package ox

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

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

type Sprite struct {
	ObjectImpl
	gg.Transform
	ShaderOptions
	Floating bool
	Visibility
}

var (
	//spritesOp DrawImageOptions
)

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

	// Drawing without shader.
	if s.Shader == nil {
		c.DrawImage(s.Images[0], &ebiten.DrawImageOptions{
			GeoM: m,
		})
		return nil
	}
	
	w, h := s.Images[0].Size()
	// Drawing with shader.
	c.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.Around().Mul(
			V(Float(w), 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: Float(w),
		Height: Float(h),
	}
}

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