import websockets
import asyncio
import json

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

broker = 'mqtt.lihaink.cn'
port = 1883
APP = "app"
SCREEN = "screen"
WEB = "web"
SCENE_NAME = "scene"
user_sched = {}
user_msg = {}
user_scene = {
    SCREEN: False,
    APP: False,
    WEB: False
}


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)


async def close(username, device):
    # 倒计时600秒
    await asyncio.sleep(30)
    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.create_task(close(username, device))
    user_sched[username] = task


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)


# 创建WebSocket连接的处理函数
async def handler(websocket, path):
    scene = None
    try:
        # 在循环中等待客户端的消息
        async for message in websocket:
            user_msg[websocket] = message
            data = json.loads(message)
            scene = data[SCENE_NAME]
            # 如果该场景已经开启，那么不在开启了
            if user_scene[scene] is True:
                await websocket.send(json.dumps({"code": 200, "msg": scene + "该场景已经开启了，不要再请求我了！"}, ensure_ascii=False))
                continue
            if user_scene[APP] is True or user_scene[WEB] is True or user_scene[SCREEN] is True:
                user_scene[scene] = True
                await websocket.send(json.dumps({"code": 200, "msg": "已经有其他场景开启了，不需要再推流了！"}, ensure_ascii=False))
                continue
            # 如果该场景没有开启，那么进行开启
            user_scene[scene] = True
            # 当接收到消息时调用函数A
            response = await function_A(websocket, message)
            await websocket.send(response)
        # 没有消息了，则首先关闭该场景
        if scene is not None:
            user_scene[scene] = False
        # 查看所有场景是否在线,只有都不在线就关闭推流
        if user_scene[APP] is False and user_scene[WEB] is False and user_scene[SCREEN] is False:
            await websocket.send(json.dumps({"code": 200, "msg": "开始关闭场景" + scene}, ensure_ascii=False))
            await function_B(websocket, user_msg[websocket])
    except Exception as e:
        data = json.loads(user_msg[websocket])
        scene = data[SCENE_NAME]
        if scene is not None:
            user_scene[scene] = False
        # 查看所有场景是否在线,只有都不在线就关闭推流
        if user_scene[APP] is False and user_scene[WEB] is False and user_scene[SCREEN] is False:
            await function_B(websocket, user_msg[websocket])


if __name__ == '__main__':
    # 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()