package main

import (
	"encoding/json"
	"errors"
	"io"
	"io/fs"
	"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 {
		if errors.Is(err, fs.ErrNotExist) {
			return
		} else {
			t.Fatal(err)
		}

	}
	// 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
}

func doesFileExist(name string) bool {
	_, err := os.Stat(name)
	return !errors.Is(err, fs.ErrNotExist)
}

func removeFileForTest(t *testing.T, name string) {
	err := os.Remove(name)
	if err != nil {
		t.Fatal(err)
	}
}

func writeJsonForTest(t *testing.T, data map[string]string, fp string) {
	jsonString, _ := json.Marshal(data)
	err := os.WriteFile(fp, jsonString, os.ModePerm)
	if err != nil {
		t.Fatal(err)
	}
}