package buttons

import (
	"image/color"

	"git.vezzani.net/ben/games/common/elements/v1"
	"git.vezzani.net/ben/games/common/elements/v1/blocks"
	"git.vezzani.net/ben/games/common/elements/v1/mouse"
	"git.vezzani.net/ben/games/common/ux/v1"

	"github.com/hajimehoshi/ebiten/v2"
	"github.com/hajimehoshi/ebiten/v2/text"
	"golang.org/x/image/font"
)

func New(ops ...OptFunc) elements.InitFunc {
	return func() elements.Element {
		b := Button{
			Block: blocks.Block{},
			font:  ux.FontFace,
			color: ux.FontColor,
		}
		for op := range ops {
			ops[op](&b)
		}

		return &b
	}
}

type Button struct {
	blocks.Block

	label string
	font  font.Face
	color color.Color

	onClick     func(ms mouse.State)
	onMouseDown func(ms mouse.State)
	onMouseUp   func(ms mouse.State)
}

func (b *Button) Draw(screen *ebiten.Image) {
	b.Block.Draw(screen)
	b.drawLabel(screen)
}

func (b *Button) drawLabel(screen *ebiten.Image) {
	if b.label != "" {
		strBounds, _ := font.BoundString(b.font, b.label)

		textWidth := strBounds.Max.X - strBounds.Min.X
		textHeight := strBounds.Max.Y - strBounds.Min.Y

		bnd := b.Bounds()
		tx := bnd.Min.X + (bnd.Width / 2) - (textWidth / 2).Round()
		ty := bnd.Min.Y + (bnd.Height / 2) - (textHeight / 2).Round()

		text.Draw(screen, b.label, b.font, tx, ty, b.color)

	}
}

func (b *Button) HandleMouseEvent(ms mouse.State) bool {
	bnd := b.Bounds()

	if !bnd.Contains(ms.Point()) {
		return false
	}
	
	switch {
	case b.onClick != nil && (ms.RightClicked || ms.LeftClicked):
		b.onClick(ms)
		return true
	case b.onMouseUp != nil && (ms.RightChanged && !ms.RightDown || ms.LeftChanged && !ms.LeftDown):
		b.onMouseUp(ms)
		return true
	case b.onMouseDown != nil && (ms.RightChanged && ms.RightDown || ms.LeftChanged && ms.LeftDown):
		b.onMouseDown(ms)
		return true
	}

	return false
}