import fs from 'node:fs';
import { defineConfig } from 'vite';

const VERSION_FILE = new URL('./src/version.json', import.meta.url);

// src/version.json is imported by the app (baked into the bundle) and also
// published as /version.json, which running clients poll to detect new deploys.
function versionFilePlugin() {
  return {
    name: 'quartiles-version-file',
    // Dev: always serve the current file contents, uncached
    configureServer(server) {
      server.middlewares.use('/version.json', (req, res) => {
        res.setHeader('Content-Type', 'application/json');
        res.setHeader('Cache-Control', 'no-store');
        res.end(fs.readFileSync(VERSION_FILE, 'utf8'));
      });
    },
    // Build: emit dist/version.json
    generateBundle() {
      this.emitFile({
        type: 'asset',
        fileName: 'version.json',
        source: fs.readFileSync(VERSION_FILE, 'utf8')
      });
    }
  };
}

export default defineConfig({
  plugins: [versionFilePlugin()]
});