/*************************************************************************/
/*  navigation_polygon.cpp                                               */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "navigation_polygon.h"
#include "navigation2d.h"
#include "triangulator.h"
#include "core_string_names.h"

void NavigationPolygon::set_vertices(const DVector<Vector2>& p_vertices) {

	vertices=p_vertices;
}

DVector<Vector2> NavigationPolygon::get_vertices() const{

	return vertices;
}


void NavigationPolygon::_set_polygons(const Array& p_array) {

	polygons.resize(p_array.size());
	for(int i=0;i<p_array.size();i++) {
		polygons[i].indices=p_array[i];
	}
}

Array NavigationPolygon::_get_polygons() const {

	Array ret;
	ret.resize(polygons.size());
	for(int i=0;i<ret.size();i++) {
		ret[i]=polygons[i].indices;
	}

	return ret;
}

void NavigationPolygon::_set_outlines(const Array& p_array) {

	outlines.resize(p_array.size());
	for(int i=0;i<p_array.size();i++) {
		outlines[i]=p_array[i];
	}
}

Array NavigationPolygon::_get_outlines() const {

	Array ret;
	ret.resize(outlines.size());
	for(int i=0;i<ret.size();i++) {
		ret[i]=outlines[i];
	}

	return ret;
}


void NavigationPolygon::add_polygon(const Vector<int>& p_polygon){

	Polygon polygon;
	polygon.indices=p_polygon;
	polygons.push_back(polygon);

}

void NavigationPolygon::add_outline_at_index(const DVector<Vector2>& p_outline,int p_index) {

	outlines.insert(p_index,p_outline);
}

int NavigationPolygon::get_polygon_count() const{

	return polygons.size();
}
Vector<int> NavigationPolygon::get_polygon(int p_idx){

	ERR_FAIL_INDEX_V(p_idx,polygons.size(),Vector<int>());
	return polygons[p_idx].indices;
}
void NavigationPolygon::clear_polygons(){

	polygons.clear();
}

void NavigationPolygon::add_outline(const DVector<Vector2>& p_outline) {

	outlines.push_back(p_outline);
}

int NavigationPolygon::get_outline_count() const{

	return outlines.size();
}

void NavigationPolygon::set_outline(int p_idx,const DVector<Vector2>& p_outline) {
	ERR_FAIL_INDEX(p_idx,outlines.size());
	outlines[p_idx]=p_outline;
}

void NavigationPolygon::remove_outline(int p_idx) {

	ERR_FAIL_INDEX(p_idx,outlines.size());
	outlines.remove(p_idx);

}

DVector<Vector2> NavigationPolygon::get_outline(int p_idx) const {
	ERR_FAIL_INDEX_V(p_idx,outlines.size(),DVector<Vector2>());
	return outlines[p_idx];
}

void NavigationPolygon::clear_outlines(){

	outlines.clear();;
}
void NavigationPolygon::make_polygons_from_outlines(){

	List<TriangulatorPoly> in_poly,out_poly;

	Vector2 outside_point(-1e10,-1e10);

	for(int i=0;i<outlines.size();i++) {

		DVector<Vector2> ol = outlines[i];
		int olsize = ol.size();
		if (olsize<3)
			continue;
		DVector<Vector2>::Read r=ol.read();
		for(int j=0;j<olsize;j++) {
			outside_point.x = MAX( r[j].x, outside_point.x );
			outside_point.y = MAX( r[j].y, outside_point.y );
		}

	}

	outside_point+=Vector2(0.7239784,0.819238); //avoid precision issues



	for(int i=0;i<outlines.size();i++) {

		DVector<Vector2> ol = outlines[i];
		int olsize = ol.size();
		if (olsize<3)
			continue;
		DVector<Vector2>::Read r=ol.read();

		int interscount=0;
		//test if this is an outer outline
		for(int k=0;k<outlines.size();k++) {

			if (i==k)
				continue; //no self intersect

			DVector<Vector2> ol2 = outlines[k];
			int olsize2 = ol2.size();
			if (olsize2<3)
				continue;
			DVector<Vector2>::Read r2=ol2.read();

			for(int l=0;l<olsize2;l++) {

				if (Geometry::segment_intersects_segment_2d(r[0],outside_point,r2[l],r2[(l+1)%olsize2],NULL)) {
					interscount++;
				}
			}

		}

		bool outer = (interscount%2)==0;

		TriangulatorPoly tp;
		tp.Init(olsize);
		for(int j=0;j<olsize;j++) {
			tp[j]=r[j];
		}

		if (outer)
			tp.SetOrientation(TRIANGULATOR_CCW);
		else {
			tp.SetOrientation(TRIANGULATOR_CW);
			tp.SetHole(true);
		}

		in_poly.push_back(tp);
	}


	TriangulatorPartition tpart;
	if (tpart.ConvexPartition_HM(&in_poly,&out_poly)==0) { //failed!
		print_line("convex partition failed!");
		return;
	}

	polygons.clear();
	vertices.resize(0);

