/**
 * Pure helpers — no DOM, no SDK, no IO. Safe to import from anywhere.
 *
 * Ported from `reachy_mini_marionette/lib/util.js`; the shape and
 * behaviour are 1:1 so on-disk move IDs / labels stay stable when a
 * user migrates from the v1 app.
 */

export const EMOJIS = [
  "🕺",
  "💃",
  "🤖",
  "✨",
  "🎵",
  "🎉",
  "🌈",
  "🔥",
  "🧠",
  "🪩",
  "👀",
  "🦾",
  "🐙",
  "🚀",
  "🌟",
  "🎭",
  "🎨",
  "🎪",
] as const;

export function newId(): string {
  return Math.random().toString(36).slice(2, 10);
}

export function pickRandomEmoji(): string {
  return EMOJIS[Math.floor(Math.random() * EMOJIS.length)]!;
}

export function fmtTime(s: number): string {
  if (!Number.isFinite(s) || s < 0) return "0:00";
  const m = Math.floor(s / 60);
  const r = Math.floor(s % 60);
  return `${m}:${String(r).padStart(2, "0")}`;
}

export function slugify(s: string): string {
  return (
    String(s)
      .toLowerCase()
      .replace(/[^a-z0-9]+/g, "-")
      .replace(/^-+|-+$/g, "")
      .slice(0, 48) || "move"
  );
}

/**
 * Next "Move N" label that doesn't collide with anything in the
 * supplied list (case-insensitive). Used both in the wizard (default
 * before the user types) and after-save (auto-name when the input is
 * blank).
 */
export function nextDefaultMoveName(existingLabels: Iterable<string>): string {
  const used = new Set(
    Array.from(existingLabels, (m) =>
      String(m || "")
        .trim()
        .toLowerCase(),
    ),
  );
  let n = used.size + 1;
  while (used.has(`move ${n}`)) n++;
  return `Move ${n}`;
}

export const sleep = (ms: number): Promise<void> =>
  new Promise((r) => setTimeout(r, ms));