package logb

import (
	"fmt"
	"io"
	"os"
)

var level Level = INFO
var writer io.Writer = os.Stderr

func Reset() {
	Set()
}

func Writer() io.Writer {
	return writer
}

func Set(l ...Level) {
	if len(l) < 1 {
		l = []Level{INFO}
	}
	level.Set(l[0])
	Info("level set to", l[0])
}

func SetWriter(w io.Writer) {
	writer = w
}

func Info(args ...interface{}) {
	log(INFO, args...)
}

func Warn(args ...interface{}) {
	log(WARN, args...)
}

func Error(args ...interface{}) {
	log(ERROR, args...)
}

func Debug(args ...interface{}) {
	log(DEBUG, args...)
}

func Verbose(args ...interface{}) {
	log(VERBOSE, args...)
}

func Infof(form string, args ...interface{}) {
	logf(INFO, form, args...)
}

func Warnf(form string, args ...interface{}) {
	logf(WARN, form, args...)
}

func Errorf(form string, args ...interface{}) {
	logf(ERROR, form, args...)
}

func Debugf(form string, args ...interface{}) {
	logf(DEBUG, form, args...)
}

func Verbosef(form string, args ...interface{}) {
	logf(VERBOSE, form, args...)
}

func log(lvl Level, args ...interface{}) {
	v := ""
	if len(args) > 0 {
		args = append([]interface{}{}, args...)
		v = fmt.Sprint(args)
		if len(args) > 1 {
			v = v[1 : len(v)-1]
		}
	}
	logf(lvl, "%s", v)
}

func logf(lvl Level, form string, args ...interface{}) {
	if !level.Should(lvl) {
		return
	}
	form = fmt.Sprintf("[%v] %s\n", lvl.String()[:3], form)
	if writer != os.Stderr {
		fmt.Fprintf(writer, form, args...)
	} else {
		fmt.Fprintf(os.Stderr, form, args...)
	}
}