIEW
        )
        
        # Verify result structure
        self.assertEqual(result['assistance_type'], AssistanceType.CODE_REVIEW.value)
        
        # Verify code analysis was performed
        analysis = result['analysis_result']
        self.assertEqual(analysis.language, 'python')
        self.assertIsInstance(analysis.suggestions, list)
        self.assertIsInstance(analysis.issues_found, list)
    
    def test_process_programming_assistance_beginner_help(self):
        """Test processing beginner help request."""
        message = "I'm new to programming. Can you explain variables?"
        
        result = self.chat_agent.process_programming_assistance(
            self.session_id, message, assistance_type=AssistanceType.BEGINNER_HELP
        )
        
        # Verify result structure
        self.assertEqual(result['assistance_type'], AssistanceType.BEGINNER_HELP.value)
        
        # Verify beginner explanation was generated
        self.assertIn('response', result)
        response = result['response']
        self.assertIn('variables', response.lower())
    
    def test_process_programming_assistance_auto_detection(self):
        """Test automatic assistance type detection."""
        # Test error detection
        result = self.chat_agent.process_programming_assistance(
            self.session_id, "I'm getting an error"
        )
        self.assertEqual(result['assistance_type'], AssistanceType.ERROR_ANALYSIS.value)
        
        # Test explanation detection with code
        code = "print('Hello')"
        result = self.chat_agent.process_programming_assistance(
            self.session_id, "What does this do?", code=code
        )
        self.assertEqual(result['assistance_type'], AssistanceType.CODE_EXPLANATION.value)
        
        # Test beginner detection
        result = self.chat_agent.process_programming_assistance(
            self.session_id, "I'm a beginner and need help"
        )
        self.assertEqual(result['assistance_type'], AssistanceType.BEGINNER_HELP.value)
    
    def test_explain_code_convenience_method(self):
        """Test the explain_code convenience method."""
        code = "x = [1, 2, 3]\nprint(len(x))"
        
        result = self.chat_agent.explain_code(self.session_id, code)
        
        self.assertEqual(result['assistance_type'], AssistanceType.CODE_EXPLANATION.value)
        self.assertIn('analysis_result', result)
    
    def test_debug_code_convenience_method(self):
        """Test the debug_code convenience method."""
        code = "print(undefined_var)"
        error_message = "NameError: name 'undefined_var' is not defined"
        
        result = self.chat_agent.debug_code(
            self.session_id, code, error_message, "Help me fix this error"
        )
        
        self.assertEqual(result['assistance_type'], AssistanceType.DEBUGGING.value)
        self.assertIsNotNone(result['analysis_result'])
    
    def test_analyze_error_convenience_method(self):
        """Test the analyze_error convenience method."""
        error_message = "TypeError: unsupported operand type(s) for +: 'int' and 'str'"
        
        result = self.chat_agent.analyze_error(
            self.session_id, error_message, "I don't understand this error"
        )
        
        self.assertEqual(result['assistance_type'], AssistanceType.ERROR_ANALYSIS.value)
        self.assertEqual(result['analysis_result'].error_type, 'type_error')
    
    def test_review_code_convenience_method(self):
        """Test the review_code convenience method."""
        code = """
def add_numbers(a, b):
    return a + b
"""
        
        result = self.chat_agent.review_code(
            self.session_id, code, focus_areas=['performance', 'readability']
        )
        
        self.assertEqual(result['assistance_type'], AssistanceType.CODE_REVIEW.value)
        self.assertIn('analysis_result', result)
    
    def test_get_beginner_help_convenience_method(self):
        """Test the get_beginner_help convenience method."""
        result = self.chat_agent.get_beginner_help(
            self.session_id, "functions", "How do I create a function?"
        )
        
        self.assertEqual(result['assistance_type'], AssistanceType.BEGINNER_HELP.value)
        self.assertIn('functions', result['response'].lower())
    
    def test_programming_assistance_with_language_switching(self):
        """Test programming assistance with different languages."""
        # Setup for JavaScript
        self.mock_language_context_manager.get_language.return_value = "javascript"
        
        code = """
function greet(name) {
    return "Hello, " + name + "!";
}

console.log(greet("Bob"));
"""
        
        result = self.chat_agent.process_programming_assistance(
            self.session_id, "Explain this JavaScript code", code=code
        )
        
        self.assertEqual(result['language'], 'javascript')
        analysis = result['analysis_result']
        self.assertEqual(analysis.language, 'javascript')
    
    def test_programming_assistance_with_context_metadata(self):
        """Test programming assistance with beginner context."""
        message = "I'm a beginner. Can you explain this code?"
        code = "print('Hello, World!')"
        
        result = self.chat_agent.process_programming_assistance(
            self.session_id, message, code=code
        )
        
