# api/services/chat_service.py
from typing import Dict, Optional
from api.config import settings, logger
from api.models import ChatResponse
from uuid import uuid4


class ChatService:
    """Service for handling chat operations"""
    
    @staticmethod
    async def process_message(
        message: str,
        session_id: Optional[str] = None
    ) -> ChatResponse:
        """Process a chat message"""
        if not settings.system_initialized or not settings.chat_manager:
            raise Exception("System not initialized")
        
        session_id = session_id or f"api_{uuid4()}"
        
        # Check for pending interrupt
        if settings.chat_manager.has_pending_interrupt(session_id):
            interrupt_info = settings.chat_manager.pending_interrupts.get(session_id, {})
            interrupt_data_obj = interrupt_info.get("interrupt_data")
            
            interrupt_value = (
                interrupt_data_obj.value 
                if hasattr(interrupt_data_obj, 'value') 
                else {}
            )
            
            return ChatResponse(
                response="⏸️ Pending approval request. Please approve/reject first.",
                session_id=session_id,
                has_interrupt=True,
                interrupt_type="human_approval",
                interrupt_data=interrupt_value
            )
        
        # Process message
        response_text = await settings.chat_manager.chat(
            message=message,
            session_id=session_id
        )
        
        # Check if interrupt occurred
        has_interrupt = settings.chat_manager.has_pending_interrupt(session_id)
        interrupt_value = None
        
        if has_interrupt:
            interrupt_info = settings.chat_manager.pending_interrupts.get(session_id, {})
            interrupt_data_obj = interrupt_info.get("interrupt_data")
            
            if hasattr(interrupt_data_obj, 'value'):
                interrupt_value = interrupt_data_obj.value
            elif isinstance(interrupt_data_obj, dict):
                interrupt_value = interrupt_data_obj.get("value", {})
        
        return ChatResponse(
            response=response_text,
            session_id=session_id,
            has_interrupt=has_interrupt,
            interrupt_type="human_approval" if has_interrupt else None,
            interrupt_data=interrupt_value
        )
    
    @staticmethod
    async def approve_request(
        session_id: str,
        decision: str,
        reason: Optional[str] = None
    ) -> Dict:
        """Approve or reject an assistance request"""
        if not settings.chat_manager:
            raise Exception("System not initialized")
        
        if not settings.chat_manager.has_pending_interrupt(session_id):
            raise Exception("No pending interrupt")
        
        decision_text = f"{decision} {reason or ''}"
        response_text = await settings.chat_manager.chat(
            message=decision_text,
            session_id=session_id
        )
        
        return {
            "status": "success",
            "decision": decision,
            "response": response_text,
            "session_id": session_id
        }
    
    @staticmethod
    async def get_session_status(session_id: str) -> Dict:
        """Get session status"""
        if not settings.chat_manager:
            raise Exception("System not initialized")
        
        has_interrupt = settings.chat_manager.has_pending_interrupt(session_id)
        interrupt_data = None
        
        if has_interrupt:
            interrupt_info = settings.chat_manager.pending_interrupts.get(session_id, {})
            interrupt_data_obj = interrupt_info.get("interrupt_data")
            
            if hasattr(interrupt_data_obj, 'value'):
                interrupt_data = interrupt_data_obj.value
        
        return {
            "session_id": session_id,
            "has_pending_interrupt": has_interrupt,
            "interrupt_data": interrupt_data
        }
    
    @staticmethod
    async def get_history(session_id: str) -> Dict:
        """Get conversation history"""
        if not settings.chat_manager:
            raise Exception("System not initialized")
        
        history = await settings.chat_manager.get_conversation_history(session_id)
        
        return {
            "session_id": session_id,
            "history": [
                {
                    "role": msg.type if hasattr(msg, 'type') else "unknown",
                    "content": msg.content if hasattr(msg, 'content') else str(msg)
                }
                for msg in history
            ]
        }
    
    @staticmethod
    async def list_sessions() -> Dict:
        """List all active sessions"""
        if not settings.chat_manager:
            raise Exception("System not initialized")
        
        sessions_info = []
        for session_id in settings.chat_manager.pending_interrupts.keys():
            interrupt_info = settings.chat_manager.pending_interrupts.get(session_id, {})
            interrupt_data_obj = interrupt_info.get("interrupt_data")
            
            data = (
                interrupt_data_obj.value 
                if hasattr(interrupt_data_obj, 'value') 
                else {}
            )
            
            sessions_info.append({
                "session_id": session_id,
                "has_interrupt": True,
                "user_email": data.get("user_email"),
                "country": data.get("country"),
                "description": data.get("description")
            })
        
        return {
            "total_pending": len(sessions_info),
            "sessions": sessions_info
        }
    
    @staticmethod
    async def clear_session(session_id: str) -> Dict:
        """Clear a session"""
        if not settings.chat_manager:
            raise Exception("System not initialized")
        
        if session_id in settings.chat_manager.pending_interrupts:
            del settings.chat_manager.pending_interrupts[session_id]
        
        return {
            "status": "success",
            "message": f"Session {session_id} cleared"
        }