/****************************************************************************
 Copyright (c) 2013 cocos2d-x.org
 
 http://www.cocos2d-x.org
 
 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 "CCPhysicsSetting.h"
#ifdef CC_USE_PHYSICS

#ifndef __CCPHYSICS_WORLD_H__
#define __CCPHYSICS_WORLD_H__

#include <list>

#include "CCObject.h"
#include "CCGeometry.h"

NS_CC_BEGIN

class PhysicsBody;
class PhysicsJoint;
class PhysicsWorldInfo;
class PhysicsShape;
class PhysicsContact;
class PhysicsContactListener;
class Array;

class Sprite;
class Scene;
class DrawNode;

class PhysicsWorld;
class PhysicsRayCastCallback
{
public:
    PhysicsRayCastCallback()
    : report(nullptr)
    {}
    virtual ~PhysicsRayCastCallback(){}
	/**
     * @brief Called for each fixture found in the query. You control how the ray cast
	 * proceeds by returning a float:
	 * return true: continue
	 * return false: terminate the ray cast
	 * @param fixture the fixture hit by the ray
	 * @param point the point of initial intersection
	 * @param normal the normal vector at the point of intersection
	 * @return true to continue, false to terminate
     */
    std::function<bool(PhysicsWorld&, PhysicsShape&, Point, Point, float, void*)> report;
};

class PhysicsRectQueryCallback
{
public:
    PhysicsRectQueryCallback()
    : report(nullptr)
    {}
    virtual ~PhysicsRectQueryCallback(){}
    
public:
    std::function<bool(PhysicsWorld&, PhysicsShape&, void*)> report;
};

/**
 * @brief An PhysicsWorld object simulates collisions and other physical properties. You do not create PhysicsWorld objects directly; instead, you can get it from an Scene object.
 */
class PhysicsWorld
{
public:
    /** Adds a joint to the physics world.*/
    void addJoint(PhysicsJoint* joint);
    /** Removes a joint from the physics world.*/
    void removeJoint(PhysicsJoint* joint);
    /** Remove all joints from the physics world.*/
    void removeAllJoints();
    
    void rayCast(PhysicsRayCastCallback& callback, Point point1, Point point2, void* data);
    void rectQuery(PhysicsRectQueryCallback& callback, Rect rect, void* data);
    Array* getShapesAtPoint(Point point);
    PhysicsShape* getShapeAtPoint(Point point);
    Array* getAllBodies() const;
    PhysicsBody* getBodyByTag(int tag);
    
    /** Register a listener to receive contact callbacks*/
    inline void registerContactListener(PhysicsContactListener* delegate) { _listener = delegate; }
    /** Unregister a listener. */
    inline void unregisterContactListener() { _listener = nullptr; }
    
    /** get the gravity value */
    inline Point getGravity() { return _gravity; }
    /** set the gravity value */
    void setGravity(Point gravity);
    
    /** test the debug draw is enabled */
    inline bool isDebugDraw() { return _debugDraw; }
    /** set the debug draw */
    inline void setDebugDraw(bool debugDraw) { _debugDraw = debugDraw; }
    
    virtual void removeBody(PhysicsBody* body);
    virtual void removeBodyByTag(int tag);
    virtual void removeAllBodies();
    
protected:
    static PhysicsWorld* create();
    bool init();
    
    void setScene(Scene* scene);
    
    virtual PhysicsBody* addBody(PhysicsBody* body);
    virtual PhysicsShape* addShape(PhysicsShape* shape);
    virtual void removeShape(PhysicsShape* shape);
    virtual void update(float delta);
    
    virtual void debugDraw();
    virtual void drawWithShape(DrawNode* node, PhysicsShape* shape);
    virtual void drawWithJoint(DrawNode* node, PhysicsJoint* joint);
    
    
    virtual int collisionBeginCallback(PhysicsContact& contact);
    virtual int collisionPreSolveCallback(PhysicsContact& contact);
    virtual void collisionPostSolveCallback(PhysicsContact& contact);
    virtual void collisionSeparateCallback(PhysicsContact& contact);
    
protected:
    Point _gravity;
    float _speed;
    PhysicsWorldInfo* _info;
    PhysicsContactListener* _listener;
    
    
    Array* _bodies;
    std::list<PhysicsJoint*> _joints;
    Scene* _scene;
    
    bool _debugDraw;
    DrawNode* _drawNode;
    
protected:
    PhysicsWorld();
    virtual ~PhysicsWorld();
    
    friend class Sprite;
    friend class Scene;
    friend class PhysicsBody;
    friend class PhysicsShape;
    friend class PhysicsWorldCallback;
};

NS_CC_END

#endif // __CCPHYSICS_WORLD_H__

#endif // CC_USE_PHYSICS