"""GET /api/moments — 员工朋友圈帖子列表(create_time desc)+账号头部。全本地。

对齐云客员工聊天窗口「朋友圈」tab:顶部账号资料卡(昵称/头像/别名)+
帖子流(新→旧)。读镜像 ``moments_post`` 表(WeChat-only,所属员工由
``wechat_id`` 标识),头部信息查 ``wechat_account``。

员工微信号不存在时不 404——返回 ``header`` 全 ``None`` + 空 ``items``,
前端资料卡自行兜底(云客侧同一员工必定有账号行,本地镜像可能滞后)。
"""
from __future__ import annotations

from typing import Annotated

import sqlalchemy as sa
from fastapi import APIRouter, Depends, Query
from sqlalchemy.ext.asyncio import AsyncSession

from app.api.deps import get_session
from app.api.routers.organization import account_avatar
from app.api.schemas import MomentsHeaderOut, MomentsListOut, MomentsPostOut
from app.db.models import MomentsPost, WechatAccount

router = APIRouter(prefix="/api", tags=["moments"])

SessionDep = Annotated[AsyncSession, Depends(get_session)]
PageParam = Annotated[int, Query(ge=1)]
PageSizeParam = Annotated[int, Query(ge=1, le=100)]


@router.get("/moments")
async def list_moments(
    session: SessionDep,
    wechat_id: Annotated[str, Query(min_length=1)],
    page: PageParam = 1,
    page_size: PageSizeParam = 20,
) -> MomentsListOut:
    """员工朋友圈帖子列表(``create_time`` desc,分页)+ 账号头部。

    排序 ``nullslast(create_time desc)`` + ``id`` 稳定断尾(MySQL 下 compat
    补丁剥掉 NULLS LAST,但 DESC 语义本就把 NULL 排后,等价——项目已有验证)。
    """
    account = (
        await session.execute(
            sa.select(
                WechatAccount.nick_name,
                WechatAccount.alias,
                WechatAccount.raw_json,
            ).where(WechatAccount.wx_id == wechat_id)
        )
    ).first()
    header = MomentsHeaderOut(
        nickname=account.nick_name if account else None,
        avatar=account_avatar(account.raw_json) if account else None,
        alias=account.alias if account else None,
    )

    total = (
        await session.execute(
            sa.select(sa.func.count())
            .select_from(MomentsPost)
            .where(MomentsPost.wechat_id == wechat_id)
        )
    ).scalar_one()

    rows = (
        await session.execute(
            sa.select(MomentsPost)
            .where(MomentsPost.wechat_id == wechat_id)
            .order_by(
                sa.nullslast(MomentsPost.create_time.desc()),
                MomentsPost.id.asc(),
            )
            .offset((page - 1) * page_size)
            .limit(page_size)
        )
    ).scalars().all()

    return MomentsListOut(
        wechat_id=wechat_id,
        header=header,
        total=total,
        page=page,
        page_size=page_size,
        items=[MomentsPostOut.model_validate(r) for r in rows],
    )