        # Verify that beginner context was detected and used
        self.assertIn('response', result)
        
        # Check that user message was stored with metadata
        store_calls = self.mock_chat_history_manager.store_message.call_args_list
        user_message_call = store_calls[0]  # First call should be user message
        
        self.assertEqual(user_message_call[1]['role'], 'user')
        self.assertIn('assistance_type', user_message_call[1]['message_metadata'])
    
    def test_programming_assistance_error_handling(self):
        """Test error handling in programming assistance."""
        # Mock session error
        self.mock_session_manager.get_session.side_effect = Exception("Session error")
        
        with self.assertRaises(Exception):
            self.chat_agent.process_programming_assistance(
                self.session_id, "Test message"
            )
    
    def test_programming_assistance_response_formatting(self):
        """Test that responses are properly formatted."""
        code = """
def factorial(n):
    if n <= 1:
        return 1
    return n * factorial(n - 1)
"""
        
        result = self.chat_agent.process_programming_assistance(
            self.session_id, "Review this code", code=code,
            assistance_type=AssistanceType.CODE_REVIEW
        )
        
        # Verify response contains formatted analysis
        response = result['response']
        self.assertIn('Code Review', response)
        self.assertIn('Overall Assessment', response)
    
    def test_programming_assistance_with_chat_history(self):
        """Test programming assistance with existing chat history."""
        # Setup mock chat history
        mock_history = [
            Mock(role='user', content='Previous question', language='python', timestamp=datetime.utcnow()),
            Mock(role='assistant', content='Previous answer', language='python', timestamp=datetime.utcnow())
        ]
        self.mock_chat_history_manager.get_recent_history.return_value = mock_history
        
        result = self.chat_agent.process_programming_assistance(
            self.session_id, "Follow-up question about variables"
        )
        
        # Verify that chat history was retrieved and used
        self.mock_chat_history_manager.get_recent_history.assert_called_with(self.session_id)
        
        # Verify LLM was called with history context
        self.mock_groq_client.generate_response.assert_called_once()
        call_args = self.mock_groq_client.generate_response.call_args
        chat_history = call_args[1]['chat_history']
        self.assertEqual(len(chat_history), 2)  # Previous messages converted to ChatMessage format
    
    def test_programming_assistance_metadata_storage(self):
        """Test that assistance metadata is properly stored."""
        code = "x = 5\nprint(x)"
        
        result = self.chat_agent.process_programming_assistance(
            self.session_id, "Explain this", code=code,
            assistance_type=AssistanceType.CODE_EXPLANATION
        )
        
        # Check assistant message metadata
        store_calls = self.mock_chat_history_manager.store_message.call_args_list
        assistant_message_call = store_calls[1]  # Second call should be assistant message
        
        metadata = assistant_message_call[1]['message_metadata']
        self.assertEqual(metadata['assistance_type'], AssistanceType.CODE_EXPLANATION.value)
        self.assertTrue(metadata['analysis_performed'])
        self.assertIn('processing_time', metadata)
    
    def test_programming_assistance_session_updates(self):
        """Test that session is properly updated during assistance."""
        result = self.chat_agent.process_programming_assistance(
            self.session_id, "Help with Python"
        )
        
        # Verify session operations
        self.mock_session_manager.get_session.assert_called_with(self.session_id)
        self.mock_session_manager.update_session_activity.assert_called_with(self.session_id)
        self.mock_session_manager.increment_message_count.assert_called_with(self.session_id)
    
    def test_multiple_assistance_types_in_sequence(self):
        """Test handling multiple assistance requests in sequence."""
        # First request: Code explanation
        code = "def hello(): print('Hello')"
        result1 = self.chat_agent.process_programming_assistance(
            self.session_id, "Explain this", code=code,
            assistance_type=AssistanceType.CODE_EXPLANATION
        )
        
        # Second request: Error analysis
        error = "SyntaxError: invalid syntax"
        result2 = self.chat_agent.process_programming_assistance(
            self.session_id, "What's this error?", error_message=error,
            assistance_type=AssistanceType.ERROR_ANALYSIS
        )
        
        # Verify both requests were processed correctly
        self.assertEqual(result1['assistance_type'], AssistanceType.CODE_EXPLANATION.value)
        self.assertEqual(result2['assistance_type'], AssistanceType.ERROR_ANALYSIS.value)
        
        # Verify session was updated for both
        self.assertEqual(self.mock_session_manager.increment_message_count.call_count, 2)
    
    def test_programming_assistance_with_specialized_prompts(self):
        """Test that specialized prompts are used for different assistance types."""
        # Mock the language context manager to capture prompt templates
        self.mock_language_context_manager.get_language_prompt_template.return_value = "Base template"
        
        result = self.chat_agent.process_programming_assistance(
            self.session_id, "Debug this code", code="print(x)",
            error_message="NameError", assistance_type=AssistanceType.DEBUGGING
        )
        
        # Verify that generate_response was called with specialized language context
        call_args = self.mock_groq_client.generate_response.call_args
        language_context = call_args[1]['language_context']
        
        # The prompt template should contain debugging-specific instructions
        self.assertIn('debug', language_context.prompt_template.lower())
        self.assertIn('step-by-step solution', language_context.prompt_template)


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