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'use strict'
var util = require('util')
var stream = require('readable-stream')
var delegate = require('delegates')
var Tracker = require('./tracker.js')
var TrackerStream = module.exports = function (name, size, options) {
stream.Transform.call(this, options)
this.tracker = new Tracker(name, size)
this.name = name
this.id = this.tracker.id
this.tracker.on('change', delegateChange(this))
}
util.inherits(TrackerStream, stream.Transform)
function delegateChange (trackerStream) {
return function (name, completion, tracker) {
trackerStream.emit('change', name, completion, trackerStream)
}
}
TrackerStream.prototype._transform = function (data, encoding, cb) {
this.tracker.completeWork(data.length ? data.length : 1)
this.push(data)
cb()
}
TrackerStream.prototype._flush = function (cb) {
this.tracker.finish()
cb()
}
delegate(TrackerStream.prototype, 'tracker')
.method('completed')
.method('addWork')
.method('finish')