package Archive

import (
	"archive/tar"
	"compress/gzip"
	"io"
	"os"
	"path/filepath"
	"strings"
)

func Gzip(source, target string) error {
	var (
		reader, writer *os.File
		archiver       *gzip.Writer
		filename       string
		e              error
	)

	reader, e = os.Open(source)
	if e != nil {
		return e
	}

	//filename = filepath.Base(source)
	//target = filepath.Join(target, fmt.Sprintf("%s.gz", filename))

	writer, e = os.Create(target)
	if e != nil {
		return e
	}

	defer writer.Close()

	archiver = gzip.NewWriter(writer)
	archiver.Name = filename
	defer archiver.Close()

	_, e = io.Copy(archiver, reader)
	return e
}

func Tar(source, target string) error {
	var (
		tarfile, file *os.File
		tarball       *tar.Writer
		header        *tar.Header
		e             error
	)

	tarfile, e = os.Create(target)
	if e != nil {
		return e
	}
	defer tarfile.Close()

	tarball = tar.NewWriter(tarfile)
	defer tarball.Close()

	return filepath.Walk(source,
		func(path string, info os.FileInfo, e error) error {
			if e != nil {
				return e
			}

			header, e = tar.FileInfoHeader(info, info.Name())
			if e != nil {
				return e
			}

			// TODO change "/" to work cross platform
			header.Name = strings.TrimPrefix(strings.TrimPrefix(path, source), "/")

			if header.Name == "" {
				return nil
			}

			e = tarball.WriteHeader(header)
			if e != nil {
				return e
			}

			if info.IsDir() {
				return nil
			}

			file, e = os.Open(path)
			if e != nil {
				return e
			}
			defer file.Close()

			_, e = io.Copy(tarball, file)
			return e
		})
}

func TarGzip(source, target string) error {
	var (
		tarPath string = strings.ReplaceAll(target, ".gz", "")
		e       error
	)

	e = Tar(source, tarPath)
	if e != nil {
		return e
	}

	e = Gzip(tarPath, target)
	if e != nil {
		return e
	}

	return os.Remove(tarPath)
}