// 本地存档：通关记录、最佳成绩、自制关卡
const KEY = 'iwbtc_fan_v1';

const blank = () => ({ cleared: {}, customs: [], audio: true });

export const Save = {
  data: blank(),

  load() {
    try {
      const s = localStorage.getItem(KEY);
      if (s) this.data = Object.assign(blank(), JSON.parse(s));
    } catch (e) { this.data = blank(); }
    return this.data;
  },
  flush() {
    try { localStorage.setItem(KEY, JSON.stringify(this.data)); } catch (e) { }
  },
  get(id) { return this.data.cleared[id] || null; },
  isCleared(id) { return !!this.data.cleared[id]; },
  /** 记录通关，返回是否刷新纪录 */
  clear(id, deaths, ms, apples) {
    const old = this.data.cleared[id];
    const rec = { deaths, time: ms, apples: apples || 0, at: Date.now() };
    let better = false;
    if (!old) { this.data.cleared[id] = rec; better = true; }
    else {
      const nd = Math.min(old.deaths, deaths);
      const nt = Math.min(old.time, ms);
      better = deaths < old.deaths || ms < old.time;
      this.data.cleared[id] = { ...old, deaths: nd, time: nt, apples: Math.max(old.apples || 0, apples || 0) };
    }
    this.flush();
    return better;
  },
  wipe() { this.data = blank(); this.flush(); },

  customs() { return this.data.customs || []; },
  addCustom(lv) {
    this.data.customs = this.data.customs || [];
    this.data.customs.push(lv);
    this.flush();
    return lv;
  },
  removeCustom(id) {
    this.data.customs = (this.data.customs || []).filter(l => l.id !== id);
    this.flush();
  },
  setAudio(on) { this.data.audio = on; this.flush(); },
};