import removeTrailingSlash from 'remove-trailing-slash';
import util from 'util';
import { BasicAuthRestClient } from '../authentication/BasicAuthRestClient';
import packageJson from '../../package.json';

const requestVersion = packageJson.dependencies.request;

export class PlatformApiRestClient extends BasicAuthRestClient {
  usingTaskUser: boolean;

  private readonly userAgentHeaders: { 'User-Agent': string, ['x-request-id']: string };

  private readonly userAgent: string;

  private readonly msgId: string;

  constructor(emitter, cfg, userAgent?: string, msgId?: string) {
    if (!!cfg.email !== !!cfg.apiKey) {
      throw new Error('Either both Email and API Key need to be provided or neither should be provided.');
    }
    if (!!cfg.url && (!cfg.email || !cfg.apiKey)) {
      throw new Error('If providing a Platform Instance URL, then an Email and API Key need to be provided as well.');
    }
    const baseUrl = removeTrailingSlash((cfg.url || process.env.ELASTICIO_API_URI).trim());
    const myCfg = {
      username: cfg.email || process.env.ELASTICIO_API_USERNAME,
      password: cfg.apiKey || process.env.ELASTICIO_API_KEY,
      resourceServerUrl: `${baseUrl}/v2`,
    };
    super(emitter, myCfg);
    this.usingTaskUser = !cfg.email;
    if (this.usingTaskUser) {
      this.emitter.logger.debug(`Will connect to ${baseUrl} as task user`);
    } else {
      this.emitter.logger.debug(`Will connect to ${baseUrl} as specified user`);
    }
    this.userAgent = userAgent;
    this.msgId = msgId;
    this.userAgentHeaders = {
      'User-Agent': `${this.userAgent} request/${requestVersion}`,
      'x-request-id': `f:${process.env.ELASTICIO_FLOW_ID};s:${process.env.ELASTICIO_STEP_ID};m:${this.msgId}`,
    };
  }

  handleRestResponse(response) {
    if (response.statusCode >= 400) {
      this.emitter.logger.error(`Error in making request to ${response.request.uri.href} Status code: ${response.statusCode}, Body: ${JSON.stringify(response.body)}`);
      if (response.body.errors && response.body.errors.length > 0) {
        throw new Error(`${response.statusCode} ${response.statusMessage} - ${response.body.errors[0].title}: ${response.body.errors[0].detail}`);
      }
      throw new Error(`Unexpected ${response.statusCode} response - ${response.statusMessage}: ${JSON.stringify(response.body)}`);
    }

    // Check for responses with non-json bodies.
    // It usually means we got a 200 response from something that isn't the platform API
    if (response.body && (!response.headers['content-type'] || !response.headers['content-type'].includes('application/json'))) {
      // eslint-disable-next-line max-len
      this.emitter.logger.error(`Error in making request to ${response.request.uri.href} Expected a JSON response. Status code: ${response.statusCode}, Body: ${util.inspect(response.body)}`);
      throw new Error(`Expected a JSON response. Instead received Content-Type ${response.headers['content-type']} - Is the API URL correct?`);
    }

    this.emitter.logger.trace(`Response statusCode: ${response.statusCode}, body: %j`, response.body);
    return response.body;
  }

  async makeRequest(options) {
    options.headers = {
      ...options.headers, ...this.userAgentHeaders
    };
    return super.makeRequest(options);
  }
}