Function isDifferenceOnlyArticles

Source

export function isDifferenceOnlyArticles(
  leftTitle: string,
  rightTitle: string,
): boolean {
  const articles = new Set(["a", "an", "the"]);

  // Normalize both titles (now uses cache)
  const leftWords = normalizeForMatching(leftTitle)
    .split(/\s+/)
    .filter((word) => word.length > 0);
  const rightWords = normalizeForMatching(rightTitle)
    .split(/\s+/)
    .filter((word) => word.length > 0);

  console.debug(
    `[MangaSearchService] 🔍 Checking article difference between "${leftTitle}" and "${rightTitle}"`,
  );
  console.debug(
    `[MangaSearchService]   Normalized: ["${leftWords.join('", "')}" vs ["${rightWords.join('", "')}"]`,
  );

  // Find the longer and shorter word arrays
  const [longer, shorter] =
    leftWords.length >= rightWords.length
      ? [leftWords, rightWords]
      : [rightWords, leftWords];

  // If they have the same number of words, they're not article-different
  if (longer.length === shorter.length) {
    console.debug(`[MangaSearchService]   Same length, not article difference`);
    return false;
  }

  // Remove all articles from both arrays and compare
  const longerWithoutArticles = longer.filter((word) => !articles.has(word));
  const shorterWithoutArticles = shorter.filter((word) => !articles.has(word));

  console.debug(
    `[MangaSearchService]   Without articles: ["${longerWithoutArticles.join('", "')}" vs ["${shorterWithoutArticles.join('", "')}"]`,
  );

  // If after removing articles, they're identical, then the difference was only articles
  const isArticleOnly =
    longerWithoutArticles.length === shorterWithoutArticles.length &&
    longerWithoutArticles.every(
      (word, index) => word === shorterWithoutArticles[index],
    );

  console.debug(
    `[MangaSearchService]   Article-only difference: ${isArticleOnly}`,
  );
  return isArticleOnly;
}
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