package vfs_test

import (
	"archive/zip"
	"bytes"
	"context"
	"io"
	"io/fs"
	"testing"

	"git.kmsign.ru/royalcat/tstor/src/vfs"
	"github.com/stretchr/testify/require"
)

// TODO
// func TestArchiveFactories(t *testing.T) {
// 	t.Parallel()

// 	ctx := context.Background()

// 	require := require.New(t)

// 	require.Contains(vfs.ArchiveFactories, ".zip")
// 	require.Contains(vfs.ArchiveFactories, ".rar")
// 	require.Contains(vfs.ArchiveFactories, ".7z")

// 	fs, err := vfs.ArchiveFactories[".zip"](ctx, &vfs.DummyFile{})
// 	require.NoError(err)
// 	require.NotNil(fs)

// 	fs, err = vfs.ArchiveFactories[".rar"](ctx, &vfs.DummyFile{})
// 	require.NoError(err)
// 	require.NotNil(fs)

// 	fs, err = vfs.ArchiveFactories[".7z"](ctx, &vfs.DummyFile{})
// 	require.NoError(err)
// 	require.NotNil(fs)
// }

var fileContent []byte = []byte("Hello World")

func TestZipFilesystem(t *testing.T) {
	t.Parallel()
	require := require.New(t)

	zReader, size := createTestZip(require)

	ctx := context.Background()

	// TODO add single dir collapse test
	zfs, err := vfs.NewArchive(ctx, "test", "test", zReader, size, vfs.ZipLoader)
	require.NoError(err)

	files, err := zfs.ReadDir(ctx, "/path/to/test/file")
	require.NoError(err)

	require.Len(files, 1)
	e := files[0]
	require.Equal("1.txt", e.Name())
	require.NotNil(e)

	out := make([]byte, 5)
	f, err := zfs.Open(ctx, "/path/to/test/file/1.txt")
	require.NoError(err)
	n, err := f.Read(ctx, out)
	require.ErrorIs(err, io.EOF)
	require.Equal(5, n)
	require.Equal([]byte("Hello"), out)

	outSpace := make([]byte, 1)
	n, err = f.Read(ctx, outSpace)
	require.ErrorIs(err, io.EOF)
	require.Equal(1, n)
	require.Equal([]byte(" "), outSpace)

	n, err = f.Read(ctx, out)
	require.ErrorIs(err, io.EOF)
	require.Equal(5, n)
	require.Equal([]byte("World"), out)

}

func createTestZip(require *require.Assertions) (vfs.File, int64) {
	buf := bytes.NewBuffer([]byte{})

	zWriter := zip.NewWriter(buf)

	f1, err := zWriter.Create("path/to/test/file/1.txt")
	require.NoError(err)
	_, err = f1.Write(fileContent)
	require.NoError(err)

	err = zWriter.Close()
	require.NoError(err)

	return newCBR(buf.Bytes()), int64(buf.Len())
}

func newCBR(b []byte) *closeableByteReader {
	return &closeableByteReader{
		data: bytes.NewReader(b),
	}
}

var _ vfs.File = &closeableByteReader{}

type closeableByteReader struct {
	data *bytes.Reader
}

// ReadAt implements ctxio.ReaderAt.
func (c *closeableByteReader) ReadAt(ctx context.Context, p []byte, off int64) (n int, err error) {
	return c.data.ReadAt(p, off)
}

// Close implements vfs.File.
func (c *closeableByteReader) Close(ctx context.Context) error {
	panic("unimplemented")
}

// Info implements vfs.File.
func (c *closeableByteReader) Info() (fs.FileInfo, error) {
	panic("unimplemented")
}

// IsDir implements vfs.File.
func (c *closeableByteReader) IsDir() bool {
	panic("unimplemented")
}

// Name implements vfs.File.
func (c *closeableByteReader) Name() string {
	panic("unimplemented")
}

// Read implements vfs.File.
func (c *closeableByteReader) Read(ctx context.Context, p []byte) (n int, err error) {
	return c.data.Read(p)
}

// Seek implements vfs.File.
func (c *closeableByteReader) Seek(offset int64, whence int) (int64, error) {
	return c.data.Seek(offset, whence)
}

// Size implements vfs.File.
func (c *closeableByteReader) Size() int64 {
	return c.data.Size()
}

// Type implements vfs.File.
func (c *closeableByteReader) Type() fs.FileMode {
	panic("unimplemented")
}