const ACTOR = require("./actor")

module.exports = function(eleventyConfig) {
  // I'm .gitignoring my content for now, so 11ty should not ignore that
  eleventyConfig.setUseGitIgnore(false)

  // Filters are in a separate function to try and keep this config less cluttered
  addFilters(eleventyConfig)
  // same with shortcodes
  addShortcodes(eleventyConfig)
  // and collections
  addCollections(eleventyConfig)

  // add the actor data, accessible globally
  eleventyConfig.addGlobalData("ACTOR", ACTOR);

  // TODO: assets?
  // files to passthrough copy
  eleventyConfig.addPassthroughCopy({"img":"assets/img"})
  eleventyConfig.addPassthroughCopy({"js":"assets/js"})
  eleventyConfig.addPassthroughCopy("css")
  eleventyConfig.addPassthroughCopy("CNAME")

  // plugins
  eleventyConfig.addPlugin(require("@11ty/eleventy-plugin-rss"))
  const { EleventyHtmlBasePlugin } = require("@11ty/eleventy")
  eleventyConfig.addPlugin(EleventyHtmlBasePlugin)

  // Return your Object options:
  return {
    dir: {
      input: "_content",
      output: "_site"
    },
    htmlTemplateEngine: "njk",
    templateFormats: ["md","html","njk"]
  }
}

function addCollections(eleventyConfig) {
  eleventyConfig.addCollection("feed", function(collectionApi) {
    return collectionApi.getAllSorted().reverse().filter(item => {
      if(!item.data.published) return false
      return item.filePathStem.startsWith('/posts/')
    }).map(item => {
      item.data.author = ACTOR
      return item
    }).sort((a, b) => new Date(b.published).getTime() - new Date(a.published).getTime())
  })
}

function addShortcodes(eleventyConfig) {
  eleventyConfig.addNunjucksShortcode("getVar", function(varString){ return this.ctx[varString] })
  eleventyConfig.addShortcode('renderlayoutblock', function(name){ return (this.page.layoutblock || {})[name] || '' })
  eleventyConfig.addPairedShortcode('layoutblock', function(content, name) {
    if (!this.page.layoutblock) this.page.layoutblock = {}
    this.page.layoutblock[name] = content
    return ''
  })
}

function addFilters(eleventyConfig) {
  eleventyConfig.addFilter("formatDate", formatDateFilter)
  eleventyConfig.addFilter("dateISOString", dateISOStringFilter)
  eleventyConfig.addFilter("concat", (value, other) => value + '' + other)
  eleventyConfig.addNunjucksAsyncFilter("await", (promise) => promise.then(res => callback(null, res)).catch(err => callback(err)))
}

// default date formatting
function formatDateFilter(value) { 
  try{
    const date = new Date(value)
    if(date) return date.toISOString().replace('T', ' ').slice(0, -5)
    else throw 'Unrecognized data format'
  }
  catch(e) {
    console.error(`Could not convert "${value}"`, e)
    return value;
  }
}

// dates as iso string
function dateISOStringFilter(value) { 
  try{
    const date = new Date(value)
    if(date) return date.toISOString()
    else throw 'Unrecognized data format'
  }
  catch(e) {
    console.error(`Could not convert "${value}"`, e)
    return value;
  }
}