"""会话创建与历史查询接口"""

from typing import Annotated

from fastapi import APIRouter, Depends, Query, Request

from app.common.response import ApiResponse, success_response
from app.core.auth import get_current_user
from app.core.exceptions import BizException
from app.schemas.conversation import (
    ConversationCreated,
    ConversationDetail,
    ConversationList,
)
from app.schemas.user import CurrentUser

router = APIRouter(prefix="/conversations", tags=["Conversation"])


@router.post("")
async def create_conversation(
    request: Request, user: CurrentUser = Depends(get_current_user)
) -> ApiResponse[ConversationCreated]:
    store = request.app.state.conversation_store
    return success_response(
        ConversationCreated(conversation_id=await store.create(user.id))
    )


@router.get("")
async def list_conversations(
    request: Request,
    user: Annotated[CurrentUser, Depends(get_current_user)],
    limit: Annotated[int, Query(ge=1, le=100)] = 20,
    offset: Annotated[int, Query(ge=0)] = 0,
) -> ApiResponse[ConversationList]:
    store = request.app.state.conversation_store
    return success_response(
        ConversationList(conversations=await store.list_by_user(user.id, limit, offset))
    )


@router.get("/{conversation_id}")
async def get_conversation(
    conversation_id: str,
    request: Request,
    user: CurrentUser = Depends(get_current_user),
) -> ApiResponse[ConversationDetail]:
    store = request.app.state.conversation_store
    # 他人的会话与不存在同样返回 404
    if not await store.exists(conversation_id, user.id):
        raise BizException(404, "会话不存在或已过期")
    turns = await store.load_turns(conversation_id, None)
    return success_response(
        ConversationDetail(conversation_id=conversation_id, turns=turns)
    )