import { atom } from 'jotai';
import { ServerStatus } from '../utils/kumaStatus';

/**
 * [Gitea #124] The homeserver's status from its Kuma status page (null: none
 * configured, not fetched yet, or Kuma unreachable — all mean "no banner"),
 * plus whether this client's own connection is currently lost.
 */
export const serverStatusAtom = atom<{
  status: ServerStatus | null;
  syncLost: boolean;
  /** When this client's connection dropped (ms), null while connected. */
  lostAt: number | null;
}>({
  status: null,
  syncLost: false,
  lostAt: null,
});

const DISMISS_KEY = 'lotus-status-banner-dismissed';
const DISMISS_MAX = 50;

const readDismissed = (): string[] => {
  try {
    const v = JSON.parse(localStorage.getItem(DISMISS_KEY) ?? '[]');
    return Array.isArray(v) ? v.filter((k): k is string => typeof k === 'string') : [];
  } catch {
    return [];
  }
};

const baseDismissedAtom = atom<string[]>(readDismissed());

/**
 * [Gitea #307] Status strips the user dismissed (by banner key), shared so
 * the security nudge knows a dismissed announcement isn't on screen.
 * Persisted to localStorage; session-only if storage is unavailable.
 */
export const statusDismissedAtom = atom(
  (get) => get(baseDismissedAtom),
  (get, set, key: string) => {
    const next = [...get(baseDismissedAtom).filter((k) => k !== key), key].slice(-DISMISS_MAX);
    try {
      localStorage.setItem(DISMISS_KEY, JSON.stringify(next));
    } catch {
      // storage unavailable — dismissed for this session only
    }
    set(baseDismissedAtom, next);
  },
);