# -*- coding: utf-8 -*-
"""备份与保留期清理。"""

from __future__ import annotations

import time
from pathlib import Path

from ..database import Database


def daily_backup_path(backup_dir: str | Path, stat_date: str) -> Path:
    compact = stat_date.replace("-", "")
    return Path(backup_dir) / f"app-{compact}.db"


def backup_daily(
    db: Database,
    backup_dir: str | Path,
    stat_date: str,
    *,
    logger=None,
) -> Path:
    target = daily_backup_path(backup_dir, stat_date)
    db.backup_to(target)
    if logger is not None:
        logger.info("backup.daily", path=str(target), stat_date=stat_date)
    return target


def prune_daily_backups(
    backup_dir: str | Path,
    *,
    keep_days: int,
    now: float | None = None,
) -> list[Path]:
    """只清理 ``app-YYYYMMDD.db`` 日备份，不动迁移备份。"""
    target_dir = Path(backup_dir)
    if not target_dir.is_dir():
        return []
    cutoff = (time.time() if now is None else now) - keep_days * 86400
    removed: list[Path] = []
    for path in target_dir.glob("app-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9].db"):
        try:
            if path.stat().st_mtime < cutoff:
                path.unlink()
                removed.append(path)
        except OSError:
            continue
    return removed