	Map<Vector2,int> points;
	for(List<TriangulatorPoly>::Element*I = out_poly.front();I;I=I->next()) {

		TriangulatorPoly& tp = I->get();

		struct Polygon p;

		for(int i=0;i<tp.GetNumPoints();i++) {

			Map<Vector2,int>::Element *E=points.find(tp[i]);
			if (!E) {
				E=points.insert(tp[i],vertices.size());
				vertices.push_back(tp[i]);
			}
			p.indices.push_back(E->get());
		}

		polygons.push_back(p);
	}

	emit_signal(CoreStringNames::get_singleton()->changed);
}


void NavigationPolygon::_bind_methods() {

	ClassDB::bind_method(_MD("set_vertices","vertices"),&NavigationPolygon::set_vertices);
	ClassDB::bind_method(_MD("get_vertices"),&NavigationPolygon::get_vertices);

	ClassDB::bind_method(_MD("add_polygon","polygon"),&NavigationPolygon::add_polygon);
	ClassDB::bind_method(_MD("get_polygon_count"),&NavigationPolygon::get_polygon_count);
	ClassDB::bind_method(_MD("get_polygon","idx"),&NavigationPolygon::get_polygon);
	ClassDB::bind_method(_MD("clear_polygons"),&NavigationPolygon::clear_polygons);

	ClassDB::bind_method(_MD("add_outline","outline"),&NavigationPolygon::add_outline);
	ClassDB::bind_method(_MD("add_outline_at_index","outline","index"),&NavigationPolygon::add_outline_at_index);
	ClassDB::bind_method(_MD("get_outline_count"),&NavigationPolygon::get_outline_count);
	ClassDB::bind_method(_MD("set_outline","idx","outline"),&NavigationPolygon::set_outline);
	ClassDB::bind_method(_MD("get_outline","idx"),&NavigationPolygon::get_outline);
	ClassDB::bind_method(_MD("remove_outline","idx"),&NavigationPolygon::remove_outline);
	ClassDB::bind_method(_MD("clear_outlines"),&NavigationPolygon::clear_outlines);
	ClassDB::bind_method(_MD("make_polygons_from_outlines"),&NavigationPolygon::make_polygons_from_outlines);

	ClassDB::bind_method(_MD("_set_polygons","polygons"),&NavigationPolygon::_set_polygons);
	ClassDB::bind_method(_MD("_get_polygons"),&NavigationPolygon::_get_polygons);

	ClassDB::bind_method(_MD("_set_outlines","outlines"),&NavigationPolygon::_set_outlines);
	ClassDB::bind_method(_MD("_get_outlines"),&NavigationPolygon::_get_outlines);

	ADD_PROPERTY(PropertyInfo(Variant::VECTOR3_ARRAY,"vertices",PROPERTY_HINT_NONE,"",PROPERTY_USAGE_NOEDITOR),_SCS("set_vertices"),_SCS("get_vertices"));
	ADD_PROPERTY(PropertyInfo(Variant::ARRAY,"polygons",PROPERTY_HINT_NONE,"",PROPERTY_USAGE_NOEDITOR),_SCS("_set_polygons"),_SCS("_get_polygons"));
	ADD_PROPERTY(PropertyInfo(Variant::ARRAY,"outlines",PROPERTY_HINT_NONE,"",PROPERTY_USAGE_NOEDITOR),_SCS("_set_outlines"),_SCS("_get_outlines"));
}

NavigationPolygon::NavigationPolygon() {


}

void NavigationPolygonInstance::set_enabled(bool p_enabled) {

	if (enabled==p_enabled)
		return;
	enabled=p_enabled;

	if (!is_inside_tree())
		return;

	if (!enabled) {

		if (nav_id!=-1) {
			navigation->navpoly_remove(nav_id);
			nav_id=-1;
		}
	} else {

		if (navigation) {

			if (navpoly.is_valid()) {

				nav_id = navigation->navpoly_create(navpoly,get_relative_transform_to_parent(navigation),this);
			}
		}

	}

	if (get_tree()->is_editor_hint() || get_tree()->is_debugging_navigation_hint())
		update();

//	update_gizmo();
}

bool NavigationPolygonInstance::is_enabled() const {


	return enabled;
}


/////////////////////////////


void NavigationPolygonInstance::_notification(int p_what) {


	switch(p_what) {
		case NOTIFICATION_ENTER_TREE: {

			Node2D *c=this;
			while(c) {

				navigation=c->cast_to<Navigation2D>();
				if (navigation) {

					if (enabled && navpoly.is_valid()) {

						nav_id = navigation->navpoly_create(navpoly,get_relative_transform_to_parent(navigation),this);
					}
					break;
				}

				c=c->get_parent()->cast_to<Node2D>();
			}

		} break;
		case NOTIFICATION_TRANSFORM_CHANGED: {

			if (navigation && nav_id!=-1) {
				navigation->navpoly_set_transform(nav_id,get_relative_transform_to_parent(navigation));
			}

