"""Shared page/per_page parsing (Chapter 11: consistent across every
Grid.js-backed endpoint)."""
from __future__ import annotations

from flask import Request

DEFAULT_PER_PAGE = 20
MAX_PER_PAGE = 100


def parse_pagination(request: Request) -> tuple[int, int]:
    page = max(1, request.args.get("page", 1, type=int))
    per_page = request.args.get("per_page", DEFAULT_PER_PAGE, type=int)
    return page, max(1, min(per_page, MAX_PER_PAGE))