# File: backend/app/api/v1/endpoints/assistants.py (新建)
# Description: 助手的 API 路由

from fastapi import APIRouter, HTTPException, Depends, status
from typing import List
from app.models.pydantic_models import AssistantRead, AssistantCreate, AssistantUpdate
from app.services.assistant_service import assistant_service_instance, AssistantService

router = APIRouter()

# --- 依赖注入 AssistantService ---
def get_assistant_service() -> AssistantService:
    return assistant_service_instance

@router.post("/", response_model=AssistantRead, status_code=status.HTTP_201_CREATED)
async def create_new_assistant(
    assistant_data: AssistantCreate,
    service: AssistantService = Depends(get_assistant_service)
):
    """创建新助手"""
    return service.create_assistant(assistant_data)

@router.get("/", response_model=List[AssistantRead])
async def read_all_assistants(
    service: AssistantService = Depends(get_assistant_service)
):
    """获取所有助手列表"""
    return service.get_assistants()

@router.get("/{assistant_id}", response_model=AssistantRead)
async def read_assistant_by_id(
    assistant_id: str,
    service: AssistantService = Depends(get_assistant_service)
):
    """根据 ID 获取特定助手"""
    assistant = service.get_assistant(assistant_id)
    if not assistant:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="找不到指定的助手")
    return assistant

@router.put("/{assistant_id}", response_model=AssistantRead)
async def update_existing_assistant(
    assistant_id: str,
    assistant_data: AssistantUpdate,
    service: AssistantService = Depends(get_assistant_service)
):
    """更新指定 ID 的助手"""
    updated_assistant = service.update_assistant(assistant_id, assistant_data)
    if not updated_assistant:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="找不到指定的助手")
    return updated_assistant

@router.delete("/{assistant_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_existing_assistant(
    assistant_id: str,
    service: AssistantService = Depends(get_assistant_service)
):
    """删除指定 ID 的助手"""
    deleted = service.delete_assistant(assistant_id)
    if not deleted:
        # 根据服务层逻辑判断是找不到还是不允许删除
        assistant = service.get_assistant(assistant_id)
        if assistant and assistant_id == 'asst-default':
             raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="不允许删除默认助手")
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="找不到指定的助手")
    # 成功删除，不返回内容