package ui

import (
	"image/color"

	"github.com/hajimehoshi/ebiten/v2"
	"github.com/hajimehoshi/ebiten/v2/text"
	"github.com/hajimehoshi/ebiten/v2/vector"

	"muhq.space/muhqs-game/go/font"
)

type Button interface {
	Widget
	Clickable
}

type SimpleButton struct {
	WidgetBase
	label   string
	OnClick func(b *SimpleButton)
	Bg      color.Color
	Fg      color.Color
}

func NewSimpleButton(x, y, w, h int, label string, onClick func(b *SimpleButton)) *SimpleButton {
	sb := &SimpleButton{NewWidgetBase(x, y, w, h), label, onClick, Gray, color.White}
	sb.renderImpl = func() *ebiten.Image { return sb.render() }
	return sb
}

func (b *SimpleButton) render() *ebiten.Image {
	img := ebiten.NewImage(b.Width, b.Height)

	vector.DrawFilledRect(img, float32(0), float32(0), float32(b.Width), float32(b.Height), b.Bg, false)

	bounds := text.BoundString(font.Font24, b.label)
	x := b.Width/2 - centerTextXOffset(bounds)
	y := b.Height/2 - centerTextYOffset(bounds)
	text.Draw(img, b.label, font.Font24, x, y, b.Fg)
	return img
}

func (b *SimpleButton) Click(x, y int) {
	b.OnClick(b)
}

func (b *SimpleButton) UpdateLabel(label string) {
	if b.label != label {
		b.label = label
		b.ForceRedraw()
	}
}