// vi:ts=4:sts=4:sw=4:noet:tw=72

package xlog

import (
	"fmt"
	"log"
	"os"
	"runtime"
)

const (
	FATAL = iota
	ERROR
	WARNING
	INFO
	DEBUG
)

var levelNames = map[int]string{
	FATAL:   "[FAT] ",
	ERROR:   "[ERR] ",
	WARNING: "[WRN] ",
	INFO:    "[INF] ",
	DEBUG:   "[DBG] ",
}

var logLevel int
var logger *log.Logger

type LogWriter struct {
}

func (w *LogWriter) Write(buf []byte) (int, error) {
	fmt.Printf("%s", string(buf))
	return len(buf), nil
}

func Init(lvl int) {
	logger = log.New(&LogWriter{}, "", log.Ldate|log.Ltime)
	logLevel = lvl
}

func Log(lvl int, s string, a ...interface{}) {
	if lvl <= logLevel {
		_, file, line, ok := runtime.Caller(2)
		if !ok {
			file = "???"
		} else {
			short := file
			for i := len(file) - 1; i > 0; i-- {
				if file[i] == '/' {
					short = file[i+1:]
					break
				}
			}
			file = short
		}
		l := fmt.Sprintf("%d", line)
		logger.Printf(levelNames[lvl]+file+":"+l+": "+s, a...)
	}
}

func Debug(s string, a ...interface{}) {
	Log(DEBUG, s, a...)
}

func Info(s string, a ...interface{}) {
	Log(INFO, s, a...)
}

func Warning(s string, a ...interface{}) {
	Log(WARNING, s, a...)
}

func Error(s string, a ...interface{}) {
	Log(ERROR, s, a...)
}

func Fatal(s string, a ...interface{}) {
	Log(FATAL, s, a...)
	os.Exit(0)
}