import { DateTime } from "luxon";
import fs from "fs";
import pluginNavigation from "@11ty/eleventy-navigation";
import pluginRss from "@11ty/eleventy-plugin-rss";
import pluginSyntaxHighlight from "@11ty/eleventy-plugin-syntaxhighlight";
import pluginAncestry from "@tigersway/eleventy-plugin-ancestry";
import metagen from "eleventy-plugin-metagen";
import pluginTOC from "eleventy-plugin-nesting-toc";
import markdownIt from "markdown-it";
import markdownItAnchor from "markdown-it-anchor";
import markdownItPlantUML from "markdown-it-plantuml";
export default function (eleventyConfig) {
  eleventyConfig.addPlugin(pluginNavigation);
  eleventyConfig.addPlugin(pluginRss);
  eleventyConfig.addPlugin(pluginSyntaxHighlight);
  eleventyConfig.addPlugin(pluginAncestry);
  eleventyConfig.addPlugin(metagen);
  eleventyConfig.addPlugin(pluginTOC, {
    tags: ["h1", "h2", "h3"],
  });

  eleventyConfig.setDataDeepMerge(true);

  eleventyConfig.addLayoutAlias("post", "layouts/post.njk");

  eleventyConfig.addFilter("readableDate", (dateObj) => {
    return DateTime.fromJSDate(dateObj, { zone: "utc" }).toFormat(
      "dd LLL yyyy",
    );
  });

  // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#valid-date-string
  eleventyConfig.addFilter("htmlDateString", (dateObj) => {
    return DateTime.fromJSDate(dateObj, { zone: "utc" }).toFormat(
      "yyyy-LL-dd",
    );
  });

  // Remove trailing # in automatic generated toc, because of
  // anchors added at the end of the titles.
  eleventyConfig.addFilter("stripHash", (toc) => {
    return toc.replace(/ #\<\/a\>/g, "</a>");
  });

  // Get the first `n` elements of a collection.
  eleventyConfig.addFilter("head", (array, n) => {
    if (n < 0) {
      return array.slice(n);
    }

    return array.slice(0, n);
  });

  // Get the lowest in a list of numbers.
  eleventyConfig.addFilter("min", (...numbers) => {
    return Math.min.apply(null, numbers);
  });

  eleventyConfig.addPassthroughCopy("img");
  eleventyConfig.addPassthroughCopy("css");
  eleventyConfig.addPassthroughCopy("js");

  // Redirects (for Cloudflare)
  eleventyConfig.addPassthroughCopy({ _redirects: "_redirects" });

  /* Markdown Overrides */
  let markdownLibrary = markdownIt({
    html: true,
    breaks: false,
    linkify: true,
  })
    .use(markdownItAnchor, {
      permalink: true,
      permalinkClass: "direct-link",
      permalinkSymbol: "#",
    })
    .use(markdownItPlantUML, {});
  eleventyConfig.setLibrary("md", markdownLibrary);

  // Browsersync Overrides
  eleventyConfig.setBrowserSyncConfig({
    callbacks: {
      ready: function (err, browserSync) {
        const content_404 = fs.readFileSync("_dist/404.html");

        browserSync.addMiddleware("*", (req, res) => {
          // Provides the 404 content without redirect.
          res.write(content_404);
          res.end();
        });
      },
    },
    ui: false,
    ghostMode: false,
  });

  return {
    templateFormats: ["md", "njk", "html", "liquid", "11ty.js"],

    // If your site lives in a different subdirectory, change this.
    // Leading or trailing slashes are all normalized away, so don't worry about those.

    // If you don't have a subdirectory, use "" or "/" (they do the same thing)
    // This is only used for link URLs (it does not affect your file structure)
    // Best paired with the `url` filter: https://www.11ty.dev/docs/filters/url/

    // You can also pass this in on the command line using `--pathprefix`
    // pathPrefix: "/",

    markdownTemplateEngine: "liquid",
    htmlTemplateEngine: "njk",
    dataTemplateEngine: "njk",

    // These are all optional, defaults are shown:
    dir: {
      input: ".",
      includes: "_includes",
      data: "_data",
      output: "_dist",
    },
  };
}