feat: conditional NPC dialogue

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

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

@@ -1,7 +1,9 @@
 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.model.DialogueLine;
 import thb.jeanluc.adventure.model.Npc;
 
 import java.util.List;
@@ -24,7 +26,15 @@ public class TalkCommand implements Command {
             ctx.getIo().write("There is no '" + npcId + "' here to talk to.");
             return;
         }
-        ctx.getIo().write(npc.get().getName() + " says: " + npc.get().getGreeting());
+        Npc found = npc.get();
+        String line = found.getGreeting();
+        for (DialogueLine dl : found.getDialogue()) {
+            if (Conditions.all(dl.when(), ctx)) {
+                line = dl.text();
+                break;
+            }
+        }
+        ctx.getIo().write(found.getName() + " says: " + line);
     }
 
     @Override

Semesterprojekt/src/main/java/thb/jeanluc/adventure/loader/ReferenceResolver.java

@@ -113,10 +113,15 @@ public class ReferenceResolver {
      */
     public void resolveNpcs(List<NpcDto> npcDtos) {
         for (NpcDto dto : npcDtos) {
+            Npc npc = npcs.get(dto.id());
+            if (dto.dialogue() != null) {
+                for (DialogueLineDto dl : dto.dialogue()) {
+                    npc.addDialogue(new DialogueLine(ConditionDto.toModelList(dl.when()), dl.text()));
+                }
+            }
             if (dto.reactions() == null) {
                 continue;
             }
-            Npc npc = npcs.get(dto.id());
             for (ReactionDto r : dto.reactions()) {
                 if (r.onReceive() == null) {
                     throw new WorldLoadException(

Semesterprojekt/src/main/java/thb/jeanluc/adventure/loader/dto/NpcDto.java

@@ -10,12 +10,18 @@ import java.util.List;
  * @param description examine description
  * @param greeting    text the NPC says on {@code talk}
  * @param reactions   list of trigger/response definitions; may be null
+ * @param dialogue    optional condition-gated dialogue lines; may be null
  */
 public record NpcDto(
         String id,
         String name,
         String description,
         String greeting,
-        List<ReactionDto> reactions
+        List<ReactionDto> reactions,
+        List<DialogueLineDto> dialogue
 ) {
+    /** Backward-compatible constructor without dialogue. */
+    public NpcDto(String id, String name, String description, String greeting, List<ReactionDto> reactions) {
+        this(id, name, description, greeting, reactions, null);
+    }
 }

Semesterprojekt/src/main/java/thb/jeanluc/adventure/model/Npc.java

@@ -3,7 +3,9 @@ package thb.jeanluc.adventure.model;
 import lombok.Builder;
 import lombok.Getter;
 
+import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 
@@ -34,6 +36,19 @@ public class Npc {
      */
     private final Map<String, NpcReaction> reactions;
 
+    /** Optional condition-gated dialogue lines, first match wins; else {@link #greeting}. */
+    @Builder.Default
+    private final List<DialogueLine> dialogue = new ArrayList<>();
+
+    /**
+     * Adds a conditional dialogue line.
+     *
+     * @param line the dialogue line
+     */
+    public void addDialogue(DialogueLine line) {
+        dialogue.add(line);
+    }
+
     /**
      * Looks up a reaction triggered by an item.
      *

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

@@ -0,0 +1,37 @@
+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.Condition;
+import thb.jeanluc.adventure.model.DialogueLine;
+import thb.jeanluc.adventure.model.Npc;
+import thb.jeanluc.adventure.model.Player;
+import thb.jeanluc.adventure.model.Room;
+
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class DialogueTest {
+    @Test
+    void dialogueSwitchesWithFlagElseGreeting() {
+        Room room = new Room("k", "K", "d");
+        Npc man = Npc.shell("man", "Old Man", "stooped", "Hello there.");
+        man.addDialogue(new DialogueLine(
+                List.of(new Condition(Condition.Type.FLAG, "power_on")),
+                "The lights are back, bless you!"));
+        room.addNpc(man);
+        Player player = new Player(room, 0);
+        TestIO io = new TestIO();
+        GameContext ctx = new GameContext(null, player, io);
+
+        new TalkCommand().execute(ctx, List.of("man"));
+        assertThat(io.allOutput()).contains("Hello there");
+
+        io.outputs().clear();
+        ctx.getState().set("power_on");
+        new TalkCommand().execute(ctx, List.of("man"));
+        assertThat(io.allOutput()).contains("lights are back").doesNotContain("Hello there");
+    }
+}