package osutil

import (
	"fmt"
	"os"
	"strings"
	"time"
)

const tmpl = "%v - %v: "

type LoggerService struct {
	DateFormat string
	Utc bool

	file *os.File
	log bool
}

func NewLogger() *LoggerService {
	l := LoggerService{}
	l.DateFormat = time.RFC3339Nano
	l.Utc = true

	return &l
}

func (l *LoggerService) Start() {
	l.log = true
}

func (l *LoggerService) Stop() {
	l.log = false
}

func (l *LoggerService) Info(format string, params ...interface{}) {
	format = tmpl + format
	params = append([]interface{}{l.formattedTime(), "I"}, params...)

	fmt.Fprintf(os.Stdout, formatNewLine(format), params...)
}

func (l *LoggerService) formattedTime() string {
	t := time.Now()

	if l.Utc {
		t = t.UTC()
	}

	return t.Format(l.DateFormat)
}

func formatNewLine(format string) string {
	s := strings.Replace(format, "\n", " ", -1)
	s = strings.TrimSpace(s)
	return s + "\n"
}