import { discountPercent, isInStock } from "./format";
import { productHref } from "./slug";
import { DEMO_PRICING, demoPrice } from "./demoPricing";
import type { ApiProduct, ProductCardData, StoreItem, StoreSpecial } from "./types";

export function productToCard(product: ApiProduct): ProductCardData {
  const base = {
    id: product.id,
    href: productHref(product.id, product.nameFa, product.title),
    title: product.nameFa || product.title,
    image: product.thumbnailUrl || product.image || product.thumbnail,
  };

  if (product.store.minPrice !== null) {
    return { ...base, price: product.store.minPrice, oldPrice: null, percent: 0, inStock: product.store.inStock };
  }

  if (DEMO_PRICING) {
    const { price, oldPrice } = demoPrice(product);
    return {
      ...base,
      price,
      oldPrice,
      percent: oldPrice ? discountPercent(price, oldPrice) : 0,
      inStock: true,
    };
  }

  return { ...base, price: null, oldPrice: null, percent: 0, inStock: false };
}

// Unlike products, every store-item always has a real price/stock — that's
// the whole point of the /store-items endpoint — so this never touches
// demoPricing. Links to the item's own /store-items/{id} detail page, not
// the parent product's page.
export function storeItemToCard(item: StoreItem): ProductCardData {
  const price = item.discountedPrice ?? item.price;
  const oldPrice = item.discountedPrice !== null ? item.price : null;
  return {
    id: item.id,
    href: `/store-items/${item.id}`,
    title: item.productNameFa || item.productTitle,
    image: item.productImage,
    price,
    oldPrice,
    percent: price !== null && oldPrice !== null ? discountPercent(price, oldPrice) : 0,
    inStock: item.stockQuantity > 0,
  };
}

// A curated store-special group carries its own variant pricing, so the
// discount shown there is the real one rather than a product-level guess.
export function specialToCards(special: StoreSpecial): ProductCardData[] {
  return special.items
    .filter((item) => item.isActive)
    .map((item) => {
      const variant = item.variants.find((v) => v.discountedPrice !== null) ?? item.variants[0];
      const price = variant?.discountedPrice ?? variant?.price ?? null;
      const oldPrice = variant?.discountedPrice !== null ? variant?.price ?? null : null;
      return {
        id: item.id,
        href: productHref(item.productId, item.productNameFa, item.productTitle),
        title: item.productNameFa || item.productTitle,
        image: item.productImage,
        price,
        oldPrice,
        percent: price !== null && oldPrice !== null ? discountPercent(price, oldPrice) : 0,
        inStock: isInStock(variant?.stockQuantity),
      };
    });
}