import { glob } from "node:fs";
import { transform as transformJS } from "@swc/core";
import { minify as minifyHTML } from "@swc/html";
import { basename, dirname, join } from "node:path";

type Kind = "html" | "js";

function isIgnored(path: string) {
  return (
    path.startsWith("internal/go-proxmox") || basename(path).includes(".min.")
  );
}

function globAssets(extension: Kind, callback: (matches: string) => void) {
  glob(
    [`internal/**/*.${extension}`, `goutils/**/*.${extension}`],
    (err, matches) => {
      if (err) {
        console.error(err);
      }
      matches.forEach((e) => {
        if (!isIgnored(e)) {
          callback(e);
        }
      });
    },
  );
}

async function minify(filePath: string, kind: Kind): Promise<string> {
  const content = await Bun.file(filePath).text();
  if (kind === "js") {
    const out = await transformJS(content, {
      sourceMaps: false,
      isModule: false,
      minify: true,
    });
    if (!out.code) {
      return Promise.reject("out code is empty");
    }
    return out.code;
  }
  const out = await minifyHTML(content, {
    forceSetHtml5Doctype: true,
    collapseBooleanAttributes: true,
    collapseWhitespaces: "all",
    minifyCss: { lib: "lightningcss" },
    minifyJs: true,
    removeComments: true,
    removeEmptyMetadataElements: true,
  });
  if (out.errors && out.errors.length > 0) {
    const err = `html minify error for "${filePath}": ${out.errors.map((e) => e.message)}`;
    if (!out.code) {
      return Promise.reject(err);
    }
    console.error(err);
  }
  return out.code;
}

async function minifyOut(filePath: string, kind: Kind) {
  const minified = await minify(filePath, kind);

  const fnameNoExt = basename(filePath).split(".")[0]!;
  const outPath = join(dirname(filePath), `${fnameNoExt}.min.${kind}`);

  console.log(`minify ${filePath} -> ${outPath}`);
  await Bun.file(outPath).write(minified);
}

async function main() {
  const promises = new Array<Promise<void>>();
  globAssets("html", (e) => promises.push(minifyOut(e, "html")));
  globAssets("js", (e) => promises.push(minifyOut(e, "js")));
  await Promise.allSettled(promises);
}

await main();