const Modbus = require('jsmodbus')
var fs = require("fs")
const net = require('net')
const mqtt = require("mqtt");

const { InfluxDB, Point } = require('@influxdata/influxdb-client')
const socket = new net.Socket()
const modbusClient = new Modbus.client.TCP(socket, 0);
let mqttClient = null;
const options = {
    'host': '192.168.178.63',
    'port': 502
};
let config = null;

let influxOrg = 'heatctrlOrg'
let influxBucket = 'measurements'
const influxUrl = 'http://influxdb:8086'

let influxClient = null;
let influxWriteClient = null;

let inputValues = {};
let configuredInputs = {};


// for reconnecting see node-net-reconnect npm module

// use socket.on('open', ...) when using serialport
socket.on('connect', function () {

    console.log("socket connected starting interval timer");
    setInterval(() => {
        requestTemps();
    }, config.interval);
});
fs.readFile('config.json', function (err, data) {
    if (err) {
        return console.error(err);
    } else {
        config = JSON.parse(data.toString());

        configuredInputs = config.inputs;
        configuredInputs.forEach(element => {
            inputValues[element.label] = { value: null, synced: false, unitConversionDivider: 1 };
        });
        console.log("config read");
        console.log("now connecting to influxdb");
        influxClient = new InfluxDB({ url: influxUrl, token: config.influxToken });
        influxWriteClient = influxClient.getWriteApi(influxOrg, influxBucket, 'ms');
        console.log("connected to influxdb, now trying to connect to modbus tcp and mqtt");
        socket.connect(options);
        mqttClient = mqtt.connect(config.mqttBrokerAddress, {
            username: config.mqttUser,
            password: config.mqttPassword
        });
    }
});
async function dispatchModbus() {
    //console.log(CF2values);
    calculateLogic();
    writeToInflux();
    clearSynced();
}
async function clearSynced() {
    for (const key in inputValues) {
        if (Object.hasOwnProperty.call(inputValues, key)) {
            inputValues[key].synced = false;
        }
    }
}
async function requestTemps() {
    configuredInputs.forEach(element => {

        modbusClient.readInputRegisters(element.register, (element.type === "u32" | element.type === "s32") ? 2 : 1).then(function (resp) {
            let value = null;
            switch (element.type) {
                case "u32": {
                    value = resp.response._body._valuesAsBuffer.readUInt32BE() / element.unitConversionDivider;
                } break;
                case "s32": {
                    value = resp.response._body._valuesAsBuffer.readInt32BE() / element.unitConversionDivider;
                } break;
                case "u16": {
                    value = resp.response._body._valuesAsBuffer.readUInt16BE() / element.unitConversionDivider;
                } break;
                case "s16": {
                    value = resp.response._body._valuesAsBuffer.readInt16BE() / element.unitConversionDivider;
                } break;
                case "bool": {
                    value = resp.response._body._values[0] / element.unitConversionDivider;
                } break;
                default: {
                    value = resp.response._body._values[0] / element.unitConversionDivider;
                } break;
            }
            inputValues[element.label] = { value: value, synced: true };
            let allSynced = true;
            /*
                if (resp.request._body.start === 9169) {
                    console.log(resp);
                    console.log(resp.response._body._values[0]);
                }
            */
            for (const key in inputValues) {
                if (Object.hasOwnProperty.call(inputValues, key)) {
                    const element = inputValues[key];
                    allSynced &= element.synced;
                }
            }
            if (allSynced) {
                dispatchModbus();
            }
        }, console.error);
    });
}
async function writeToInflux() {
    for (const key in inputValues) {
        if (Object.hasOwnProperty.call(inputValues, key)) {
            let point = new Point('CF2').floatField(key, inputValues[key].value);
            influxWriteClient.writePoint(point);        
        }
    }
    influxWriteClient.flush();
}
async function sendMQTT(topic, msg) {
    let mqttConfig = config.UmschichtungSolar.mqtt;
    if (typeof mqttClient !== 'undefined' || mqttClient !== null) {
        if (mqttClient.connected) {
            mqttClient.publish(topic, msg, { retain: true });
            //console.log(msg);
        } else {
            console.log("client not connected to the mqtt broker");
        }
    } else {
        console.log("mqttClient is undefined or null");
    }

    //send status over mqtt
    let val = 0.0;
    if (msg == mqttConfig.msgOn) {
        val = 100.0;
    } else if (msg == mqttConfig.msgOff) {
        val = 0.0;
    }
    let point = new Point('Solarumschichtung').floatField("pumpePercent", val);
    influxWriteClient.writePoint(point);
    influxWriteClient.flush();
}
let outputRegler1 = false;
let outputRegler2 = false;
async function calculateLogic() {
    //Notumschichtung regler 1
    let umschichtungSolar = config.UmschichtungSolar;
    let notumschichtung = umschichtungSolar.Notumschichtung
    let temptNotumschichtung = inputValues[notumschichtung.Temperaturlabel].value;
    let TonNotumschichtung = notumschichtung.Ton;
    let ToffNotumschichtung = notumschichtung.Toff;
    
    //mqtt relais 
    //console.log(umschichtungSolar);                 
    let topic = umschichtungSolar.mqtt.ctrlTopic;
    
    let msgOn = umschichtungSolar.mqtt.msgOn;
    let msgOff = umschichtungSolar.mqtt.msgOff;
    
    //Differenzregelung
    let differenzregelung = umschichtungSolar.Differenzregelung
    let quellTemperatur = inputValues[differenzregelung.QuelltemperaturLabel].value;
    let zielTemperatur = inputValues[differenzregelung.ZieltemperaturLabel].value;
    let dTon = differenzregelung.dTon;
    let dToff = differenzregelung.dToff;

    //Freigabe Holzofen
    let kesselstatus = inputValues["Kesselstatus"].value;
    let freigabeHolzofen = kesselstatus === umschichtungSolar.FreigabeHolzofen.KesselstatusAus ? true : false;

    if (temptNotumschichtung >= TonNotumschichtung) {
        outputRegler1 = true;
        
    } else if (temptNotumschichtung <= ToffNotumschichtung) {
        outputRegler1 = false;
    }

    let diff = quellTemperatur - zielTemperatur;
    if(diff >= dTon){
        outputRegler2 = true;
    }else if (diff <= dToff) {
        outputRegler2 = false;
    }

    let point = new Point('Solarumschichtung').floatField("regler1", outputRegler1 ? 100.0 : 0.0);
    influxWriteClient.writePoint(point);
    point =  new Point('Solarumschichtung').floatField("regler2", outputRegler2 ? 100.0 : 0.0);
    influxWriteClient.writePoint(point);
    point =  new Point('Solarumschichtung').floatField("freigabeHolzofen", freigabeHolzofen ? 100.0 : 0.0);
    influxWriteClient.writePoint(point);
    influxWriteClient.flush();

    if(freigabeHolzofen && outputRegler1 && outputRegler2){
        sendMQTT(topic, msgOn);
    }else{
        sendMQTT(topic, msgOff);
    }
}