package util

import (
	"bufio"
	"errors"
	"os"

	"github.com/chrislusf/seaweedfs/weed/glog"
)

func TestFolderWritable(folder string) (err error) {
	fileInfo, err := os.Stat(folder)
	if err != nil {
		return err
	}
	if !fileInfo.IsDir() {
		return errors.New("Not a valid folder!")
	}
	perm := fileInfo.Mode().Perm()
	glog.V(0).Infoln("Folder", folder, "Permission:", perm)
	if 0200&perm != 0 {
		return nil
	}
	return errors.New("Not writable!")
}

func Readln(r *bufio.Reader) ([]byte, error) {
	var (
		isPrefix = true
		err      error
		line, ln []byte
	)
	for isPrefix && err == nil {
		line, isPrefix, err = r.ReadLine()
		ln = append(ln, line...)
	}
	return ln, err
}

func GetFileSize(file *os.File) (size int64, err error) {
	var fi os.FileInfo
	if fi, err = file.Stat(); err == nil {
		size = fi.Size()
	}
	return
}