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import async from 'async';
import UsbLed from './drivers/usbled.js';
/**
* class BuildLight
*
* @param {Object} opts: optional
* - scheme: color scheme array, defaults to [ 'red', 'green', 'blue' ]
* scheme allows flexibility to use BuildLight with various Delcom devices (RGB, RGY)
* - usbled: path to usbled installation, if not specified then it will try to
* find a usbled installation at /sys/bus/usb/drivers/usbled/
* - interval: continuous task (e.g. blink) interval in milliseconds
* switching between displaying color and no color, default to 500ms
* - gen: generation number of the build light
* find the part number at the bottom of your device
* and check it at Delcom product page https://www.delcomproducts.com/products_USBLMP.asp
*/
class BuildLight {
constructor(opts) {
const RGB = [ 'red', 'green', 'blue' ];
const INTERVAL = 500;
const GEN = 1;
this.opts = opts || {};
this.scheme = this.opts.scheme || RGB;
this.interval = this.opts.interval || INTERVAL;
this.platform = this.opts.platform || process.platform;
this.gen = this.opts.gen || GEN;
this._driver();
this._colours();
}
/**
* Switch on all colours in the color scheme.
*/
on() {
const self = this;
this.scheme.forEach(function (colour) {
self.driver.on(colour);
});
}
/**
* Switch off all colours in the color scheme.
*/
off() {
const self = this;
this.scheme.forEach(function (colour) {
self.driver.off(colour);
});
}
/**
* Blink the specified colour.
*
* @param {String} colour: a colour from the scheme, default scheme either red, green, or blue
* if no colour is specified then default to display all colours from the scheme
* @param {Function} cb: callback with error arg if there's any interruption
*/
blink(colour, cb) {
if (!cb) {
cb = colour;
colour = null;
}
const self = this;
this.continuous = true;
function task(cb) {
// only timeout if continuous, otherwise finish off a.s.a.p
function _do(cb) {
if (self.continuous) {
setTimeout(cb, self.interval);
} else {
cb();
}
}
if (self.continuous) {
self[colour || 'on']();
_do(function () {
self.off();
_do(cb);
});
} else {
cb('Stop blinking...');
}
}
async.forever(task, cb);
}
/**
* Stop blinking.
* Wait for interval before calling callback to allow
* in-progress blink to finish.
*
* @param {Function} cb: callback with error arg if there's any interruption
*/
unblink(cb) {
this.continuous = false;
setTimeout(cb, this.interval);
}
/**
* Select a driver to use based on platform.
* BuildLight currently supports Linux platform only, contributions for other platforms are welcome.
* - Linux platform uses usbled driver.
*/
_driver() {
if (this.platform === 'linux' && this.gen === 1) {
this.driver = new (UsbLed)(this.opts.usbled);
} else {
throw new Error('Unsupported platform ' + this.platform + ' with device generation ' + this.gen);
}
}
/**
* Initialise colour method based on colour scheme.
* If scheme is [ 'red', 'green', 'blue' ], then you use:
* buildLight.red();
* buildLight.green();
* buildLight.blue();
* Each colour method will switch off all colours, then switch on one particular colour.
*/
_colours() {
const self = this;
this.scheme.forEach(function (colour) {
BuildLight.prototype[colour] = function () {
self.off();
self.driver.on(colour);
};
});
}
}
export {
BuildLight as default
};
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