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'use strict'
var util = require('util')
var TrackerBase = require('./tracker-base.js')

var Tracker = module.exports = function (name, todo) {
  TrackerBase.call(this, name)
  this.workDone = 0
  this.workTodo = todo || 0
}
util.inherits(Tracker, TrackerBase)

Tracker.prototype.completed = function () {
  return this.workTodo === 0 ? 0 : this.workDone / this.workTodo
}

Tracker.prototype.addWork = function (work) {
  this.workTodo += work
  this.emit('change', this.name, this.completed(), this)
}

Tracker.prototype.completeWork = function (work) {
  this.workDone += work
  if (this.workDone > this.workTodo) this.workDone = this.workTodo
  this.emit('change', this.name, this.completed(), this)
}

Tracker.prototype.finish = function () {
  this.workTodo = this.workDone = 1
  this.emit('change', this.name, 1, this)
}