# web/server.py
import asyncio
from typing import List, Any, Dict
from fastapi import FastAPI, Request, WebSocket, WebSocketDisconnect
from fastapi.responses import JSONResponse

from vs_types import (
    success,
    fail,
    BizException,
    ApiResponse,
    GroupControl,
    UpgradePluginRequest,
    UpdateConfigRequest,
    PluginStatusOut,
    GroupConfig,
    PluginRestarted
)
from core.app_manager import AppManager
from vs_log_macros import VSC_INFO, VSC_ERROR


app = FastAPI(title="Visa Plugin Manager")


# -----------------------
# Exception Handlers
# -----------------------
@app.exception_handler(BizException)
async def biz_exception_handler(request: Request, exc: BizException):
    return JSONResponse(
        status_code=exc.http_status,
        content={
            "code": exc.code,
            "message": exc.message,
            "data": exc.extra,
        },
    )


@app.exception_handler(Exception)
async def unhandled_exception_handler(request: Request, exc: Exception):
    return JSONResponse(
        status_code=500,
        content={
            "code": 50000,
            "message": "Internal Server Error",
            "data": None,
        },
    )

@app.get("/status", response_model=ApiResponse[List[PluginStatusOut]])
def get_status():
    plugin_status = AppManager.Instance().get_status()
    return success(data=plugin_status)

@app.post("/start", response_model=ApiResponse)
def start_group(payload: GroupControl):
    AppManager.Instance().start_group(payload.group_id)
    return success(message=f"Group {payload.group_id} started")

@app.post("/stop", response_model=ApiResponse)
def stop_group(payload: GroupControl):
    AppManager.Instance().stop_group(payload.group_id)
    return success(message=f"Group {payload.group_id} stopped")

@app.post("/restart", response_model=ApiResponse)
def restart_group(payload: GroupControl):
    AppManager.Instance().restart_group(payload.group_id)
    return success(message=f"Group {payload.group_id} restarted")

@app.post("/group_config", response_model=ApiResponse[GroupConfig])
def get_group_config(payload: GroupControl):
    config = AppManager.Instance().get_group_config(payload.group_id)
    return success(data=config)

@app.post("/ota/upgrade_plugin", response_model=ApiResponse[PluginRestarted])
def ota_upgrade(payload: UpgradePluginRequest):
    restarted = AppManager.Instance().ota_upgrade_plugin(payload.plugin_name)
    return success(message=f"Plugin {payload.plugin_name} reloaded", data=restarted)
    
@app.post("/ota/update_config")
def ota_update(payload: UpdateConfigRequest):
    AppManager.Instance().ota_update_plugin_config(payload.group_id, payload.new_config_str)
    return success(message=f"Plugin {payload.group_id} config updated")
    
@app.websocket("/ws/logs/{group_id}")
async def websocket_logs_batch(ws: WebSocket, group_id: str):
    await ws.accept()
    queue = asyncio.Queue(maxsize=5000)
    loop = asyncio.get_running_loop()

    def _put_msg_in_loop(msg: str):
        try:
            queue.put_nowait(msg)
        except asyncio.QueueFull:
            pass

    def log_callback(msg: str):
        loop.call_soon_threadsafe(_put_msg_in_loop, msg)

    AppManager.Instance().subscribe_executor_logs(group_id, log_callback)

    try:
        buffer = []
        while True:
            # 阻塞等待第一条消息
            msg = await queue.get()
            buffer.append(msg)

            # 尝试非阻塞获取队列中剩余的消息（最多取 50 条，避免包太大）
            # 这样可以将瞬间涌入的日志合并成一个包发送
            for _ in range(50):
                if queue.empty():
                    break
                try:
                    buffer.append(queue.get_nowait())
                except asyncio.QueueEmpty:
                    break
            
            # 合并发送 (根据前端需求，可以用换行符拼接，或者发送 JSON 数组)
            if buffer:
                await ws.send_text("\n".join(buffer))
                buffer.clear()
    except WebSocketDisconnect:
        # 这是 FastAPI/Starlette 封装的标准异常
        # 当客户端断开连接时会抛出这个
        print(f"Client {group_id} disconnected")
    except Exception as e:
        # 处理其他未知的系统错误
        print(f"Error: {e}")
    finally:
        AppManager.Instance().unsubscribe_executor_logs(group_id, log_callback)

def run_web_server(host="0.0.0.0", port=8000):
    import uvicorn
    # log_level warning 减少控制台刷屏
    uvicorn.run(app, host=host, port=port, log_level="info")