import json
import uuid

from fastapi import WebSocket, WebSocketDisconnect, APIRouter, Request, Depends
import asyncio
import websockets
from sqlalchemy.orm import Session
from app.api import get_current_user_websocket
from app.config.config import settings
from app.models.base_model import get_db
from app.models.user_model import UserModel
from app.service.token import get_bisheng_token

router = APIRouter()

# 存储客户端 WebSocket 连接
client_websockets = {}


# 中间层WebSocket 服务器，接收客户端的连接
@router.websocket("/ws/{agent_id}/{chat_id}")
async def handle_client(websocket: WebSocket,
                        agent_id: str,
                        chat_id: str,
                        current_user: UserModel = Depends(get_current_user_websocket),
                        db: Session = Depends(get_db)):
    await websocket.accept()
    print(f"Client {agent_id} connected")

    token = get_bisheng_token(db, current_user.id)

    if agent_id == "0":
        agent_id = settings.bisheng_agent_id
    if chat_id == "0":
        chat_id = uuid.uuid4().hex

    # 连接到服务端
    service_uri = f"{settings.bisheng_websocket_url}/api/v1/assistant/chat/{agent_id}?t=&chat_id={chat_id}"
    headers = {
        'cookie':  f"access_token_cookie={token};"
    }

    async with websockets.connect(service_uri, extra_headers=headers) as service_websocket:
        client_websockets[chat_id] = websocket

        try:
            # 处理客户端发来的消息
            async def forward_to_service():
                while True:
                    message = await websocket.receive_json()
                    print(f"Received from client {chat_id}: {message}")
                    # 添加 'agent_id' 和 'chat_id' 字段
                    message['flow_id'] = agent_id
                    message['chat_id'] = chat_id
                    msg = message["message"]
                    del message["message"]
                    message['inputs'] = {
                        "data": {"chatId": chat_id, "id": agent_id, "type": "assistant"},
                        "input": msg
                    }
                    await service_websocket.send(json.dumps(message))
                    print(f"Forwarded to bisheng: {message}")


            # 监听毕昇发来的消息并转发给客户端
            async def forward_to_client():
                while True:
                    message = await service_websocket.recv()
                    print(f"Received from service S: {message}")
                    await websocket.send_text(message)
                    print(f"Forwarded to client {chat_id}: {message}")

            # 启动两个任务，分别处理客户端和服务端的消息
            tasks = [
                asyncio.create_task(forward_to_service()),
                asyncio.create_task(forward_to_client())
            ]

            done, pending = await asyncio.wait(tasks, return_when=asyncio.FIRST_COMPLETED)

            # 取消未完成的任务
            for task in pending:
                task.cancel()
                try:
                    await task
                except asyncio.CancelledError:
                    pass

        except WebSocketDisconnect:
            print(f"Client {chat_id} disconnected")
        finally:
            del client_websockets[chat_id]