import {MissingRequiredArgument} from '../../error';
import {Context} from '../../context';
import {ShopifyHeader} from '../../base_types';
import {HttpClient} from '../http_client/http_client';
import {DataType, RequestReturn} from '../http_client/types';
import * as ShopifyErrors from '../../error';

import {GraphqlParams} from './types';

export class GraphqlClient {
  private readonly client: HttpClient;

  constructor(readonly domain: string, readonly token?: string) {
    if (!Context.IS_PRIVATE_APP && !token) {
      throw new ShopifyErrors.MissingRequiredArgument('Missing access token when creating GraphQL client');
    }

    this.client = new HttpClient(this.domain);
  }

  async query(params: GraphqlParams): Promise<RequestReturn> {
    if (params.data.length === 0) {
      throw new MissingRequiredArgument('Query missing.');
    }

    params.extraHeaders = {
      [ShopifyHeader.AccessToken]: Context.IS_PRIVATE_APP ? Context.API_SECRET_KEY : this.token as string,
      ...params.extraHeaders,
    };
    const path = `/admin/api/${Context.API_VERSION}/graphql.json`;

    let dataType: DataType.GraphQL | DataType.JSON;

    if (typeof params.data === 'object') {
      dataType = DataType.JSON;
    } else {
      dataType = DataType.GraphQL;
    }

    return this.client.post({path, type: dataType, ...params});
  }
}