import type { OperationContext, OperationOptions } from '@commerce/api/operations';
import type { Category, GetSiteInfoOperation } from '@commerce/types/site';
import type { ITaxons, TaxonAttr } from '@spree/storefront-api-v2-sdk/types/interfaces/Taxon';
import { requireConfigValue } from '../../isomorphic-config';
import type { SpreeSdkVariables } from '../../types';
import type { SpreeApiConfig, SpreeApiProvider } from '..';

const taxonsSort = (spreeTaxon1: TaxonAttr, spreeTaxon2: TaxonAttr): number => {
  const { left: left1, right: right1 } = spreeTaxon1.attributes;
  const { left: left2, right: right2 } = spreeTaxon2.attributes;

  if (right1 < left2) {
    return -1;
  }

  if (right2 < left1) {
    return 1;
  }

  return 0;
};

export type GetSiteInfoResult<
  T extends { categories: any[]; brands: any[] } = {
    categories: Category[];
    brands: any[];
  }
> = T;

export default function getSiteInfoOperation({ commerce }: OperationContext<SpreeApiProvider>) {
  async function getSiteInfo<T extends GetSiteInfoOperation>(opts?: {
    config?: Partial<SpreeApiConfig>;
    preview?: boolean;
  }): Promise<T['data']>;

  async function getSiteInfo<T extends GetSiteInfoOperation>(
    opts: {
      config?: Partial<SpreeApiConfig>;
      preview?: boolean;
    } & OperationOptions
  ): Promise<T['data']>;

  async function getSiteInfo<T extends GetSiteInfoOperation>({
    query,
    variables: getSiteInfoVariables = {},
    config: userConfig
  }: {
    query?: string;
    variables?: any;
    config?: Partial<SpreeApiConfig>;
    preview?: boolean;
  } = {}): Promise<GetSiteInfoResult> {
    console.info(
      'getSiteInfo called. Configuration: ',
      'query: ',
      query,
      'getSiteInfoVariables ',
      getSiteInfoVariables,
      'config: ',
      userConfig
    );

    const createVariables = (parentPermalink: string): SpreeSdkVariables => ({
      methodPath: 'taxons.list',
      arguments: [
        {
          filter: {
            parent_permalink: parentPermalink
          }
        }
      ]
    });

    const config = commerce.getConfig(userConfig);
    const { fetch: apiFetch } = config; // TODO: Send config.locale to Spree.

    const { data: spreeCategoriesSuccessResponse } = await apiFetch<ITaxons, SpreeSdkVariables>(
      '__UNUSED__',
      {
        variables: createVariables(requireConfigValue('categoriesTaxonomyPermalink') as string)
      }
    );

    const { data: spreeBrandsSuccessResponse } = await apiFetch<ITaxons, SpreeSdkVariables>(
      '__UNUSED__',
      {
        variables: createVariables(requireConfigValue('brandsTaxonomyPermalink') as string)
      }
    );

    const normalizedCategories: GetSiteInfoOperation['data']['categories'] =
      spreeCategoriesSuccessResponse.data.sort(taxonsSort).map((spreeTaxon: TaxonAttr) => {
        return {
          id: spreeTaxon.id,
          name: spreeTaxon.attributes.name,
          slug: spreeTaxon.id,
          path: spreeTaxon.id
        };
      });

    const normalizedBrands: GetSiteInfoOperation['data']['brands'] = spreeBrandsSuccessResponse.data
      .sort(taxonsSort)
      .map((spreeTaxon: TaxonAttr) => {
        return {
          node: {
            entityId: spreeTaxon.id,
            path: `brands/${spreeTaxon.id}`,
            name: spreeTaxon.attributes.name
          }
        };
      });

    return {
      categories: normalizedCategories,
      brands: normalizedBrands
    };
  }

  return getSiteInfo;
}