// Copyright (C) 2018 LEAP
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package config

import (
	"io"
	"log"
	"os"
	"path"
)

// ConfigureLogger to write logs into a file as well as the stderr
func ConfigureLogger(logPath string) (io.Closer, error) {
	dir := path.Dir(logPath)
	if _, err := os.Stat(dir); err != nil {
		if os.IsNotExist(err) {
			err := os.MkdirAll(dir, 0700)
			if err != nil {
				log.Println("ERROR: cannot create data dir:", dir)
			}
		}
	}
	logFile, err := os.OpenFile(logPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
	if err == nil {
		log.SetOutput(io.MultiWriter(logFile, os.Stderr))
	}
	return logFile, err
}
