// DOM 界面：菜单 / 关卡选择 / HUD / 结算
import { LEVELS, TYPE_LABEL, TYPE_CLASS } from './levels/index.js';
import { Save } from './save.js';
import { fmtTime } from './util.js';

const $ = s => document.querySelector(s);
const $$ = s => Array.from(document.querySelectorAll(s));

const SCREENS = ['scr-title', 'scr-levels', 'scr-help', 'scr-pause', 'scr-result', 'scr-editor'];
const TABS = [
  ['all', '全部'], ['jump', '跳刺'], ['endur', '耐久'], ['boss', 'BOSS'], ['troll', '坑向'], ['custom', '自制'],
];

export const UI = {
  H: {},            // handlers
  filter: 'all',
  cur: 'scr-title',
  toastTimer: 0,

  init(handlers) {
    this.H = handlers;

    // 按钮
    $$('[data-act]').forEach(btn => {
      btn.addEventListener('click', () => {
        const a = btn.dataset.act;
        if (this.H[a]) this.H[a]();
      });
    });

    // 分类 tabs
    const tabs = $('#level-tabs');
    tabs.innerHTML = '';
    TABS.forEach(([k, label]) => {
      const b = document.createElement('button');
      b.className = 'tab' + (k === 'all' ? ' on' : '');
      b.textContent = label;
      b.onclick = () => {
        this.filter = k;
        $$('#level-tabs .tab').forEach(t => t.classList.remove('on'));
        b.classList.add('on');
        this.renderLevels();
      };
      tabs.appendChild(b);
    });
  },

  show(name) {
    SCREENS.forEach(s => $('#' + s).classList.toggle('hidden', s !== name));
    this.cur = name;
    $('#hud').classList.toggle('hidden', name !== null && name !== '');
    if (name === 'scr-levels') this.renderLevels();
  },
  showGame() {
    SCREENS.forEach(s => $('#' + s).classList.add('hidden'));
    this.cur = '';
    $('#hud').classList.remove('hidden');
  },

  renderLevels() {
    const grid = $('#level-grid');
    grid.innerHTML = '';
    const customs = Save.customs().map((l, i) => ({ ...l, index: 100 + i, no: i + 1 }));
    const all = [...LEVELS, ...customs];
    const list = all.filter(l => this.filter === 'all' ? true : l.type === this.filter);

    if (!list.length) {
      grid.innerHTML = '<div style="color:#666;padding:20px">这个分类下还没有关卡。去「自制关卡」造一个吧。</div>';
      return;
    }
    list.forEach(l => {
      const rec = Save.get(l.id);
      const card = document.createElement('div');
      card.className = 'lv-card' + (rec ? ' cleared' : '');
      const stars = '★'.repeat(l.diff || 1) + '☆'.repeat(Math.max(0, 5 - (l.diff || 1)));
      card.innerHTML = `
        <div class="idx">${l.builtin === false ? 'U' + (l.no || '') : String(l.index + 1).padStart(2, '0')}</div>
        <div class="nm">${escapeHtml(l.name || 'STAGE')}</div>
        <div class="meta">
          <span class="tag ${TYPE_CLASS[l.type] || 't-custom'}">${TYPE_LABEL[l.type] || '自制'}</span>
          <span style="color:#ffc63a">${stars}</span>
        </div>
        <div class="st">${rec ? `✔ 死亡 ${rec.deaths} · ${fmtTime(rec.time)}` : '未通关'}</div>
        ${rec ? '<div class="chk">✔</div>' : ''}
      `;
      card.onclick = () => this.H.play(l);
      grid.appendChild(card);
    });
  },

  hud({ name, deaths, ms, apples, totalApples, hasGun, save, totalSaves }) {
    $('#hud-level').textContent = name || '';
    $('#hud-deaths').textContent = 'DEATH ' + deaths;
    $('#hud-time').textContent = fmtTime(ms);
    const ap = $('#hud-apples');
    if (totalApples > 0) { ap.style.display = ''; ap.textContent = `苹果 ${apples}/${totalApples}`; }
    else ap.style.display = 'none';
    const sv = $('#hud-save');
    if (totalSaves > 0) {
      sv.style.display = '';
      sv.textContent = save > 0 ? `存档 ${save}/${totalSaves}` : `存档 0/${totalSaves}`;
      sv.classList.toggle('on', save > 0);
    } else sv.style.display = 'none';
  },

  bossBar(boss) {
    const bar = $('#boss-bar');
    if (!boss) { bar.classList.add('hidden'); return; }
    bar.classList.remove('hidden');
    $('#boss-name').textContent = boss.name;
    $('#boss-fill').style.width = Math.max(0, (boss.hp / boss.maxHp) * 100) + '%';
  },

  toast(text) {
    const el = $('#toast');
    if (!text) { el.classList.remove('show'); return; }
    if (el.textContent !== text) el.textContent = text;
    el.classList.add('show');
  },

  result({ name, ms, deaths, apples, totalApples, better, hasNext }) {
    $('#r-name').textContent = name;
    $('#r-time').textContent = fmtTime(ms);
    $('#r-death').textContent = deaths;
    $('#r-apple').textContent = totalApples ? `${apples}/${totalApples}` : '—';
    $('#r-best').textContent = better ? '★ 新纪录！' : '';
    $('#scr-result').querySelector('[data-act="next"]').style.display = hasNext ? '' : 'none';
    this.show('scr-result');
  },
};

function escapeHtml(s) {
  return String(s).replace(/[&<>"']/g, c => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c]));
}