// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import type * as Api from './api/api.js';

// eslint-disable-next-line @typescript-eslint/ban-ts-comment
// @ts-ignore 'process' is not available when type-checking against browser types.
export const IS_NODE = typeof (process as unknown) !== 'undefined' && process.versions?.node !== null;

export const IS_BROWSER =
    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
    // @ts-ignore 'window' is not available when type-checking against node.js types.
    typeof window !== 'undefined' || (typeof self !== 'undefined' && typeof self.postMessage === 'function');

export const HOST_RUNTIME = await (async(): Promise<Api.HostRuntime.HostRuntime> => {
  // Check IS_BROWSER first: in some embedder environments, both IS_NODE
  // and IS_BROWSER can be true because `process` is available in renderer
  // contexts. The browser runtime is always correct when browser APIs
  // (window/self) are available; the Node.js runtime should only be used in
  // pure Node.js environments where those APIs don't exist.
  if (IS_BROWSER) {
    return (await import('./browser/browser.js')).HostRuntime.HOST_RUNTIME;
  }

  if (IS_NODE) {
    return (await import('./node/node.js')).HostRuntime.HOST_RUNTIME;
  }

  throw new Error('Unknown runtime!');
})();