#!/usr/bin/env python3
"""
Test suite for US-001: MCP Client Integration

This test suite validates all acceptance criteria for MCP client integration
with llama index deployments. Based on SPIKE-001 and SPIKE-002 validated patterns.
"""

import pytest
import asyncio
import json
import os
from unittest.mock import Mock, patch, AsyncMock, MagicMock
from typing import Dict, Any, List
import tempfile

# Test imports - using relative imports for package structure
try:
    from ...simple_mcp_client import SimpleMCPClient
    from ...endpoint_connector import MCPEndpointConnector
    from ...llama_integration import MCPEnhancedLlamaIndex
except ImportError:
    # Tests will initially fail - this is expected in TDD
    SimpleMCPClient = None
    MCPEndpointConnector = None
    MCPEnhancedLlamaIndex = None


class TestMCPClientLibraryIntegration:
    """Test AC-001: MCP Client Library Integration"""

    def test_mcp_client_import(self):
        """Test MCP client can be imported without errors"""
        # This test validates the basic import structure
        assert SimpleMCPClient is not None, "SimpleMCPClient should be importable"

    def test_simple_mcp_client_initialization(self):
        """Test SimpleMCPClient can be initialized"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        with patch.dict(os.environ, {'MCP_SERVERS': '{"atlassian": "https://test.com/sse"}'}):
            client = SimpleMCPClient()
            assert hasattr(client, 'servers')
            assert hasattr(client, 'connections')
            assert hasattr(client, 'health')

    def test_sse_connection_capability(self):
        """Test client can establish SSE connection capability"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        with patch.dict(os.environ, {'MCP_SERVERS': '{"atlassian": "https://test.com/sse"}'}):
            client = SimpleMCPClient()
            # Test that client has connection methods
            assert hasattr(client, 'connect_all')
            assert hasattr(client, 'connection_pool')  # Uses connection pool now

    def test_protocol_handshake_support(self):
        """Test client handles MCP protocol handshake"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        # This will test the protocol compliance once implemented
        client = SimpleMCPClient()
        assert hasattr(client, 'query')  # Main query interface


class TestBasicConnectivityValidation:
    """Test AC-002: Basic Connectivity Validation"""

    def test_external_route_connection_support(self):
        """Test support for external route connections"""
        if MCPEndpointConnector is None:
            pytest.skip("MCPEndpointConnector not implemented yet")
        
        connector = MCPEndpointConnector()
        # Test external route format validation
        assert connector.validate_endpoint_config("https://mcp-route.apps.cluster.com/sse")

    def test_cluster_service_connection_support(self):
        """Test support for cluster-internal service connections"""
        if MCPEndpointConnector is None:
            pytest.skip("MCPEndpointConnector not implemented yet")
        
        connector = MCPEndpointConnector()
        # Test cluster service format validation
        assert connector.validate_endpoint_config("mcp-atlassian.namespace.svc.cluster.local:8000")

    def test_invalid_endpoint_rejection(self):
        """Test invalid endpoints are properly rejected"""
        if MCPEndpointConnector is None:
            pytest.skip("MCPEndpointConnector not implemented yet")
        
        connector = MCPEndpointConnector()
        # Test invalid formats are rejected
        assert not connector.validate_endpoint_config("invalid-format")
        assert not connector.validate_endpoint_config("")
        assert not connector.validate_endpoint_config("ftp://invalid.com")

    def test_connection_timeout_configuration(self):
        """Test connection timeout configuration (30 second default)"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        with patch.dict(os.environ, {'MCP_SERVERS': '{"atlassian": "https://test.com/sse"}'}):
            client = SimpleMCPClient()
            # Verify timeout configuration exists in config
            assert hasattr(client, 'config')  # Should have configuration object
            assert client.config.default_timeout == 30  # Default timeout


class TestProtocolCompliance:
    """Test AC-003: Protocol Compliance"""

    def test_mcp_tool_discovery_implementation(self):
        """Test client implements MCP specification for tool discovery"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        client = SimpleMCPClient()
        # Test tool discovery capability
        assert hasattr(client, 'query')  # Should support tool discovery queries

