fix

backend/app/api/worlds.py

@@ -12,6 +12,7 @@ from fastapi import APIRouter, Depends, HTTPException
 from app.db import get_db_dep
 from app.deps import get_current_user
 from app.engine.world_builder import commit_world_builder, continue_world_builder, start_world_builder
+from app.engine.world_editor import edit_world_via_chat, reset_editor_dialogue
 from app.models import User, World
 from app.schemas import (
     WorldBuilderCommit,
@@ -19,6 +20,8 @@ from app.schemas import (
     WorldBuilderReply,
     WorldBuilderStart,
     WorldCreate,
+    WorldEditorChatReply,
+    WorldEditorChatRequest,
     WorldOut,
     WorldUpdate,
 )
@@ -159,3 +162,56 @@ async def builder_commit(
         raise HTTPException(status_code=400, detail=str(e))
     except Exception as e:
         raise HTTPException(status_code=500, detail=f"builder_commit_failed: {e}")
+
+
+
+# === World Editor (AI-assisted editing of an existing world) ===
+
+@router.post("/{world_id}/chat", response_model=WorldEditorChatReply)
+async def world_editor_chat(
+    world_id: UUID,
+    payload: WorldEditorChatRequest,
+    db: AsyncSession = Depends(get_db_dep),
+    user: User = Depends(get_current_user),
+):
+    """Chat with the AI to edit an existing world's definition.
+
+    Returns the AI's prose reply plus the proposed new definition. The
+    frontend must call PATCH /worlds/{id} to actually persist the change.
+    """
+    result = await db.execute(select(World).where(World.id == world_id))
+    world = result.scalars().first()
+    if not world:
+        raise HTTPException(status_code=404, detail="world_not_found")
+    if world.owner_id != user.id and not user.is_admin:
+        raise HTTPException(status_code=403, detail="forbidden")
+    try:
+        ai_message, new_defn, changed = await edit_world_via_chat(
+            db=db, user=user, world=world, message=payload.message,
+        )
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e))
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"world_editor_chat_failed: {e}")
+    return WorldEditorChatReply(
+        ai_message=ai_message,
+        definition=new_defn,
+        changed=changed,
+    )
+
+
+@router.post("/{world_id}/chat/reset")
+async def world_editor_chat_reset(
+    world_id: UUID,
+    db: AsyncSession = Depends(get_db_dep),
+    user: User = Depends(get_current_user),
+):
+    """Clear the cached editor dialogue for a world (start fresh)."""
+    result = await db.execute(select(World).where(World.id == world_id))
+    world = result.scalars().first()
+    if not world:
+        raise HTTPException(status_code=404, detail="world_not_found")
+    if world.owner_id != user.id and not user.is_admin:
+        raise HTTPException(status_code=403, detail="forbidden")
+    reset_editor_dialogue(world_id)
+    return {"ok": True}