// 移动端虚拟手柄：左手方向、右手跳跃 + 道具（参考 IWBT Creator 的触屏布局）
// 左下方：← → 移动；右下方：大跳键 + 射击/下蹲 道具键 + 暂停/重生
import { setTouch, clearTouch } from './input.js';

// 持续按住型动作（通过 action 状态机驱动）
const HELD = ['left', 'right', 'jump', 'down'];

const api = {
  pause() {},
  suicide() {},
  shoot() {},
};

let visible = false;
let root = null;

function q(sel) { return document.querySelector(sel); }

function bind(btn) {
  const action = btn.dataset.touch;
  if (!action) return;
  let timer = null;

  const press = (e) => {
    e.preventDefault();
    if (btn._pid != null) return;        // 已在按住（多指防重入）
    btn._pid = e.pointerId;
    try { btn.setPointerCapture(e.pointerId); } catch (_) {}
    btn.classList.add('on');

    if (action === 'shoot') {
      // 长按连发（受玩家冷却与是否持枪限制）
      api.shoot();
      timer = setInterval(() => api.shoot(), 140);
    } else if (HELD.includes(action)) {
      setTouch(action, true);
    } else if (action === 'pause') {
      api.pause();
    } else if (action === 'suicide') {
      api.suicide();
    }
  };

  const release = (e) => {
    if (btn._pid != null && e.pointerId !== btn._pid) return;
    btn._pid = null;
    try { btn.releasePointerCapture(e.pointerId); } catch (_) {}
    btn.classList.remove('on');
    if (action === 'shoot') {
      if (timer) { clearInterval(timer); timer = null; }
    } else if (HELD.includes(action)) {
      setTouch(action, false);
    }
  };

  btn.addEventListener('pointerdown', press);
  btn.addEventListener('pointerup', release);
  btn.addEventListener('pointercancel', release);
  btn.addEventListener('lostpointercapture', release);
  btn.addEventListener('contextmenu', (e) => e.preventDefault());
}

export const Touch = {
  init(handlers) {
    Object.assign(api, handlers || {});
    root = q('#touch');
    root.querySelectorAll('[data-touch]').forEach(bind);
    // 游戏进行中禁止页面滚动/回弹
    const stage = q('#stage');
    if (stage) {
      stage.addEventListener('touchmove', (e) => { if (visible) e.preventDefault(); }, { passive: false });
      stage.addEventListener('contextmenu', (e) => { if (visible) e.preventDefault(); });
    }
  },

  show() {
    if (!root) root = q('#touch');
    if (!root) return;
    visible = true;
    root.classList.remove('hidden');
  },

  hide() {
    if (!root) root = q('#touch');
    if (!root) return;
    visible = false;
    root.classList.add('hidden');
    clearTouch();                 // 防止按键卡住
  },

  /** 反映是否持有手枪：无枪时射击键置灰 */
  setGun(has) {
    const g = q('#tc-gun');
    if (g) g.classList.toggle('off', !has);
  },
};