package internal

import (
	"fmt"
	"math/rand"
	"os"
	"strings"
	"testing"
	"time"
)

const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

// GetEnvOrSkipTest proceeds with test only with that env variable
func GetEnvOrSkipTest(t *testing.T, name string) string {
	value := os.Getenv(name)
	if value == "" {
		t.Skipf("Environment variable %s is missing", name)
	}
	return value
}

// RandomName gives random name with optional prefix. e.g. qa.RandomName("tf-")
func RandomName(prefix ...string) string {
	rand.Seed(time.Now().UnixNano())
	randLen := 12
	b := make([]byte, randLen)
	for i := range b {
		b[i] = charset[rand.Intn(randLen)]
	}
	if len(prefix) > 0 {
		return fmt.Sprintf("%s%s", strings.Join(prefix, ""), b)
	}
	return string(b)
}