// node requires
const fs = require('fs')

// webc plugin
const pluginWebc = require('@11ty/eleventy-plugin-webc')

// markdown plugin
const markdownIt = require('markdown-it')
const mdla = require('markdown-it-link-attributes')

// ~> config start
module.exports = (config) => {
  // webc
  config.addPlugin(pluginWebc, {
    components: '_includes/components/**/*.webc'
  })

  // markdown setup
  const mdOptions = {
    html: true,
    linkify: true,
  }

  const markdownLib = markdownIt(mdOptions)
    .use(mdla, {
      matcher(href, _c) {
        return href.match(/\/@\w+/)
      },
      attrs: {
        rel: 'me',
        target: '_blank',
      },
    })

  config.setLibrary('md', markdownLib)

  // add collection for pages
  config.addCollection('categories', (collection) => {

    let categories = fs.readdirSync('_content')
    categories = categories.filter(c => !c.match(/\.[^/.]{1,4}$/i))

    let _cat = {}

    categories.forEach(cat => {
      let sorted = []
      let unsorted = []

      let pages = collection.getFilteredByGlob(`_content/${cat}/*.md`)

      for (let page of pages) {
        if (page.data.sort) {
          if (sorted[page.data.sort]) {
            sorted.splice(page.data.sort, 0, page)
          } else {
            sorted[page.data.sort] = page
          }
        } else {
          unsorted.push(page)
        }
      }
      sorted = sorted.filter(p => p.data.published)

      _cat[cat] = sorted.concat(unsorted)
    })

    let _p = collection.getFilteredByGlob('_content/*.md')
    let pages = {}

    _p.forEach(p => {
      if (p.data.title != 'index') {
        pages[p.data.title] = p
      }
    })

    return { ..._cat, ...pages }
  })

  // custom filters
  config.addFilter('makeLowercase', (value) => {
    if (typeof value === 'string' || value instanceof String) {
      return value.toLowerCase()
    }
  })

  // added passthrough for global assets
  config.addPassthroughCopy('assets')

  // backend
  config.addPassthroughCopy('office')

  // added passthrough for images in their respective folders
  config.addPassthroughCopy('_content/**/images/**')

  // reutrn updated config
  return {
    htmlTemplateEngine: 'webc',
    dir: {
      input: '_content', // content
      includes: '../_includes', // templates
      output: '_site', // rendered site
      data: '../_data', // global data files
    },
  }
}