// Dynamic cheerio import used to avoid client-side bundling issues
// Using any type for CheerioAPI to prevent bundling issues
import { 
  LinkWithPathStrategy, 
  HrefPatternStrategy,
  FirstImageStrategy,
  ResponsiveImageStrategy,
  LazyLoadedStrategy 
} from '../types';

export function extractLinkWithPath(
  $: any,
  config: LinkWithPathStrategy
): string {
  let searchScope = config.searchWithin ? $(config.searchWithin) : $('body');
  
  const links = searchScope.find('a');
  
  for (let i = 0; i < links.length; i++) {
    const link = links.eq(i);
    const href = link.attr('href');
    
    if (href && href.includes(config.pathContains)) {
      return link.text().trim();
    }
  }
  
  return '';
}

export function extractHrefPattern(
  $: any,
  config: HrefPatternStrategy
): string[] {
  let searchScope = config.searchWithin ? $(config.searchWithin) : $('body');
  
  const pattern = new RegExp(config.pattern);
  const links: string[] = [];
  
  searchScope.find('a').each((_: any, elem: any) => {
    const href = $(elem).attr('href');
    if (href && pattern.test(href)) {
      links.push(href);
    }
  });
  
  return links;
}

export function extractFirstImage(
  $: any,
  config: FirstImageStrategy
): string {
  let searchScope = config.searchWithin ? $(config.searchWithin) : $('body');
  
  const img = searchScope.find('img').first();
  return img.attr(config.attribute) || '';
}

export function extractResponsiveImage(
  $: any,
  config: ResponsiveImageStrategy
): string {
  const img = $(config.selector).first();
  
  if (config.selectLargest && config.srcsetAttribute) {
    const srcset = img.attr(config.srcsetAttribute);
    if (srcset) {
      // Parse srcset and return the largest image
      const sources = srcset.split(',').map((src: string) => {
        const parts = src.trim().split(' ');
        const url = parts[0];
        const descriptor = parts[1] || '1x';
        const width = descriptor.includes('w') ? 
          parseInt(descriptor.replace('w', '')) : 
          descriptor.includes('x') ? 
            parseInt(descriptor.replace('x', '')) * 100 : 100;
        return { url, width };
      });
      
      const largest = sources.reduce((prev: any, current: any) => 
        prev.width > current.width ? prev : current
      );
      
      return largest.url;
    }
  }
  
  return img.attr('src') || '';
}

export function extractLazyLoadedImage(
  $: any,
  config: LazyLoadedStrategy
): string {
  const img = $(config.selector).first();
  return img.attr(config.attribute) || img.attr('src') || '';
}