package main

import (
	"io"
	"os"
	"testing"
)

func mkDirForTest(t *testing.T, fp string) {
	err := os.MkdirAll(fp, os.ModePerm)
	if err != nil {
		t.Fatal(err)
	}
}

func cpFileForTest(t *testing.T, src string, dst string) {
	var srcfd *os.File
	var dstfd *os.File
	var err error
	var srcinfo os.FileInfo
	srcfd, err = os.Open(src)
	if err != nil {
		t.Fatal(err)
	}
	defer srcfd.Close()
	dstfd, err = os.Create(dst)
	if err != nil {
		t.Fatal(err)
	}

	defer dstfd.Close()
	_, err = io.Copy(dstfd, srcfd)
	if err != nil {
		t.Fatal(err)
	}
	srcinfo, err = os.Stat(src)
	if err != nil {
		t.Fatal(err)
	}
	err = os.Chmod(dst, srcinfo.Mode())
	if err != nil {
		t.Fatal(err)
	}
}

func writeForTest(t *testing.T, fp string, data []byte) {
	err := os.WriteFile(fp, data, 0666)
	if err != nil {
		t.Fatal(err)
	}
}

func IsDirEmpty(t *testing.T, name string) bool {
	f, err := os.Open(name)
	if err != nil {
		t.Fatal(err)
	}
	defer f.Close()

	// read in ONLY one file
	_, err = f.Readdir(1)

	// and if the file is EOF... well, the dir is empty.
	return err == io.EOF
}