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// This script bundles `esm/es2019/ef.js`, with variants.
// The resulted files can be found at `dist/`. This command also copies
// top-level `LICENSE` file into `dist/` for minified bundles. The result
// files are archived and saved as `bundle.zip`.
//
// This script reads JS files tsc emits, as Bun bundler does not perform
// any transform.

import chalk from "chalk";
import { mkdir } from "node:fs/promises";
import { basename, relative } from "node:path";
import JsZip from "jszip";

import { bytesToString } from "./_filesize.js";
import { getNetworkFilesize } from "./print-filesize.js";

import { version } from "../package.json";
import HEADER from "../HEADER.txt";

const rootDir = new URL("../", import.meta.url);
const outputDir = new URL("dist/", rootDir);
const jsDir = new URL("esm/es2019/", rootDir);

interface BundleOptions {
  minify?: boolean;

  header?: boolean;
}

export async function bundle({
  minify = false,
  header = false,
}: BundleOptions): Promise<Uint8Array> {
  // ESBuild can both transform and bundle in single step but unnecessarily changes
  // syntax too much. (e.g. `class Foo {}` -> `var Foo = class {}`)
  const result = await Bun.build({
    entrypoints: [new URL("ef.js", jsDir).pathname],
    format: "esm",
    minify,
  });

  const [file] = result.outputs;
  if (!file) {
    throw new Error("`Bun.build` returned zero-length array for `outputs`");
  }

  if (result.outputs.length > 1) {
    throw new Error(
      "Expected a single JS file built, but recieved " +
        result.outputs.length +
        " files",
    );
  }

  if (!header) {
    return new Uint8Array(await file.arrayBuffer());
  }

  const enc = new TextEncoder();

  return enc.encode(HEADER + (await file.text()));
}

function humanBytes(bytes: number): string {
  const label = bytesToString(bytes);

  if (bytes >= 10_000) {
    return chalk.bold(chalk.red(label));
  }

  if (bytes >= 5_000) {
    return chalk.yellow(label);
  }

  return chalk.blue(label);
}

interface BundledFile {
  path: string;
  content: Uint8Array;
}

async function bundleAndWrite(
  outName: string,
  opts: BundleOptions,
): Promise<BundledFile> {
  console.error(chalk.gray(`Bundling "%s"...`), outName);

  const content = await bundle(opts);

  const outPath = relative(process.cwd(), new URL(outName, outputDir).pathname);

  console.error(chalk.gray(`Writing to "%s"...`), outPath);

  await Bun.write(outPath, content);

  const size = getNetworkFilesize(content);

  console.error(
    chalk.white(`%s: written %s (gzip: %s)`),
    outName,
    humanBytes(size.raw),
    humanBytes(size.gzip),
  );

  return {
    path: outPath,
    content,
  };
}

if (import.meta.main) {
  await mkdir(outputDir, { recursive: true });

  const files: BundledFile[] = [];

  for (const minify of [true, false]) {
    for (const header of [true, false]) {
      const modifier = [minify ? "m" : "", header ? "h" : ""].join("");

      files.push(
        await bundleAndWrite(`ef-${version}${modifier}.js`, {
          header,
          minify,
        }),
      );
    }
  }

  const licenseSrc = new URL("LICENSE", rootDir);
  const licenseDst = new URL("LICENSE", outputDir);

  console.error(
    chalk.gray(`Copying "%s" to "%s"...`),
    relative(process.cwd(), licenseSrc.pathname),
    relative(process.cwd(), licenseDst.pathname),
  );

  const licenseText = await Bun.file(licenseSrc);

  await Bun.write(licenseDst, licenseText);

  console.error(chalk.white("LICENSE: copied"));

  const zip = new JsZip();

  const folder = zip.folder("ef")!;

  folder.file("LICENSE", await licenseText.arrayBuffer());

  for (const file of files) {
    folder.file(basename(file.path), file.content);
  }

  const zipFile = await zip.generateAsync({ type: "uint8array" });

  await Bun.write(new URL("bundle.zip", rootDir), zipFile);
}