import { build } from "esbuild";
import { copyFileSync, mkdirSync, rmSync } from "node:fs";
import { createRequire } from "node:module";

// slopbox's own bundles: the terminal pane (xterm + its fit addon) and the Shell tab's
// bash interpreter (bashkit). Both used to live in @nibling/kernel's build; they moved
// here with the page, since nothing in the runtime package itself depends on them.
// dist/demo/ (not plain dist/) on purpose: slopbox.js and the shell test still say
// "/dist/demo/terminal.js" etc, unchanged from when these bundles lived in the
// runtime's own dist/demo/. Keeping the same shape here means those files needed no edits.
const DIST = "dist/demo";
const common = { bundle: true, target: "es2022", minify: true };

rmSync(DIST, { recursive: true, force: true });

await Promise.all([
  // The terminal pane. The stylesheet loads as text so the bundle is one file that
  // injects its own CSS (xterm writes runtime CSS into <style> elements it creates, so
  // it can't be a plain <link>).
  build({
    ...common,
    entryPoints: ["terminal.js"],
    format: "esm",
    outfile: `${DIST}/terminal.js`,
    loader: { ".css": "text" },
  }),
  // The Shell tab's bash interpreter. Lazy-loaded (slopbox.js imports it only once the
  // tab is first chosen), so it is its own bundle rather than folded into slopbox.js.
  // bashkit's wasm binary ships alongside it, fetched relative to the bundle's own URL
  // (`new URL("./bashkit.wasm", import.meta.url)` in shell.js).
  build({
    ...common,
    entryPoints: ["shell.js"],
    format: "esm",
    outfile: `${DIST}/shell.js`,
  }),
  // The npm gateways this build installs through (D23), named as a repo names its knot: a
  // DID or a hostname, resolved at boot to its #nibling_npm endpoint, so a gateway's operator
  // can move it without a rebuild. NIB_NPM_GATEWAYS is space-separated; unset is none, and
  // every install goes straight to the registry.
  build({
    ...common,
    stdin: {
      contents: [
        'import { gatewaySources, resolveGateways } from "@nibling/npm-gateway/resolve";',
        `export const NAMES = ${JSON.stringify((process.env.NIB_NPM_GATEWAYS ?? "").split(/\s+/).filter(Boolean))};`,
        "export const resolve = () => resolveGateways(NAMES);",
        "export const sources = () => gatewaySources(NAMES);",
      ].join("\n"),
      resolveDir: ".",
      loader: "js",
    },
    format: "esm",
    outfile: `${DIST}/npm-gateways.js`,
  }),
]);
mkdirSync(DIST, { recursive: true });
copyFileSync(
  createRequire(import.meta.url).resolve("@everruns/bashkit-wasm/bashkit_wasm_bg.wasm"),
  `${DIST}/bashkit.wasm`,
);
console.log(`built ${DIST}/{terminal,shell,npm-gateways}.js, ${DIST}/bashkit.wasm`);