feat: darkness gating for go/look/take/examine + HUD light

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Semesterprojekt/src/main/java/thb/jeanluc/adventure/command/impl/ExamineCommand.java

@@ -2,6 +2,7 @@ package thb.jeanluc.adventure.command.impl;
 
 import thb.jeanluc.adventure.command.Command;
 import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.game.Light;
 import thb.jeanluc.adventure.model.Npc;
 import thb.jeanluc.adventure.model.item.Item;
 
@@ -20,6 +21,10 @@ public class ExamineCommand implements Command {
             ctx.getIo().write("Examine what?");
             return;
         }
+        if (!Light.isLit(ctx, ctx.getPlayer().getCurrentRoom())) {
+            ctx.getIo().write("It's too dark to see that.");
+            return;
+        }
         String id = args.getFirst();
         Optional<Item> item = ctx.getPlayer().findItem(id);
         if (item.isEmpty()) {

Semesterprojekt/src/main/java/thb/jeanluc/adventure/command/impl/GoCommand.java

@@ -3,6 +3,7 @@ package thb.jeanluc.adventure.command.impl;
 import thb.jeanluc.adventure.command.Command;
 import thb.jeanluc.adventure.game.Conditions;
 import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.game.Light;
 import thb.jeanluc.adventure.model.Direction;
 import thb.jeanluc.adventure.model.ExitLock;
 import thb.jeanluc.adventure.model.Room;
@@ -39,6 +40,11 @@ public class GoCommand implements Command {
             ctx.getIo().write(lock.blocked());
             return;
         }
+        if (!Light.isLit(ctx, next.get())) {
+            ctx.getIo().write("It's pitch black beyond the doorway — you need a lit light source "
+                    + "(try lighting your lamp with 'use lamp').");
+            return;
+        }
         ctx.getPlayer().setCurrentRoom(next.get());
         new LookCommand().execute(ctx, List.of());
     }

Semesterprojekt/src/main/java/thb/jeanluc/adventure/command/impl/LookCommand.java

@@ -3,6 +3,7 @@ package thb.jeanluc.adventure.command.impl;
 import thb.jeanluc.adventure.command.Command;
 import thb.jeanluc.adventure.game.Conditions;
 import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.game.Light;
 import thb.jeanluc.adventure.io.text.RoomView;
 import thb.jeanluc.adventure.model.DescriptionState;
 import thb.jeanluc.adventure.model.Direction;
@@ -21,6 +22,10 @@ public class LookCommand implements Command {
     @Override
     public void execute(GameContext ctx, List<String> args) {
         Room room = ctx.getPlayer().getCurrentRoom();
+        if (!Light.isLit(ctx, room)) {
+            ctx.getIo().write("It's pitch black; you can't make anything out. You need a light source.");
+            return;
+        }
         List<String> items = room.getItems().values().stream().map(Item::getName).toList();
         List<String> npcs = room.getNpcs().values().stream().map(Npc::getName).toList();
         List<String> exits = room.getExits().keySet().stream().map(Direction::getLabel).toList();

Semesterprojekt/src/main/java/thb/jeanluc/adventure/command/impl/TakeCommand.java

@@ -2,6 +2,7 @@ package thb.jeanluc.adventure.command.impl;
 
 import thb.jeanluc.adventure.command.Command;
 import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.game.Light;
 import thb.jeanluc.adventure.model.Room;
 import thb.jeanluc.adventure.model.item.Item;
 
@@ -20,6 +21,10 @@ public class TakeCommand implements Command {
             ctx.getIo().write("Take what?");
             return;
         }
+        if (!Light.isLit(ctx, ctx.getPlayer().getCurrentRoom())) {
+            ctx.getIo().write("It's too dark to see that.");
+            return;
+        }
         String itemId = args.getFirst();
         Room room = ctx.getPlayer().getCurrentRoom();
         Optional<Item> taken = room.removeItem(itemId);

Semesterprojekt/src/main/java/thb/jeanluc/adventure/game/Game.java

@@ -77,7 +77,7 @@ public class Game {
                 ctx.getPlayer().getCurrentRoom().getName(),
                 ctx.getPlayer().getGold(),
                 turn,
-                false));
+                Light.carryingLight(ctx)));
         MapView map = MapLayout.compute(
                 ctx.getWorld(),
                 ctx.getPlayer().getVisitedRoomIds(),

Semesterprojekt/src/test/java/thb/jeanluc/adventure/command/impl/DarknessTest.java

@@ -0,0 +1,64 @@
+package thb.jeanluc.adventure.command.impl;
+
+import org.junit.jupiter.api.Test;
+import thb.jeanluc.adventure.game.GameContext;
+import thb.jeanluc.adventure.io.TestIO;
+import thb.jeanluc.adventure.model.Direction;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+import thb.jeanluc.adventure.model.item.SwitchableItem;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class DarknessTest {
+    private SwitchableItem lamp(boolean on) {
+        return SwitchableItem.builder().id("lamp").name("Lamp").description("d")
+                .state(on).onText("on").offText("off").light(true).build();
+    }
+
+    @Test
+    void cannotEnterDarkRoomWithoutLight() {
+        Room hall = new Room("hall", "Hall", "d");
+        Room cave = new Room("cave", "Cave", "d");
+        cave.setDark(true);
+        hall.addExit(Direction.NORTH, cave);
+        Player p = new Player(hall, 0);
+        GameContext ctx = new GameContext(null, p, new TestIO());
+
+        new GoCommand().execute(ctx, List.of("north"));
+        assertThat(p.getCurrentRoom()).isEqualTo(hall);
+        assertThat(((TestIO) ctx.getIo()).allOutput()).containsIgnoringCase("pitch black");
+    }
+
+    @Test
+    void canEnterDarkRoomWithLitLamp() {
+        Room hall = new Room("hall", "Hall", "d");
+        Room cave = new Room("cave", "Cave", "d");
+        cave.setDark(true);
+        hall.addExit(Direction.NORTH, cave);
+        Player p = new Player(hall, 0);
+        p.addItem(lamp(true));
+        GameContext ctx = new GameContext(null, p, new TestIO());
+
+        new GoCommand().execute(ctx, List.of("north"));
+        assertThat(p.getCurrentRoom()).isEqualTo(cave);
+    }
+
+    @Test
+    void lookAndTakeAreBlockedInTheDark() {
+        Room cave = new Room("cave", "Cave", "d");
+        cave.setDark(true);
+        Player p = new Player(cave, 0);
+        TestIO io = new TestIO();
+        GameContext ctx = new GameContext(null, p, io);
+
+        new LookCommand().execute(ctx, List.of());
+        assertThat(io.allOutput()).containsIgnoringCase("pitch black");
+
+        io.outputs().clear();
+        new TakeCommand().execute(ctx, List.of("anything"));
+        assertThat(io.allOutput()).containsIgnoringCase("too dark");
+    }
+}