import { useEffect } from 'react'
import Prism from 'prismjs'
// 所有语言的prismjs 使用autoloader引入
// import 'prismjs/plugins/autoloader/prism-autoloader'
import 'prismjs/plugins/toolbar/prism-toolbar'
import 'prismjs/plugins/toolbar/prism-toolbar.min.css'
import 'prismjs/plugins/show-language/prism-show-language'
import 'prismjs/plugins/copy-to-clipboard/prism-copy-to-clipboard'
import 'prismjs/plugins/line-numbers/prism-line-numbers'
import 'prismjs/plugins/line-numbers/prism-line-numbers.css'

// mermaid图
import BLOG from '@/blog.config'
import { loadExternalResource } from '@/lib/utils'
import { useRouter } from 'next/navigation'

/**
 * @author https://github.com/txs/
 * @returns
 */
const PrismMac = () => {
  const router = useRouter()
  useEffect(() => {
    const handleDarkModeChange = () => {
      if (JSON.parse(BLOG.CODE_MAC_BAR)) {
        loadExternalResource('/css/prism-mac-style.css', 'css')
      }
      let PRISM_THEME
      let PRISM_PREVIOUS
      const themeClass = document.documentElement.className
      if (BLOG.PRISM_THEME_SWITCH) {
        if (themeClass === 'dark') {
          PRISM_THEME = BLOG.PRISM_THEME_DARK_PATH
          PRISM_PREVIOUS = BLOG.PRISM_THEME_LIGHT_PATH
          const previousTheme = document.querySelector(`link[href="${PRISM_PREVIOUS}"]`)
          if (previousTheme) {
            previousTheme.parentNode.removeChild(previousTheme)
          }
        } else {
          PRISM_THEME = BLOG.PRISM_THEME_LIGHT_PATH
          PRISM_PREVIOUS = BLOG.PRISM_THEME_DARK_PATH
          const previousTheme = document.querySelector(`link[href="${PRISM_PREVIOUS}"]`)
          if (previousTheme) {
            previousTheme.parentNode.removeChild(previousTheme)
          }
        }
        loadExternalResource(PRISM_THEME, 'css')
      } else {
        loadExternalResource(BLOG.PRISM_THEME_PREFIX_PATH, 'css')
      }
      loadExternalResource(BLOG.PRISM_JS_AUTO_LOADER, 'js').then((url) => {
        if (window?.Prism?.plugins?.autoloader) {
          window.Prism.plugins.autoloader.languages_path = BLOG.PRISM_JS_PATH
        }
        renderPrismMac()
        renderMermaid()
      })
    }
    handleDarkModeChange()

    const handleDarkModeToggle = () => {
      const currentTheme = document.documentElement.className
      handleDarkModeChange()
      document.documentElement.className = currentTheme === 'light' ? 'dark' : 'light'
    }

    const darkModeSwitchButton = document.getElementById('darkModeButton')
    darkModeSwitchButton.addEventListener('click', handleDarkModeToggle)

    return () => {
      darkModeSwitchButton.removeEventListener('click', handleDarkModeToggle)
    }
  }, [router])
  return <></>
}

/**
 * 将mermaid语言 渲染成图片
 */
const renderMermaid = async() => {
  const observer = new MutationObserver(async mutationsList => {
    for (const m of mutationsList) {
      if (m.target.className === 'notion-code language-mermaid') {
        const chart = m.target.querySelector('code').textContent
        if (chart && !m.target.querySelector('.mermaid')) {
          const mermaidChart = document.createElement('div')
          mermaidChart.className = 'mermaid'
          mermaidChart.innerHTML = chart
          m.target.appendChild(mermaidChart)
        }

        const mermaidsSvg = document.querySelectorAll('.mermaid')
        if (mermaidsSvg) {
          let needLoad = false
          for (const e of mermaidsSvg) {
            if (e?.firstChild?.nodeName !== 'svg') {
              needLoad = true
            }
          }
          if (needLoad) {
            loadExternalResource(BLOG.MERMAID_CDN, 'js').then(url => {
              // console.log('mermaid加载成功', url, mermaid)
              const mermaid = window.mermaid
              mermaid.contentLoaded()
            })
          }
        }
      }
    }
  })
  if (document.querySelector('#container-inner')) {
    observer.observe(document.querySelector('#container-inner'), { attributes: true, subtree: true })
  }
}

function renderPrismMac() {
  const container = document?.getElementById('container-inner')

  // Add line numbers
  if (BLOG.CODE_LINE_NUMBERS === 'true') {
    const codeBlocks = container?.getElementsByTagName('pre')
    if (codeBlocks) {
      Array.from(codeBlocks).forEach(item => {
        if (!item.classList.contains('line-numbers')) {
          item.classList.add('line-numbers')
          item.style.whiteSpace = 'pre-wrap'
        }
      })
    }
  }
  // 重新渲染之前检查所有的多余text

  try {
    Prism.highlightAll()
  } catch (err) {
    console.log('代码渲染', err)
  }

  const codeToolBars = container?.getElementsByClassName('code-toolbar')
  // Add pre-mac element for Mac Style UI
  if (codeToolBars) {
    Array.from(codeToolBars).forEach(item => {
      const existPreMac = item.getElementsByClassName('pre-mac')
      if (existPreMac.length < codeToolBars.length) {
        const preMac = document.createElement('div')
        preMac.classList.add('pre-mac')
        preMac.innerHTML = '<span></span><span></span><span></span>'
        item?.appendChild(preMac, item)
      }
    })
  }

  // 折叠代码行号bug
  if (BLOG.CODE_LINE_NUMBERS === 'true') {
    fixCodeLineStyle()
  }
}

/**
 * 行号样式在首次渲染或被detail折叠后行高判断错误
 * 在此手动resize计算
 */
const fixCodeLineStyle = () => {
  const observer = new MutationObserver(mutationsList => {
    for (const m of mutationsList) {
      if (m.target.nodeName === 'DETAILS') {
        const preCodes = m.target.querySelectorAll('pre.notion-code')
        for (const preCode of preCodes) {
          Prism.plugins.lineNumbers.resize(preCode)
        }
      }
    }
  })
  observer.observe(document.querySelector('#container'), { attributes: true, subtree: true })
  setTimeout(() => {
    const preCodes = document.querySelectorAll('pre.notion-code')
    for (const preCode of preCodes) {
      console.log('code', preCode)
      Prism.plugins.lineNumbers.resize(preCode)
    }
  }, 10)
}

export default PrismMac