import logging

from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.ext.asyncio import AsyncSession

from ...core.dependencies import get_current_user
from ...db.session import get_session
from ...schemas.llm_config import LLMConfigCreate, LLMConfigRead
from ...schemas.user import UserInDB
from ...services.llm_config_service import LLMConfigService


logger = logging.getLogger(__name__)

router = APIRouter(prefix="/api/llm-config", tags=["LLM Configuration"])


def get_llm_config_service(session: AsyncSession = Depends(get_session)) -> LLMConfigService:
    return LLMConfigService(session)


@router.get("", response_model=LLMConfigRead)
async def read_llm_config(
    service: LLMConfigService = Depends(get_llm_config_service),
    current_user: UserInDB = Depends(get_current_user),
) -> LLMConfigRead:
    config = await service.get_config(current_user.id)
    if not config:
        logger.warning("用户 %s 尚未设置 LLM 配置", current_user.id)
        raise HTTPException(status_code=404, detail="尚未设置自定义配置")
    logger.info("用户 %s 获取 LLM 配置", current_user.id)
    return config


@router.put("", response_model=LLMConfigRead)
async def upsert_llm_config(
    payload: LLMConfigCreate,
    service: LLMConfigService = Depends(get_llm_config_service),
    current_user: UserInDB = Depends(get_current_user),
) -> LLMConfigRead:
    logger.info("用户 %s 更新 LLM 配置", current_user.id)
    return await service.upsert_config(current_user.id, payload)


@router.delete("", status_code=status.HTTP_204_NO_CONTENT)
async def delete_llm_config(
    service: LLMConfigService = Depends(get_llm_config_service),
    current_user: UserInDB = Depends(get_current_user),
) -> None:
    deleted = await service.delete_config(current_user.id)
    if not deleted:
        logger.warning("用户 %s 删除 LLM 配置失败，未找到记录", current_user.id)
        raise HTTPException(status_code=404, detail="未找到配置")
    logger.info("用户 %s 删除 LLM 配置", current_user.id)