const path = require("path");
const markdownIt = require("markdown-it");
const slugify = require("@sindresorhus/slugify");
const markdownItAnchor = require("markdown-it-anchor");
const markdownItObsidian = require("markdown-it-obsidian");
const markdownItAttrs = require("markdown-it-attrs");
const markdownItEleventyImg = require("markdown-it-eleventy-img");
const pluginRss = require("@11ty/eleventy-plugin-rss");
const embedYouTube = require("eleventy-plugin-youtube-embed");

module.exports = function(eleventyConfig) {
  eleventyConfig.addPlugin(embedYouTube);
  eleventyConfig.addPlugin(pluginRss);

  eleventyConfig.addPassthroughCopy({ "assets/css": "css" });
  eleventyConfig.addPassthroughCopy({ "assets/fonts": "fonts" });
  eleventyConfig.addPassthroughCopy({ "assets/images/*": "images" });
  eleventyConfig.addPassthroughCopy({ "assets/favicon": "/" });
  eleventyConfig.addPassthroughCopy({
    "node_modules/simpledotcss/simple.css": "css/simple.css",
  });
  eleventyConfig.addPassthroughCopy({ "src/robots.txt": "robots.txt" });

  eleventyConfig.addFilter("buildPageTitle", function(title) {
    if (this.page.url === '/') {
      return title;
    } else {
      return title + ' ⇢ Devon.LoL 😆';
    }
  });
  eleventyConfig.addFilter("stringToDate", function(value) {
    return new Date(value);
  });
  eleventyConfig.addFilter("formatDatetimeForHumans", function(value) {
    const dt = new Date(value);
    const formattedDt = new Intl.DateTimeFormat("en", {
      dateStyle: "medium",
      timeStyle: "medium",
    }).format(dt);
    return formattedDt;
  });
  eleventyConfig.addFilter("formatDateForHumans", function(value) {
    const dt = new Date(value);
    const formattedDt = new Intl.DateTimeFormat("en", {
      dateStyle: "medium",
    }).format(dt);
    return formattedDt;
  });
  eleventyConfig.addFilter("convertYouTubeURLsToEmbeds", function(value) {
    const youtubeUrlRegex = /<p>\s*(?:https?:\/\/)?(?:www\.)?(?:youtube\.com|youtu\.be)\/(?!channel\/|@)([^\s&<>"']*)\s*<\/p>/gim;
    return value.replace(youtubeUrlRegex, function(match, videoId) {
      return '<iframe width="560" height="315" src="https://www.youtube.com/embed/' + videoId + '" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>';
    });
  });


  const markdownLibrary = markdownIt()
    .use(markdownItAnchor, { slugify })
    .use(
      markdownItObsidian({
        slugifyOnPageLinks: slugify,
      })
    )
    .use(markdownItAttrs)
    .use(markdownItEleventyImg, {
      imgOptions: {
        outputDir: path.join("dist", "img"),
      },
      globalAttributes: {
        loading: "lazy",
        decoding: "async",
      },
    });
  eleventyConfig.setLibrary("md", markdownLibrary);

  return {
    dir: {
      input: "src",
      output: "dist",
    },
  };
};