"use client";

/**
 * comment-pill-store — the per-page "New comments (n)" pill state
 * (TASK-0094 R2).
 *
 * The pill is driven by `comment.event` frames (created / replied) that
 * arrive while the comment panel is CLOSED. The panel clears the pill when
 * it opens (a refetch shows the new comments). The store is keyed by pageId
 * (one pill per page, the page view mounts at most one). The frame's
 * `actorId` (the author) and the panel's "new" count are the same figure —
 * a created/replied frame is exactly one new comment.
 *
 * (reacted / resolved / reopened / deleted do NOT bump the pill — those are
 *  state changes on an existing thread, not a new comment; the panel
 *  refetches for them.)
 */
import { create } from "zustand";

interface CommentPillState {
  /** pageId → number of new comments since the panel was last opened. */
  byPage: Record<string, number>;
  /** A created/replied frame arrived (one new comment). */
  add: (pageId: string) => void;
  /** The panel opened → the refetch shows the new comments. */
  clear: (pageId: string) => void;
}

export const useCommentPillStore = create<CommentPillState>()((set) => ({
  byPage: {},
  add: (pageId) =>
    set((s) => ({ byPage: { ...s.byPage, [pageId]: (s.byPage[pageId] ?? 0) + 1 } })),
  clear: (pageId) =>
    set((s) => {
      if (!(pageId in s.byPage)) return s;
      const next = { ...s.byPage };
      delete next[pageId];
      return { byPage: next };
    })
}));