/**
 * Обратная связь от пользователей («чего не хватает»).
 * Сейчас всё хранится в localStorage.
 * SUPABASE: заменить на таблицу `feedback` (insert для user, select для admin).
 */

export type FeedbackItem = {
  id: string;
  userId: string;
  username: string;
  text: string;
  createdAt: number;
  read: boolean;
};

export const FEEDBACK_KEY = "realknot-feedback-v1";

const safe = <T,>(fn: () => T, fallback: T): T => {
  try {
    return fn();
  } catch {
    return fallback;
  }
};

const newId = () => Math.random().toString(36).slice(2, 10);

/** SUPABASE: `supabase.from("feedback").select("*").order("created_at")`. */
export const listFeedback = (): FeedbackItem[] =>
  safe(() => {
    const raw = localStorage.getItem(FEEDBACK_KEY);
    const arr = raw ? (JSON.parse(raw) as FeedbackItem[]) : [];
    return arr.sort((a, b) => b.createdAt - a.createdAt);
  }, []);

const write = (list: FeedbackItem[]) =>
  safe(() => localStorage.setItem(FEEDBACK_KEY, JSON.stringify(list)), undefined);

/** SUPABASE: `supabase.from("feedback").insert({ ... })`. */
export const addFeedback = (userId: string, username: string, text: string) => {
  const item: FeedbackItem = {
    id: newId(),
    userId,
    username,
    text: text.trim(),
    createdAt: Date.now(),
    read: false,
  };
  write([item, ...listFeedback()]);
  return item;
};

export const markFeedbackRead = (id: string) => {
  write(listFeedback().map((f) => (f.id === id ? { ...f, read: true } : f)));
  return listFeedback();
};

export const removeFeedback = (id: string) => {
  write(listFeedback().filter((f) => f.id !== id));
  return listFeedback();
};

export const unreadFeedbackCount = () => listFeedback().filter((f) => !f.read).length;