#include "polygon_2d.h"

Rect2 Polygon2D::get_item_rect() const {


	if (rect_cache_dirty){
		int l =polygon.size();
		DVector<Vector2>::Read r = polygon.read();
		item_rect=Rect2();
		for(int i=0;i<l;i++) {
			Vector2 pos = r[i] + offset;
			if (i==0)
				item_rect.pos=pos;
			else
				item_rect.expand_to(pos);
		}
		item_rect=item_rect.grow(20);
		rect_cache_dirty=false;
	}


	return item_rect;


}

void Polygon2D::edit_set_pivot(const Point2& p_pivot) {

	set_offset(p_pivot);
}

Point2 Polygon2D::edit_get_pivot() const {

	return get_offset();
}
bool Polygon2D::edit_has_pivot() const {

	return true;
}

void Polygon2D::_notification(int p_what) {


	switch(p_what) {

		case NOTIFICATION_DRAW: {

			if (polygon.size()<3)
				return;

			Vector<Vector2> points;
			Vector<Vector2> uvs;

			points.resize(polygon.size());

			int len = points.size();
			{

				DVector<Vector2>::Read polyr =polygon.read();
				for(int i=0;i<len;i++) {
					points[i]=polyr[i]+offset;
				}
			}

			if (invert) {

				Rect2 bounds;
				int highest_idx=-1;
				float highest_y=-1e20;
				float sum=0;

				for(int i=0;i<len;i++) {
					if (i==0)
						bounds.pos=points[i];
					else
						bounds.expand_to(points[i]);
					if (points[i].y>highest_y) {
						highest_idx=i;
						highest_y=points[i].y;
					}
					int ni=(i+1)%len;
					sum+=(points[ni].x-points[i].x)*(points[ni].y+points[i].y);
				}

				bounds=bounds.grow(invert_border);

				Vector2 ep[7]={
					Vector2(points[highest_idx].x,points[highest_idx].y+invert_border),
					Vector2(bounds.pos+bounds.size),
					Vector2(bounds.pos+Vector2(bounds.size.x,0)),
					Vector2(bounds.pos),
					Vector2(bounds.pos+Vector2(0,bounds.size.y)),
					Vector2(points[highest_idx].x-CMP_EPSILON,points[highest_idx].y+invert_border),
					Vector2(points[highest_idx].x-CMP_EPSILON,points[highest_idx].y),
				};


				if (sum>0) {
					SWAP(ep[1],ep[4]);
					SWAP(ep[2],ep[3]);
					SWAP(ep[5],ep[0]);
					SWAP(ep[6],points[highest_idx]);
				}

				points.resize(points.size()+7);
				for(int i=points.size()-1;i>=highest_idx+7;i--) {

					points[i]=points[i-7];
				}

				for(int i=0;i<7;i++) {

					points[highest_idx+i+1]=ep[i];
				}


				len=points.size();

			}

			if (texture.is_valid()) {

				Matrix32 texmat(tex_rot,tex_ofs);
				texmat.scale(tex_scale);
				Size2 tex_size=Vector2(1,1);

				tex_size=texture->get_size();
				uvs.resize(points.size());

				if (points.size()==uv.size()) {

					DVector<Vector2>::Read uvr = uv.read();

					for(int i=0;i<len;i++) {
						uvs[i]=texmat.xform(uvr[i])/tex_size;
					}

				} else {
					for(int i=0;i<len;i++) {
						uvs[i]=texmat.xform(points[i])/tex_size;
					}
				}

			}


			Vector<Color> colors;
			colors.push_back(color);
			Vector<int> indices = Geometry::triangulate_polygon(points);

			VS::get_singleton()->canvas_item_add_triangle_array(get_canvas_item(),indices,points,colors,uvs,texture.is_valid()?texture->get_rid():RID());

		} break;
	}
}


void Polygon2D::set_polygon(const DVector<Vector2>& p_polygon) {
	polygon=p_polygon;
	rect_cache_dirty=true;
	update();
}

DVector<Vector2> Polygon2D::get_polygon() const{

	return polygon;
}


void Polygon2D::set_uv(const DVector<Vector2>& p_uv) {

	uv=p_uv;
	update();
}

DVector<Vector2> Polygon2D::get_uv() const{

	return uv;
}

void Polygon2D::set_color(const Color& p_color){

	color=p_color;
	update();
}
Color Polygon2D::get_color() const{

	return color;
}

void Polygon2D::set_texture(const Ref<Texture>& p_texture){

	texture=p_texture;

	/*if (texture.is_valid()) {
		uint32_t flags=texture->get_flags();
		flags&=~Texture::FLAG_REPEAT;
		if (tex_tile)
			flags|=Texture::FLAG_REPEAT;

		texture->set_flags(flags);
	}*/
	update();
}
Ref<Texture> Polygon2D::get_texture() const{

	return texture;
}


void Polygon2D::set_texture_offset(const Vector2& p_offset){

	tex_ofs=p_offset;
	update();
}
Vector2 Polygon2D::get_texture_offset() const{

	return tex_ofs;
}

void Polygon2D::set_texture_rotation(float p_rot){

	tex_rot=p_rot;
	update();
}
float Polygon2D::get_texture_rotation() const{

	return tex_rot;
}


void Polygon2D::_set_texture_rotationd(float p_rot){

	set_texture_rotation(Math::deg2rad(p_rot));
}
float Polygon2D::_get_texture_rotationd() const{

