/*
 * Copyright (c) 2014, Yawning Angel <yawning at torproject dot org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package main

import (
	"fmt"
	"log"
	"strings"
)

const (
	levelError = iota
	levelWarn
	levelInfo
)

var logLevel = levelInfo

func noticef(format string, a ...interface{}) {
	if enableLogging {
		msg := fmt.Sprintf(format, a...)
		log.Print("[NOTICE]: " + msg)
	}
}

func errorf(format string, a ...interface{}) {
	if enableLogging && logLevel >= levelError {
		msg := fmt.Sprintf(format, a...)
		log.Print("[ERROR]: " + msg)
	}
}

func warnf(format string, a ...interface{}) {
	if enableLogging && logLevel >= levelWarn {
		msg := fmt.Sprintf(format, a...)
		log.Print("[WARN]: " + msg)
	}
}

func infof(format string, a ...interface{}) {
	if enableLogging && logLevel >= levelInfo {
		msg := fmt.Sprintf(format, a...)
		log.Print("[INFO]: " + msg)
	}
}

func setLogLevel(logLevelStr string) error {
	switch strings.ToUpper(logLevelStr) {
	case "ERROR":
		logLevel = levelError

	case "WARN":
		logLevel = levelWarn

	case "INFO":
		logLevel = levelInfo

	default:
		return fmt.Errorf("invalid log level '%s'", logLevelStr)
	}

	return nil
}