// pnpm new <slug> ["Talk title"] — copies template/ into talks/<slug>
import { cpSync, existsSync, readFileSync, writeFileSync } from "node:fs";
import { join } from "node:path";
import { talksDir, templateDir } from "./lib.mjs";

const [slug, ...titleWords] = process.argv.slice(2);
if (!slug || !/^[a-z0-9][a-z0-9-]*$/.test(slug)) {
  console.error('Usage: pnpm new <slug> ["Talk title"]   (slug: lowercase letters, numbers, dashes)');
  process.exit(1);
}

const dir = join(talksDir, slug);
if (existsSync(dir)) {
  console.error(`talks/${slug} already exists.`);
  process.exit(1);
}

const title = titleWords.join(" ") || slug.replaceAll("-", " ").replace(/^./, (c) => c.toUpperCase());
const date = new Date().toISOString().slice(0, 10);

cpSync(templateDir, dir, { recursive: true });
const entry = join(dir, "slides.md");
writeFileSync(
  entry,
  readFileSync(entry, "utf8")
    .replaceAll("{{titleYaml}}", JSON.stringify(title))
    .replaceAll("{{title}}", title.replaceAll("&", "&amp;").replaceAll("<", "&lt;"))
    .replaceAll("{{date}}", date),
);

console.log(`Created talks/${slug}\n  pnpm dev ${slug}`);