import * as plugins from './paypal.plugins';

export interface IPayPalOptions {
  clientId: string;
  clientSecret: string;
}

export class PayPal {
  public apiBaseUrl: string = 'https://api.paypal.com'
  public options: IPayPalOptions;

  private apiToken: string;
  private apiTokenExpirationTime: number;

  constructor(optionsArg: IPayPalOptions) {
    this.options = optionsArg;
  }

  public async request(methodArg: 'GET' | 'POST', routeArg: string, payloadArg: any) {
    if (!this.apiToken || this.apiTokenExpirationTime < Date.now()) {
      const authHeader = `Basic ${plugins.smartstring.base64.encode(
        `${this.options.clientId}:${this.options.clientSecret}`
      )}`;
      const response = await plugins.smartrequest.request(
        `${this.apiBaseUrl}/v1/oauth2/token?grant_type=client_credentials`,
        {
          method: 'POST',
          headers: {
            Accept: 'application/json',
            'Accept-Language': 'en_US',
            Authorization: authHeader,
          },
          keepAlive: false,
        }
      );
      this.apiToken = response.body.access_token;
      this.apiTokenExpirationTime = Date.now() + response.body.expires_in * 1000 - 600000;
    }

    // we have a token
    const response = await plugins.smartrequest.request(`${this.apiBaseUrl}${routeArg}`, {
      method: 'GET',
      headers: {
        Accept: 'application/json',
        'Accept-Language': 'en_US',
        Authorization: `Bearer ${this.apiToken}`,
      },
    });
    return response.body;
  }
}