import { readFile, writeFile, mkdir, cp, rm } from "node:fs/promises";
import { fileURLToPath } from "node:url";
import { resolve } from "node:path";
import { styles, modules } from "./manifest.mjs";
import { sectionOrder } from "../src/scripts/section-order.mjs";
import { publishSource } from "./publish-source.mjs";
export const root = fileURLToPath(new URL("../", import.meta.url));
export async function build(destination = resolve(root, "dist")) {
  const source = resolve(root, "src");
  const shell = await readFile(resolve(source, "page.html"), "utf8");
  if (shell.split("<!-- SECTIONS -->").length !== 2)
    throw new Error(
      "Page template must have exactly one section insertion point.",
    );
  const sections = await Promise.all(
    sectionOrder.map((name) =>
      readFile(resolve(source, "sections", `${name}.html`), "utf8"),
    ),
  );
  const css = await Promise.all(
    styles.map(
      async (name) =>
        `/* ${name} */\n${await readFile(resolve(source, "styles", name), "utf8")}`,
    ),
  );
  // Read all inputs before replacing generated output; authored source is never written.
  await rm(destination, { recursive: true, force: true });
  await mkdir(resolve(destination, "scripts"), { recursive: true });
  await Promise.all(
    modules.map((name) =>
      cp(
        resolve(source, "scripts", name),
        resolve(destination, "scripts", name),
      ),
    ),
  );
  await cp(resolve(root, "assets"), resolve(destination, "assets"), {
    recursive: true,
  });
  await writeFile(
    resolve(destination, "index.html"),
    shell
      .replace("<!-- SECTIONS -->", sections.join("\n"))
      .replace(
        "</head>",
        '  <link rel="describedby" type="application/json" href="source/manifest.json">\n</head>',
      ),
  );
  await writeFile(resolve(destination, "app.css"), css.join("\n"));
  await publishSource(root, destination);
  return destination;
}
if (
  process.argv[1] &&
  resolve(process.argv[1]) === fileURLToPath(import.meta.url)
) {
  build()
    .then(() =>
      console.log(
        `Built ${sectionOrder.length} sections and readable source to dist/`,
      ),
    )
    .catch((error) => {
      console.error(error);
      process.exitCode = 1;
    });
}