// Package util provide some utility functions
package util

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

// CopyFile define func of copies a file from src to dst.
// If the destination file exists, it will be overwritten.
func CopyFile(src, dst string) error {
	sourceFile, err := os.Open(src)
	if err != nil {
		return fmt.Errorf("failed to open source file %s: %w", src, err)
	}
	defer sourceFile.Close()

	destFile, err := os.Create(dst)
	if err != nil {
		return fmt.Errorf("failed to create destination file %s: %w", dst, err)
	}
	defer destFile.Close()

	_, err = io.Copy(destFile, sourceFile)
	if err != nil {
		return fmt.Errorf("failed to copy file contents from %s to %s: %w", src, dst, err)
	}

	err = destFile.Sync()
	if err != nil {
		return fmt.Errorf("failed to sync destination file %s: %w", dst, err)
	}
	return nil
}