How to Build a How Many Calculator

// "How many" query discovery and analysis
  async function discoverHowManyQueries(seed: string): Promise<AnalyzedQuery[]> {
  const prefix = 'how many';
  const raw: string[] = [];

  // Alphabet expansion
  for (const letter of 'abcdefghijklmnopqrstuvwxyz'.split('')) {
    const suggestions = await googleAutocomplete(`${prefix} ${seed} ${letter}`);
    raw.push(...suggestions);
  }

  // Number expansion (how many X in 1, 2, 3...)
  for (let n = 1; n <= 10; n++) {
    const suggestions = await googleAutocomplete(`${prefix} ${seed} ${n}`);
    raw.push(...suggestions);
  }

  // Preposition expansion
  for (const prep of ['in', 'are', 'does', 'do', 'can', 'is', 'per']) {
    const suggestions = await googleAutocomplete(`${prefix} ${prep} ${seed}`);
    raw.push(...suggestions);
  }

  const unique = [...new Set(raw)];

  // Analyze each query
  return Promise.all(unique.map(async (query) => {
    const volume = await estimateVolume(query);
    const serp = await analyzeSERP(query);
    return {
      query,
      estimatedVolume: volume,
      hasFeaturedSnippet: serp.featuredSnippet !== null,
      topResultQuality: serp.topResultWordCount > 500 ? 'strong' : 'weak',
      category: classifyCategory(query)
    };
  }));
  }

  interface AnalyzedQuery {
  query: string;
  estimatedVolume: number;
  hasFeaturedSnippet: boolean;
  topResultQuality: 'strong' | 'weak';
  category: string;
  }

  function classifyCategory(query: string): string {
  const categories: Record<string, string[]> = {
    measurement: ['ounces', 'cups', 'liters', 'gallons', 'grams', 'pounds', 'feet', 'meters'],
    geography: ['countries', 'states', 'continents', 'cities', 'oceans', 'islands'],
    science: ['elements', 'planets', 'bones', 'chromosomes', 'cells', 'atoms'],
    nutrition: ['calories', 'carbs', 'protein', 'sugar', 'sodium'],
    entertainment: ['episodes', 'seasons', 'books', 'movies', 'songs'],
  };

  for (const [cat, keywords] of Object.entries(categories)) {
    if (keywords.some(kw => query.includes(kw))) return cat;
  }
  return 'general';
  }