'use strict';
/* ============================================================
   NEON SURVIVORS — save.js : localStorage persistence
   Meta progression (gold, permanent upgrades, unlocks) + settings.
   ============================================================ */

const SAVE_KEY = 'neon_survivors_v1';

const DEFAULT_SAVE = {
  gold: 0,
  meta: {},                 // metaId -> rank purchased
  chars: ['kaito'],         // unlocked character ids
  flags: { boss1: false, time10: false, time15: false },
  totals: { kills: 0, gold: 0, best: 0, wins: 0, runs: 0, evos: 0, props: 0 },
  progress: { stages: ['graveyard'], bestPerStage: {}, endlessBest: 0, stageWins: {}, gradeWins: {} },
  skinOwned: {},            // 'charId:skinKey' -> 1
  skinSel: {},              // charId -> skinKey
  lbName: '',               // leaderboard display name
  daily: { date: '', best: 0 },
  ach: {},
  history: [],
  settings: {
    lang: 'vi',
    volMaster: 0.9,
    volMusic: 0.6,
    volSfx: 0.85,
    shake: true,
    dmgNum: true,
    particles: 'high',      // low | med | high
    fps: false,
    autoPause: true,
    dev: false,             // developer mode tools
    keybinds: { up: 'KeyW', down: 'KeyS', left: 'KeyA', right: 'KeyD' }
  }
};

const Store = {
  data: null,

  load() {
    this.data = JSON.parse(JSON.stringify(DEFAULT_SAVE));
    try {
      const raw = localStorage.getItem(SAVE_KEY);
      if (raw) {
        const parsed = JSON.parse(raw);
        // Deep-merge known sections so old saves survive schema additions.
        for (const sec of ['flags', 'totals', 'settings', 'progress', 'daily', 'ach']) {
          if (parsed[sec]) Object.assign(this.data[sec], parsed[sec]);
        }
        if (parsed.skinOwned) Object.assign(this.data.skinOwned, parsed.skinOwned);
        if (parsed.skinSel) Object.assign(this.data.skinSel, parsed.skinSel);
        if (!this.data.lbName && typeof parsed.lbName === 'string') this.data.lbName = parsed.lbName;
        if (Array.isArray(parsed.history)) this.data.history = parsed.history.slice(0, 20);
        if (typeof parsed.gold === 'number') this.data.gold = parsed.gold;
        if (parsed.meta && typeof parsed.meta === 'object') this.data.meta = parsed.meta;
        if (Array.isArray(parsed.chars)) this.data.chars = parsed.chars;
      }
    } catch (e) { console.warn('Save load failed', e); }
    return this.data;
  },

  save() {
    try { localStorage.setItem(SAVE_KEY, JSON.stringify(this.data)); }
    catch (e) { console.warn('Save write failed', e); }
  },

  reset() {
    this.data = JSON.parse(JSON.stringify(DEFAULT_SAVE));
    this.save();
  },

  s() { return this.data.settings; },

  addGold(n) {
    this.data.gold += n;
    this.data.totals.gold += Math.max(0, n);
    // lazy-save; frequent small writes are cheap enough here
    this.save();
  },

  spendGold(n) {
    if (this.data.gold < n) return false;
    this.data.gold -= n;
    this.save();
    return true;
  },

  rank(metaId) { return this.data.meta[metaId] || 0; },

  unlockChar(id) {
    if (!this.data.chars.includes(id)) {
      this.data.chars.push(id);
      this.save();
      return true;
    }
    return false;
  },

  charUnlocked(id) { return this.data.chars.includes(id); }
};