    def test_message_format_support(self):
        """Test supports MCP message format for request/response cycles"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        # This will test message format compliance
        with patch.dict(os.environ, {'MCP_SERVERS': '{"atlassian": "https://test.com/sse"}'}):
            client = SimpleMCPClient()
            # Verify message handling exists through connection pool
            assert hasattr(client, 'connection_pool')

    def test_error_response_handling(self):
        """Test handles MCP error responses according to specification"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        # Test error handling patterns
        client = SimpleMCPClient()
        # Should have error handling in query method
        assert hasattr(client, 'query')

    def test_message_correlation_ids(self):
        """Test implements proper message sequencing and correlation IDs"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        # Test correlation ID handling
        client = SimpleMCPClient()
        # Should support correlation in async operations
        assert hasattr(client, 'query')


class TestMultiMCPServerConfiguration:
    """Test AC-004: Multi-MCP Server Configuration"""

    def test_multiple_mcp_server_support(self):
        """Test configure multiple MCP servers for llama index integration"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        config = json.dumps({
            "atlassian": "https://mcp-atlassian.com/sse",
            "github": "https://mcp-github.com/sse",
            "confluence": "mcp-confluence.namespace.svc.cluster.local:8000"
        })
        
        with patch.dict(os.environ, {'MCP_SERVERS': config}):
            client = SimpleMCPClient()
            assert len(client.servers) == 3
            assert "atlassian" in client.servers
            assert "github" in client.servers
            assert "confluence" in client.servers

    def test_json_configuration_parsing(self):
        """Test JSON-based multi-server configuration via environment variables"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        config = '{"atlassian": "https://test.com/sse"}'
        with patch.dict(os.environ, {'MCP_SERVERS': config}):
            client = SimpleMCPClient()
            assert "atlassian" in client.servers
            assert client.servers["atlassian"] == "https://test.com/sse"

    def test_configuration_validation_on_startup(self):
        """Test validate all MCP server configurations on startup with clear error messages"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        # Test invalid JSON configuration
        with patch.dict(os.environ, {'MCP_SERVERS': 'invalid-json'}):
            with pytest.raises(Exception):  # Should raise clear error
                SimpleMCPClient()

    def test_health_based_routing(self):
        """Test route requests to healthy MCP servers"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        client = SimpleMCPClient()
        # Should have health tracking
        assert hasattr(client, 'health')
        assert hasattr(client, 'query')  # Should support health-based routing


class TestConfigurationFormatSupport:
    """Test AC-005: Configuration Format Support"""

    def test_simple_format_single_server(self):
        """Test single MCP server via MCP_ENDPOINT"""
        # Note: Based on US-001 enhancement, we're using simplified JSON approach
        # This test validates the single server case using JSON format
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        config = '{"default": "https://server/sse"}'
        with patch.dict(os.environ, {'MCP_SERVERS': config}):
            client = SimpleMCPClient()
            assert "default" in client.servers

    def test_multi_server_json_configuration(self):
        """Test multiple servers via MCP_SERVERS JSON environment variable"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        config = json.dumps({
            "atlassian": "https://mcp-atlassian-route.apps.cluster.com/sse",
            "github": "https://mcp-github-route.apps.cluster.com/sse"
        })
        
        with patch.dict(os.environ, {'MCP_SERVERS': config}):
            client = SimpleMCPClient()
            assert len(client.servers) == 2
            assert client.servers["atlassian"] == "https://mcp-atlassian-route.apps.cluster.com/sse"

    def test_external_route_format_validation(self):
        """Test external route format validation (SPIKE-002 validated)"""
        if MCPEndpointConnector is None:
            pytest.skip("MCPEndpointConnector not implemented yet")
        
        connector = MCPEndpointConnector()
        # Test SPIKE-002 validated external route formats
        assert connector.validate_endpoint_config("https://mcp-route.apps.cluster.com/sse")
        assert connector.validate_endpoint_config("https://mcp-atlassian-route.apps.cluster.com/sse")

    def test_cluster_service_format_validation(self):
        """Test cluster service format validation (SPIKE-002 validated)"""
        if MCPEndpointConnector is None:
            pytest.skip("MCPEndpointConnector not implemented yet")
        
        connector = MCPEndpointConnector()
        # Test SPIKE-002 validated cluster service formats
        assert connector.validate_endpoint_config("mcp-atlassian.namespace.svc.cluster.local:8000")
        assert connector.validate_endpoint_config("service.ns.svc.cluster.local:8080")


class TestCapabilityRouting:
    """Test enhanced capability routing (from US-001 multi-MCP enhancement)"""

    def test_automatic_capability_detection(self):
        """Test keyword-based capability routing"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        client = SimpleMCPClient()
        # Test capability detection method exists
        assert hasattr(client, '_detect_capability')

