"""Shared web UI resources for EPUB search."""

from __future__ import annotations

from pathlib import Path

from fastapi.templating import Jinja2Templates

PACKAGE_DIR = Path(__file__).resolve().parent
TEMPLATE_DIR = PACKAGE_DIR / "templates"
STATIC_DIR = PACKAGE_DIR / "static"


def static_version(filename: str) -> int:
    """Return a cache-busting token for a static file based on its modification time."""
    try:
        return int((STATIC_DIR / filename).stat().st_mtime)
    except OSError:
        return 0


templates = Jinja2Templates(directory=TEMPLATE_DIR)
templates.env.globals["static_version"] = static_version