package util

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

func CopyFile(src, dst string) error {
	source, err := os.Open(src)
	if err != nil {
		return err
	}
	defer source.Close()

	destDir := filepath.Dir(dst)
	if err := os.MkdirAll(destDir, os.ModePerm); err != nil {
		return err
	}

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

	_, err = io.Copy(destination, source)
	return err
}

func CreateHardLink(target, linkName string) error {
	// 文件夹不存在则创建
	destDir := filepath.Dir(linkName)
	if err := os.MkdirAll(destDir, os.ModePerm); err != nil {
		return err
	}

	return os.Link(target, linkName)
}

func FileExists(filename string) bool {
	_, err := os.Stat(filename)
	return !os.IsNotExist(err)
}

func RemoveEmptyDir(path string) error {
	entries, err := os.ReadDir(path)
	if err != nil {
		return err
	}

	if len(entries) == 0 {
		return os.Remove(path)
	}

	return nil
}