#!/usr/bin/env node
/**
 * Build script: copies entire site/ to dist/, then inlines critical CSS in dist/index.html.
 * Uses Critters (no headless browser) so the build runs in any environment.
 * Dockerfile copies only dist/ — single source of truth for the built site.
 */

import Critters from "critters";
import fs from "fs";
import path from "path";
import { fileURLToPath } from "url";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const ROOT = path.join(__dirname);
const SITE = path.join(ROOT, "site");
const DIST = path.join(ROOT, "dist");

async function main() {
  // Copy entire site structure to dist
  if (fs.existsSync(DIST)) {
    fs.rmSync(DIST, { recursive: true });
  }
  fs.cpSync(SITE, DIST, { recursive: true });
  console.log("✓ Copied site/ → dist/");

  // Inline critical CSS in dist/index.html (Critters reads/writes relative to path)
  const indexPath = path.join(DIST, "index.html");
  let html = fs.readFileSync(indexPath, "utf8");

  const critters = new Critters({
    path: DIST,
    preload: "media",
    noscriptFallback: true,
    pruneSource: false,
    logLevel: "warn",
  });

  html = await critters.process(html);
  fs.writeFileSync(indexPath, html, "utf8");
  console.log("✓ Critical CSS inlined → dist/index.html");

  console.log("Build complete. Output: dist/");
}

main().catch((err) => {
  console.error(err);
  process.exit(1);
});