const images = require("./_data/images.json");

module.exports = function (eleventyConfig) {
  // Static assets shipped verbatim to the document root.
  eleventyConfig.addPassthroughCopy("assets");
  eleventyConfig.addPassthroughCopy("robots.txt");
  eleventyConfig.addPassthroughCopy("sitemap.xml");

  // {% image "key", "alt text", 'loading="lazy" class="x"' %}
  // Emits an <img> with width/height from _data/images.json (prevents CLS).
  eleventyConfig.addShortcode("image", function (key, alt, attrs = "") {
    const img = images[key];
    if (!img) {
      throw new Error(`image shortcode: unknown key "${key}" (add it to _data/images.json)`);
    }
    const safeAlt = String(alt).replace(/"/g, "&quot;");
    const extra = attrs ? " " + attrs : "";
    return `<img src="${img.src}" width="${img.w}" height="${img.h}" alt="${safeAlt}"${extra}>`;
  });

  // Current year, for the footer (replaces the deprecated document.write pattern).
  eleventyConfig.addShortcode("year", () => `${new Date().getFullYear()}`);

  // JSON-encode a value (for safely emitting strings into JSON-LD).
  eleventyConfig.addFilter("json", (v) => JSON.stringify(v));

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