import type { GraphQLFetcherResult } from '@commerce/api';
import type { HookFetcherContext } from '@commerce/utils/types';
import type { AuthTokenAttr } from '@spree/storefront-api-v2-sdk/types/interfaces/Authentication';
import type { AssociateCart } from '@spree/storefront-api-v2-sdk/types/interfaces/endpoints/CartClass';
import type { IOrder } from '@spree/storefront-api-v2-sdk/types/interfaces/Order';
import type { IOAuthToken, IToken } from '@spree/storefront-api-v2-sdk/types/interfaces/Token';
import { getCartToken, removeCartToken } from './tokens/cart-token';
import { setUserTokenResponse } from './tokens/user-token-response';

const login = async (
  fetch: HookFetcherContext<{
    data: any;
  }>['fetch'],
  getTokenParameters: AuthTokenAttr,
  associateGuestCart: boolean
): Promise<void> => {
  const { data: spreeGetTokenSuccessResponse } = await fetch<GraphQLFetcherResult<IOAuthToken>>({
    variables: {
      methodPath: 'authentication.getToken',
      arguments: [getTokenParameters]
    }
  });

  setUserTokenResponse(spreeGetTokenSuccessResponse);

  if (associateGuestCart) {
    const cartToken = getCartToken();

    if (cartToken) {
      // If the user had a cart as guest still use its contents
      // after logging in.
      const accessToken = spreeGetTokenSuccessResponse.access_token;
      const token: IToken = { bearerToken: accessToken };

      const associateGuestCartParameters: AssociateCart = {
        guest_order_token: cartToken
      };

      await fetch<GraphQLFetcherResult<IOrder>>({
        variables: {
          methodPath: 'cart.associateGuestCart',
          arguments: [token, associateGuestCartParameters]
        }
      });

      // We no longer need the guest cart token, so let's remove it.
    }
  }

  removeCartToken();
};

export default login;