    @pytest.mark.asyncio
    async def test_capability_based_request_routing(self):
        """Test requests route to correct servers based on capabilities"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        # Mock multi-server setup
        config = json.dumps({
            "atlassian": "https://mcp-atlassian.com/sse",
            "github": "https://mcp-github.com/sse"
        })
        
        with patch.dict(os.environ, {'MCP_SERVERS': config}):
            client = SimpleMCPClient()
            
            # Mock connection pool for testing
            with patch.object(client.connection_pool, 'get_connection_info') as mock_connections, \
                 patch.object(client.connection_pool, 'get_health_status') as mock_health:
                
                mock_connections.return_value = {
                    "atlassian": {"connected": True, "type": "external_route"},
                    "github": {"connected": True, "type": "external_route"}
                }
                mock_health.return_value = {"atlassian": True, "github": True}
                
                # Test capability detection
                capability = client._detect_capability("Get Jira tickets")
                assert capability == "atlassian"
                
                capability = client._detect_capability("List GitHub repos")
                assert capability == "github"


class TestLlamaIndexIntegration:
    """Test llama index integration patterns"""

    def test_llama_index_enhanced_class_creation(self):
        """Test enhanced llama index class can be created"""
        if MCPEnhancedLlamaIndex is None:
            pytest.skip("MCPEnhancedLlamaIndex not implemented yet")
        
        # Test creation without initialization
        assert MCPEnhancedLlamaIndex is not None

    @pytest.mark.asyncio
    async def test_enhanced_query_method(self):
        """Test enhanced query method integrates MCP and llama index"""
        if MCPEnhancedLlamaIndex is None:
            pytest.skip("MCPEnhancedLlamaIndex not implemented yet")
        
        # This will test the integration pattern
        enhanced = MCPEnhancedLlamaIndex()
        assert hasattr(enhanced, 'enhanced_query')


class TestDefinitionOfDone:
    """Test Definition of Done criteria"""

    @pytest.mark.asyncio
    async def test_mcp_client_connects_to_deployed_server(self):
        """Test MCP client successfully connects to deployed MCP Atlassian server"""
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        # This test will validate real connection capability
        config = '{"atlassian": "https://test-mcp-server.com/sse"}'
        
        with patch.dict(os.environ, {'MCP_SERVERS': config}):
            client = SimpleMCPClient()
            
            # Mock successful connection for test
            with patch.object(client.connection_pool, 'add_connection', new_callable=AsyncMock) as mock_connect:
                mock_connect.return_value = True
                
                await client.connect_all()
                # Check health status through the property
                health_status = await client.health_check()
                mock_connect.assert_called()

    def test_unit_test_coverage_requirement(self):
        """Test that unit test coverage is >90%"""
        # This test ensures we have comprehensive coverage
        # Coverage will be validated by external tools
        assert True  # Placeholder for coverage validation

    def test_integration_test_validation(self):
        """Test integration test validates end-to-end connectivity"""
        # This test will validate integration testing capability
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        # Integration test framework should exist
        assert SimpleMCPClient is not None

    def test_error_scenarios_documented(self):
        """Test error scenarios tested and documented"""
        # This test ensures error handling is comprehensive
        if SimpleMCPClient is None:
            pytest.skip("SimpleMCPClient not implemented yet")
        
        # Should have error handling in main methods
        client = SimpleMCPClient()
        assert hasattr(client, 'query')  # Should handle errors in query


if __name__ == "__main__":
    # Run tests with pytest
    pytest.main([__file__, "-v", "--tb=short"])