import type { SeedProduct } from "./categories";
import type { BestBuyProduct } from "./fetch-bestbuy";
import type { AmazonData } from "./scrape-amazon";

export interface RetailerPrice {
  store: string;
  price: number;
  url: string;
  isBest: boolean;
}

export interface UnifiedProduct {
  id: string;
  name: string;
  category: string;
  rating: number;
  reviewCount: number;
  image: string | null;
  prices: RetailerPrice[];
  description: string;
}

function slugify(name: string): string {
  return name
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-|-$/g, "");
}

export function matchProducts(
  seeds: SeedProduct[],
  bestBuyData: Map<string, BestBuyProduct>,
  amazonData: Map<string, AmazonData>,
): UnifiedProduct[] {
  const products: UnifiedProduct[] = [];

  for (const seed of seeds) {
    const bb = bestBuyData.get(seed.name);
    const amz = amazonData.get(seed.name);

    const prices: RetailerPrice[] = [];

    if (bb) {
      const bbPrice = bb.salePrice ?? bb.regularPrice;
      if (bbPrice > 0) {
        prices.push({
          store: "Best Buy",
          price: bbPrice,
          url: bb.url,
          isBest: false,
        });
      }
    }

    if (amz?.price) {
      prices.push({
        store: "Amazon",
        price: amz.price,
        url: amz.url,
        isBest: false,
      });
    }

    if (prices.length === 0) continue;

    const minPrice = Math.min(...prices.map((p) => p.price));
    for (const p of prices) {
      p.isBest = p.price === minPrice;
    }

    const rating = bb?.customerReviewAverage ?? amz?.rating ?? 0;
    const reviewCount = Math.max(
      bb?.customerReviewCount ?? 0,
      amz?.reviewCount ?? 0,
    );
    const image = amz?.image ?? bb?.image ?? null;
    const description = bb?.longDescription ?? "";

    if (rating === 0 && reviewCount === 0) continue;

    products.push({
      id: slugify(seed.name),
      name: seed.name,
      category: seed.category,
      rating: Math.round(rating * 10) / 10,
      reviewCount,
      image,
      prices,
      description,
    });
  }

  return products;
}