import { CmsClient } from './cms-client';
import { CmsType } from './cms.type';

/**
 * Creates a CMS client based on the specified type.
 *
 * @param {CmsType} type - The type of CMS client to create. Defaults to the value of the CMS_CLIENT environment variable.
 * @returns {Promise<CmsClient>} A Promise that resolves to the created CMS client.
 * @throws {Error} If the specified CMS type is unknown.
 */
export async function createCmsClient(
  type: CmsType = process.env.CMS_CLIENT as CmsType,
): Promise<CmsClient> {
  return cmsClientFactory(type);
}

async function cmsClientFactory(type: CmsType) {
  switch (type) {
    case 'wordpress':
      return getWordpressClient();

    case 'keystatic':
      return getKeystaticClient();

    default:
      throw new Error(`Unknown CMS type`);
  }
}

async function getWordpressClient() {
  const { WordpressClient } = await import('../../wordpress/src/wp-client');

  return new WordpressClient();
}

async function getKeystaticClient() {
  if (
    process.env.NEXT_RUNTIME === 'nodejs' ||
    process.env.KEYSTATIC_STORAGE_KIND !== 'local'
  ) {
    const { KeystaticClient } = await import('../../keystatic/src/client');

    return new KeystaticClient();
  }

  console.error(
    `[CMS] Keystatic client using "Local" mode is only available in Node.js runtime. Please choose a different CMS client. Returning a mock client instead of throwing an error.`,
  );

  return mockCMSClient() as unknown as CmsClient;
}

function mockCMSClient() {
  return {
    getContentItems() {
      return Promise.resolve({
        items: [],
        total: 0,
      });
    },
    getContentItemBySlug() {
      return Promise.resolve(undefined);
    },
  };
}