/**
 * Payload Encoder
 *
 * Copyright 2025 Milesight IoT
 *
 * @product EM310-UDL
 */
var RAW_VALUE = 0x00;

/* eslint no-redeclare: "off" */
/* eslint-disable */
// Chirpstack v4
function encodeDownlink(input) {
    var encoded = milesightDeviceEncode(input.data);
    return { bytes: encoded };
}

// Chirpstack v3
function Encode(fPort, obj) {
    return milesightDeviceEncode(obj);
}

// The Things Network
function Encoder(obj, port) {
    return milesightDeviceEncode(obj);
}
/* eslint-enable */

function milesightDeviceEncode(payload) {
    var encoded = [];

    if ("reboot" in payload) {
        encoded = encoded.concat(reboot(payload.reboot));
    }
    if ("collection_interval" in payload) {
        encoded = encoded.concat(setCollectionInterval(payload.collection_interval));
    }
    if ("report_interval" in payload) {
        encoded = encoded.concat(setReportInterval(payload.report_interval));
    }
    if ("distance_alarm_config" in payload) {
        encoded = encoded.concat(setDistanceAlarmConfig(payload.distance_alarm_config));
    }

    return encoded;
}

/**
 * reboot device
 * @param {number} reboot values: (0: no, 1: yes)
 * @example { "reboot": 1 }
 */
function reboot(reboot) {
    var yes_no_map = { 0: "no", 1: "yes" };
    var yes_no_values = getValues(yes_no_map);
    if (yes_no_values.indexOf(reboot) === -1) {
        throw new Error("reboot must be one of " + yes_no_values.join(", "));
    }

    if (getValue(yes_no_map, reboot) === 0) {
        return [];
    }
    return [0xff, 0x10, 0xff];
}

/**
 * set collection interval
 * @param {number} collection_interval unit: second, range: [10, 60]
 * @example { "collection_interval": 300 }
 */
function setCollectionInterval(collection_interval) {
    if (typeof collection_interval !== "number") {
        throw new Error("collection_interval must be a number");
    }
    if (collection_interval < 10 || collection_interval > 60) {
        throw new Error("collection_interval must be in range [10, 60]");
    }

    var buffer = new Buffer(4);
    buffer.writeUInt8(0xff);
    buffer.writeUInt8(0x02);
    buffer.writeUInt16LE(collection_interval);
    return buffer.toBytes();
}

/**
 * report interval configuration
 * @param {number} report_interval uint: second
 * @example payload: { "report_interval": 600 }
 */
function setReportInterval(report_interval) {
    if (typeof report_interval !== "number") {
        throw new Error("report_interval must be a number");
    }
    if (report_interval < 1) {
        throw new Error("report_interval must be greater than 1");
    }

    var buffer = new Buffer(4);
    buffer.writeUInt8(0xff);
    buffer.writeUInt8(0x03);
    buffer.writeUInt16LE(report_interval);
    return buffer.toBytes();
}

/**
 * set distance threshold alarm configuration
 * @param {object} distance_alarm_config
 * @param {number} distance_alarm_config.condition values: (0: disable, 1: below, 2: above, 3: between, 4: outside)
 * @param {number} distance_alarm_config.threshold_min condition=(below, within, outside)
 * @param {number} distance_alarm_config.threshold_max condition=(above, within, outside)
 * @param {number} distance_alarm_config.lock_time
 * @param {number} distance_alarm_config.continue_time
 * @param {number} distance_alarm_config.alarm_release_enable values: (0: disable, 1: enable)
 */
function setDistanceAlarmConfig(distance_alarm_config) {
    var condition = distance_alarm_config.condition;
    var threshold_min = distance_alarm_config.threshold_min;
    var threshold_max = distance_alarm_config.threshold_max;
    var lock_time = distance_alarm_config.lock_time;
    var continue_time = distance_alarm_config.continue_time;
    var alarm_release_enable = distance_alarm_config.alarm_release_enable;

    var condition_map = { 0: "disable", 1: "below", 2: "above", 3: "between", 4: "outside" };
    var condition_values = getValues(condition_map);
    if (condition_values.indexOf(condition) === -1) {
        throw new Error("distance_alarm_config.condition must be one of " + condition_values.join(", "));
    }
    var enable_map = { 0: "disable", 1: "enable" };
    var enable_values = getValues(enable_map);
    if (enable_values.indexOf(alarm_release_enable) === -1) {
        throw new Error("distance_alarm_config.alarm_release_enable must be one of " + enable_values.join(", "));
    }

    var data = 0x00;
    data |= getValue(condition_map, condition);
    data |= 1 << 3;
    data |= getValue(enable_map, alarm_release_enable) << 7;

    var buffer = new Buffer(11);
    buffer.writeUInt8(0xff);
    buffer.writeUInt8(0x06);
    buffer.writeUInt8(data);
    buffer.writeInt16LE(threshold_min * 10);
    buffer.writeInt16LE(threshold_max * 10);
    buffer.writeUInt16LE(lock_time);
    buffer.writeUInt16LE(continue_time);
    return buffer.toBytes();
}

function getValues(map) {
    var values = [];
    for (var key in map) {
        values.push(RAW_VALUE ? parseInt(key) : map[key]);
    }
    return values;
}

function getValue(map, value) {
    if (RAW_VALUE) return value;

    for (var key in map) {
        if (map[key] === value) {
            return parseInt(key);
        }
    }

    throw new Error("not match in " + JSON.stringify(map));
}

function Buffer(size) {
    this.buffer = new Array(size);
    this.offset = 0;

    for (var i = 0; i < size; i++) {
        this.buffer[i] = 0;
    }
}

Buffer.prototype._write = function (value, byteLength, isLittleEndian) {
    var offset = 0;
    for (var index = 0; index < byteLength; index++) {
        offset = isLittleEndian ? index << 3 : (byteLength - 1 - index) << 3;
        this.buffer[this.offset + index] = (value >> offset) & 0xff;
    }
};

Buffer.prototype.writeUInt8 = function (value) {
    this._write(value, 1, true);
    this.offset += 1;
};

Buffer.prototype.writeInt8 = function (value) {
    this._write(value < 0 ? value + 0x100 : value, 1, true);
    this.offset += 1;
};

Buffer.prototype.writeUInt16LE = function (value) {
    this._write(value, 2, true);
    this.offset += 2;
};

Buffer.prototype.writeInt16LE = function (value) {
    this._write(value < 0 ? value + 0x10000 : value, 2, true);
    this.offset += 2;
};

Buffer.prototype.writeUInt32LE = function (value) {
    this._write(value, 4, true);
    this.offset += 4;
};

Buffer.prototype.writeInt32LE = function (value) {
    this._write(value < 0 ? value + 0x100000000 : value, 4, true);
    this.offset += 4;
};

Buffer.prototype.writeD2DCommand = function (value, defaultValue) {
    if (typeof value !== "string") {
        value = defaultValue;
    }
    if (value.length !== 4) {
        throw new Error("d2d_cmd length must be 4");
    }
    this.buffer[this.offset] = parseInt(value.substr(2, 2), 16);
    this.buffer[this.offset + 1] = parseInt(value.substr(0, 2), 16);
    this.offset += 2;
};

Buffer.prototype.toBytes = function () {
    return this.buffer;
};