package common

import (
	"archive/tar"
	"archive/zip"
	"errors"
	"io"
	"os"
	"path"

	"golang.org/x/text/encoding/korean"
	"golang.org/x/text/transform"
)

func Unzip(fname string) error {
	archive, err := zip.OpenReader(fname)
	if err != nil {
		os.Remove(fname)
		return err
	}
	defer archive.Close()

	verpath := path.Dir(fname)
	for _, f := range archive.File {
		var name string
		if f.NonUTF8 {
			name, _, _ = transform.String(korean.EUCKR.NewDecoder(), f.Name)
		} else {
			name = f.Name
		}

		filePath := path.Join(verpath, name)

		if f.FileInfo().IsDir() {
			os.MkdirAll(filePath, os.ModePerm)
			continue
		}

		if err := os.MkdirAll(path.Dir(filePath), os.ModePerm); err != nil {
			return err
		}

		dstFile, err := os.OpenFile(filePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
		if err != nil {
			return err
		}

		fileInArchive, err := f.Open()
		if err != nil {
			return err
		}

		if _, err := io.Copy(dstFile, fileInArchive); err != nil {
			return err
		}

		dstFile.Close()
		fileInArchive.Close()
	}
	return nil
}

func Untar(fname string) error {
	file, err := os.Open(fname)
	if err != nil {
		return err
	}
	defer file.Close()

	verpath := path.Dir(fname)
	tarReader := tar.NewReader(file)
	for {
		header, err := tarReader.Next()
		if err == io.EOF {
			break
		}
		if err != nil {
			return err
		}

		switch header.Typeflag {
		case tar.TypeDir:
			if err := os.MkdirAll(path.Join(verpath, header.Name), 0755); err != nil {
				return err
			}
		case tar.TypeReg:
			fileWriter, err := os.Create(path.Join(verpath, header.Name))
			if err != nil {
				return err
			}
			defer fileWriter.Close()

			if _, err := io.Copy(fileWriter, tarReader); err != nil {
				return err
			}
		default:
			return errors.New("unknown type")
		}
	}
	return nil
}