"""
MCP Client for Secure AI Agents Suite
Handles communication with Model Context Protocol servers
"""

import json
import asyncio
import aiohttp
import logging
from typing import Dict, List, Optional, Any


class MCPClient:
    """Client for communicating with MCP (Model Context Protocol) servers."""
    
    def __init__(self, mcp_server_url: str, config: Dict[str, Any] = None):
        self.mcp_server_url = mcp_server_url.rstrip('/')
        self.config = config or {}
        self.session: Optional[aiohttp.ClientSession] = None
        self.available_tools: Dict[str, Any] = {}
        self.logger = logging.getLogger(__name__)
    
    async def __aenter__(self):
        self.session = aiohttp.ClientSession()
        await self.discover_tools()
        return self
    
    async def __aexit__(self, exc_type, exc_val, exc_tb):
        if self.session:
            await self.session.close()
    
    async def discover_tools(self):
        """Discover available tools from MCP server."""
        try:
            # Simulate tool discovery for demo purposes
            # In production, this would make actual HTTP request to MCP server
            self.available_tools = {
                "crm_update": {
                    "name": "crm_update",
                    "description": "Update customer information in CRM system",
                    "parameters": {
                        "customer_id": "string",
                        "field": "string", 
                        "value": "string"
                    }
                },
                "ticket_create": {
                    "name": "ticket_create", 
                    "description": "Create support ticket",
                    "parameters": {
                        "title": "string",
                        "description": "string",
                        "priority": "string",
                        "category": "string"
                    }
                },
                "calendar_schedule": {
                    "name": "calendar_schedule",
                    "description": "Schedule calendar events",
                    "parameters": {
                        "title": "string",
                        "datetime": "string",
                        "attendees": "array",
                        "description": "string"
                    }
                },
                "search_contacts": {
                    "name": "search_contacts",
                    "description": "Search for contacts in CRM",
                    "parameters": {
                        "query": "string",
                        "limit": "integer"
                    }
                },
                "get_calendar_events": {
                    "name": "get_calendar_events",
                    "description": "Get calendar events",
                    "parameters": {
                        "date": "string",
                        "limit": "integer"
                    }
                }
            }
            self.logger.info(f"Discovered {len(self.available_tools)} tools")
        except Exception as e:
            self.logger.error(f"Error discovering tools: {e}")
    
    async def call_tool(self, tool_name: str, parameters: Dict[str, Any], session_id: str = "default") -> Dict[str, Any]:
        """Call a tool on the MCP server."""
        if tool_name not in self.available_tools:
            raise ValueError(f"Tool {tool_name} not available. Available tools: {list(self.available_tools.keys())}")
        
        request = {
            "tool": tool_name,
            "parameters": parameters,
            "session_id": session_id
        }
        
        try:
            # Simulate MCP tool call for demo purposes
            # In production, this would make actual HTTP request to MCP server
            result = await self._simulate_tool_call(tool_name, parameters)
            self.logger.info(f"Tool call successful: {tool_name}")
            return result
        except Exception as e:
            error_msg = f"MCP tool call exception: {str(e)}"
            self.logger.error(error_msg)
            return {"error": error_msg}
    
    async def _simulate_tool_call(self, tool_name: str, parameters: Dict[str, Any]) -> Dict[str, Any]:
        """Simulate MCP tool calls for demo purposes."""
        await asyncio.sleep(0.1)  # Simulate network delay
        
        if tool_name == "crm_update":
            return {
                "success": True,
                "message": f"Customer {parameters.get('customer_id')} updated successfully",
                "field": parameters.get("field"),
                "value": parameters.get("value")
            }
        elif tool_name == "ticket_create":
            ticket_id = f"TKT-{hash(str(parameters)) % 10000:04d}"
            return {
                "success": True,
                "ticket_id": ticket_id,
                "message": f"Support ticket {ticket_id} created successfully",
                "title": parameters.get("title"),
                "priority": parameters.get("priority")
            }
        elif tool_name == "calendar_schedule":
            event_id = f"EVT-{hash(str(parameters)) % 10000:04d}"
            return {
                "success": True,
                "event_id": event_id,
                "message": f"Calendar event '{parameters.get('title')}' scheduled for {parameters.get('datetime')}",
                "datetime": parameters.get("datetime"),
                "attendees": parameters.get("attendees", [])
            }
        elif tool_name == "search_contacts":
            # Simulate contact search results
            mock_contacts = [
                {"id": "001", "name": "John Smith", "email": "john.smith@company.com", "company": "Tech Corp"},
                {"id": "002", "name": "Sarah Johnson", "email": "sarah.j@startup.io", "company": "Startup Inc"},
                {"id": "003", "name": "Mike Chen", "email": "mchen@enterprise.com", "company": "Enterprise LLC"}
            ]
            return {
                "success": True,
                "contacts": mock_contacts,
                "count": len(mock_contacts)
            }
        elif tool_name == "get_calendar_events":
            # Simulate calendar events
            mock_events = [
                {"id": "evt001", "title": "Team Meeting", "datetime": "2025-11-29 14:00", "location": "Conference Room A"},
                {"id": "evt002", "title": "Client Call", "datetime": "2025-11-29 16:30", "location": "Virtual"}
            ]
            return {
                "success": True,
                "events": mock_events,
                "count": len(mock_events)
            }
        else:
            return {"success": False, "error": f"Unknown tool: {tool_name}"}
    
    def get_available_tools(self) -> List[str]:
        """Get list of available tool names."""
        return list(self.available_tools.keys())
    
    def get_tool_info(self, tool_name: str) -> Optional[Dict[str, Any]]:
        """Get detailed information about a specific tool."""
        return self.available_tools.get(tool_name)


# Global MCP client instances for each agent type
ENTERPRISE_MCP_CLIENT = None
CONSUMER_MCP_CLIENT = None
CREATIVE_MCP_CLIENT = None
VOICE_MCP_CLIENT = None


async def get_enterprise_mcp_client():
    """Get or create enterprise MCP client."""
    global ENTERPRISE_MCP_CLIENT
    if ENTERPRISE_MCP_CLIENT is None:
        ENTERPRISE_MCP_CLIENT = MCPClient("https://enterprise-mcp.example.com")
        async with ENTERPRISE_MCP_CLIENT:
            pass  # Client is ready
    return ENTERPRISE_MCP_CLIENT


async def get_consumer_mcp_client():
    """Get or create consumer MCP client."""
    global CONSUMER_MCP_CLIENT
    if CONSUMER_MCP_CLIENT is None:
        CONSUMER_MCP_CLIENT = MCPClient("https://consumer-mcp.example.com")
        async with CONSUMER_MCP_CLIENT:
            pass  # Client is ready
    return CONSUMER_MCP_CLIENT


async def get_creative_mcp_client():
    """Get or create creative MCP client."""
    global CREATIVE_MCP_CLIENT
    if CREATIVE_MCP_CLIENT is None:
        CREATIVE_MCP_CLIENT = MCPClient("https://creative-mcp.example.com")
        async with CREATIVE_MCP_CLIENT:
            pass  # Client is ready
    return CREATIVE_MCP_CLIENT


async def get_voice_mcp_client():
    """Get or create voice MCP client."""
    global VOICE_MCP_CLIENT
    if VOICE_MCP_CLIENT is None:
        VOICE_MCP_CLIENT = MCPClient("https://voice-mcp.example.com")
        async with VOICE_MCP_CLIENT:
            pass  # Client is ready
    return VOICE_MCP_CLIENT