"""
WebSocket API
"""
from fastapi import APIRouter, WebSocket, WebSocketDisconnect
from app.websocket.manager import websocket_manager
from app.core.database import SessionLocal
from app.models.execution import Execution
from typing import Optional
import json
import asyncio


router = APIRouter()


def _get_progress_from_redis(execution_id: str) -> Optional[dict]:
    """从 Redis 读取进度数据。"""
    try:
        from app.core.redis_client import get_redis_client
        redis_client = get_redis_client()
        if redis_client:
            raw = redis_client.get(f"workflow:progress:{execution_id}")
            if raw:
                return json.loads(raw)
    except Exception:
        pass
    return None


@router.websocket("/api/v1/ws/executions/{execution_id}")
async def websocket_execution_status(
    websocket: WebSocket,
    execution_id: str,
    token: Optional[str] = None
):
    """
    WebSocket实时推送执行状态

    Args:
        websocket: WebSocket连接
        execution_id: 执行记录ID
        token: JWT Token（可选，通过query参数传递）
    """
    await websocket_manager.connect(websocket, execution_id)

    db = SessionLocal()

    try:
        # 发送初始状态
        execution = db.query(Execution).filter(Execution.id == execution_id).first()
        if execution:
            # 尝试从 Redis 读取进度
            redis_progress = _get_progress_from_redis(execution_id)
            if redis_progress:
                await websocket_manager.send_personal_message({
                    "type": "progress",
                    "execution_id": execution_id,
                    **redis_progress,
                }, websocket)
            else:
                await websocket_manager.send_personal_message({
                    "type": "status",
                    "execution_id": execution_id,
                    "status": execution.status,
                    "progress": 0,
                    "message": "连接已建立"
                }, websocket)
        else:
            await websocket_manager.send_personal_message({
                "type": "error",
                "message": f"执行记录 {execution_id} 不存在"
            }, websocket)
            await websocket.close()
            return

        last_progress = -1

        # 持续监听并推送状态更新
        while True:
            try:
                # 接收客户端消息（心跳等），超时 1 秒以便轮询进度
                try:
                    data = await asyncio.wait_for(websocket.receive_text(), timeout=1.0)
                    try:
                        message = json.loads(data)
                        if message.get("type") == "ping":
                            await websocket_manager.send_personal_message({
                                "type": "pong"
                            }, websocket)
                    except Exception:
                        pass
                except asyncio.TimeoutError:
                    pass  # 超时后轮询进度

            except WebSocketDisconnect:
                break

            # 优先从 Redis 读取进度（推送模式）
            redis_progress = _get_progress_from_redis(execution_id)
            if redis_progress:
                pct = redis_progress.get("progress", -1)
                if pct != last_progress:
                    last_progress = pct
                    await websocket_manager.send_personal_message({
                        "type": "progress",
                        "execution_id": execution_id,
                        **redis_progress,
                    }, websocket)
            else:
                # Redis 不可用时回退到 DB 轮询
                db.refresh(execution)
                pct = 100 if execution.status in ["completed", "failed"] else (50 if execution.status == "running" else 0)
                if pct != last_progress:
                    last_progress = pct
                    await websocket_manager.send_personal_message({
                        "type": "status",
                        "execution_id": execution_id,
                        "status": execution.status,
                        "progress": pct,
                        "message": f"执行中..." if execution.status == "running" else "等待执行"
                    }, websocket)

            # 如果执行完成或失败，发送最终状态并断开
            db.refresh(execution)
            if execution.status in ["completed", "failed"]:
                await websocket_manager.send_personal_message({
                    "type": "status",
                    "execution_id": execution_id,
                    "status": execution.status,
                    "progress": 100,
                    "result": execution.output_data if execution.status == "completed" else None,
                    "error": execution.error_message if execution.status == "failed" else None,
                    "execution_time": execution.execution_time
                }, websocket)

                await asyncio.sleep(1)
                break

    except WebSocketDisconnect:
        pass
    except Exception as e:
        print(f"WebSocket错误: {e}")
        try:
            await websocket_manager.send_personal_message({
                "type": "error",
                "message": f"发生错误: {str(e)}"
            }, websocket)
        except Exception:
            pass
    finally:
        websocket_manager.disconnect(websocket, execution_id)
        db.close()