// astro.config.mjs
// @ts-check
import { defineConfig } from "astro/config";
import mdx from "@astrojs/mdx";
import sitemap from "@astrojs/sitemap";

import rehypeSlug from "rehype-slug";
import rehypeAutolinkHeadings from "rehype-autolink-headings";

import rehypeDetailsSections from "./scripts/rehype-details-sections.mjs";
import rehypeParagraphIds from "./src/plugins/rehype-paragraph-ids.js";

const must = (name, fn) => {
  if (typeof fn !== "function") {
    throw new Error(`[astro.config] rehype plugin "${name}" is not a function (export default vs named?)`);
  }
  return fn;
};

export default defineConfig({
  output: "static",
  trailingSlash: "always",

  site: process.env.PUBLIC_SITE ?? "http://localhost:4321",

  integrations: [
    mdx(),
    sitemap({
      filter: (page) => !page.includes("/api/") && !page.endsWith("/robots.txt"),
    }),
  ],

  // ✅ Plugins appliqués AU MDX
  mdx: {
    // ✅ MDX hérite déjà de markdown.rehypePlugins
    // donc ici on ne met QUE le spécifique MDX
    rehypePlugins: [
      must("rehype-details-sections", rehypeDetailsSections),
    ],
  },

  // ✅ Plugins appliqués au Markdown non-MDX
  markdown: {
    rehypePlugins: [
      must("rehype-slug", rehypeSlug),
      [must("rehype-autolink-headings", rehypeAutolinkHeadings), { behavior: "append" }],
      must("rehype-paragraph-ids", rehypeParagraphIds),
    ],
  },
});