"""Where the browser keeps what a cell did not name a path for."""

from __future__ import annotations

import os
import time
from pathlib import Path

# A screenshot nobody kept is not worth the disk after this long.
SCREENSHOT_TTL_SECONDS = 7 * 24 * 60 * 60


def home() -> Path:
    return Path(os.environ.get("ALBEDO_HOME") or "~/.albedo").expanduser()


def screenshots() -> Path:
    """Default screenshots go to the cache, never into the working tree."""
    return home() / "cache" / "browser-screenshots"


def prune(directory: Path, *, now: float | None = None) -> None:
    """Removes the PNGs in `directory` last written before the time-to-live."""
    cutoff = (time.time() if now is None else now) - SCREENSHOT_TTL_SECONDS
    try:
        entries = list(directory.glob("*.png"))
    except OSError:
        return
    for entry in entries:
        try:
            if entry.stat().st_mtime < cutoff:
                entry.unlink()
        except OSError:
            pass