// Copyright 2016 CoreOS, Inc.
//
// 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 parse

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

// walkDirExt returns all FileInfos with specific extension.
// Make sure to prefix the extension name with dot.
// For example, to find all go files, pass ".go".
func walkDirExt(targetDir, ext string) (map[os.FileInfo]string, error) {
	rmap := make(map[os.FileInfo]string)
	visit := func(path string, f os.FileInfo, err error) error {
		if f != nil {
			if !f.IsDir() {
				if filepath.Ext(path) == ext {
					if !filepath.HasPrefix(path, ".") && !strings.Contains(path, "/.") {
						if _, ok := rmap[f]; !ok {
							wd, err := os.Getwd()
							if err != nil {
								return err
							}
							thepath := filepath.Join(wd, strings.Replace(path, wd, "", -1))
							rmap[f] = thepath
						}
					}
				}
			}
		}
		return nil
	}
	err := filepath.Walk(targetDir, visit)
	if err != nil {
		return nil, err
	}
	return rmap, nil
}

func toFile(txt, fpath string) error {
	f, err := os.OpenFile(fpath, os.O_RDWR|os.O_TRUNC, 0777)
	if err != nil {
		f, err = os.Create(fpath)
		if err != nil {
			return err
		}
	}
	defer f.Close()
	if _, err := f.WriteString(txt); err != nil {
		return err
	}
	return nil
}