// Desk-level helpers shared by the paper panels.

export function hash(str) {
  let h = 2166136261;
  for (let i = 0; i < str.length; i++) h = Math.imul(h ^ str.charCodeAt(i), 16777619);
  return h >>> 0;
}

// Give a paper a stable slight rotation derived from its id.
export function tilt(el, id, amp = 0.8) {
  const r = ((hash(id) % 1000) / 1000 - 0.5) * 2 * amp;
  el.style.setProperty("--rot", `${r.toFixed(2)}deg`);
}

export const $ = (root, sel) => root.querySelector(sel);

// Escape text for use inside innerHTML templates.
export const esc = (s) => String(s).replace(/[&<>"']/g, (c) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" })[c]);