import asyncio
import websockets
import asyncio
import json

import paho.mqtt.client as mqtt
from pydantic import BaseModel

broker = 'mqtt.lihaink.cn'
port = 1883


class BaseResponse(BaseModel):
    code: int = 200
    msg: str = "success"


class MQTTClient:
    def __init__(self, broker, port, topic, username, password):
        self.broker = broker
        self.port = port
        self.topic = topic
        self.username = username
        self.password = password
        # 千万不要指定client_id 不然死翘翘
        self.client = mqtt.Client()
        self.client.username_pw_set(self.username, self.password)

    def push(self):
        self.client.publish(self.topic, payload=json.dumps({"msg": "open_led"}, ensure_ascii=False),
                            qos=0)
        self.client.publish(self.topic, payload=json.dumps({"msg": "push_stream"}, ensure_ascii=False),
                            qos=0)

    def close(self):
        self.client.publish(self.topic, payload=json.dumps({"msg": "close_stream"}, ensure_ascii=False),
                            qos=0)
        self.client.publish(self.topic, payload=json.dumps({"msg": "close_led"}, ensure_ascii=False),
                            qos=0)

    def start(self):
        self.client.connect(self.broker, self.port)


user_sched = {}


async def close(username, device):
    # 倒计时600秒
    await asyncio.sleep(5)
    print(username + "结束推流")
    user_sched.pop(username)
    close_stream(username, device)


async def task_start(username, device):
    print(username + "创建结束推流定时任务")
    task = asyncio.ensure_future(close(username, device))
    user_sched[username] = task
    print("已经完成")


async def start(username, device):
    try:
        # 如果定时任务不存在，那么直接进行推流。当用户退出界面时，创建任务
        if username not in user_sched:
            print(username + "开始推流")
            push_stream(username, device)
        # 如果定时任务存在，那么取消上次的任务。当用户退出界面时，创建任务
        else:
            t = user_sched[username]
            # 取消任务
            if t is not None:
                print(username + "取消定时任务")
                t.cancel()
        return BaseResponse(code=200, msg="success").json()
    except Exception as e:
        return BaseResponse(code=500, msg=str(e)).json()


async def stop(username, device):
    try:
        await task_start(username, device)
        return BaseResponse(code=200, msg="success").json()
    except Exception as e:
        return BaseResponse(code=500, msg=str(e)).json()


def push_stream(username, device):
    MQTT = MQTTClient(broker, port, device, username, username)
    MQTT.start()
    MQTT.push()


def close_stream(username, device):
    MQTT = MQTTClient(broker, port, device, username, username)
    MQTT.start()
    MQTT.close()


# 定义函数A
async def function_A(client, data):
    data = json.loads(data)
    username = data['username']
    device = data['device']
    print("A", username, device)
    return await start(username, device)


# 定义函数B
async def function_B(client, data):
    data = json.loads(data)
    username = data['username']
    device = data['device']
    print("B", username, device)
    print(f"{client}的连接已断开")
    await stop(username, device)


user_msg = {}


# 创建WebSocket连接的处理函数
async def handler(websocket, path):
    msg = ""
    try:
        # 在循环中等待客户端的消息
        async for message in websocket:
            user_msg[websocket] = message
            # 当接收到消息时调用函数A
            response = await function_A(websocket, message)
            await websocket.send(response)
        # 本地情况
        # await function_B(websocket, message)
    except Exception as e:
        msg = user_msg[websocket]
        print("Exception=", msg)
        await function_B(websocket, msg)


# 启动WebSocket服务器
start_server = websockets.serve(handler, "0.0.0.0", 8765)

asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()