#ifndef PHYSICS_HH
#define PHYSICS_HH

#include "Vector.hh"

#include <ClanLib/core.h>

const uint16_t PHYSICS_TICK_MS = 50;
const uint16_t PHYSICS_WORLD_WIDTH = 800;
const uint16_t PHYSICS_WORLD_HEIGHT = 600;
const Vector GRAVITY_FORCE(0,-1); 

// forward-declare
class PhysicsObject;

class PhysicsWorld {
    private:
        CL_Timer tick_timer;

    protected:
        std::vector<PhysicsObject*> objects;
        Vector dimensions;

        CL_SlotContainer slots;
        
        PhysicsWorld (Vector dimensions);

    public:
        void addObject (PhysicsObject *object);

        void tick (void);
};

class PhysicsObject {
    protected:
        Vector position;
        Vector velocity;
        Vector force;
        uint16_t mass;
    
        PhysicsObject (uint16_t mass, Vector position, Vector velocity, Vector force);
    
    private:
        void updatePosition (void);

    protected:
        void applyForce (Vector force);
        void updatePhysics (Vector position, Vector velocity, Vector force);
    
    public:
        Vector getPosition (void);

        void tick (void);
};

void tickObject(PhysicsObject* obj);

#endif