// Buddy "presence" taxonomy. Presence is BEHAVIORAL, not just time-decay:
//   online  — authored something (post / reply / repost) within the window
//   idle    — only passive activity (likes, follows, …) within the window
//   offline — no activity at all within the window
// i.e. "are they at the keyboard creating, just lurking, or gone?"

// Collections that count as actively-present authoring. Replies share the
// `app.bsky.feed.post` collection with posts, so they're covered too.
const ACTIVE = new Set([
  'app.bsky.feed.post',
  'app.bsky.feed.repost',
  'app.bsky.feed.threadgate',
  'app.bsky.feed.postgate',
]);

export const isActiveAction = (collection) => ACTIVE.has(collection);

// `lastActive` = last authoring action; `lastSeen` = last action of any kind.
export function stateFor({ lastActive, lastSeen }, windowMs) {
  const now = Date.now();
  if (lastActive && now - lastActive <= windowMs) return 'online';
  if (lastSeen && now - lastSeen <= windowMs) return 'idle';
  return 'offline';
}

const ACTION_VERB = {
  'app.bsky.feed.post': 'posted',
  'app.bsky.feed.like': 'liked a post',
  'app.bsky.feed.repost': 'reposted',
  'app.bsky.graph.follow': 'followed someone',
  'app.bsky.graph.block': 'blocked someone',
  'app.bsky.graph.listitem': 'edited a list',
  'app.bsky.actor.profile': 'updated their profile',
  'app.bsky.feed.threadgate': 'posted',
  'app.bsky.feed.postgate': 'posted',
};

export const verbFor = (collection) => ACTION_VERB[collection] || 'active';