import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import fs from "fs";
import path from "path";
import chokidar from "chokidar";

// https://vite.dev/config/

function generateIndex(postsDir, outputFile) {
  const files = fs.readdirSync(postsDir)
    .filter(f => f.endsWith(".md"));
  fs.writeFileSync(outputFile, JSON.stringify(files, null, 2));
  console.log(`Complete: index.json updated (${files.length} posts)`);
}

function generateIndexPlugin() {
  const postsDir = path.resolve("public/posts");
  const outputFile = path.resolve("public/posts/index.json"); 
  return {
    name: "generate-index-json",
    buildStart() {
      generateIndex(postsDir, outputFile);
    },
    configureServer(server) {
      const watcher = chokidar.watch(postsDir, { ignoreInitial: true });
      const update = () => {
        generateIndex(postsDir, outputFile);
        server.ws.send({
          type: "full-reload",
          path: "/posts/index.json"
        });
      };
      watcher.on("add", update);
      watcher.on("unlink", update);
      watcher.on("change", update);
      server.httpServer.on("close", () => watcher.close());
    }
  };
}

export default defineConfig({
  plugins: [react(),generateIndexPlugin()],
})