package main

import (
	"bytes"

	"github.com/ebitenui/ebitenui"
	"github.com/ebitenui/ebitenui/image"
	"github.com/ebitenui/ebitenui/widget"
	"github.com/hajimehoshi/ebiten/v2"
	"github.com/hajimehoshi/ebiten/v2/text/v2"
	"golang.org/x/image/colornames"
	"golang.org/x/image/font/gofont/goregular"
)

type Editor struct {
	ui *ebitenui.UI
}

func NewEditor() *Editor {
	root := widget.NewContainer(
		widget.ContainerOpts.BackgroundImage(
			image.NewNineSliceColor(colornames.Gainsboro),
		))
	root.AddChild(
		widget.NewButton(
			widget.ButtonOpts.TextLabel("Open Sprite Sheet..."),
			widget.ButtonOpts.TextFace(DefaultFont()),
			widget.ButtonOpts.TextColor(&widget.ButtonTextColor{
				Idle:    colornames.Gainsboro,
				Hover:   colornames.Gainsboro,
				Pressed: colornames.Gainsboro,
			}),
			widget.ButtonOpts.Image(&widget.ButtonImage{
				Idle:         DefaultNineSlice(colornames.Darkslategray),
				Hover:        DefaultNineSlice(Mix(colornames.Darkslategray, colornames.Mediumseagreen, 0.4)),
				Disabled:     DefaultNineSlice(Mix(colornames.Darkslategray, colornames.Gainsboro, 0.8)),
				Pressed:      PressedNineSlice(Mix(colornames.Darkslategray, colornames.Black, 0.4)),
				PressedHover: PressedNineSlice(Mix(colornames.Darkslategray, colornames.Black, 0.4)),
			}),
			widget.ButtonOpts.WidgetOpts(
				widget.WidgetOpts.LayoutData(widget.AnchorLayoutData{
					VerticalPosition:   widget.AnchorLayoutPositionCenter,
					HorizontalPosition: widget.AnchorLayoutPositionCenter,
				}),
				widget.WidgetOpts.MinSize(180, 48),
			),
		),
	)

	return &Editor{
		ui: &ebitenui.UI{Container: root},
	}
}

func (e *Editor) Update() error {
	e.ui.Update()
	return nil
}

func (e *Editor) Draw(screen *ebiten.Image) {
	e.ui.Draw(screen)
}

func (e *Editor) Layout(w, h int) (int, int) {
	return w, h
}

func DefaultFont() *text.Face {
	s, err := text.NewGoTextFaceSource(bytes.NewReader(goregular.TTF))
	if err != nil {
		panic(err)
	}

	var f text.Face

	f = &text.GoTextFace{
		Source: s,
		Size:   20,
	}

	return &f
}

func main() {
	ebiten.SetWindowSize(480, 320)
	ebiten.SetWindowResizingMode(ebiten.WindowResizingModeEnabled)
	if err := ebiten.RunGame(NewEditor()); err != nil {
		panic(err)
	}
}