import MissingProductError from '../../errors/MissingProductError';
import MissingVariantError from '../../errors/MissingVariantError';
import { jsonApi } from '@spree/storefront-api-v2-sdk';
import type { ProductAttr } from '@spree/storefront-api-v2-sdk/types/interfaces/Product';
import type { WishedItemAttr } from '@spree/storefront-api-v2-sdk/types/interfaces/WishedItem';
import type { WishlistAttr } from '@spree/storefront-api-v2-sdk/types/interfaces/Wishlist';
import type { ExplicitCommerceWishlist, SpreeSdkResponse, VariantAttr } from '../../types';
import normalizeProduct from './normalize-product';

const normalizeWishlist = (
  spreeSuccessResponse: SpreeSdkResponse,
  spreeWishlist: WishlistAttr
): ExplicitCommerceWishlist => {
  const spreeWishedItems = jsonApi.findRelationshipDocuments<WishedItemAttr>(
    spreeSuccessResponse,
    spreeWishlist,
    'wished_items'
  );

  const items: ExplicitCommerceWishlist['items'] = spreeWishedItems.map((spreeWishedItem) => {
    const spreeWishedVariant = jsonApi.findSingleRelationshipDocument<VariantAttr>(
      spreeSuccessResponse,
      spreeWishedItem,
      'variant'
    );

    if (spreeWishedVariant === null) {
      throw new MissingVariantError(
        `Couldn't find variant for wished item with id ${spreeWishedItem.id}.`
      );
    }

    const spreeWishedProduct = jsonApi.findSingleRelationshipDocument<ProductAttr>(
      spreeSuccessResponse,
      spreeWishedVariant,
      'product'
    );

    if (spreeWishedProduct === null) {
      throw new MissingProductError(
        `Couldn't find product for variant with id ${spreeWishedVariant.id}.`
      );
    }

    return {
      id: spreeWishedItem.id,
      product_id: parseInt(spreeWishedProduct.id, 10),
      variant_id: parseInt(spreeWishedVariant.id, 10),
      product: normalizeProduct(spreeSuccessResponse, spreeWishedProduct)
    };
  });

  return {
    id: spreeWishlist.id,
    token: spreeWishlist.attributes.token,
    items
  };
};

export default normalizeWishlist;