KEEP.initHeaderShrink = () => {
  KEEP.utils.headerShrink = {

    pageTemplateDom: document.querySelector('.page-main-content'),
    headerDom: document.querySelector('.header-wrapper'),
    isHeaderShrink: false,
    isShowHeaderDrawer: false,

    init() {
      this.headerHeight = this.headerDom.getBoundingClientRect().height;
    },

    headerShrink() {

      const scrollTop = document.body.scrollTop || document.documentElement.scrollTop;

      if (!this.isHeaderShrink && scrollTop > this.headerHeight) {
        this.isHeaderShrink = true;
        this.headerDom.classList.add('header-wrapper-shrink');
        this.pageTemplateDom.classList.add('page-main-content-top-shrink');
      } else if (this.isHeaderShrink && scrollTop <= this.headerHeight) {
        this.isHeaderShrink = false;
        this.headerDom.classList.remove('header-wrapper-shrink');
        this.pageTemplateDom.classList.remove('page-main-content-top-shrink');
      }

    },

    initMenuBarButton() {
      document.querySelector('.menu-bar').addEventListener('click', () => {
        this.isShowHeaderDrawer = !this.isShowHeaderDrawer;
        document.body.style.overflow = this.isShowHeaderDrawer ? 'hidden' : 'auto';
        this.headerDom.classList.toggle('header-drawer-show');
      });
    },

    initWindowMask() {
      document.querySelector('.window-mask').addEventListener('click', () => {
        this.isShowHeaderDrawer = !this.isShowHeaderDrawer;
        document.body.style.overflow = this.isShowHeaderDrawer ? 'hidden' : 'auto';
        this.headerDom.classList.toggle('header-drawer-show');
      });
    },
  }
  KEEP.utils.headerShrink.init();
  KEEP.utils.headerShrink.initMenuBarButton();
  KEEP.utils.headerShrink.initWindowMask();
}