package mtree

import (
	"archive/tar"
	"bytes"
	"io"
	"io/ioutil"
	"os"
	"testing"
)

func ExampleStreamer() {
	fh, err := os.Open("./testdata/test.tar")
	if err != nil {
		// handle error ...
	}
	str := NewTarStreamer(fh, nil)
	if err := extractTar("/tmp/dir", str); err != nil {
		// handle error ...
	}

	dh, err := str.Hierarchy()
	if err != nil {
		// handle error ...
	}

	res, err := Check("/tmp/dir/", dh, nil)
	if err != nil {
		// handle error ...
	}
	if len(res.Failures) > 0 {
		// handle validation issue ...
	}
}
func extractTar(root string, tr io.Reader) error {
	return nil
}

func TestTar(t *testing.T) {
	/*
		data, err := makeTarStream()
		if err != nil {
			t.Fatal(err)
		}
		buf := bytes.NewBuffer(data)
		str := NewTarStreamer(buf, append(DefaultKeywords, "sha1"))
	*/
	fh, err := os.Open("./testdata/test.tar")
	if err != nil {
		t.Fatal(err)
	}
	str := NewTarStreamer(fh, append(DefaultKeywords, "sha1"))

	if _, err := io.Copy(ioutil.Discard, str); err != nil && err != io.EOF {
		t.Fatal(err)
	}
	if err := str.Close(); err != nil {
		t.Fatal(err)
	}
	defer fh.Close()

	/*
		fi, err := fh.Stat()
		if err != nil {
			t.Fatal(err)
		}
		if i != fi.Size() {
			t.Errorf("expected length %d; got %d", fi.Size(), i)
		}
	*/
	dh, err := str.Hierarchy()
	if err != nil {
		t.Fatal(err)
	}
	if dh == nil {
		t.Fatal("expected a DirectoryHierarchy struct, but got nil")
	}
	//dh.WriteTo(os.Stdout)
}

// minimal tar archive stream that mimics what is in ./testdata/test.tar
func makeTarStream() ([]byte, error) {
	buf := new(bytes.Buffer)

	// Create a new tar archive.
	tw := tar.NewWriter(buf)

	// Add some files to the archive.
	var files = []struct {
		Name, Body string
		Mode       int64
		Type       byte
		Xattrs     map[string]string
	}{
		{"x/", "", 0755, '5', nil},
		{"x/files", "howdy\n", 0644, '0', nil},
	}
	for _, file := range files {
		hdr := &tar.Header{
			Name:   file.Name,
			Mode:   file.Mode,
			Size:   int64(len(file.Body)),
			Xattrs: file.Xattrs,
		}
		if err := tw.WriteHeader(hdr); err != nil {
			return nil, err
		}
		if len(file.Body) > 0 {
			if _, err := tw.Write([]byte(file.Body)); err != nil {
				return nil, err
			}
		}
	}
	// Make sure to check the error on Close.
	if err := tw.Close(); err != nil {
		return nil, err
	}
	return buf.Bytes(), nil
}