export class LiveChatService {
  static instance = null;
  initialized = false;

  constructor() {
    this.initLiveChat();
  }

  static getInstance() {
    if (!LiveChatService.instance) {
      LiveChatService.instance = new LiveChatService();
    }
    return LiveChatService.instance;
  }

  initLiveChat() {
    if (this.initialized) return;

    // #ifdef H5
    window.__lc = window.__lc || {};
    window.__lc.license = 18945964;

    (function (n, t, c) {
      function i(n) {
        return e._h ? e._h.apply(null, n) : e._q.push(n);
      }
      var e = {
        _q: [],
        _h: null,
        _v: "2.0",
        on: function () {
          i(["on", c.call(arguments)]);
        },
        once: function () {
          i(["once", c.call(arguments)]);
        },
        off: function () {
          i(["off", c.call(arguments)]);
        },
        get: function () {
          if (!e._h)
            throw new Error("[LiveChatWidget] You can't use getters before load.");
          return i(["get", c.call(arguments)]);
        },
        call: function () {
          i(["call", c.call(arguments)]);
        },
        init: function () {
          var n = t.createElement("script");
          n.async = !0;
          n.type = "text/javascript";
          n.src = "https://cdn.livechatinc.com/tracking.js";
          t.head.appendChild(n);
        },
      };
      !n.__lc.asyncInit && e.init();
      n.LiveChatWidget = n.LiveChatWidget || e;
    })(window, document, [].slice);
    // #endif

    this.initialized = true;
  }

  setLanguage(lang) {
    // #ifdef H5
    if (window.LiveChatWidget) {
      if (lang === 'cn') {
        window.LiveChatWidget.call('set_language', 'zh_CN');
      } else {
        window.LiveChatWidget.call('set_language', 'en');
      }
    }
    // #endif
  }

  adjustPosition(footerHeight) {
    // #ifdef H5
    if (window.innerWidth > 768) {
      const launcher = document.getElementById('chat-widget-launcher');
      const widget = document.getElementById('chat-widget-container');

      if (launcher) {
        launcher.style.bottom = `${footerHeight}px`;
      }
      if (widget) {
        widget.style.bottom = `${footerHeight}px`;
      }
    }
    // #endif
  }
}

export default LiveChatService.getInstance();