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class ProgressStats {
constructor (trackerName, totalTasks) {
this.trackerName = trackerName
this.totalTasks = totalTasks
this.taskCounter = 0
}
logNext () {
this.taskCounter++
if (!this.beginTime) {
this.beginTime = new Date()
}
}
/**
* Begin a new task. Print the current progress and then increment the number of tasks.
* @param {string} A short message about the current task progress
* @param {[boolean]} logTimeLeft whether or not to log the time left.
*/
beginTask (message, logTimeLeft) {
this.printStats(message, logTimeLeft)
this.logNext()
}
/**
* Print the current progress.
* @param {string} A short message about the current task progress
* @param {[boolean]} logTimeLeft whether or not to log the time left.
*/
printStats (message, logTimeLeft) {
message = `${message}; ${this.trackerName} progress: ${this.getPercentage()}% done`
if (logTimeLeft) {
message = `${message} - ${this.getTimeLeft()} left`
}
console.log(message)
}
/**
* calculates the percentage of finished downloads
* @returns {string}
*/
getPercentage () {
var current = (this.taskCounter / this.totalTasks)
return Math.round(current * 1000.0) / 10.0
}
/**
* calculates the time left and outputs it in human readable format
* calculation is based on the average time per task so far
*
* @returns {string}
*/
getTimeLeft () {
if (this.taskCounter === 0) return '?'
const averageTimePerTask = (Date.now() - this.beginTime.getTime()) / this.taskCounter
var tasksLeft = this.totalTasks - this.taskCounter
var millisecondsLeft = averageTimePerTask * tasksLeft
return this.formatMilliseconds(millisecondsLeft)
}
/**
* inspired from https://stackoverflow.com/questions/19700283/how-to-convert-time-milliseconds-to-hours-min-sec-format-in-javascript
* @param millisec
* @returns {string}
*/
formatMilliseconds (millisec) {
var seconds = (millisec / 1000).toFixed(1)
var minutes = (millisec / (1000 * 60)).toFixed(1)
var hours = (millisec / (1000 * 60 * 60)).toFixed(1)
var days = (millisec / (1000 * 60 * 60 * 24)).toFixed(1)
if (seconds < 60) {
return seconds + ' seconds'
} else if (minutes < 60) {
return minutes + ' minutes'
} else if (hours < 24) {
return hours + ' hours'
} else {
return days + ' days'
}
}
}
module.exports = ProgressStats
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