import { toIetfLocale } from './toIetfLocale';
import type { ContentArticleList } from '@nacelle/types';
import type { Content } from 'storefrontSdkV1';
import { destructureNacelleEntryId } from '../../src/utils';

export type NacelleReference = Pick<
  Content,
  'type' | 'locale' | 'nacelleEntryId'
> & {
  message?: string;
  referenceType?: string;
};

export const createArticleReferenceErrorMessage = (
  blogHandle: string,
  problematicArticles: string[]
): string =>
  `In blog '${blogHandle}', articles with sourceEntryId: ${problematicArticles.join(
    ', '
  )} are not valid. Please check your CMS to ensure that these articles are correctly referenced by the '${blogHandle}' blog.`;

export function transformArticleLists(
  articlesInput: Array<Content | NacelleReference> | null,
  blogHandle: string,
  locale: string
): ContentArticleList[] | null {
  if (!articlesInput || !Array.isArray(articlesInput)) {
    return null;
  }

  const problematicArticles: string[] = [];

  const handles: string[] = articlesInput.map((article) => {
    if ('fields' in article && typeof article.fields !== 'undefined') {
      return article.fields.handle;
    }
    const { sourceEntryId } = destructureNacelleEntryId(article.nacelleEntryId);
    problematicArticles.push(sourceEntryId);
    return '';
  });

  if (problematicArticles.length) {
    throw new Error(
      createArticleReferenceErrorMessage(blogHandle, problematicArticles)
    );
  }

  return [
    {
      handles,
      locale: toIetfLocale(locale),
      slug: 'default',
      title: 'default'
    }
  ];
}