feat: expose methods for game state event handling

src/main/java/uulm/teamname/marvelous/gamelibrary/entities/StoneType.java

@@ -1,7 +1,6 @@
 package uulm.teamname.marvelous.gamelibrary.entities;
 
 import java.util.HashMap;
-import java.util.Map;
 
 /** Specifies the type of an {@link InfinityStone}. */
 public enum StoneType {

src/main/java/uulm/teamname/marvelous/gamelibrary/gamelogic/GameInstance.java

@@ -2,6 +2,7 @@ package uulm.teamname.marvelous.gamelibrary.gamelogic;
 
 import uulm.teamname.marvelous.gamelibrary.IntVector2;
 import uulm.teamname.marvelous.gamelibrary.events.Event;
+import uulm.teamname.marvelous.gamelibrary.events.EventType;
 import uulm.teamname.marvelous.gamelibrary.requests.Request;
 
 import java.util.Observer;
@@ -66,6 +67,22 @@ public class GameInstance {
         return manager.processRequests(requests, false);
     }
 
+    /**
+     * Produces a {@link EventType#GamestateEvent} for the current {@link GameState}.
+     * @return The resulting event
+     */
+    public Event getGameStateEvent() {
+        return GameLogic.buildGameStateEvent(_state);
+    }
+
+    /**
+     * Restores the current {@link GameState} based on the given one.
+     * @param state The state to restore from
+     */
+    public void setGameState(GameState state) {
+        _state.restore(state);
+    }
+
     /**
      * Applies an array of {@link Event}s to the game state.
      * @param events The events to apply.

src/main/java/uulm/teamname/marvelous/gamelibrary/gamelogic/GameLogic.java

@@ -174,18 +174,27 @@ class GameLogic {
                 }
             }
             case Req -> {
-                result.add(new EventBuilder(EventType.GamestateEvent)
+                result.add(buildGameStateEvent(state));
+            }
+        }
+
+        return result;
+    }
+
+    /**
+     * Builds a {@link EventType#GamestateEvent} for the given {@link GameState}.
+     * @param state The game state to use
+     * @return The resulting event
+     */
+    public static Event buildGameStateEvent(GameState state) {
+        return new EventBuilder(EventType.GamestateEvent)
                 .withEntities(state.entities.export())
                 .withTurnOrder((EntityID[])state.turnOrder.toArray())
                 .withMapSize(state.mapSize)
                 .withActiveCharacter(state.activeCharacter)
                 .withStoneCooldowns(state.stoneCooldown.export())
                 .withWinCondition(state.won)
-                        .buildGameStateEvent());
-            }
-        }
-
-        return result;
+                .buildGameStateEvent();
     }
 
     /**

src/main/java/uulm/teamname/marvelous/gamelibrary/gamelogic/GameState.java

@@ -74,4 +74,33 @@ class GameState {
 
         return clone;
     }
+
+    /**
+     * Restores the state rom the given {@link GameState}. This is slow.
+     * @param state The state to restore from
+     */
+    public void restore(GameState state) {
+        mapSize.set(state.mapSize);
+
+        entities.cloneFrom(state.entities);
+
+        roundNumber = state.roundNumber;
+
+        turnOrder = new ArrayList<>();
+        for(EntityID id: state.turnOrder) {
+            turnOrder.add(id.clone());
+        }
+
+        turnNumber = state.turnNumber;
+
+        activeCharacter = state.activeCharacter != null ? state.activeCharacter.clone() : null;
+
+        won = state.won;
+
+        stoneCooldown.cloneFrom(state.stoneCooldown);
+
+        for(Tuple<ParticipantType, WinCondition> condition: state.winConditions.keySet()) {
+            winConditions.put(condition, state.winConditions.get(condition));
+        }
+    }
 }