import { readdirSync, readFileSync, statSync } from "node:fs";
import { join } from "node:path";
import { listFiles } from "./service-worker.mjs";

const ICONS = new Set([
  "icon-192.png",
  "icon-512.png",
  "icon-maskable-512.png",
  "apple-touch-icon.png",
]);
let files = 0,
  size = 0;
function inspect(directory) {
  for (const name of readdirSync(directory)) {
    const path = join(directory, name);
    if (statSync(path).isDirectory()) {
      inspect(path);
      continue;
    }
    // The app icons are the only images: rendered from icon.svg, small.
    if (ICONS.has(name)) {
      if (statSync(path).size > 32_000)
        throw new Error(`App icon is unexpectedly large: ${path}`);
      files++;
      size += statSync(path).size;
      continue;
    }
    if (!/\.(html|js|css|svg|webmanifest)$/.test(name))
      throw new Error(`Unexpected production asset: ${path}`);
    if (/reference|vendor|binjgb/i.test(path))
      throw new Error(`Reference tool in production: ${path}`);
    const bytes = readFileSync(path),
      text = bytes.toString("utf8");
    if (/Binjgb|_emulator_|binjgb\.wasm|\.reference\/pokecrystal/.test(text))
      throw new Error(`Reference dependency in production: ${path}`);
    if (/data:(image|audio|application\/octet-stream)[^,]*;base64,/i.test(text))
      throw new Error(`Embedded binary asset in production: ${path}`);
    files++;
    size += bytes.length;
  }
}
inspect("dist");

// The service worker precaches exactly the shell: every built file, and
// nothing that could hold game data.
const worker = readFileSync("dist/sw.js", "utf8");
const shell = JSON.parse(/const SHELL = (\[.*\]);/.exec(worker)?.[1] ?? "null");
if (!Array.isArray(shell)) throw new Error("dist/sw.js has no app shell list.");
const expected = [
  "./",
  ...listFiles("dist")
    .filter((file) => file !== "sw.js" && file !== "index.html")
    .map((file) => `./${file}`),
].sort();
if (JSON.stringify([...shell].sort()) !== JSON.stringify(expected))
  throw new Error("The service worker's shell does not match the build.");
if (shell.some((file) => /\.(gbc?|rom|sav)$|crystal-save/i.test(file)))
  throw new Error("The service worker would cache game data.");
console.log(
  `Native release verified: ${files} files (HTML, JS, CSS, SVG, manifest, service worker and ${ICONS.size} icons), ${size} bytes; no emulator, ROM, extracted binary assets or reference checkout.`,
);