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const {constants} = require('../../lifx');
const Packet = {
size: 13
};
/**
* Converts packet specific data from a buffer to an object
* @param {Buffer} buf Buffer containing only packet specific data no header
* @return {Object} Information contained in packet
*/
Packet.toObject = function(buf) {
const obj = {};
let offset = 0;
if (buf.length !== this.size) {
throw new Error('Invalid length given for setColor LIFX packet');
}
obj.stream = buf.readUInt8(offset);
offset += 1;
obj.color = {};
obj.color.hue = buf.readUInt16LE(offset);
offset += 2;
obj.color.saturation = buf.readUInt16LE(offset);
offset += 2;
obj.color.brightness = buf.readUInt16LE(offset);
offset += 2;
obj.color.kelvin = buf.readUInt16LE(offset);
offset += 2;
obj.duration = buf.readUInt32LE(offset);
offset += 4;
return obj;
};
/**
* Converts the given packet specific object into a packet
* @param {Object} obj object with configuration data
* @param {Object} obj.color an objects with colors to set
* @param {Number} obj.color.hue between 0 and 65535
* @param {Number} obj.color.saturation between 0 and 65535
* @param {Number} obj.color.brightness between 0 and 65535
* @param {Number} obj.color.kelvin between 2500 and 9000
* @param {Number} [obj.duration] transition time in milliseconds
* @return {Buffer} packet
*/
Packet.toBuffer = function(obj) {
const buf = Buffer.alloc(this.size);
buf.fill(0);
let offset = 0;
// obj.stream field has unknown function so leave it as 0
offset += 1;
if (typeof obj.hue !== 'number' && obj.hue < 0 || obj.hue > 65535) {
throw new RangeError('Invalid color hue given for setColor LIFX packet, must be a number between 0 and 65535');
}
buf.writeUInt16LE(obj.hue, offset);
offset += 2;
if (typeof obj.saturation !== 'number' && obj.saturation < 0 || obj.saturation > 65535) {
throw new RangeError('Invalid color saturation given for setColor LIFX packet, must be a number between 0 and 65535');
}
buf.writeUInt16LE(obj.saturation, offset);
offset += 2;
if (typeof obj.brightness !== 'number' && obj.brightness < 0 || obj.brightness > 65535) {
throw new RangeError('Invalid color brightness given for setColor LIFX packet, must be a number between 0 and 65535');
}
buf.writeUInt16LE(obj.brightness, offset);
offset += 2;
if (obj.kelvin === undefined) {
obj.kelvin = constants.HSBK_DEFAULT_KELVIN;
}
if (typeof obj.kelvin !== 'number' && obj.kelvin < 2500 || obj.kelvin > 9000) {
throw new RangeError('Invalid color kelvin given for setColor LIFX packet, must be a number between 2500 and 9000');
}
buf.writeUInt16LE(obj.kelvin, offset);
offset += 2;
// Duration is 0 by default
if (obj.duration !== undefined) {
buf.writeUInt32LE(obj.duration, offset);
}
offset += 4;
return buf;
};
module.exports = Packet;
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