/* global KEEP */

function initToggleShowToc() {
  KEEP.utils.postHelper = {
    postPageContainerDom: document.querySelector('.post-page-container'),
    toggleShowTocBtnDom: document.querySelector('.toggle-show-toc'),
    toggleShowTocIcon: document.querySelector('.toggle-show-toc i'),
    mainContentDom: document.querySelector('.main-content'),
    postToolsDom: document.querySelector('.post-tools'),
    goToCommentsDom: document.querySelector('.post-tools .go-to-comments'),

    isShowToc: false,

    initToggleToc() {
      this.toggleShowTocBtnDom &&
        this.toggleShowTocBtnDom.addEventListener('click', () => {
          this.isShowToc = !this.isShowToc
          KEEP.styleStatus.isShowToc = this.isShowToc
          KEEP.setStyleStatus()
          this.handleToggleToc(this.isShowToc)
        })
    },

    handleToggleToc(isOpen) {
      if (isOpen) {
        this.postPageContainerDom.classList.add('show-toc')
        document.body.classList.add('has-toc')
      } else {
        this.postPageContainerDom.classList.remove('show-toc')
        document.body.classList.remove('has-toc')
      }
    },

    hasToc(isOpen) {
      this.toggleShowTocBtnDom.style.display = 'flex'
      this.isShowToc = isOpen
      this.handleToggleToc(isOpen)
    },

    setPostToolsLeft() {
      const winWidth = window.innerWidth
      const mcWidth = this.mainContentDom.getBoundingClientRect().width.toFixed(0)
      let offsetX = 5

      if (winWidth <= 800) {
        offsetX = 3
      }

      this.postToolsDom.style.opacity = `1`
      this.postToolsDom.style.left = `calc((100vw - ${mcWidth}px) / 2 - ${offsetX}rem)`
    },

    initSetPostToolsLeft() {
      setTimeout(() => {
        this.setPostToolsLeft()
      }, 150)

      window.addEventListener('resize', () => {
        this.setPostToolsLeft()
      })
    },

    // go comment anchor
    goToComments() {
      if (this.goToCommentsDom) {
        const commentsAnchor = document.querySelector('#comments-anchor')
        this.goToCommentsDom.addEventListener('click', () => {
          commentsAnchor && commentsAnchor.scrollIntoView()
        })
      }
    },

    // watch comments count
    watchPostCommentsCount() {
      const commentsCountDom = this.postToolsDom.querySelector('.post-comments-count')
      const config = { attributes: true, childList: true }
      const callback = function (mutationsList) {
        mutationsList.forEach((item) => {
          if (item.type === 'childList') {
            const count = Number(item.target.innerHTML)
            if (count > 0) {
              commentsCountDom.style.display = 'flex'
              if (count > 99) {
                commentsCountDom.innerHTML = '99+'
                observer.disconnect()
              }
            }
          }
        })
      }

      const observer = new MutationObserver(callback)
      observer.observe(commentsCountDom, config)
    }
  }
  KEEP.utils.postHelper.initToggleToc()
  KEEP.utils.postHelper.initSetPostToolsLeft()
  KEEP.utils.postHelper.goToComments()
  KEEP.utils.postHelper.watchPostCommentsCount()
}

if (KEEP.theme_config.pjax.enable === true && KEEP.utils) {
  initToggleShowToc()
} else {
  window.addEventListener('DOMContentLoaded', initToggleShowToc)
}