import type { Product, ProductImage, ProductPrice, ProductVariant } from '@commerce/types/product';
import type { ProductAttr } from '@spree/storefront-api-v2-sdk/types/interfaces/Product';
import type { RelationType } from '@spree/storefront-api-v2-sdk/types/interfaces/Relationships';
import { jsonApi } from '@spree/storefront-api-v2-sdk';
import { JsonApiDocument } from '@spree/storefront-api-v2-sdk/types/interfaces/JsonApi';
import { requireConfigValue } from '../../isomorphic-config';
import createGetAbsoluteImageUrl from '../create-get-absolute-image-url';
import expandOptions from '../expand-options';
import getMediaGallery from '../get-media-gallery';
import getProductPath from '../get-product-path';
import MissingPrimaryVariantError from '../../errors/MissingPrimaryVariantError';
import MissingOptionValueError from '../../errors/MissingOptionValueError';
import type { ExpandedProductOption, SpreeSdkResponse, VariantAttr } from '../../types';

const placeholderImage = requireConfigValue('productPlaceholderImageUrl') as string | false;

const imagesOptionFilter = requireConfigValue('imagesOptionFilter') as string | false;

const normalizeProduct = (
  spreeSuccessResponse: SpreeSdkResponse,
  spreeProduct: ProductAttr
): Product => {
  const spreePrimaryVariant = jsonApi.findSingleRelationshipDocument<VariantAttr>(
    spreeSuccessResponse,
    spreeProduct,
    'primary_variant'
  );

  if (spreePrimaryVariant === null) {
    throw new MissingPrimaryVariantError(
      `Couldn't find primary variant for product with id ${spreeProduct.id}.`
    );
  }

  const sku = spreePrimaryVariant.attributes.sku;

  const price: ProductPrice = {
    value: parseFloat(spreeProduct.attributes.price),
    currencyCode: spreeProduct.attributes.currency
  };

  const hasNonMasterVariants =
    (spreeProduct.relationships.variants.data as RelationType[]).length > 1;

  const showOptions =
    (requireConfigValue('showSingleVariantOptions') as boolean) || hasNonMasterVariants;

  let options: ExpandedProductOption[] = [];

  const spreeVariantRecords = jsonApi.findRelationshipDocuments(
    spreeSuccessResponse,
    spreeProduct,
    'variants'
  );

  // Use variants with option values if available. Fall back to
  // Spree primary_variant if no explicit variants are present.
  const spreeOptionsVariantsOrPrimary =
    spreeVariantRecords.length === 0 ? [spreePrimaryVariant] : spreeVariantRecords;

  const variants: ProductVariant[] = spreeOptionsVariantsOrPrimary.map((spreeVariantRecord) => {
    let variantOptions: ExpandedProductOption[] = [];

    if (showOptions) {
      const spreeOptionValues = jsonApi.findRelationshipDocuments(
        spreeSuccessResponse,
        spreeVariantRecord,
        'option_values'
      );

      // Only include options which are used by variants.

      spreeOptionValues.forEach((spreeOptionValue) => {
        variantOptions = expandOptions(spreeSuccessResponse, spreeOptionValue, variantOptions);

        options = expandOptions(spreeSuccessResponse, spreeOptionValue, options);
      });
    }

    return {
      id: spreeVariantRecord.id,
      options: variantOptions
    };
  });

  const spreePrimaryVariantImageRecords = jsonApi.findRelationshipDocuments(
    spreeSuccessResponse,
    spreePrimaryVariant,
    'images'
  );

  let spreeVariantImageRecords: JsonApiDocument[];

  if (imagesOptionFilter === false) {
    spreeVariantImageRecords = spreeVariantRecords.reduce<JsonApiDocument[]>(
      (accumulatedImageRecords, spreeVariantRecord) => {
        return [
          ...accumulatedImageRecords,
          ...jsonApi.findRelationshipDocuments(spreeSuccessResponse, spreeVariantRecord, 'images')
        ];
      },
      []
    );
  } else {
    const spreeOptionTypes = jsonApi.findRelationshipDocuments(
      spreeSuccessResponse,
      spreeProduct,
      'option_types'
    );

    const imagesFilterOptionType = spreeOptionTypes.find(
      (spreeOptionType) => spreeOptionType.attributes.name === imagesOptionFilter
    );

    if (!imagesFilterOptionType) {
      console.warn(
        `Couldn't find option type having name ${imagesOptionFilter} for product with id ${spreeProduct.id}.` +
          ' Showing no images for this product.'
      );

      spreeVariantImageRecords = [];
    } else {
      const imagesOptionTypeFilterId = imagesFilterOptionType.id;
      const includedOptionValuesImagesIds: string[] = [];

      spreeVariantImageRecords = spreeVariantRecords.reduce<JsonApiDocument[]>(
        (accumulatedImageRecords, spreeVariantRecord) => {
          const spreeVariantOptionValuesIdentifiers: RelationType[] =
            spreeVariantRecord.relationships.option_values.data;

          const spreeOptionValueOfFilterTypeIdentifier = spreeVariantOptionValuesIdentifiers.find(
            (spreeVariantOptionValuesIdentifier: RelationType) =>
              imagesFilterOptionType.relationships.option_values.data.some(
                (filterOptionTypeValueIdentifier: RelationType) =>
                  filterOptionTypeValueIdentifier.id === spreeVariantOptionValuesIdentifier.id
              )
          );

          if (!spreeOptionValueOfFilterTypeIdentifier) {
            throw new MissingOptionValueError(
              `Couldn't find option value related to option type with id ${imagesOptionTypeFilterId}.`
            );
          }

          const optionValueImagesAlreadyIncluded = includedOptionValuesImagesIds.includes(
            spreeOptionValueOfFilterTypeIdentifier.id
          );

          if (optionValueImagesAlreadyIncluded) {
            return accumulatedImageRecords;
          }

          includedOptionValuesImagesIds.push(spreeOptionValueOfFilterTypeIdentifier.id);

          return [
            ...accumulatedImageRecords,
            ...jsonApi.findRelationshipDocuments(spreeSuccessResponse, spreeVariantRecord, 'images')
          ];
        },
        []
      );
    }
  }

  const spreeImageRecords = [...spreePrimaryVariantImageRecords, ...spreeVariantImageRecords];

  const productImages = getMediaGallery(
    spreeImageRecords,
    createGetAbsoluteImageUrl(requireConfigValue('imageHost') as string)
  );

  const images: ProductImage[] =
    productImages.length === 0
      ? placeholderImage === false
        ? []
        : [{ url: placeholderImage }]
      : productImages;

  const slug = spreeProduct.attributes.slug;
  const path = getProductPath(spreeProduct);

  return {
    id: spreeProduct.id,
    name: spreeProduct.attributes.name,
    description: spreeProduct.attributes.description,
    images,
    variants,
    options,
    price,
    slug,
    path,
    sku
  };
};

export default normalizeProduct;