		} break;
		case NOTIFICATION_EXIT_TREE: {

			if (navigation) {

				if (nav_id!=-1) {
					navigation->navpoly_remove(nav_id);
					nav_id=-1;
				}
			}
			navigation=NULL;
		} break;
		case NOTIFICATION_DRAW: {

			if (is_inside_tree() && (get_tree()->is_editor_hint() || get_tree()->is_debugging_navigation_hint()) && navpoly.is_valid()) {

				DVector<Vector2> verts=navpoly->get_vertices();
				int vsize = verts.size();
				if (vsize<3)
					return;


				Color color;
				if (enabled) {
					color=get_tree()->get_debug_navigation_color();
				} else {
					color=get_tree()->get_debug_navigation_disabled_color();
				}
				Vector<Color> colors;
				Vector<Vector2> vertices;
				vertices.resize(vsize);
				colors.resize(vsize);
				{
					DVector<Vector2>::Read vr = verts.read();
					for(int i=0;i<vsize;i++) {
						vertices[i]=vr[i];
						colors[i]=color;
					}
				}

				Vector<int> indices;


				for(int i=0;i<navpoly->get_polygon_count();i++) {
					Vector<int> polygon = navpoly->get_polygon(i);

					for(int j=2;j<polygon.size();j++) {

						int kofs[3]={0,j-1,j};
						for(int k=0;k<3;k++) {

							int idx = polygon[ kofs[k] ];
							ERR_FAIL_INDEX(idx,vsize);
							indices.push_back(idx);
						}
					}
				}
				VS::get_singleton()->canvas_item_add_triangle_array(get_canvas_item(),indices,vertices,colors);

			}
		} break;

	}
}


void NavigationPolygonInstance::set_navigation_polygon(const Ref<NavigationPolygon>& p_navpoly) {

	if (p_navpoly==navpoly)
		return;

	if (navigation && nav_id!=-1) {
		navigation->navpoly_remove(nav_id);
		nav_id=-1;
	}
	if (navpoly.is_valid()) {
		navpoly->disconnect(CoreStringNames::get_singleton()->changed,this,"_navpoly_changed");
	}
	navpoly=p_navpoly;

	if (navpoly.is_valid()) {
		navpoly->connect(CoreStringNames::get_singleton()->changed,this,"_navpoly_changed");
	}

	if (navigation && navpoly.is_valid() && enabled) {
		nav_id = navigation->navpoly_create(navpoly,get_relative_transform_to_parent(navigation),this);
	}
	//update_gizmo();
	_change_notify("navpoly");
	update_configuration_warning();

}

Ref<NavigationPolygon> NavigationPolygonInstance::get_navigation_polygon() const{

	return navpoly;
}

void NavigationPolygonInstance::_navpoly_changed() {

	if (is_inside_tree() && (get_tree()->is_editor_hint() || get_tree()->is_debugging_navigation_hint()))
		update();
}


String NavigationPolygonInstance::get_configuration_warning() const {

	if (!is_visible() || !is_inside_tree())
		return String();

	if (!navpoly.is_valid()) {
		return TTR("A NavigationPolygon resource must be set or created for this node to work. Please set a property or draw a polygon.");
	}
	const Node2D *c=this;
	while(c) {

		if (c->cast_to<Navigation2D>()) {
			return String();
		}

		c=c->get_parent()->cast_to<Node2D>();
	}

	return TTR("NavigationPolygonInstance must be a child or grandchild to a Navigation2D node. It only provides navigation data.");
}

void NavigationPolygonInstance::_bind_methods() {

	ClassDB::bind_method(_MD("set_navigation_polygon","navpoly:NavigationPolygon"),&NavigationPolygonInstance::set_navigation_polygon);
	ClassDB::bind_method(_MD("get_navigation_polygon:NavigationPolygon"),&NavigationPolygonInstance::get_navigation_polygon);

	ClassDB::bind_method(_MD("set_enabled","enabled"),&NavigationPolygonInstance::set_enabled);
	ClassDB::bind_method(_MD("is_enabled"),&NavigationPolygonInstance::is_enabled);

	ClassDB::bind_method(_MD("_navpoly_changed"),&NavigationPolygonInstance::_navpoly_changed);

	ADD_PROPERTY( PropertyInfo(Variant::OBJECT,"navpoly",PROPERTY_HINT_RESOURCE_TYPE,"NavigationPolygon"),_SCS("set_navigation_polygon"),_SCS("get_navigation_polygon"));
	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"enabled"),_SCS("set_enabled"),_SCS("is_enabled"));
}

NavigationPolygonInstance::NavigationPolygonInstance() {

	navigation=NULL;
	nav_id=-1;
	enabled=true;

}