#ifndef ENGINE_HH
#define ENGINE_HH

// forward-declare
class Engine;

#include "GameState.hh"
#include "Configuration.hh"
#include "Logger.hh"

// forward-declare component pointer types
// XXX: move to some kind of Components.hh file?
namespace graphics { class Graphics; }
class NetworkServer;
class NetworkClientConnect;
class NetworkClient;

/**
 * This is the core class that glues all the other components together and runs the main loop
 */
class Engine {
    private:
        // game state
        Terrain *terrain;
        GameState *game_state;

        // Graphics/Input
        graphics::Graphics *graphics;

        // network server/client
        NetworkServer *net_server;
        NetworkClientConnect *net_client_connect;
        // XXX: currently unused: NetworkClient *net_client;

        // to exit the mainloop
        bool is_running;

        // ClanLib resources
        CL_ResourceManager resources;
    
    public:    
        // default constructor
        Engine (const std::string resource_xml_path = RESOURCE_XML_PATH);

        /**
         * Setup game world using the given terrain, returning the new GameState
         *
         * XXX: fix to return void
         */
        GameState& setupGame (Terrain *terrain);

        /**
         * Setup game world using given terrain configuration
         */
        void setupGame (const TerrainConfig &config);

        /**
         * Enable graphics. 
         *
         * Requires: GRAPHICS_ENABLED
         */
        void setupGraphics (const DisplayConfig &config);
        
        /**
         * Setup server, must call setupGame first
         *
         * Requires: NETWORK_ENABLED
         */
        void setupNetworkServer (const std::string &listen_port);

        /**
         * Setup client, do *not* call setupGame, configuration comes from the server
         *
         * Requires: NETWORK_ENABLED
         */
        void setupNetworkClient (const std::string &connect_host, const std::string &connect_port);

        /**
         * Setup singleplayer, must call setupGame first
         */
		void setupSinglePlayer (void);
        
        /**
         * Run the game main loop. This will not return until the game aborts due to an error, or someone calls stop().
         */
        void run (void);
        
        /**
         * Terminate the main loop, causing run() to return once this loop iteration is finished
         */
        void stop (void);

    private:
        /**
         * Puts graphics into GameView mode, using our GameState and the given player
         */
        void startGameView (LocalPlayer *player);

    public:
        // get a pointer to our resource manager
        CL_ResourceManager* getResourceManager (void);

        // logging utility
        static Logger log (enum LogLevel level, const char *type);

};

#endif /* ENGINE_HH */