import fs from "node:fs";
import path from "node:path";
import matter from "gray-matter";
import { marked } from "marked";
import type { Plugin } from "vite";

export default function markdownPlugin(): Plugin {
  const virtualModuleId = "virtual:projects";
  const resolvedId = "\0" + virtualModuleId;
  const projectsDir = path.resolve("src/content/projects");

  return {
    name: "vite-plugin-markdown",
    resolveId(id) {
      if (id === virtualModuleId) return resolvedId;
    },
    load(id) {
      if (id !== resolvedId) return;

      const files = fs.readdirSync(projectsDir).filter((f) => f.endsWith(".md"));
      const projects = files.map((file) => {
        const raw = fs.readFileSync(path.join(projectsDir, file), "utf-8");
        const { data, content } = matter(raw);
        const html = marked(content);
        const slug = file.replace(".md", "");
        return { slug, ...data, html };
      });

      return `export default ${JSON.stringify(projects)};`;
    },
  };
}