import asyncio
import json


import uvicorn
from fastapi import FastAPI
import paho.mqtt.client as mqtt

app = FastAPI()


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(40)
    user_sched.pop(username)
    print("结束推流")
    close_stream(username, device)


async def task_start(username, device):
    print("开始推流")
    push_stream(username, device)
    task = asyncio.create_task(close(username, device))
    user_sched[username] = task


@app.get("/video/{username}/{device}")
async def startup(username, device):
    try:
        if username not in user_sched:
            await task_start(username, device)
        else:
            t = user_sched[username]
            # 取消重来
            t.cancel()
            await task_start(username, device)
    except:
        pass


def push_stream(username, device):
    MQTT = MQTTClient(broker, port, device, username, username)
    try:
        MQTT.start()
        MQTT.push()
    except Exception as e:
        # print(e)
        pass


def close_stream(username, device):
    try:
        MQTT = MQTTClient(broker, port, device, username, username)
        MQTT.start()
        MQTT.close()
    except Exception as e:
        # print(e)
        pass


if __name__ == '__main__':
    broker = 'mqtt.lihaink.cn'
    port = 1883
    uvicorn.run(app, host="127.0.0.1", port=8001)