// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package common

import (
	"fmt"
	"os"
	"path/filepath"
	"runtime"
)

// MakeName creates a node name that follows the ethereum convention
// for such names. It adds the operation system name and Go runtime version
// the name.
func MakeName(name, version string) string {
	return fmt.Sprintf("%s/%s/%s-%s/%s", name, version, runtime.GOOS, runtime.GOARCH, runtime.Version())
}

// FileExist checks if a file exists at filePath.
func FileExist(filePath string) bool {
	_, err := os.Stat(filePath)
	if err != nil && os.IsNotExist(err) {
		return false
	}

	return true
}

// AbsolutePath returns datadir + filename, or filename if it is absolute.
func AbsolutePath(datadir, filename string) string {
	if filepath.IsAbs(filename) {
		return filename
	}
	return filepath.Join(datadir, filename)
}