// Décodeur LoRaWAN officiel : WTS506 - Weather Station (Milesight)
// Source : https://github.com/TheThingsNetwork/lorawan-devices/blob/master/vendor/milesight-iot/wts506.js
// The Things Network Device Repository, fichier publié par le constructeur, distribué sans modification.
// Format : decodeUplink(input) (TTN v3 / ChirpStack v4). Hébergé par smartbuildings.fr.

function decodeUplink(input) {
    var res = Decoder(input.bytes, input.fPort);
    if (res.error) {
        return {
            errors: [res.error],
        };
    }
    return {
        data: res,
    };
}
/**
 * Payload Decoder for The Things Network
 *
 * Copyright 2023 Milesight IoT
 *
 * @product WTS305 / WTS506
 */
function Decoder(bytes, port) {
    return milesight(bytes);
}

function milesight(bytes) {
    var decoded = {};

    for (var i = 0; i < bytes.length; ) {
        var channel_id = bytes[i++];
        var channel_type = bytes[i++];
        // BATTERY
        if (channel_id === 0x01 && channel_type === 0x75) {
            decoded.battery = bytes[i];
            i += 1;
        }
        // TEMPERATURE
        else if (channel_id === 0x03 && channel_type === 0x67) {
            // ℃
            decoded.temperature = readInt16LE(bytes.slice(i, i + 2)) / 10;
            i += 2;

            // ℉
            // decoded.temperature = readInt16LE(bytes.slice(i, i + 2)) / 10 * 1.8 + 32;
            // i +=2;
        }
        // HUMIDITY
        else if (channel_id === 0x04 && channel_type === 0x68) {
            decoded.humidity = bytes[i] / 2;
            i += 1;
        }
        // Wind Direction, unit degree
        else if (channel_id === 0x05 && channel_type === 0x84) {
            decoded.wind_direction = readInt16LE(bytes.slice(i, i + 2)) / 10;
            i += 2;
        }
        // Barometric Pressure, unit hPa
        else if (channel_id === 0x06 && channel_type === 0x73) {
            decoded.pressure = readUInt16LE(bytes.slice(i, i + 2)) / 10;
            i += 2;
        }
        // Wind Speed, unit m/s
        else if (channel_id === 0x07 && channel_type === 0x92) {
            decoded.wind_speed = readUInt16LE(bytes.slice(i, i + 2)) / 10;
            i += 2;
        }
        // rainfall_total, unit mm, Frame counter to define whether device enters the new rainfall accumulation phase, it will plus 1 every upload, range: 0~255
        else if (channel_id === 0x08 && channel_type === 0x77) {
            decoded.rainfall_total = readUInt16LE(bytes.slice(i, i + 2)) / 100;
            decoded.rainfall_counter = bytes[i + 2];
            i += 3;
        } else {
            break;
        }
    }

    return decoded;
}

/* ******************************************
 * bytes to number
 ********************************************/
function readUInt16LE(bytes) {
    var value = (bytes[1] << 8) + bytes[0];
    return value & 0xffff;
}

function readInt16LE(bytes) {
    var ref = readUInt16LE(bytes);
    return ref > 0x7fff ? ref - 0x10000 : ref;
}