import { useGlobal } from '@/lib/global'
import throttle from 'lodash.throttle'
import Link from 'next/link'
import { useCallback, useEffect, useRef, useState } from 'react'
import CategoryGroup from './CategoryGroup'
import Collapse from './Collapse'
import Logo from './Logo'
import MenuButtonGroup from './MenuButtonGroup'
import SearchDrawer from './SearchDrawer'
import TagGroups from './TagGroups'
import CONFIG_NEXT from '../config_next'

let windowTop = 0

/**
 * 顶部导航
 * @param {*} param0
 * @returns
 */
const TopNav = (props) => {
  const { tags, currentTag, categories, currentCategory } = props
  const { locale } = useGlobal()
  const searchDrawer = useRef()

  const scrollTrigger = useCallback(throttle(() => {
    const scrollS = window.scrollY
    if (scrollS >= windowTop && scrollS > 10) {
      const nav = document.querySelector('#sticky-nav')
      nav && nav.classList.replace('top-0', '-top-40')
      windowTop = scrollS
    } else {
      const nav = document.querySelector('#sticky-nav')
      nav && nav.classList.replace('-top-40', 'top-0')
      windowTop = scrollS
    }
  }, 200), [])

  // 监听滚动
  useEffect(() => {
    if (CONFIG_NEXT.NAV_TYPE === 'autoCollapse') {
      scrollTrigger()
      window.addEventListener('scroll', scrollTrigger)
    }
    return () => {
      CONFIG_NEXT.NAV_TYPE === 'autoCollapse' && window.removeEventListener('scroll', scrollTrigger)
    }
  }, [])

  const [isOpen, changeShow] = useState(false)

  const toggleMenuOpen = () => {
    changeShow(!isOpen)
  }

  const searchDrawerSlot = <>
    { categories && (
        <section className='mt-8'>
          <div className='text-sm flex flex-nowrap justify-between font-light px-2'>
            <div className='text-gray-600 dark:text-gray-200'><i className='mr-2 fas fa-th-list' />{locale.COMMON.CATEGORY}</div>
            <Link href={'/category'} passHref>
              <a className='mb-3 text-gray-400 hover:text-black dark:text-gray-400 dark:hover:text-white hover:underline cursor-pointer'>
                {locale.COMMON.MORE} <i className='fas fa-angle-double-right' />
              </a>
            </Link>
          </div>
          <CategoryGroup currentCategory={currentCategory} categories={categories} />
        </section>
    ) }

    { tags && (
        <section className='mt-4'>
          <div className='text-sm py-2 px-2 flex flex-nowrap justify-between font-light dark:text-gray-200'>
            <div className='text-gray-600 dark:text-gray-200'><i className='mr-2 fas fa-tag'/>{locale.COMMON.TAGS}</div>
            <Link href={'/tag'} passHref>
              <a className='text-gray-400 hover:text-black  dark:hover:text-white hover:underline cursor-pointer'>
                {locale.COMMON.MORE} <i className='fas fa-angle-double-right'/>
              </a>
            </Link>
          </div>
          <div className='p-2'>
            <TagGroups tags={tags} currentTag={currentTag} />
          </div>
        </section>
    ) }
    </>

  return (<div id='top-nav' className='z-40 block lg:hidden'>
    <SearchDrawer cRef={searchDrawer} slot={searchDrawerSlot}/>

    {/* 导航栏 */}
    <div id='sticky-nav' className={`${CONFIG_NEXT.NAV_TYPE !== 'normal' ? 'fixed' : ''} lg:relative w-full top-0 z-20 transform duration-500`}>
      <div className='w-full flex justify-between items-center p-4 bg-black text-white'>
        {/* 左侧LOGO 标题 */}
        <div className='flex flex-none flex-grow-0'>
          <div onClick={toggleMenuOpen} className='w-8 cursor-pointer'>
          { isOpen ? <i className='fas fa-times'/> : <i className='fas fa-bars'/> }
          </div>
        </div>

        <div className='flex'>
         <Logo {...props}/>
        </div>

        {/* 右侧功能 */}
        <div className='mr-1 flex justify-end items-center text-sm space-x-4 font-serif dark:text-gray-200'>
          <div className="cursor-pointer block lg:hidden" onClick={() => { searchDrawer?.current?.show() }}>
            <i className="mr-2 fas fa-search" />{locale.NAV.SEARCH}
          </div>
        </div>
      </div>

      <Collapse type='vertical' isOpen={isOpen}>
        <div className='bg-white py-1 px-5'>
          <MenuButtonGroup {...props} from='top'/>
          </div>
      </Collapse>
    </div>

  </div>)
}

export default TopNav
