package main

import (
	"errors"
	"fmt"
	"io"
	"os"
)

func copyFiles(src, dst string) error {
	isSrcExist, err := os.Stat(src)
	if err != nil {
		return err
	}
	if !isSrcExist.Mode().IsRegular() {
		return &os.PathError{
			Op:   "copy",
			Path: src,
			Err:  errors.New("не является обычным файлом"),
		}
	}

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

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

func getIspFileNames(dirName string) ([]string, []error) {
	var fileList []string
	var errs []error

	ispList, err := os.ReadDir(dirName)
	if err != nil {
		err = fmt.Errorf("Ошибка при получении содержимого директории %s : %s", dirName, err)
		errs = append(errs, err)
		err = nil
	}
	for _, entry := range ispList {
		dirPath := dirName + "/" + entry.Name()
		if entry.IsDir() {
			interList, interErrs := getIspFileNames(dirPath)
			for _, ie := range interErrs {
				errs = append(errs, ie)
			}
			for _, il := range interList {
				fileList = append(fileList, il)
			}
		}
		fileList = append(fileList, dirPath)
	}

	return fileList, errs
}