import fs from "node:fs/promises";
import path from "node:path";
import { PROJECTS_ROOT } from "./config.js";

const SEED_PROJECT = "hello";
const SEED_FILE = "main.typ";

const SEED_CONTENT = `= Hello, typst-leaf!

Welcome to your first project. Edit this file on the left;
the preview on the right updates as you type.

== Features

- Instant preview powered by *tinymist*
- Live diagnostics and autocomplete
- A real editor in your browser

== Math

The quadratic formula:
$ x = (-b +- sqrt(b^2 - 4 a c)) / (2 a) $

== Code listing

\`\`\`typ
#let greet(name) = [Hello, *#name*!]

#greet("world")
\`\`\`
`;

export async function seedIfMissing(): Promise<void> {
  await fs.mkdir(PROJECTS_ROOT, { recursive: true });
  const projectDir = path.join(PROJECTS_ROOT, SEED_PROJECT);
  const file = path.join(projectDir, SEED_FILE);
  try {
    await fs.access(file);
  } catch {
    await fs.mkdir(projectDir, { recursive: true });
    await fs.writeFile(file, SEED_CONTENT, "utf8");
    console.log(`[seed] created ${SEED_PROJECT}/${SEED_FILE}`);
  }
}