/*
 * World.h
 *
 *  Created on: 29.08.2012
 *      Author: Felix
 */

#ifndef DG_WORLD_H_
#define DG_WORLD_H_

#include "abstract/Character.h"
#include "abstract/Sprite.h"

class Character;
class Sprite;

/**
 * A collection of sprites, which can be put into different layers.
 *
 * Uses Sprite instead of sf::Drawable to also manage deleting objects.
 * Render order is determined by Physical::Category (higher number on top).
 */
class World : public sf::Drawable {
public:
	void insert(std::shared_ptr<Sprite> drawable);
	void remove(std::shared_ptr<Sprite> drawable);
	void insertCharacter(std::shared_ptr<Character> character);
	void removeCharacter(std::shared_ptr<Character> character);
	void step(int elapsed);
	void think(int elapsed);
	void insertArea(const sf::IntRect& rect);
	void generatePortals();
	std::vector<sf::Vector2f> getPath(const sf::Vector2f& start,
			const sf::Vector2f& end, float radius) const;
	std::vector<std::shared_ptr<Character> >
			getCharacters(const sf::Vector2f& position, float maxDistance) const;

private:
	struct Area;
	/**
	 * Edges
	 *
	 * Redundant data as portals are saved twice.
	 */
	struct Portal {
		Portal() = default;
		Portal(const sf::Vector2i& start, const sf::Vector2i& end);
		bool operator==(const Portal& p) {
		    return start == p.start && end == p.end && area == p.area;
		}
		sf::Vector2i start;
		sf::Vector2i end;
		Area* area;
	};

	/**
	 * Nodes
	 */
	struct Area {
		sf::IntRect area;
		sf::Vector2i center;
		std::vector<Portal> portals;
	};

private:
    void draw(sf::RenderTarget& target, sf::RenderStates states) const;
    bool testCollision(std::shared_ptr<Sprite> spriteA, std::shared_ptr<Sprite> spriteB,
    		int elapsed) const;
    Area* getArea(const sf::Vector2f& point) const;
    float heuristic_cost_estimate(Area* start, Area* end) const;
    std::vector<Portal*> astarArea(Area* start, Area* end) const;

private:
    static const float WALL_DISTANCE_MULTIPLIER;
	std::map<Sprite::Category, std::vector<std::shared_ptr<Sprite> > > mDrawables;
	std::vector<Area> mAreas; //< This has to be a vector as objects are compared by address.
	std::vector<std::shared_ptr<Character> > mCharacters;
};

#endif /* DG_WORLD_H_ */