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#ifndef GAMESTATE_HH

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#define GAMESTATE_HH

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class GameState;

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#include "PhysicsWorld.hh"

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#include "Terrain.hh"

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#include "Player.hh"

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#include "Projectile.hh"

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#include "Config.hh"

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#include "Graphics/Drawable.hh"

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#include <list>

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#include <stdexcept>

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#include <cmath>

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class GameStateEventHandler {

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    friend class GameState;

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    protected:

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        virtual void on_player_joined (Player *p) = 0;

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        virtual void on_player_left (Player *p) = 0;

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};

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class GameState {

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public:

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    /**

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     * All active players

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     */

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    std::list<Player*> player_list;

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    /**

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     * All active projectiles

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     */

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    std::list<Projectile*> projectiles;

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    /**

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     * Our world simulation

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     */

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    PhysicsWorld world;

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    /**

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     * Our terrain

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     */

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    Terrain &terrain;

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    /**

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     * The one LocalPlayer that *we* control

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     */

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    LocalPlayer *local_player;

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protected:

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    /**

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     * Notify someone about events?

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     */

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    GameStateEventHandler *event_handler;

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public:    

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    /**

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     * Create the game world, using the given terrain

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     *

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     * @param terrain the world's terrain

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     */

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    GameState (Terrain &terrain);

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    /**

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     * Set event handler, only one can be set

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     */

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    void setEventHandler (GameStateEventHandler *handler);

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    /**

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     * Adds projectile to our list of projectiles to draw

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     */

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    void addProjectile(Projectile *projectile);

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    /**

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     * Get our current LocalPlayer if we have one, else return NULL (client hasn't connected yet)

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     */

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    LocalPlayer *getLocalPlayer (void);

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    /**

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     * Check that local_player is NULL, and sets it to the given player

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     */

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    void setLocalPlayer (LocalPlayer *player);        

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    /**

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     * Add the given player to our player_list

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     */

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    void addPlayer (Player *player);

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    /**

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     * Removes the given player from player_list. If the given player was the local_player, set that to NULL

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     */

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    void removePlayer (Player *player);

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#if GRAPHICS_ENABLED    

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    /**

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     * Draws the terrain, players and projectiles

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     */

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    virtual void draw (graphics::Display &display, PixelCoordinate camera, bool displayWeapon);

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#endif

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};

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#endif