package main

import (
	"errors"
	"github.com/hajimehoshi/ebiten/v2"
    "github.com/hajimehoshi/ebiten/v2/ebitenutil"
	"log"
)

var errRegularTermination = errors.New("regular termination")

type Game struct {
	exit bool
}

func (g *Game) Layout(width, height int) (int, int) {
	return width, height
}

func (g *Game) Update() error {
	if ok, exitGame := g.verifyExit(); ok {
		return exitGame
	}

	return nil
}

func (g *Game) Draw(screen *ebiten.Image) {
	g.checkExitstatus(screen)
}

func (g *Game) verifyExit() (bool, error) {
	if ebiten.IsKeyPressed(ebiten.KeyEscape) || ebiten.IsWindowBeingClosed() {
		g.exit = true
	}

	if g.exit {
		if ebiten.IsKeyPressed(ebiten.KeyY) {
			return true, errRegularTermination
		}

		if ebiten.IsKeyPressed(ebiten.KeyN) {
			g.exit = false
		}
	}

	return false, nil
}

func (g *Game) checkExitstatus(screen *ebiten.Image) {
	if g.exit {
		ebitenutil.DebugPrint(screen, "Do you really want to close this window? [y/n]")

		return
	}
}


func main() {
	ebiten.SetWindowClosingHandled(true)
	// nolint: exhaustivestruct
	if err := ebiten.RunGame(&Game{}); err != nil && !errors.Is(err, errRegularTermination) {
		log.Fatal(err)
	}
}