refactor: add game listener

include/game/BaseGame.h

@@ -12,11 +12,25 @@ enum class GameState : std::uint8_t {
     Game,
     EndGame,
     Disconnected,
+    Closed
 };
 
 typedef std::map<std::uint8_t, Player> PlayerList;
 
-class Game {
+class GameListener {
+public:
+    virtual void OnPlayerJoin(PlayerID player) {}
+    virtual void OnPlayerLeave(PlayerID player) {}
+
+    virtual void OnGameStateUpdate(GameState newState) {}
+    virtual void OnGameBegin() {}
+    virtual void OnGameEnd() {}
+    virtual void OnGameClose() {}
+};
+
+typedef utils::ObjectNotifier<GameListener> GameNotifier;
+
+class Game : public GameNotifier {
 protected:
     World* m_World;
     TeamList m_Teams = { Team{TeamColor::Red}, Team{TeamColor::Blue} };

include/game/World.h

@@ -125,8 +125,6 @@ class WorldListener {
 public:
     WorldListener() {}
 
-    virtual void OnGameEnd() {}
-
     virtual void OnTowerAdd(TowerPtr tower) {}
     virtual void OnTowerRemove(TowerPtr tower) {}
 
@@ -231,8 +229,6 @@ public:
     virtual void OnArrowShot(MobPtr target, bool fire, Tower* shooter);
     virtual void OnExplosion(utils::shape::Circle explosion, float centerDamage, Tower* shooter);
 
-    virtual void OnGameEnd();
-
     // MobListener
 
     virtual void OnMobDamage(Mob* target, float damage, Tower* source);

include/game/server/ServerGame.h

@@ -9,7 +9,7 @@ namespace server {
 
 class Server;
 
-class ServerGame : public game::Game {
+class ServerGame : public game::Game, public game::GameListener {
 private:
     Server* m_Server;
     ServerWorld m_ServerWorld;
@@ -22,6 +22,13 @@ public:
 
     virtual void tick(std::uint64_t delta);
     void startGame();
+
+    // GameListener
+
+    virtual void OnGameStateUpdate(game::GameState newState);
+    virtual void OnGameBegin();
+    virtual void OnGameEnd();
+    virtual void OnGameClose();
 private:
     void balanceTeams();
     void updateGoldMines();