import type { FeedItem } from '../../interfaces/feed.types.js';

interface JsonFeedItem {
  id: string;
  source: string;
  title: string;
  url: string;
  publishedAt: string;
  content?: string;
  summary?: string;
}

export class JsonFormatter {
  format(items: FeedItem[]): string {
    const jsonItems: JsonFeedItem[] = items.map(item => ({
      id: item.id,
      source: item.source,
      title: item.title,
      url: item.url,
      publishedAt: item.publishedAt.toISOString(),
      ...(item.content !== undefined && { content: item.content }),
      ...(item.summary !== undefined && { summary: item.summary })
    }));

    return JSON.stringify(jsonItems, null, 2);
  }
}