from fastapi import APIRouter, Query, Body, HTTPException
import random
from uuid import UUID
from .schema import Create, Update, Out, OutList
from ..models import Info
from utils.decorators import handle_exceptions_unified
from utils.time_tool import parse_time
from utils.out_base import CommonOut
from tortoise.transactions import in_transaction

app = APIRouter()


# 创建信息
@app.post("", response_model=Out, description='创建信息', summary='创建信息')
@handle_exceptions_unified()
async def post(item: Create = Body(..., description='创建数据')):
    """
    创建信息记录
    """
    res = await Info.create(**item.model_dump())
    if not res:
        raise HTTPException(status_code=400, detail='创建失败')
    return res


# 查询信息
@app.get("", response_model=OutList, description='获取信息', summary='获取信息')
@handle_exceptions_unified()
async def gets(
        id: UUID | None = Query(None, description='主键ID'),
        first_name: str | None = Query(None, description='名'),
        last_name: str | None = Query(None, description='姓'),
        birthday: str | None = Query(None, description='生日'),
        current_address: str | None = Query(None, description='街道地址'),
        city: str | None = Query(None, description='城市'),
        phone: str | None = Query(None, description='电话'),
        postal_code: str | None = Query(None, description='邮编'),
        province: str | None = Query(None, description='州全称'),
        status: bool | None = Query(None, description='状态'),
        email: str | None = Query(None, description='邮箱'),
        order_by: str | None = Query('create_time', description='排序字段',
                                     regex='^(-)?(id|first_name|last_name|city|postal_code|province|create_time|update_time)$'),
        res_count: bool = Query(False, description='是否返回总数'),
        create_time_start: str | int | None = Query(
            None, description='创建时间开始 (支持 YYYY-MM-DD / YYYY-MM-DD HH:mm:ss / 13位时间戳)'),
        create_time_end: str | int | None = Query(
            None, description='创建时间结束 (支持 YYYY-MM-DD / YYYY-MM-DD HH:mm:ss / 13位时间戳)'),
        update_time_start: str | int | None = Query(
            None, description='更新时间开始 (支持 YYYY-MM-DD / YYYY-MM-DD HH:mm:ss / 13位时间戳)'),
        update_time_end: str | int | None = Query(
            None, description='更新时间结束 (支持 YYYY-MM-DD / YYYY-MM-DD HH:mm:ss / 13位时间戳)'),
        page: int = Query(1, ge=1, description='页码'),
        limit: int = Query(10, ge=1, le=1000, description='每页数量'),
):
    """
    获取信息列表
    """
    query = Info.all()
    if id:
        query = query.filter(id=id)
    if first_name:
        query = query.filter(first_name=first_name)
    if last_name:
        query = query.filter(last_name=last_name)
    if birthday:
        query = query.filter(birthday=birthday)
    if current_address:
        query = query.filter(current_address=current_address)
    if city:
        query = query.filter(city=city)
    if phone:
        query = query.filter(phone=phone)
    if postal_code:
        query = query.filter(postal_code=postal_code)
    if province:
        query = query.filter(province=province)
    if email:
        query = query.filter(email=email)
    if status is not None:
        query = query.filter(status=status)
    if create_time_start:
        query = query.filter(create_time__gte=parse_time(create_time_start))
    if create_time_end:
        query = query.filter(create_time__lte=parse_time(
            create_time_end, is_end=True))
    if update_time_start:
        query = query.filter(update_time__gte=parse_time(update_time_start))
    if update_time_end:
        query = query.filter(update_time__lte=parse_time(
            update_time_end, is_end=True))

    if order_by:
        query = query.order_by(order_by)

    if res_count:
        count = await query.count()
    else:
        count = -1
    offset = (page - 1) * limit  # 计算偏移量
    query = query.limit(limit).offset(offset)  # 应用分页

    res = await query
    if not res:
        raise HTTPException(status_code=404, detail='信息不存在')
    num = len(res)
    return OutList(count=count, num=num, items=res)


# 更新信息
@app.put("", response_model=Out, description='更新信息', summary='更新信息')
@handle_exceptions_unified()
async def put(id: UUID = Query(..., description='主键ID'),
              item: Update = Body(..., description='更新数据'),
              ):
    """
    部分更新信息，只更新传入的非空字段
    """
    # 检查信息是否存在
    secret = await Info.get_or_none(id=id)
    if not secret:
        raise HTTPException(status_code=404, detail='信息不存在')

    # 获取要更新的字段（排除None值的字段）
    update_data = item.model_dump(exclude_unset=True)

    # 如果没有要更新的字段
    if not update_data:
        raise HTTPException(status_code=400, detail='没有要更新的字段')

    # 更新信息字段
    await secret.update_from_dict(update_data)
    await secret.save()
    return secret


# 删除信息

@app.delete("", response_model=CommonOut, description='删除信息', summary='删除信息')
@handle_exceptions_unified()
async def delete(id: UUID = Query(..., description='主键ID'),
                 ):
    """删除信息"""
    secret = await Info.get_or_none(id=id)
    if not secret:
        raise HTTPException(status_code=404, detail='信息不存在')
    await secret.delete()
    # Tortoise ORM 单个实例的 delete() 方法返回 None，而不是删除的记录数
    # 删除成功时手动返回 1，如果有异常会被装饰器捕获
    return CommonOut(count=1)


# 随机获取一条状态修改为True的记录
@app.get("/one", response_model=Out, description='随机获取一条状态修改为True的记录', summary='随机获取一条状态修改为True的记录')
@handle_exceptions_unified()
async def random_update_status():
    """
    随机获取一条状态为 False 的记录并在事务中更新为 True
    """
    async with in_transaction() as conn:
        q = Info.filter(status=False).using_db(conn)
        current_running_count = await q.count()
        if current_running_count == 0:
            raise HTTPException(status_code=404, detail='没有状态为False的记录')
        pick_index = random.choice(range(current_running_count))
        item = await q.order_by('create_time').offset(pick_index).first()
        updated = await Info.filter(id=item.id, status=False).using_db(conn).update(status=True)
        if updated == 0:
            raise HTTPException(status_code=400, detail='并发冲突，未更新')
    return item