import type { SpreeApiConfig, SpreeApiProvider } from '../index';
import type { GetProductOperation } from '@commerce/types/product';
import type { OperationContext, OperationOptions } from '@commerce/api/operations';
import type { IProduct } from '@spree/storefront-api-v2-sdk/types/interfaces/Product';
import type { SpreeSdkVariables } from '../../types';
import MissingSlugVariableError from '../../errors/MissingSlugVariableError';
import normalizeProduct from '../../utils/normalizations/normalize-product';
import { requireConfigValue } from '../../isomorphic-config';

const imagesSize = requireConfigValue('imagesSize') as string;
const imagesQuality = requireConfigValue('imagesQuality') as number;

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

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

  async function getProduct<T extends GetProductOperation>({
    query = '',
    variables: getProductVariables,
    config: userConfig
  }: {
    query?: string;
    variables?: T['variables'];
    config?: Partial<SpreeApiConfig>;
    preview?: boolean;
  }): Promise<T['data']> {
    console.log(
      'getProduct called. Configuration: ',
      'getProductVariables: ',
      getProductVariables,
      'config: ',
      userConfig
    );

    if (!getProductVariables?.slug) {
      throw new MissingSlugVariableError();
    }

    const variables: SpreeSdkVariables = {
      methodPath: 'products.show',
      arguments: [
        getProductVariables.slug,
        {},
        {
          include: 'primary_variant,variants,images,option_types,variants.option_values',
          image_transformation: {
            quality: imagesQuality,
            size: imagesSize
          }
        }
      ]
    };

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

    const { data: spreeSuccessResponse } = await apiFetch<IProduct, SpreeSdkVariables>(
      '__UNUSED__',
      {
        variables
      }
    );

    return {
      product: normalizeProduct(spreeSuccessResponse, spreeSuccessResponse.data)
    };
  }

  return getProduct;
}