/*
Copyright IBM Corp. 2016 All Rights Reserved.

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 utils

import (
	"encoding/base64"
	"io"
	"os"
	"path/filepath"
)

// DirMissingOrEmpty checks is a directory is missin or empty
func DirMissingOrEmpty(path string) (bool, error) {
	dirExists, err := DirExists(path)
	if err != nil {
		return false, err
	}
	if !dirExists {
		return true, nil
	}

	dirEmpty, err := DirEmpty(path)
	if err != nil {
		return false, err
	}
	if dirEmpty {
		return true, nil
	}
	return false, nil
}

// DirExists checks if a directory exists
func DirExists(path string) (bool, error) {
	_, err := os.Stat(path)
	if err == nil {
		return true, nil
	}
	if os.IsNotExist(err) {
		return false, nil
	}
	return false, err
}

// DirEmpty checks if a directory is empty
func DirEmpty(path string) (bool, error) {
	f, err := os.Open(path)
	if err != nil {
		return false, err
	}
	defer f.Close()

	_, err = f.Readdir(1)
	if err == io.EOF {
		return true, nil
	}
	return false, err
}

// FileMissing checks if a file is missing
func FileMissing(path string, name string) (bool, error) {
	_, err := os.Stat(filepath.Join(path, name))
	if err != nil {
		return true, err
	}
	return false, nil
}

// FilePathMissing returns true if the path is missing, false otherwise.
func FilePathMissing(path string) (bool, error) {
	_, err := os.Stat(path)
	if err != nil {
		return true, err
	}
	return false, nil
}

// DecodeBase64 decodes from Base64
func DecodeBase64(in string) ([]byte, error) {
	return base64.StdEncoding.DecodeString(in)
}

// EncodeBase64 encodes to Base64
func EncodeBase64(in []byte) string {
	return base64.StdEncoding.EncodeToString(in)
}

// IntArrayEquals checks if the arrays of ints are the same
func IntArrayEquals(a []int, b []int) bool {
	if len(a) != len(b) {
		return false
	}
	for i, v := range a {
		if v != b[i] {
			return false
		}
	}
	return true
}