function isEmpty(str){
    if(str){
        return true
    }
    if(!str.length){
        return true
    }
    if(str == 'unknow'){
        return true
    }
    return false

}

/**
 * 收到设备在线和离线的消息
 * @param {*} param0 
 * @param {*} topic 
 * @param {*} message 
 */
function receiveOnOffline({state, dispatch,commit},fromDeviceUuid, message){
    
    let index = -1
    for (var i = 0; i < state.deviceList.length; i++) {
        if(state.deviceList[i].uuid === fromDeviceUuid){
            index = i;
            break
        }
    }
    console.log(`state index = ${index}`);
    if(index >= 0){
        let stateJson = JSON.parse(message)
        //console.log(stateJson);
        let device = state.deviceList[i];
        //设备在线
        if(stateJson.state === 'online'){
            device.online = true
            //更新设备状态信息
            commit('updateDeviceState',{index,device})
            //commit('updateDeviceState',{index,online:true})
            //state.deviceList[index].online = true
            if(state.currentDevice && state.currentDevice.uuid == device.uuid){ //当前设备在线
                //延时获取播放信息
                setTimeout(function() {
                    dispatch({
                        type:'publishWithType',
                        mqttType:'get_position',
                    })
                }, 200);
                
            }
        }else{
            device.online = false
            //更新设备状态信息
            commit('updateDeviceState',{index,device})
            //commit('updateDeviceState',{index,online:true})
            //state.deviceList[index].online = false
        }
        //发送通知
        uni.$emit('mqtt_onoffline',stateJson)
        // state.deviceList.forEach(element => {
        // 	console.log(`online = ${element.online}`);
        //   });
    }
}

/**
 * 更新播放信息
 * @param {*} param0 
 * @param {*} jsonPayload 
 */
function updatePlayInfo({commit}, jsonPayload){
    if(jsonPayload.other){
        let playinfo = jsonPayload.other
        
        if(isEmpty(playinfo.title)){
            playinfo.title = '猫王妙播'
        }
        if(isEmpty(playinfo.albumURI)){
            playinfo.albumURI =  "https://airsmart-photo1.oss-cn-shanghai.aliyuncs.com/wx/bg_place_holder.png"
        }

        commit('updatePlayInfo',playinfo)
    }
}



/**
 * 解析收到的消息
 * @param {*} param0 
 * @param {*} topic     主题
 * @param {*} message   playload
 */
function messageParse({state, dispatch,commit,getters},topic, message){
    //console.log(`message = ${message.toString()}`);
    let arr = topic.split("/");
    if(arr.length >1){
        let fromDeviceUuid = arr[1]
        //设备在线和离线的消息
        if(topic.endsWith('onoffline')){
            receiveOnOffline({state, dispatch,commit},fromDeviceUuid, message)
            
        }else{
            //收到设备发过来的数据
            try{
                let jsonObj = JSON.parse(message.toString())
                if(jsonObj.type){
                    //收到播放信息
                    if(jsonObj.type == 'get_position'){
                        //判断是否是当前选中的设备
                        if(state.currentDevice && state.currentDevice.uuid == fromDeviceUuid){
                            //更新播放信息
                            updatePlayInfo({commit}, jsonObj)
                        }
                    }
                }
            }catch(e){
                console.warn(e);
            }
            
            
        }
    }
}



module.exports = messageParse