package logger

import (
	"fmt"

	"github.com/mgutz/ansi"
)

type Logger interface {
	Trace(f string, args ...interface{})
	Debug(f string, args ...interface{})
	Info(f string, args ...interface{})
	Warn(f string, args ...interface{})
}

type NullLogger struct{}

func (n NullLogger) Trace(f string, args ...interface{}) {}

func (n NullLogger) Debug(f string, args ...interface{}) {}

func (n NullLogger) Info(f string, args ...interface{}) {}

func (n NullLogger) Warn(f string, args ...interface{}) {}

type ColorLogger struct {
	VeryVerbose bool
	Verbose     bool
	Prefix      string
	Color       bool
}

func (c ColorLogger) Trace(f string, args ...interface{}) {
	if !c.VeryVerbose {
		return
	}
	c.output("blue", f, args...)
}

func (c ColorLogger) Debug(f string, args ...interface{}) {
	if !c.Verbose {
		return
	}
	c.output("green", f, args...)
}

func (c ColorLogger) Info(f string, args ...interface{}) {
	c.output("green", f, args...)
}

func (c ColorLogger) Warn(f string, args ...interface{}) {
	c.output("red", f, args...)
}

func (c ColorLogger) output(color, f string, args ...interface{}) {
	if c.Color && color != "" {
		f = ansi.Color(f, color)
	}
	fmt.Printf(fmt.Sprintf("%s%s\n", c.Prefix, f), args...)
}