	return Math::rad2deg(get_texture_rotation());
}


void Polygon2D::set_texture_scale(const Vector2& p_scale){

	tex_scale=p_scale;
	update();
}
Vector2 Polygon2D::get_texture_scale() const{

	return tex_scale;
}

void Polygon2D::set_invert(bool p_invert){

	invert=p_invert;
	update();
}
bool Polygon2D::get_invert() const{

	return invert;
}

void Polygon2D::set_invert_border(float p_invert_border){

	invert_border=p_invert_border;
	update();
}
float Polygon2D::get_invert_border() const{

	return invert_border;
}

void Polygon2D::set_offset(const Vector2& p_offset) {

	offset=p_offset;
	rect_cache_dirty=true;
	update();
}

Vector2 Polygon2D::get_offset() const {

	return offset;
}


void Polygon2D::_bind_methods() {

	ObjectTypeDB::bind_method(_MD("set_polygon","polygon"),&Polygon2D::set_polygon);
	ObjectTypeDB::bind_method(_MD("get_polygon"),&Polygon2D::get_polygon);

	ObjectTypeDB::bind_method(_MD("set_uv","uv"),&Polygon2D::set_uv);
	ObjectTypeDB::bind_method(_MD("get_uv"),&Polygon2D::get_uv);

	ObjectTypeDB::bind_method(_MD("set_color","color"),&Polygon2D::set_color);
	ObjectTypeDB::bind_method(_MD("get_color"),&Polygon2D::get_color);

	ObjectTypeDB::bind_method(_MD("set_texture","texture"),&Polygon2D::set_texture);
	ObjectTypeDB::bind_method(_MD("get_texture"),&Polygon2D::get_texture);

	ObjectTypeDB::bind_method(_MD("set_texture_offset","texture_offset"),&Polygon2D::set_texture_offset);
	ObjectTypeDB::bind_method(_MD("get_texture_offset"),&Polygon2D::get_texture_offset);

	ObjectTypeDB::bind_method(_MD("set_texture_rotation","texture_rotation"),&Polygon2D::set_texture_rotation);
	ObjectTypeDB::bind_method(_MD("get_texture_rotation"),&Polygon2D::get_texture_rotation);

	ObjectTypeDB::bind_method(_MD("_set_texture_rotationd","texture_rotation"),&Polygon2D::_set_texture_rotationd);
	ObjectTypeDB::bind_method(_MD("_get_texture_rotationd"),&Polygon2D::_get_texture_rotationd);

	ObjectTypeDB::bind_method(_MD("set_texture_scale","texture_scale"),&Polygon2D::set_texture_scale);
	ObjectTypeDB::bind_method(_MD("get_texture_scale"),&Polygon2D::get_texture_scale);


	ObjectTypeDB::bind_method(_MD("set_invert","invert"),&Polygon2D::set_invert);
	ObjectTypeDB::bind_method(_MD("get_invert"),&Polygon2D::get_invert);

	ObjectTypeDB::bind_method(_MD("set_invert_border","invert_border"),&Polygon2D::set_invert_border);
	ObjectTypeDB::bind_method(_MD("get_invert_border"),&Polygon2D::get_invert_border);

	ObjectTypeDB::bind_method(_MD("set_offset","offset"),&Polygon2D::set_offset);
	ObjectTypeDB::bind_method(_MD("get_offset"),&Polygon2D::get_offset);



	ADD_PROPERTY( PropertyInfo(Variant::VECTOR2_ARRAY,"polygon"),_SCS("set_polygon"),_SCS("get_polygon"));
	ADD_PROPERTY( PropertyInfo(Variant::VECTOR2_ARRAY,"uv"),_SCS("set_uv"),_SCS("get_uv"));
	ADD_PROPERTY( PropertyInfo(Variant::COLOR,"color"),_SCS("set_color"),_SCS("get_color"));
	ADD_PROPERTY( PropertyInfo(Variant::VECTOR2,"offset"),_SCS("set_offset"),_SCS("get_offset"));
	ADD_PROPERTY( PropertyInfo(Variant::OBJECT,"texture/texture",PROPERTY_HINT_RESOURCE_TYPE,"Texture"),_SCS("set_texture"),_SCS("get_texture"));
	ADD_PROPERTY( PropertyInfo(Variant::VECTOR2,"texture/offset"),_SCS("set_texture_offset"),_SCS("get_texture_offset"));
	ADD_PROPERTY( PropertyInfo(Variant::VECTOR2,"texture/scale"),_SCS("set_texture_scale"),_SCS("get_texture_scale"));
	ADD_PROPERTY( PropertyInfo(Variant::REAL,"texture/rotation",PROPERTY_HINT_RANGE,"-1440,1440,0.1"),_SCS("_set_texture_rotationd"),_SCS("_get_texture_rotationd"));
	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"invert/enable"),_SCS("set_invert"),_SCS("get_invert"));
	ADD_PROPERTY( PropertyInfo(Variant::REAL,"invert/border",PROPERTY_HINT_RANGE,"0.1,16384,0.1"),_SCS("set_invert_border"),_SCS("get_invert_border"));

}

Polygon2D::Polygon2D() {

	invert=0;
	invert_border=100;
	tex_rot=0;
	tex_tile=true;
	tex_scale=Vector2(1,1);
	color=Color(1,1,1);
	rect_cache_dirty=true;
}
