geolocal-io/code/src/tools/get-related-businesses.ts

import { pool } from '../db/schema.js';

export async function getRelatedBusinesses(params: { slug: string }): Promise<Record<string, any>> {
  const result = await pool.query(
    `SELECT id, slug, name, category, city, state, story, related_business_ids
     FROM businesses
     WHERE slug = $1`,
    [params.slug]
  );

  if (result.rows.length === 0) {
    return { error: `Business '${params.slug}' not found` };
  }

  const business = result.rows[0];
  const relatedIds = JSON.parse(business.related_business_ids || '[]');

  if (relatedIds.length === 0) {
    // Fallback: same category, same city
    const fallback = await pool.query(
      `SELECT slug, name, category, city, state, story
       FROM businesses
       WHERE category = $1 AND city = $2 AND slug != $3
       LIMIT 5`,
      [business.category, business.city, params.slug]
    );

    return {
      source_business: business.name,
      related: fallback.rows.map((r: any) => ({
        slug: r.slug,
        name: r.name,
        category: r.category,
        location: `${r.city}, ${r.state}`,
        story: r.story,
      })),
    };
  }

  // Resolve related business IDs
  const relatedResult = await pool.query(
    `SELECT slug, name, category, city, state, story
     FROM businesses
     WHERE id = ANY($1)`,
    [relatedIds]
  );

  return {
    source_business: business.name,
    related: relatedResult.rows.map((r: any) => ({
      slug: r.slug,
      name: r.name,
      category: r.category,
      location: `${r.city}, ${r.state}`,
      story: r.story,
    })),
  };
}