import { existsSync, readFileSync } from "node:fs";
import { join } from "node:path";

const distDir = "dist";
const manifestPath = join(distDir, "manifest.json");

function fail(message) {
  console.error(message);
  process.exitCode = 1;
}

if (!existsSync(distDir)) {
  fail("Missing dist/ output directory. Run vite build first.");
} else if (!existsSync(manifestPath)) {
  fail("Missing dist/manifest.json. The built folder is not loadable as a Chrome extension.");
} else {
  const manifest = JSON.parse(readFileSync(manifestPath, "utf8"));
  const extensionEntry = manifest.side_panel?.default_path || manifest.action?.default_popup;

  if (manifest.manifest_version !== 3) {
    fail("dist/manifest.json must be a Manifest V3 extension manifest.");
  }

  if (!extensionEntry) {
    fail("dist/manifest.json is missing side_panel.default_path or action.default_popup.");
  } else if (!existsSync(join(distDir, extensionEntry))) {
    fail(`dist/${extensionEntry} does not exist.`);
  }

  if (manifest.background?.service_worker && !existsSync(join(distDir, manifest.background.service_worker))) {
    fail(`dist/${manifest.background.service_worker} does not exist.`);
  }

  for (const [size, iconPath] of Object.entries(manifest.icons || {})) {
    if (!existsSync(join(distDir, iconPath))) {
      fail(`dist/${iconPath} for ${size}px icon does not exist.`);
    }
  }
}

if (!process.exitCode) {
  console.log("dist/ is ready to load as an unpacked Chrome extension.");
}