package main

import (
	"fmt"
	"math/rand"
	"sync"
	"time"

	"github.com/vbauerster/mpb"
	"github.com/vbauerster/mpb/decor"
)

func init() {
	rand.Seed(time.Now().UnixNano())
}

func main() {
	var wg sync.WaitGroup
	p := mpb.New(mpb.WithWaitGroup(&wg))
	total := 100
	numBars := 3
	wg.Add(numBars)

	for i := 0; i < numBars; i++ {
		name := fmt.Sprintf("Bar#%d:", i)
		bar := p.AddBar(int64(total),
			mpb.PrependDecorators(
				decor.StaticName(name, 0, 0),
				// DSyncSpace is shortcut for DwidthSync|DextraSpace
				// means sync the width of respective decorator's column
				// and prepend one extra space.
				decor.Percentage(3, decor.DSyncSpace),
			),
			mpb.AppendDecorators(
				decor.ETA(3, 0),
			),
		)
		go func() {
			defer wg.Done()
			max := 200 * time.Millisecond
			for i := 0; i < total; i++ {
				time.Sleep(time.Duration(rand.Intn(10)+1) * max / 10)
				bar.Increment()
			}
		}()
	}
	// Gracefully shutdown mpb's monitor goroutine
	p.Stop()
}
