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