// Copyright ©2015 The Go Authors
// Copyright ©2015 Steve Francia <spf@spf13.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package afero

import (
	"os"
	"path/filepath"
	"sort"
)

// readDirNames reads the directory named by dirname and returns
// a sorted list of directory entries.
// adapted from https://golang.org/src/path/filepath/path.go
func readDirNames(dirname string, fs Fs) ([]string, error) {
	f, err := fs.Open(dirname)
	if err != nil {
		return nil, err
	}
	names, err := f.Readdirnames(-1)
	f.Close()
	if err != nil {
		return nil, err
	}
	sort.Strings(names)
	return names, nil
}

// walk recursively descends path, calling walkFn
// adapted from https://golang.org/src/path/filepath/path.go
func walk(path string, info os.FileInfo, walkFn filepath.WalkFunc, fs Fs) error {
	err := walkFn(path, info, nil)
	if err != nil {
		if info.IsDir() && err == filepath.SkipDir {
			return nil
		}
		return err
	}

	if !info.IsDir() {
		return nil
	}

	names, err := readDirNames(path, fs)
	if err != nil {
		return walkFn(path, info, err)
	}

	for _, name := range names {
		filename := filepath.Join(path, name)
		fileInfo, err := lstatIfOs(filename, fs)
		if err != nil {
			if err := walkFn(filename, fileInfo, err); err != nil && err != filepath.SkipDir {
				return err
			}
		} else {
			err = walk(filename, fileInfo, walkFn, fs)
			if err != nil {
				if !fileInfo.IsDir() || err != filepath.SkipDir {
					return err
				}
			}
		}
	}
	return nil
}

// if the filesystem is OsFs use Lstat, else use fs.Stat
func lstatIfOs(path string, fs Fs) (info os.FileInfo, err error) {
	_, ok := fs.(*OsFs)
	if ok {
		info, err = os.Lstat(path)
	} else {
		info, err = fs.Stat(path)
	}
	return
}

// Walk walks the file tree rooted at root, calling walkFn for each file or
// directory in the tree, including root. All errors that arise visiting files
// and directories are filtered by walkFn. The files are walked in lexical
// order, which makes the output deterministic but means that for very
// large directories Walk can be inefficient.
// Walk does not follow symbolic links.

func (a Afero) Walk(root string, walkFn filepath.WalkFunc) error {
	return Walk(root, walkFn, a.fs)
}

func Walk(root string, walkFn filepath.WalkFunc, fs Fs) error {
	info, err := lstatIfOs(root, fs)
	if err != nil {
		return walkFn(root, nil, err)
	}
	return walk(root, info, walkFn, fs)
}