// Copyright 2017 AMIS Technologies
// 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 genesis

import (
	"fmt"
	"log"
	"os"
	"path/filepath"

	uuid "github.com/satori/go.uuid"
)

const (
	defaultLocalDir  = "/tmp/gdata"
	clientIdentifier = "genesis"
)

func generateRandomDir() (string, error) {
	err := os.MkdirAll(filepath.Join(defaultLocalDir), 0700)
	if err != nil {
		log.Fatal(err)
	}

	instanceDir := filepath.Join(defaultLocalDir, fmt.Sprintf("%s-%s", clientIdentifier, uuid.NewV4().String()))
	if err := os.MkdirAll(instanceDir, 0700); err != nil {
		log.Println(fmt.Sprintf("Failed to create instance dir: %v", err))
		return "", err
	}

	return instanceDir, nil
}