from fastapi import WebSocket, WebSocketDisconnect

from app.exceptions import IncorrectDataException, UserDontHavePermissionException
from app.users.chat.dao import ChatDAO
from app.users.auth import validate_user_access_to_chat, check_verificated_user_with_exc
from app.users.chat.router import router


class ConnectionManager(WebSocket):
    def __init__(self):
        self.active_connections: dict[int, list[WebSocket]] = {}

    async def connect(self, chat_id: int, websocket: WebSocket):
        await websocket.accept()
        if chat_id not in self.active_connections:
            self.active_connections[chat_id] = []
        self.active_connections[chat_id].append(websocket)

    def disconnect(self, chat_id: int, websocket: WebSocket):
        self.active_connections[chat_id].remove(websocket)

    async def broadcast(self, user_id: int, chat_id: int, message: dict):
        if "flag" not in message:
            raise IncorrectDataException

        if message['flag'] == 'send':
            new_message = await self.add_message_to_database(
                user_id=user_id, chat_id=chat_id, message=message['message'], image_url=message['image_url']
            )
            new_message = dict(new_message)
            new_message['created_at'] = new_message['created_at'].isoformat()
            new_message['flag'] = 'send'
        elif message['flag'] == 'delete':
            if message["user_id"] != user_id:
                raise UserDontHavePermissionException
            deleted_message = await self.delete_message(message["id"])
            new_message = {'deleted_message': deleted_message, 'id': message['id'], "flag": "delete"}
        elif message['flag'] == 'edit':
            if message["user_id"] != user_id:
                raise UserDontHavePermissionException
            edited_message = await self.edit_message(message['id'], message['new_message'], message['new_image_url'])
            new_message = {'edited_message': edited_message, "flag": "edit", "message_id": message["id"],
                           "new_message": message["new_message"], "new_image_url": message["new_image_url"]}
        else:
            raise IncorrectDataException

        for websocket in self.active_connections[chat_id]:
            await websocket.send_json(new_message)

    @staticmethod
    async def add_message_to_database(user_id: int, chat_id: int, message: str, image_url: str) -> dict:
        new_message = await ChatDAO.send_message(user_id=user_id, chat_id=chat_id, message=message, image_url=image_url)
        return new_message[0]

    @staticmethod
    async def delete_message(message_id: int) -> bool:
        new_message = await ChatDAO.delete_message(message_id)
        return new_message

    @staticmethod
    async def edit_message(message_id: int, new_message: str, image_url: str) -> bool:
        new_message = await ChatDAO.edit_message(message_id=message_id, new_message=new_message, new_image_url=image_url)
        return new_message


manager = ConnectionManager()


@router.websocket("/ws/{chat_id}")
async def websocket_endpoint(chat_id: int, user_id: int, websocket: WebSocket):
    await check_verificated_user_with_exc(user_id=user_id)
    await validate_user_access_to_chat(user_id=user_id, chat_id=chat_id)
    await manager.connect(chat_id, websocket)
    try:
        while True:
            data = await websocket.receive_json()

            await manager.broadcast(user_id=user_id, chat_id=chat_id, message=data)
    except WebSocketDisconnect:
        manager.disconnect(chat_id, websocket)