package helpers

import (
	"crypto/md5"
	"fmt"
	"io"
	"log"
	"os"
)

func CopyFile(src, dst string) (int64, error) {
	sourceFileStat, err := os.Stat(src)
	if err != nil {
		return 0, err
	}

	if !sourceFileStat.Mode().IsRegular() {
		return 0, fmt.Errorf("%s is not a regular file", src)
	}

	source, err := os.Open(src)
	if err != nil {
		return 0, err
	}
	defer source.Close()

	// Check if destination exists
	if _, err := os.Stat(dst); !os.IsNotExist(err) {
		log.Printf("- %s already exists, skipping...", dst)
		return 0, nil
	}

	destination, err := os.Create(dst)
	if err != nil {
		return 0, err
	}
	defer destination.Close()
	nBytes, err := io.Copy(destination, source)
	return nBytes, err
}

func Md5File(src string) ([]byte, error) {
	f, err := os.Open(src)
	if err != nil {
		return nil, err
	}
	defer f.Close()

	h := md5.New()
	if _, err := io.Copy(h, f); err != nil {
		return nil, err
	}

	return h.Sum(nil), nil
}