# -*- coding = utf-8 -*-
# @Time : 2025/2/13 下午4:53
# @File : routes.py
# @Software : PyCharm
# @Author : xingc
# @Desc :
from typing import List, Literal

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

from core.base import schema as base_schema
from core.db.crud import CRUD
from core.db.engine import get_async_session
from core.db.models import User, UserFollows
from core.routers.auth.schema import LoginUser
from core.routers.auth.services import get_current_user

from . import schema

user_router = APIRouter(prefix='/user', tags=['用户模块'])


@user_router.get('/me/info', summary='用户信息（我的）', response_model=base_schema.BaseResponse[schema.User])
async def get_me_info(
        login_user: LoginUser = Depends(get_current_user),
        db_session: AsyncSession = Depends(get_async_session)
):
    db_crud = CRUD(db_session, User)
    user = await db_crud.get(filters={'user_id': login_user.user_id})
    if user is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail='用户不存在')

    return {'data': user}


@user_router.get(
    '/visit/{user_id}/info',
    summary='用户信息（访问者）',
    response_model=base_schema.BaseResponse[schema.LiteUser]
)
async def get_visit_user_info(
        user_id: int,
        login_user: LoginUser = Depends(get_current_user),
        db_session: AsyncSession = Depends(get_async_session)
):
    if user_id == login_user.user_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail='无法操作')

    db_crud = CRUD(db_session, User)
    user = await db_crud.get(filters={'user_id': user_id})
    if user is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail='访问用户不存在')
    return {'data': user}


@user_router.get(
    '/followers/all',
    summary='获取所有关注列表',
    response_model=base_schema.BaseResponse[
        base_schema.Paginated[
            List[schema.LiteUser]
        ]
    ]
)
async def get_all_followers(
        login_user: LoginUser = Depends(get_current_user),
        page: int = Query(default=1, gt=0),
        page_size: int = Query(default=15, gt=0, le=200),
        db_session: AsyncSession = Depends(get_async_session)
):
    # 组装查询条件
    conditions = [
        UserFollows.follower_id == login_user.user_id
    ]

    # 记录总数查询
    total_stmt = (
        select(func.count()).select_from(UserFollows).filter(*conditions)
    )
    total = await db_session.execute(total_stmt)

    # 分页记录查询
    stmt = (
        select(User, UserFollows)
        .join(User, UserFollows.followed_id == User.user_id)
        .where(*conditions)
        .order_by(UserFollows.created_at.desc()).limit(page_size).offset((page - 1) * page_size)
    )
    records = await db_session.execute(stmt)

    return {
        'data': {
            'list': records.scalars().all(),
            'total': total.scalar(),
            'page': page,
            'page_size': page_size,
        },
    }


@user_router.post('/follow/{user_id}/', summary='新增/取消关注用户', response_model=base_schema.BaseResponse)
async def follow_user(
        user_id: int,
        action: Literal['follower', 'unfollower'],
        login_user: LoginUser = Depends(get_current_user),
        db_session: AsyncSession = Depends(get_async_session)
):
    if user_id == login_user.user_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail='无法操作')

    db_crud = CRUD(db_session, User)
    follower_user: User | None = await db_crud.get(filters={'user_id': user_id})
    if follower_user is None:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail='被关注者不存在')

    user: User | None = await db_crud.get(filters={'user_id': login_user.user_id})

    db_crud = CRUD(db_session, UserFollows)
    record = {
        'follower_id': login_user.user_id,
        'followed_id': user.user_id,
    }
    if action == 'follower':
        await db_crud.create(data=record, filters=record)

    if action == 'unfollower':
        await db_crud.delete(filters=record)

    return {'message': 'ok'}


@user_router.post(
    '/search/',
    summary='搜索用户',
    response_model=base_schema.BaseResponse[
        base_schema.Paginated[
            List[schema.LiteUser]
        ]
    ]
)
async def search_user(
        nickname: str = Query(...),
        page_size: int = Query(default=30, gt=0, le=30),
        login_user: LoginUser = Depends(get_current_user),
        db_session: AsyncSession = Depends(get_async_session)
):
    db_crud = CRUD(db_session, User)
    users, total = await db_crud.get_paginated(
        page_size=page_size,
        filters={
            'nickname__like': nickname,
            'user_id__ne': login_user.user_id
        }
    )
    return {'data': {
        'list': users,
        'total': total,
        'page_size': page_size
    }}