'use strict';

const { parse, serialize } = require('../xml');

const axios = require('axios');
const { v4 } = require('uuid');
const { escape } = require('querystring');

class Ven {
  constructor(
    endpoint,
    clientCertPem,
    commonName,
    venId,
    venName,
    registrationId,
  ) {
    if (!endpoint.endsWith('/')) endpoint += '/';
    this.endpoint = endpoint;
    this.clientCertHeader = escape(clientCertPem);
    this.venId = venId;
    this.registrationId = registrationId;
    this.venName = venName;
    this.commonName = commonName;
  }

  async queryRegistration() {
    const message = {
      _type: 'oadrQueryRegistration',
      requestId: v4(),
    };

    const createdResponse = await this.makeRequest('EiRegisterParty', message);

    // track registrationId for subsequent requests
    this.registrationId = createdResponse.registrationId;
    return createdResponse;
  }

  async cancelRegistration() {
    const message = {
      _type: 'oadrCancelPartyRegistration',
      requestId: v4(),
      registrationId: this.registrationId,
      venId: this.venId,
    };

    const cancelledResponse = await this.makeRequest(
      'EiRegisterParty',
      message,
    );

    // track registrationId for subsequent requests
    this.registrationId = undefined;
    return cancelledResponse;
  }

  async register() {
    const message = {
      _type: 'oadrCreatePartyRegistration',
      requestId: v4(),
      registrationId: this.registrationId,
      venId: this.venId,
      oadrProfileName: '2.0b',
      oadrTransportName: 'simpleHttp',
      oadrReportOnly: false,
      oadrXmlSignature: false,
      oadrVenName: this.venName,
      oadrHttpPullModel: true,
    };

    const createdResponse = await this.makeRequest('EiRegisterParty', message);

    // track registrationId for subsequent requests
    this.registrationId = createdResponse.registrationId;
    return createdResponse;
  }

  async requestEvents() {
    const message = {
      _type: 'oadrRequestEvent',
      requestId: v4(),
      venId: this.venId,
    };

    const response = await this.makeRequest('EiEvent', message);

    return response;
  }

  async poll() {
    const message = {
      _type: 'oadrPoll',
      venId: this.venId,
    };

    const response = await this.makeRequest('OadrPoll', message);

    return response;
  }

  async opt(optType, eventId, modificationNumber) {
    const message = {
      _type: 'oadrCreatedEvent',
      responseCode: '200',
      responseDescription: 'OK',
      responseRequestId: '',
      venId: this.venId,
      eventResponses: [
        {
          responseCode: '200',
          responseDescription: 'OK',
          responseRequestId: '',
          optType: optType,
          eventId: eventId,
          modificationNumber: modificationNumber,
        },
      ],
    };
    return await this.makeRequest('EiEvent', message);
  }

  async registerReports(oadrReports) {
    const message = {
      _type: 'oadrRegisterReport',
      requestId: v4(),
      venId: this.venId,
      reports: oadrReports,
    };
    return await this.makeRequest('EiReport', message);
  }

  async notifyCreatedReports(createRequestId, reportRequestIds) {
    const message = {
      _type: 'oadrCreatedReport',
      responseCode: '200',
      responseDescription: 'OK',
      responseRequestId: createRequestId,
      venId: this.venId,
      pendingReports: reportRequestIds.map(x => ({ reportRequestId: x })),
    };
    return await this.makeRequest('EiReport', message);
  }

  async sendReportData(reports) {
    const message = {
      _type: 'oadrUpdateReport',
      reports: reports,
      requestId: v4(),
    };
    return await this.makeRequest('EiReport', message);
  }

  async makeRequest(service, message) {
    const xml = serialize(message);

    const config = {
      headers: {
        'Content-Type': 'application/xml',
        // these next 2 headers are provided manually for now, simulating what nginx is doing.
        SSL_CLIENT_S_DN_CN: this.commonName || 'no_client_cert',
        SSL_CLIENT_CERTIFICATE: this.clientCertHeader,
      },
    };

    // axios will automatically reject HTTP response codes outside the 200-299 range
    const httpResponse = await axios.post(
      `${this.endpoint}OpenADR2/Simple/2.0b/${service}`,
      xml,
      config,
    );
    const response = await parse(httpResponse.data);

    // but OpenADR provides its own response code in the XML envelope, we need to check that
    if (response.responseCode < 200 || response.responseCode >= 300) {
      throw new Error(
        `Error during ${service} call. ResponseCode=${response.responseCode}, ResponseDescription=${response.responseDescription}`,
      );
    }

    return response;
  }
}

module.exports = {
  Ven,
};