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); // Sort descending
    });

    // 2. Collection: The current (newest) published edition for the index page
    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 so you don't have to type the full path in front matter
    eleventyConfig.addLayoutAlias("edition", "layouts/edition.njk");
    eleventyConfig.addLayoutAlias("article", "layouts/article.njk");
    eleventyConfig.addLayoutAlias("base", "layouts/base.njk");

    return {
        dir: {
            input: "content",
            includes: "../_includes", // Keeps templates safely outside the content dir
            output: "dist"
        },
        templateFormats: ["md", "njk", "html"]
    };
};