"""App 版本更新 API — OTA 热更新检测"""
from fastapi import APIRouter, Depends, Query
from sqlalchemy import select, desc
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.database import get_db
from app.models.app_version import AppVersion
from app.schemas.app_version import AppVersionResponse

router = APIRouter(prefix="/app", tags=["App版本"])


@router.get("/check-update", response_model=AppVersionResponse)
async def check_update(
    db: AsyncSession = Depends(get_db),
):
    """
    热更新检测接口（无需传参）。
    查询 app_versions 表中 is_active=true 的最新记录，
    返回最新版本号、版本代码、WGT下载地址、更新说明。
    App 端自行对比本地版本号决定是否升级。
    """
    result = await db.execute(
        select(AppVersion)
        .where(AppVersion.is_active.is_(True))
        .order_by(desc(AppVersion.version_code))
        .limit(1)
    )
    latest = result.scalar_one_or_none()

    if not latest:
        return AppVersionResponse(
            version="0",
            version_code=0,
            has_update=False,
        )

    return AppVersionResponse(
        version=latest.version,
        version_code=latest.version_code,
        has_update=bool(latest.wgt_url),  # 只有配置了 WGT 下载地址才算有效更新
        wgt_url=latest.wgt_url,
        description=latest.description,
        force_update=False,
    )


@router.get("/version", response_model=AppVersionResponse)
async def check_version(
    current: str = Query(..., description="当前 App 版本号，如 T1.0.0"),
    db: AsyncSession = Depends(get_db),
):
    """检测是否有新版本可用（服务端对比）"""
    result = await db.execute(
        select(AppVersion)
        .where(AppVersion.is_active.is_(True))
        .order_by(desc(AppVersion.version_code))
        .limit(1)
    )
    latest = result.scalar_one_or_none()

    if not latest:
        return AppVersionResponse(
            version=current,
            version_code=0,
            has_update=False,
        )

    has_update = latest.version_code > _parse_version_code(current)

    return AppVersionResponse(
        version=latest.version,
        version_code=latest.version_code,
        has_update=has_update,
        wgt_url=latest.wgt_url if has_update else None,
        description=latest.description if has_update else None,
        force_update=False,
    )


def _parse_version_code(version_str: str) -> int:
    """从版本字符串提取数字版本号"""
    import re
    nums = re.findall(r"\d+", version_str)
    if nums:
        return int("".join(nums[-3:]).ljust(3, "0")[:3])
    return 0