// input.js — 输入检测
// 只保留两种操作：单击 / 双击
// 键盘：空格=单击，回车=双击（桌面调试）

class InputDetector {
  constructor(el) {
    this.el = el;
    this.onTap = null;
    this.onDoubleTap = null;
    this.enabled = false;

    this._last  = 0;
    this._timer = null;
    this._WIN   = 300;  // ms双击判定窗口

    this._bindTouch();
    this._bindMouse();
    this._bindKeyboard();
  }

  enable()  { this.enabled = true; }
  disable() { this.enabled = false; }

  _fire(e) {
    e.preventDefault();
    if (!this.enabled) return;
    const now = Date.now();
    if (now - this._last < this._WIN) {
      // 双击
      clearTimeout(this._timer);
      this._last = 0;
      Haptic.confirm();
      SFX_UI.skip();
      dbg('[input] double-tap');
      if (this.onDoubleTap) this.onDoubleTap();
    } else {
      this._last = now;
      this._timer = setTimeout(() => {
        this._last = 0;
        Haptic.confirm();
        SFX_UI.tap();
        dbg('[input] tap');
        if (this.onTap) this.onTap();
      }, this._WIN);
    }
  }

  _bindTouch() {
    this.el.addEventListener('touchend', e => this._fire(e), { passive: false });
  }

  _bindMouse() {
    this.el.addEventListener('click', e => this._fire(e));
  }

  _bindKeyboard() {
    document.addEventListener('keydown', e => {
      if (!this.enabled) return;
      if (e.code === 'Space') {
        e.preventDefault();
        Haptic.confirm();
        SFX_UI.tap();
        dbg('[input] tap (kbd)');
        if (this.onTap) this.onTap();
      } else if (e.code === 'Enter') {
        e.preventDefault();
        Haptic.confirm();
        SFX_UI.skip();
        dbg('[input] double-tap (kbd)');
        if (this.onDoubleTap) this.onDoubleTap();
      }
    });
  }
}