from aiohttp import web, WSMsgType
from typing import Any, Dict, Set
import asyncio
import json
from dataclasses import dataclass

from .web_agent import WebAgent, WebAgentState
from .web_io_buffer import WebIOBuffer

@dataclass
class ClientMessage:
    """Messages that can be received from clients."""
    APPROVE_CONTEXT = "APPROVE_CONTEXT"
    APPROVE_RESPONSE = "APPROVE_RESPONSE" 
    MODIFY_RESPONSE = "MODIFY_RESPONSE"
    SEND_INPUT = "SEND_INPUT"

@dataclass
class ServerMessage:
    """Messages that can be sent to clients."""
    STATE_CHANGE = "STATE_CHANGE"
    CONTEXT_UPDATE = "CONTEXT_UPDATE"
    RESPONSE_UPDATE = "RESPONSE_UPDATE"
    OUTPUT_UPDATE = "OUTPUT_UPDATE"

class WebSocketManager:
    """
    Manages WebSocket connections and integrates with the WebAgent
    """
    def __init__(self,
                agent: WebAgent,
                io_buffer: WebIOBuffer):
        """Initialize the web server."""
        self.agent = agent
        self.io_buffer = io_buffer
        self._clients: Set[web.WebSocketResponse] = set()

        self.agent.add_state_change_handler(self._handle_state_change)
        self.agent.add_response_change_handler(self._handle_response_change)

    async def broadcast_message(self, message: Dict):
        """Broadcast message to all connected clients."""
        disconnected = set()
        for ws in self._clients:
            try:
                await ws.send_json(message)
            except ConnectionResetError:
                disconnected.add(ws)
        self._clients -= disconnected
        
    def _handle_state_change(self, new_state: WebAgentState):
        """Handle state changes from the WebAgent."""
        asyncio.run(self.broadcast_message({
            "type": ServerMessage.STATE_CHANGE,
            "state": new_state.name,
        }))

    def _handle_response_change(self, response: str, validation_error: str):
        """Handle response changes from the WebAgent."""
        asyncio.run(self.broadcast_message({
            "type": ServerMessage.RESPONSE_UPDATE,
            "response": response,
            "validation_error": validation_error
        }))

    async def handle_websocket(self, request: web.Request) -> web.WebSocketResponse:
        """Handle new WebSocket connections and messages."""
        ws = web.WebSocketResponse(heartbeat=30)
        await ws.prepare(request)

        self._clients.add(ws)
        
        try:
            await ws.send_json({
                "type": ServerMessage.STATE_CHANGE,
                "state": self.agent.current_state.name
            })
            await ws.send_json({
                "type": ServerMessage.CONTEXT_UPDATE,
                "context": self.agent.context
            })
            await ws.send_json({
                "type": ServerMessage.RESPONSE_UPDATE,
                "response": self.agent.response,
                "validation_error": self.agent._validation_error
            })
            async for msg in ws:
                if msg.type == WSMsgType.TEXT:
                    #try:
                    data = json.loads(msg.data)
                    await self._handle_client_message(request, data)
                    #except Exception as e:
                    #    print(f"Error handling incoming websocket message: {msg}\n{e}")
                elif msg.type == WSMsgType.ERROR:
                    print(f"WebSocket connection closed with error: {ws.exception()}")
        finally:
            self._clients.remove(ws)
        return ws

    async def _handle_client_message(self, request: web.Request, data: dict[str, Any]):
        """Handle incoming client message."""
        message_type = data.get("type")
        
        if message_type == ClientMessage.APPROVE_CONTEXT:
            if self.agent.current_state == WebAgentState.CONTEXT_APPROVAL:
                await asyncio.to_thread(self.agent.approve_context)
        elif message_type == ClientMessage.APPROVE_RESPONSE:
            if self.agent.current_state == WebAgentState.RESPONSE_APPROVAL:
                await asyncio.to_thread(self.agent.approve_response)
        elif message_type == ClientMessage.MODIFY_RESPONSE:
            if self.agent.current_state == WebAgentState.RESPONSE_APPROVAL:
                await asyncio.to_thread(self.agent.set_response, data.get("response"))
        elif message_type == ClientMessage.SEND_INPUT:
                self.io_buffer.append_stdin(data.get("input"))