module.exports = function(eleventyConfig) {
    // 1. Collection: All published editions, newest first
    eleventyConfig.addCollection("publishedEditions", function(collectionApi) {
        return collectionApi.getFilteredByGlob("content/editions/*/index.md")
            .filter(item => item.data.status === "published")
            .sort((a, b) => b.date - a.date);
    });

    // 2. Collection: The current (newest) published edition
    eleventyConfig.addCollection("currentEdition", function(collectionApi) {
        const published = collectionApi.getFilteredByGlob("content/editions/*/index.md")
            .filter(item => item.data.status === "published")
            .sort((a, b) => b.date - a.date);
        return published.length > 0 ? [published[0]] : [];
    });

    // 3. Layout aliases
    eleventyConfig.addLayoutAlias("edition", "layouts/edition.njk");
    eleventyConfig.addLayoutAlias("article", "layouts/article.njk");
    eleventyConfig.addLayoutAlias("base", "layouts/base.njk");

    // 4. Filters
    eleventyConfig.addFilter("newsDate", function(dateObj) {
        return new Date(dateObj).toLocaleDateString('en-US', {
            timeZone: 'UTC',
            weekday: 'long',
            month: 'long',
            day: 'numeric',
            year: 'numeric'
        });
    });

    eleventyConfig.addFilter("roman", function(num) {
      const lookup = {M:1000,CM:900,D:500,CD:400,C:100,XC:90,L:50,XL:40,X:10,IX:9,V:5,IV:4,I:1};
      let roman = '';
      for (let i in lookup) {
        while (num >= lookup[i]) {
          roman += i;
          num -= lookup[i];
        }
      }
      return roman;
    });

    eleventyConfig.addCollection("editions", function(collectionApi) {
      return collectionApi.getFilteredByGlob("content/editions/*/index.md");
    });

    // 5. Directory configuration (integrated into the same function)
    return {
        dir: {
            input: "content",
            includes: "../_includes",
            output: "dist"
        },
        templateFormats: ["md", "njk", "html"]
    };
};