package util

import (
	"errors"
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"path"
)

func FSCheckIfDirPathExists(path string) error {
	stat, err := os.Lstat(path)
	if err != nil {
		return err
	}
	if !stat.IsDir() {
		err = errors.New("no such directory")
	}
	return err
}

func FSCopyFile(src, dst string) error {
	var err error
	var srcfd *os.File
	var dstfd *os.File
	var srcinfo os.FileInfo

	if srcfd, err = os.Open(src); err != nil {
		return err
	}
	defer srcfd.Close()

	if dstfd, err = os.Create(dst); err != nil {
		return err
	}
	defer dstfd.Close()

	if _, err = io.Copy(dstfd, srcfd); err != nil {
		return err
	}
	if srcinfo, err = os.Stat(src); err != nil {
		return err
	}
	return os.Chmod(dst, srcinfo.Mode())
}

func FSCopyDir(src string, dst string) error {
	var err error
	var fds []os.FileInfo
	var srcinfo os.FileInfo

	if srcinfo, err = os.Stat(src); err != nil {
		return err
	}

	if err = os.MkdirAll(dst, srcinfo.Mode()); err != nil {
		return err
	}

	if fds, err = ioutil.ReadDir(src); err != nil {
		return err
	}
	for _, fd := range fds {
		srcfp := path.Join(src, fd.Name())
		dstfp := path.Join(dst, fd.Name())

		if fd.IsDir() {
			if err = FSCopyDir(srcfp, dstfp); err != nil {
				fmt.Println(err)
			}
		} else {
			if err = FSCopyFile(srcfp, dstfp); err != nil {
				fmt.Println(err)
			}
		}
	}
	return nil
}