package testutil

import (

"strconv"

"sync/atomic"

"testing"

"github.com/moby/moby/pkg/namesgenerator"

)

var n atomic.Int64

const maxNameLen = 32

// GetRandomName returns a random name using moby/pkg/namesgenerator.

// namesgenerator.GetRandomName exposes a retry parameter that appends

// a pseudo-random number between 1 and 10 to its return value.

// While this reduces the probability of collisions, it does not negate them.

// This function calls namesgenerator.GetRandomName without the retry

// parameter and instead increments a monotonically increasing integer

// to the return value.

func GetRandomName(t testing.TB) string {

t.Helper()

name := namesgenerator.GetRandomName(0)

return incSuffix(name, n.Add(1), maxNameLen)

}

func incSuffix(s string, num int64, maxLen int) string {

suffix := strconv.FormatInt(num, 10)

if len(s)+len(suffix) <= maxLen {

return s + suffix

}

stripLen := (len(s) + len(suffix)) - maxLen

stripIdx := len(s) - stripLen

if stripIdx < 0 {

return ""

}

s = s[:stripIdx]

return s + suffix

}