feat: add character regeneration endpoint and integrate emotion limits for AI-generated scripts

qwen3-tts-backend/api/audiobook.py

@@ -245,6 +245,54 @@ async def create_ai_script_project(
     return _project_to_response(project)
 
 
+@router.post("/projects/{project_id}/regenerate-characters")
+async def regenerate_characters(
+    project_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    project = crud.get_audiobook_project(db, project_id, current_user.id)
+    if not project:
+        raise HTTPException(status_code=404, detail="Project not found")
+    if project.source_type != "ai_generated":
+        raise HTTPException(status_code=400, detail="Only AI-generated projects support this operation")
+    if project.status in ("analyzing", "generating"):
+        raise HTTPException(status_code=400, detail=f"Project is currently {project.status}, please wait")
+
+    cfg = project.script_config or {}
+    is_nsfw = cfg.get("nsfw_mode", False)
+
+    if is_nsfw:
+        from db.crud import can_user_use_nsfw
+        if not can_user_use_nsfw(current_user):
+            raise HTTPException(status_code=403, detail="NSFW access not granted")
+        from db.crud import get_system_setting
+        if not get_system_setting(db, "grok_api_key") or not get_system_setting(db, "grok_base_url"):
+            raise HTTPException(status_code=400, detail="Grok config not set. Please configure Grok API key first.")
+        from core.audiobook_service import generate_ai_script_nsfw
+        service_fn = generate_ai_script_nsfw
+    else:
+        from db.crud import get_system_setting
+        if not get_system_setting(db, "llm_api_key") or not get_system_setting(db, "llm_base_url") or not get_system_setting(db, "llm_model"):
+            raise HTTPException(status_code=400, detail="LLM config not set. Please configure LLM API key first.")
+        from core.audiobook_service import generate_ai_script
+        service_fn = generate_ai_script
+
+    from core.database import SessionLocal
+    user_id = current_user.id
+
+    async def run():
+        async_db = SessionLocal()
+        try:
+            db_user = crud.get_user_by_id(async_db, user_id)
+            await service_fn(project_id, db_user, async_db)
+        finally:
+            async_db.close()
+
+    asyncio.create_task(run())
+    return {"message": "Character regeneration started", "project_id": project_id}
+
+
 @router.post("/projects/{project_id}/continue-script")
 async def continue_script(
     project_id: int,