import syntaxHighlight from "@11ty/eleventy-plugin-syntaxhighlight";
import markdownIt from "markdown-it";
import markdownItAnchor from "markdown-it-anchor";
import { filters } from "./src/_filters/index.js";
import { postComparator, isPostPublic } from "./src/_utils/sort-posts.js";

export default function (eleventyConfig) {
  // Build ignored local post fixtures without making them Git-tracked.
  eleventyConfig.setUseGitIgnore(false);

  // 1. Static Asset Passthrough Copy
  eleventyConfig.addPassthroughCopy({ "src/assets": "assets" });

  // 2. Syntax Highlighting Plugin
  eleventyConfig.addPlugin(syntaxHighlight);

  // 3. Markdown-It Library Customization
  const markdownOptions = {
    html: true,
    breaks: false,
    linkify: true
  };

  const markdownLib = markdownIt(markdownOptions).use(markdownItAnchor, {
    permalink: markdownItAnchor.permalink.headerLink({
      safariReaderFix: true
    }),
    slugify: (s) =>
      s
        .trim()
        .toLowerCase()
        .replace(/[^a-z0-9 -]/g, "")
        .replace(/\s+/g, "-")
        .replace(/-+/g, "-")
  });

  eleventyConfig.setLibrary("md", markdownLib);

  // 4. Custom Filters (imported from modular src/_filters/index.js)
  for (const [name, fn] of Object.entries(filters)) {
    eleventyConfig.addFilter(name, fn);
  }

  // 5. Custom Collections
  // Pinned / featured prioritized, chronological blog posts collection (excludes drafts and hidden posts)
  eleventyConfig.addCollection("posts", (collectionApi) => {
    return collectionApi
      .getFilteredByGlob("src/posts/*.md")
      .filter((post) => isPostPublic(post))
      .sort(postComparator);
  });

  // Dynamic Tag List Collection across all public posts (excludes drafts and hidden posts)
  eleventyConfig.addCollection("tagList", (collectionApi) => {
    const tagSet = new Set();
    collectionApi
      .getFilteredByGlob("src/posts/*.md")
      .filter((post) => isPostPublic(post))
      .forEach((item) => {
        if ("tags" in item.data) {
          let tags = item.data.tags;
          if (typeof tags === "string") tags = [tags];
          for (const tag of tags) {
            const cleanTag = tag.replace(/^#/, "");
            tagSet.add(cleanTag);
          }
        }
      });
    return [...tagSet].sort();
  });

  // 6. Dev Server Options (dynamic port binding)
  eleventyConfig.setServerOptions({
    port: parseInt(process.env.PORT || "8080", 10)
  });

  return {
    dir: {
      input: "src",
      includes: "_includes",
      data: "_data",
      output: "_site"
    },
    templateFormats: ["njk", "md", "html"],
    htmlTemplateEngine: "njk",
    markdownTemplateEngine: "njk"
  };
}