'use client';

import { useEffect, useState } from 'react';
import type { Product } from 'brainerce';
import { getClient } from '@/core/lib/brainerce';
import { useRegion } from '@/core/providers/store-provider';

export interface UseHomeDataResult {
  /** Newest products for the featured grid (max 8). */
  products: Product[];
  /** True while the initial fetch is in flight. */
  loading: boolean;
}

/**
 * Homepage data: the featured product grid.
 *
 * Discount banners are deliberately NOT fetched here. They render below the
 * header on every page, so the root layout fetches them server-side and hands
 * them to `<DiscountBannerStrip>`. Fetching them again on the home page would
 * be a duplicate request and a second, later-arriving copy of the same strip.
 *
 * Pure data/behavior — rendering lives in `ui/home/`.
 */
export function useHomeData(): UseHomeDataResult {
  const [products, setProducts] = useState<Product[]>([]);
  const [loading, setLoading] = useState(true);
  // ⛔ Every product read carries the region, or the featured grid quotes the
  // default region's currency to a shopper the product page then prices
  // differently. `undefined` on a store with no regions, and the SDK omits
  // the param, so a single-region store behaves exactly as before.
  const { regionId } = useRegion();

  useEffect(() => {
    async function load() {
      try {
        const client = getClient();
        const [productsRes] = await Promise.allSettled([
          client.getProducts({
            limit: 8,
            sortBy: 'createdAt',
            sortOrder: 'desc',
            ...(regionId ? { regionId } : {}),
          }),
        ]);

        if (productsRes.status === 'fulfilled') {
          setProducts(productsRes.value.data);
        }
      } catch (err) {
        console.error('Failed to load home page data:', err);
      } finally {
        setLoading(false);
      }
    }

    load();
    // Re-runs when the shopper switches region, so the grid re-prices instead
    // of keeping the currency it was first rendered with.
  }, [regionId]);

  return { products, loading };
}