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#ifndef PHYSICS_HH

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#define PHYSICS_HH

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#include "Vector.hh"

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#include <vector>

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#include <ClanLib/core.h>

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typedef uint16_t TimeMS;

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const TimeMS PHYSICS_TICK_MS = 10;

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enum TerrainType {EMPTY, DIRT, ROCK};

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// forward-declare

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class PhysicsObject;

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class PhysicsWorld {

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    friend class PhysicsObject;

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private:

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    CL_Timer tick_timer;

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protected:

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    std::vector<PhysicsObject*> objects;

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    Vector gravity;

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    Vector dimensions; //const requested

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    std::vector<std::vector<TerrainType> > terrain;

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    CL_SlotContainer slots;

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    PhysicsWorld (Vector gravity, Vector dimensions);

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public:

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    void addObject (PhysicsObject *object);

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    void tick (void);

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    void generateTerrain (int seed);

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    bool collided (Vector oldPos, Vector newPos);

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    TerrainType getType(Vector pos) const;

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};

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class PhysicsObject {

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protected:

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    PhysicsWorld &world;

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    float mass;

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    Vector position;

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    Vector velocity;

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    // Whether the object (worms mainly) is in the air 

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    // or firmly on the ground. Affects to physics.

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    bool inAir;

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    PhysicsObject (PhysicsWorld &world, float mass, Vector position, Vector velocity);

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    virtual void applyForce (Vector force, TimeMS dt);

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    void updatePhysics (Vector position, Vector velocity);

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private:

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    void updatePosition (void);

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    /**

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     * Use RK4 to integrate the effects of force over a time intervall.

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     */

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    void integrate(Vector force, TimeMS dt);

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public:

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    Vector getPosition (void);

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    void tick (void);

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};

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#endif