package ui

import (
	"image"

	"github.com/hajimehoshi/ebiten"
	"github.com/hajimehoshi/ebiten/ebitenutil"

	"code.ur.gs/lupine/ordoor/internal/menus"
)

func init() {
	registerBuilder(menus.TypeStatic, registerStatic)
	registerBuilder(menus.TypeHypertext, registerHypertext)
	registerBuilder(menus.TypeOverlay, registerOverlay)
	registerBuilder(menus.TypeAnimationSample, registerAnimation)
}

// A non-interactive element is not a widget; it merely displays some pixels and
// may optionally have a tooltip for display within bounds.
//
// For non-animated non-interactive elements, just give them a single frame.
type noninteractive struct {
	frames animation
	rect   image.Rectangle

	// Some non-interactives, e.g., overlays, are an image + text to be shown
	textImg *ebiten.Image

	hoverImpl
}

func registerStatic(d *Driver, r *menus.Record) error {
	// FIXME: SpriteID takes precedence over SHARE if present, but is that right?
	spriteId := r.Share
	if len(r.SpriteId) > 0 && r.SpriteId[0] != -1 {
		spriteId = r.SpriteId[0]
	}

	sprite, err := d.menu.Sprite(spriteId)
	if err != nil {
		return err
	}

	ni := &noninteractive{
		frames:    animation{sprite.Image},
		hoverImpl: hoverImpl{text: r.Text},
		rect:      sprite.Rect,
	}

	d.hoverables = append(d.hoverables, ni)
	d.paintables = append(d.paintables, ni)

	return nil
}

func registerHypertext(d *Driver, r *menus.Record) error {
	sprite, err := d.menu.Sprite(r.Share)
	if err != nil {
		return err
	}

	ni := &noninteractive{
		hoverImpl: hoverImpl{text: r.Text},
		rect:      sprite.Rect,
	}

	d.hoverables = append(d.hoverables, ni)

	return nil
}

// An overlay is a static image + some text that needs to be rendered
func registerOverlay(d *Driver, r *menus.Record) error {
	sprite, err := d.menu.Sprite(r.Share)
	if err != nil {
		return err
	}

	ni := &noninteractive{
		frames: animation{sprite.Image},
		rect:   sprite.Rect,
	}

	if r.Text != "" {
		// FIXME: we should be rendering the text much more nicely than this
		textImg, err := ebiten.NewImage(sprite.Rect.Dx(), sprite.Rect.Dy(), ebiten.FilterDefault)
		if err != nil {
			return err
		}

		ebitenutil.DebugPrint(textImg, r.Text)
		ni.textImg = textImg
	}

	d.paintables = append(d.paintables, ni)

	return nil
}

// An animation is a non-interactive element that displays something in a loop
func registerAnimation(d *Driver, r *menus.Record) error {
	sprite, err := d.menu.Sprite(r.SpriteId[0])
	if err != nil {
		return err
	}

	frames, err := d.menu.Images(r.SpriteId[0], r.DrawType)
	if err != nil {
		return err
	}

	ani := &noninteractive{
		frames:    animation(frames),
		hoverImpl: hoverImpl{text: r.Text},
		rect:      sprite.Rect,
	}

	d.hoverables = append(d.hoverables, ani)
	d.paintables = append(d.paintables, ani)

	return nil
}

func (n *noninteractive) bounds() image.Rectangle {
	return n.rect
}

func (n *noninteractive) regions(tick int) []region {
	out := oneRegion(n.bounds().Min, n.frames.image(tick))

	if n.textImg != nil {
		out = append(out, oneRegion(n.bounds().Min, n.textImg)...)
	}

	return out
}