package ox

import (
	"github.com/hajimehoshi/ebiten/v2"
	//"fmt"
)

import "surdeus.su/core/gg/mx"
import "surdeus.su/core/gg"

var _ = gg.Drawer(&Sprite{})
type Sprite struct {
	Transform
	Drawity
}

var (
	//spritesOp DrawImageOptions
)

func (s *Sprite) Draw(c gg.Context) *gg.Drawing {
	// Nothing to draw.
	if s.Images[0] == nil {
		return nil
	}
	
	t := s.GetRectangleToDraw().Transform
	m := t.GetMatrice()
	if !s.IsFloating() {
		m.Concat(c.Camera().GetRealMatrice(c))
	}

	// Drawing without shader.
	if s.Shader == nil {
		c.Image().DrawImage(s.Images[0], &ebiten.DrawImageOptions{
			GeoM: m,
		})
		return nil
	}
	
	w, h := s.Images[0].Size()
	// Drawing with shader.
	c.Image().DrawRectShader(
		w, h,
		s.Shader,
		&ebiten.DrawRectShaderOptions{
			Images: s.Images,
			Uniforms: s.Uniforms,
			GeoM: m,
		},
	)
	return nil
}

// Return the rectangle that contains the sprite to draw.
func (s *Sprite) GetRectangleToDraw() Rectangle {
	if s.Images[0] == nil {
		return Rectangle{}
	}
	
	w, h := s.Images[0].Size()
	t := s.Transform
	t.SetAround(
		t.GetAround().Mul(
			mx.Vector{mx.Float(w), mx.Float(h)},
		),
	)
	
	return Rectangle{
		Transform: t,
	}
}

// Return the rectangle that contains
// the sprite in the engine.
func (s *Sprite) GetRectangle() Rectangle {
	if s.Images[0] == nil {
		return Rectangle{
			Transform: s.Transform,
		}
	}
	
	w, h := s.Images[0].Size()
	t := s.Transform
	
	return Rectangle{
		Transform: t,
		Width: mx.Float(w),
		Height: mx.Float(h),
	}
}

// Get triangles of the rectangle that contains the sprite
// and has the same widght and height.
func (s *Sprite) MakeTriangles() mx.Triangles {
	return s.GetRectangle().MakeTriangles()
}

func (s *Sprite) Vertices() mx.Vectors {
	return s.GetRectangle().Vertices()
}

func (s *Sprite) Edges() mx.Lines {
	return s.GetRectangle().Edges()
}

func (s *Sprite) ContainsPoint(
	pt mx.Vector,
) bool {
	return s.GetRectangle().ContainsPoint(pt)
}

func (s *Sprite) GetContainedPoints(
	pts mx.Vectors,
) mx.Vectors {
	return s.GetRectangle().GetContainedPoints(pts)
}