package logging

import (
	"io"
	"os"
)

type Backend interface {
	Write(*Record) error
	SetLevel(Level)
	SetFormatter(*Formatter)
}

type StdoutBackend struct {
	l         io.Writer
	level     Level
	formatter *Formatter
}

func NewStdoutBackend() (b *StdoutBackend) {
	b = &StdoutBackend{
		l:         os.Stdout,
		formatter: &defaultFormatter,
	}
	return
}

func (b StdoutBackend) Write(r *Record) error {
	if r.Level >= b.level {
		//check back for auto dereferencing
		text := (*b.formatter)(r)
		b.l.Write([]byte(text))
	}
	return nil
}

func (b *StdoutBackend) SetLevel(l Level) {
	b.level = l
}

func (b *StdoutBackend) SetFormatter(f *Formatter) {
	b.formatter = f
}