export default class ConfigManager{

    constructor(){}

    init(){
        console.log("[CONFIG] Reading config environment variables.")

        // Initialize mqtt url
        var mqttUrlEnv = process.env.MQTT_URL;
        if(mqttUrlEnv){
            this.mqttUrl = mqttUrlEnv;
            console.log("[CONFIG] MQTT_URL set to ["+mqttUrlEnv+"].")
        }else{
            this.mqttUrl = "mqtt://localhost:1883"
            console.log("[CONFIG] MQTT_URL set to default [mqtt://localhost].")
        }

        // Initialize auth token
        var mqttAuthTokenEnv = process.env.MQTT_AUTH_TOKEN
        if(mqttAuthTokenEnv){
            this.mqttAuthToken = mqttAuthTokenEnv;
            console.log("[CONFIG] MQTT_AUTH_TOKEN set to ["+mqttAuthTokenEnv+"].")
        }else{
            this.mqttAuthToken = "skl20g67bm1";
            console.log("[CONFIG] MQTT_AUTH_TOKEN set to default value [skl20g67bm1].");
        }

        // Initialize mqtt options
        this.mqttOptions = {
            keepalive: 60,
            reconnectPeriod: 1000,
            protocolVersion: 3,
            protocolId: 'MQIsdp',
            clean: true,
            encoding: 'utf8'
        }
        
        // Initialize mqtt clientId
        var mqttClientIdEnv = process.env.MQTT_CLIENTID
        if(mqttClientIdEnv){
            this.mqttOptions.clientId = mqttClientIdEnv
            console.log("[CONFIG] MQTT_CLIENTID read and set to ["+mqttClientIdEnv+"].")
        }else{
            this.mqttOptions.clientId = "advancedMqttBridge"
            console.log("[CONFIG] MQTT_CLIENTID set to default [advancedMqttBridge].")
        }

        // Initialize mqtt username
        var mqttUsernameEnv = process.env.MQTT_USERNAME
        if(mqttUsernameEnv){
            this.mqttOptions.username = mqttUsernameEnv
            console.log("[CONFIG] MQTT_USERNAME read and set to ["+mqttUsernameEnv+"].")
        }else{
            this.mqttOptions.username = "advancedMqttBridge"
            console.log("[CONFIG] MQTT_USERNAME set to default [advancedMqttBridge].")
        }

        // Initialize mqtt password
        var mqttPasswordEnv = process.env.MQTT_PASSWORD
        if(mqttPasswordEnv){
            this.mqttOptions.password = mqttPasswordEnv
            console.log("[CONFIG] MQTT_PASSWORD read and set to ["+mqttPasswordEnv+"].")
        }else{
            this.mqttOptions.password = "mqttPassword#123"
            console.log("[CONFIG] MQTT_PASSWORD set to default [mqttPassword#123].")
        }
    }

    getMqttAuthToken(){
        return this.mqttAuthToken;
    }

    getMqttUrl(){
        return this.mqttUrl;
    }

    getMqttOptions(){
        return this.mqttOptions;
    }

}