/**
* Payload Decoder
*
* Copyright 2025 Milesight IoT
*
* @product WS503 v1
*/
function Decode(fPort, bytes) {
    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++];


        // IPSO VERSION
        if (channel_id === 0xff && channel_type === 0x01) {
            decoded.ipso_version = readProtocolVersion(bytes[i]);
            i += 1;
        }
        // HARDWARE VERSION
        else if (channel_id === 0xff && channel_type === 0x09) {
            decoded.hardware_version = readHardwareVersion(bytes.slice(i, i + 2));
            i += 2;
        }
        // FIRMWARE VERSION
        else if (channel_id === 0xff && channel_type === 0x0a) {
            decoded.firmware_version = readFirmwareVersion(bytes.slice(i, i + 2));
            i += 2;
        }
        // DEVICE STATUS
        else if (channel_id === 0xff && channel_type === 0x0b) {
            decoded.device_status = 1;
            i += 1;
        }
        // LORAWAN CLASS TYPE
        else if (channel_id === 0xff && channel_type === 0x0f) {
            decoded.lorawan_class = bytes[i];
            i += 1;
        }
        // SERIAL NUMBER
        else if (channel_id === 0xff && channel_type === 0x08) {
            decoded.sn = readSerialNumber(bytes.slice(i, i + 6));
            i += 6;
        }
        // SWITCH STATE
        else if (channel_id === 0xff && channel_type === 0x29) {
            // payload (0 0 0 0 0 0 0 0)
            //  Switch    3 2 1   3 2 1
            //          ------- -------
            // bit mask  change   state
            decoded.switch_1 = bytes[i] & 1;
            decoded.switch_1_change = (bytes[i] >> 4) & 1;


            decoded.switch_2 = (bytes[i] >> 1) & 1;
            decoded.switch_2_change = (bytes[i] >> 5) & 1;


            decoded.switch_3 = (bytes[i] >> 2) & 1;
            decoded.switch_3_change = (bytes[i] >> 6) & 1;
            i += 1;
        } else {
            break;
        }
    }


    return decoded;
}


function readProtocolVersion(bytes) {
    var major = (bytes & 0xf0) >> 4;
    var minor = bytes & 0x0f;
    return "v" + major + "." + minor;
}


function readHardwareVersion(bytes) {
    var major = bytes[0] & 0xff;
    var minor = (bytes[1] & 0xff) >> 4;
    return "v" + major + "." + minor;
}


function readFirmwareVersion(bytes) {
    var major = bytes[0] & 0xff;
    var minor = bytes[1] & 0xff;
    return "v" + major + "." + minor;
}


function readSerialNumber(bytes) {
    var temp = [];
    for (var idx = 0; idx < bytes.length; idx++) {
        temp.push(("0" + (bytes[idx] & 0xff).toString(16)).slice(-2));
    }
    return temp.join("");
}