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const {constants} = require('../../lifx');
const Packet = {
size: 15
};
/**
* 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 setColorZones LIFX packet');
}
obj.startIndex = buf.readUInt8(offset);
offset += 1;
obj.endIndex = 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;
obj.apply = buf.readUInt8(offset);
offset += 1;
return obj;
};
/**
* Converts the given packet specific object into a packet
* @param {Object} obj object with configuration data
* @param {Number} obj.startIndex between 0 and 255
* @param {Number} obj.endIndex between 0 and 255
* @param {Object} obj.color an object 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
* @param {Number} obj.apply value 0 (NO_APPLY), 1 (APPLY) or 2 (APPLY_ONLY)
* @return {Buffer} packet
*/
Packet.toBuffer = function(obj) {
const buf = Buffer.alloc(this.size);
buf.fill(0);
let offset = 0;
Iif (typeof obj.startIndex !== 'number' && obj.startIndex < 0 || obj.startIndex > 255) {
throw new RangeError('Invalid startIndex value given for setColorZones LIFX packet, must be a number between 0 and 255');
}
buf.writeUInt8(obj.startIndex, offset);
offset += 1;
Iif (typeof obj.endIndex !== 'number' && obj.endIndex < 0 || obj.endIndex > 255) {
throw new RangeError('Invalid endIndex value given for setColorZones LIFX packet, must be a number between 0 and 255');
}
buf.writeUInt8(obj.endIndex, offset);
offset += 1;
Iif (typeof obj.hue !== 'number' || obj.hue < 0 || obj.hue > 65535) {
throw new RangeError('Invalid color hue given for setColorZones LIFX packet, must be a number between 0 and 65535');
}
buf.writeUInt16LE(obj.hue, offset);
offset += 2;
Iif (typeof obj.saturation !== 'number' || obj.saturation < 0 || obj.saturation > 65535) {
throw new RangeError('Invalid color saturation given for setColorZones LIFX packet, must be a number between 0 and 65535');
}
buf.writeUInt16LE(obj.saturation, offset);
offset += 2;
Iif (typeof obj.brightness !== 'number' || obj.brightness < 0 || obj.brightness > 65535) {
throw new RangeError('Invalid color brightness given for setColorZones LIFX packet, must be a number between 0 and 65535');
}
buf.writeUInt16LE(obj.brightness, offset);
offset += 2;
Iif (obj.kelvin === undefined) {
obj.kelvin = constants.HSBK_DEFAULT_KELVIN;
}
Iif (typeof obj.kelvin !== 'number' && obj.kelvin < 2500 || obj.kelvin > 9000) {
throw new RangeError('Invalid color kelvin given for setColorZones LIFX packet, must be a number between 2500 and 9000');
}
buf.writeUInt16LE(obj.kelvin, offset);
offset += 2;
// Duration is 0 by default
Eif (obj.duration !== undefined) {
buf.writeUInt32LE(obj.duration, offset);
}
offset += 4;
Iif (obj.apply === undefined) {
throw new TypeError('obj.apply value must be given for setColorZones LIFX packet');
}
Iif (typeof obj.apply !== 'number' && obj.apply < 0 || obj.apply > 2) {
throw new RangeError('Invalid apply value given for setColorZones LIFX packet, must be a number between 0 and 2');
}
buf.writeUInt8(obj.apply, offset);
offset += 1;
return buf;
};
module.exports = Packet;
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