import * as plugins from './smartsitemap.plugins.js';
import type * as interfaces from './interfaces/index.js';

/**
 * Imports sitemap configuration from YAML format.
 * Supports the enhanced YAML schema with per-frequency URL groups,
 * default settings, and feed imports.
 */
export class YamlImporter {
  /**
   * Parse a YAML config string and return ISitemapUrl entries.
   */
  static async parseConfig(yamlString: string): Promise<interfaces.ISitemapUrl[]> {
    const config = (await plugins.smartyaml.yamlStringToObject(yamlString)) as interfaces.ISitemapYamlConfig;
    const urls: interfaces.ISitemapUrl[] = [];
    const baseUrl = config.baseUrl?.replace(/\/$/, '') ?? '';

    // Process URL groups by frequency
    if (config.urls) {
      const frequencies: interfaces.TChangeFreq[] = [
        'always', 'hourly', 'daily', 'weekly', 'monthly', 'yearly', 'never',
      ];

      for (const freq of frequencies) {
        const urlList = config.urls[freq];
        if (urlList && Array.isArray(urlList)) {
          for (const path of urlList) {
            const loc = path.startsWith('http') ? path : `${baseUrl}${path.startsWith('/') ? '' : '/'}${path}`;
            urls.push({
              loc,
              changefreq: freq,
              priority: config.defaults?.priority,
            });
          }
        }
      }
    }

    // Process feed imports
    if (config.feeds && Array.isArray(config.feeds)) {
      // Dynamic import to avoid circular deps at module load time
      const { FeedImporter } = await import('./smartsitemap.classes.feedimporter.js');

      for (const feedConfig of config.feeds) {
        if (feedConfig.type === 'news') {
          const newsUrls = await FeedImporter.fromUrlAsNews(
            feedConfig.url,
            feedConfig.publicationName ?? 'Unknown',
            feedConfig.publicationLanguage ?? 'en',
          );
          urls.push(...newsUrls);
        } else {
          const standardUrls = await FeedImporter.fromUrl(feedConfig.url);
          urls.push(...standardUrls);
        }
      }
    }

    return urls;
  }
}