package steam

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

func TarWalkfn(writer *tar.Writer) filepath.WalkFunc {
	return func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		if info.IsDir() {
			return nil
		}

		f, err := os.Open(path)
		if err != nil {
			return err
		}
		defer f.Close()

		// Convert Windows paths to Unix paths
		path = strings.Replace(path, "\\", "/", -1)

		// TODO; See if tar.FileInfoheader() could be used instead
		// without the pathing issues I encountered
		h := &tar.Header{
			Name: path,
			Size: info.Size(),
			// I don't like it... but it helps with platform compatibility
			Mode:    0664,
			ModTime: info.ModTime(),
		}

		err = writer.WriteHeader(h)
		if err != nil {
			return err
		}

		_, err = io.Copy(writer, f)
		if err != nil {
			// TODO: Figure out how to add more useful information to
			// These errors
			// fmt.Fprintln(os.Stderr, f.Name())
			return err
		}

		return nil
	}
}