from fastapi import APIRouter, WebSocket, WebSocketDisconnect, Query, Depends
from app.core.websocket_manager import manager
from app.core import security
from app.core.config import settings
from jose import jwt, JWTError
from app.api.v1 import deps
from sqlalchemy.orm import Session
from app.core.database import get_db, SessionLocal
from app.models.user import User

router = APIRouter()

async def get_user_from_token(token: str, db: Session):
    try:
        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
        user_id = payload.get("sub")
        if user_id is None:
            return None
        return db.query(User).filter(User.id == int(user_id)).first()
    except JWTError:
        return None

@router.websocket("/messages")
async def websocket_endpoint(
    websocket: WebSocket,
    token: str = Query(...)
):
    """
    全平台通用的 WebSocket 连接端点
    连接 URL: ws://host/api/v1/ws/messages?token=YOUR_JWT_TOKEN
    """
    db = SessionLocal()
    try:
        user = await get_user_from_token(token, db)
    finally:
        db.close()

    if not user:
        await websocket.close(code=4001, reason="Authentication failed")
        return

    await manager.connect(websocket, user.id)
    try:
        while True:
            # 接收客户端心跳
            data = await websocket.receive_text()
            if data == "ping":
                await websocket.send_text("pong")
    except WebSocketDisconnect:
        manager.disconnect(websocket, user.id)