import { SpreeApiConfig } from '..';
import { errors, makeClient } from '@spree/storefront-api-v2-sdk';
import { requireConfigValue } from '../../isomorphic-config';
import convertSpreeErrorToGraphQlError from '../../utils/convert-spree-error-to-graph-ql-error';
import type { ResultResponse } from '@spree/storefront-api-v2-sdk/types/interfaces/ResultResponse';
import getSpreeSdkMethodFromEndpointPath from '../../utils/get-spree-sdk-method-from-endpoint-path';
import SpreeSdkMethodFromEndpointPathError from '../../errors/SpreeSdkMethodFromEndpointPathError';
import { GraphQLFetcher, GraphQLFetcherResult } from '@commerce/api';
import createCustomizedFetchFetcher, {
  fetchResponseKey
} from '../../utils/create-customized-fetch-fetcher';
import fetch, { Request } from 'node-fetch';
import type { SpreeSdkResponseWithRawResponse } from '../../types';

export type CreateApiFetch = (
  getConfig: () => SpreeApiConfig
) => GraphQLFetcher<GraphQLFetcherResult<any>, any>;

// TODO: GraphQLFetcher<GraphQLFetcherResult<any>, any> should be GraphQLFetcher<GraphQLFetcherResult<any>, SpreeSdkVariables>.
// But CommerceAPIConfig['fetch'] cannot be extended from Variables = any to SpreeSdkVariables.

const createApiFetch: CreateApiFetch = (_getConfig) => {
  const client = makeClient({
    host: requireConfigValue('apiHost') as string,
    createFetcher: (fetcherOptions) => {
      return createCustomizedFetchFetcher({
        fetch,
        requestConstructor: Request,
        ...fetcherOptions
      });
    }
  });

  return async (url, queryData = {}, fetchOptions = {}) => {
    console.log(
      'apiFetch called. query = ',
      'url = ',
      url,
      'queryData = ',
      queryData,
      'fetchOptions = ',
      fetchOptions
    );

    const { variables } = queryData;

    if (!variables) {
      throw new SpreeSdkMethodFromEndpointPathError(`Required SpreeSdkVariables not provided.`);
    }

    const storeResponse: ResultResponse<SpreeSdkResponseWithRawResponse> =
      await getSpreeSdkMethodFromEndpointPath(client, variables.methodPath)(...variables.arguments);

    if (storeResponse.isSuccess()) {
      const data = storeResponse.success();
      const rawFetchResponse = data[fetchResponseKey];

      return {
        data,
        res: rawFetchResponse
      };
    }

    const storeResponseError = storeResponse.fail();

    if (storeResponseError instanceof errors.SpreeError) {
      throw convertSpreeErrorToGraphQlError(storeResponseError);
    }

    throw storeResponseError;
  };
};

export default createApiFetch;