import fs from "fs";
import path from "path";
import md from "markdown-it";
import mdAnchor from "markdown-it-anchor";
import { spoiler as mdSpoiler } from "@mdit/plugin-spoiler";
import { footnote as mdFootnote } from "@mdit/plugin-footnote";
import mdLinkAttributes from "markdown-it-link-attributes";
import mdPrism from "markdown-it-prism";
import dayjs from "dayjs";
import utc from "dayjs/plugin/utc.js";
import clean from "eleventy-plugin-clean";
import toc from "eleventy-plugin-toc";
import site from "./site/_data/site.js";
import { feedPlugin as EleventyFeedPlugin } from "@11ty/eleventy-plugin-rss";
import EleventyVitePlugin from "@11ty/eleventy-plugin-vite";
import { execSync } from "child_process";
import fetch from "@11ty/eleventy-fetch";
import { XMLValidator, XMLParser } from "fast-xml-parser";
import { ViteMinifyPlugin } from "vite-plugin-minify";

dayjs.extend(utc);

export default async (config) => {
  const slugify = config.getFilter("slugify");
  const url = config.getFilter("url");
  const mdLib = md({
    html: true,
    breaks: true,
    linkify: true,
    typographer: true,
  })
    .use(mdAnchor, {
      permalink: mdAnchor.permalink.ariaHidden({
        placement: "before",
        symbol: "",
      }),
    })
    .use(mdFootnote)
    .use(mdSpoiler, {
      tag: "span",
      attrs: [["class", "aside"]],
    })
    .use(mdLinkAttributes, {
      matcher(href) {
        return href.match(/^https?:\/\//);
      },
      attrs: {
        target: "_blank",
        rel: "noopener",
      },
    })
    .use(mdPrism);
  mdLib.renderer.rules.render_footnote_anchor = (
    tokens,
    idx,
    options,
    env,
    slf,
  ) => {
    let id = slf.rules.footnote_anchor_name(tokens, idx, options, env, slf);
    if (tokens[idx].meta.subId > 0) id += `:${tokens[idx].meta.subId}`;
    /* ↩ with escape code to prevent display as Apple Emoji on iOS */
    return ` <a href="#fnref${id}" class="footnote-backref">\u21a9\uFE0E</a>`;
  };
  config.setLibrary("md", mdLib);
  config.addPassthroughCopy({
    assets: "/",
  });

  // collection from music folder
  config.addPassthroughCopy("site/music", {
    rename: (filename) => {
      const ext = path.extname(filename);
      const base = path.basename(filename, ext);
      return `${slugify(base)}${ext}`;
    },
  });
  config.addCollection("music", () => {
    const musicFiles = fs.readdirSync("./site/music/").map((filename) => {
      const ext = path.extname(filename);
      const base = path.basename(filename, ext);
      const absUrl = `/music/${slugify(base)}${ext}`;
      return {
        data: {
          title: base,
          tags: ["music"],
        },
        url: url(absUrl),
      };
    });
    return musicFiles;
  });

  config.addCollection("categories", (collectionApi) => {
    const posts = collectionApi
      .getFilteredByTag("posts")
      .filter(
        (p) => !p.data.draft || process.env.ELEVENTY_RUN_MODE !== "build",
      );

    const categories = posts.reduce((tags, post) => {
      post.data.tags
        .filter((tag) => tag !== "posts")
        .forEach((tag) => {
          const prev = tags[tag] ?? { id: Object.keys(tags).length, count: 0 };
          tags[tag] = { ...prev, count: prev.count + 1 };
        });
      return tags;
    }, {});
    return Object.fromEntries(
      Object.entries(categories).sort((a, b) => {
        return b[1].count - a[1].count;
      }),
    );
  });

  config.addCollection("webroll", fetchShaarliWebroll);

  config.addFilter("toISOString", (dateString) => {
    return new Date(dateString).toISOString();
  });
  config.addFilter("formatDate", (date, format) => {
    return dayjs(date).utc().format(format);
  });
  config.addFilter("markdown", (markdownString) => {
    return mdLib.renderInline(String(markdownString ?? "").trim());
  });

  clean.updateFileRecord("dist");

  const buildTime = new Date().toISOString().replace(/[:.-]/g, "");
  config.addGlobalData("buildTime", buildTime);

  config.addPlugin(EleventyFeedPlugin, {
    type: "atom", // "atom", ""rss", or "json"
    outputPath: "/feed.xml",
    collection: {
      name: "posts", // iterate over `collections.posts`
      limit: 0, // 0 means no limit
    },
    metadata: {
      language: "en",
      title: site.title,
      subtitle: site.description,
      base: site.baseUrl,
      author: {
        name: "Joshua Seigler",
        // email: "", // Optional
      },
    },
    stylesheet: "/simple-atom.xslt",
  });

  config.addPlugin(EleventyVitePlugin, {
    viteOptions: {
      server: {
        port: 8080
      },
      build: {
        mode: 'production',
        sourcemap: true,
      },
      plugins: [
        ViteMinifyPlugin({})
      ]
    }
  });

  config.addPlugin(toc);

  config.on("eleventy.after", () => {
    execSync(`npx pagefind --site dist --glob \"**/*.html\"`, {
      encoding: "utf-8",
    });
  });

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

async function fetchShaarliWebroll() {
  const url = "https://links.apps.seigler.net/feed/atom?&searchtags=%24webroll";
  const urlTextContent = await fetch(url, { duration: "30s", type: "text" });
  const validation = XMLValidator.validate(urlTextContent);
  let feedContent;
  if (validation === true) {
    feedContent = new XMLParser({
      ignoreAttributes: false,
    }).parse(urlTextContent).feed.entry;
  } else {
    throw new Error(`Invalid XML from webroll feed. Reason: ${validation.err.msg}`);
  }
  const entries = feedContent.map(entry => {
    return {
      url: entry.link['@_href'],
      data: {
        title: entry.title,
        date: new Date(entry.published),
        description: entry.content['#text'].split('\n<br>&#8212; <a href="https://links.apps.seigler.net/')[0],
        tags: entry.category.map(category => category['@_label']).filter(category => category !== '$webroll'),
      }
    }
  });
  return entries;
}