'use strict';

module.exports.create = function (deps, conf) {
  var loopback = require('./loopback').create(deps, conf);
  var dnsCtrl = require('./dns-ctrl').create(deps, conf);

  async function getSession() {
    var sessions = await deps.storage.owners.all();
    var session = sessions.filter(function (sess) {
      return sess.token.scp.indexOf('dns') >= 0;
    })[0];

    if (!session) {
      throw new Error('no sessions with DNS grants');
    }

    // The OAUTH3 library stores some things on the root session object that we usually
    // just leave inside the token, but we need to pull those out before we use it here
    session.provider_uri = session.provider_uri || session.token.provider_uri || session.token.iss;
    session.client_uri = session.client_uri || session.token.azp;
    session.scope = session.scope || session.token.scp;
    return session;
  }

  var publicAddress;
  async function recheckPubAddr() {
    if (!conf.ddns.enabled) {
      return;
    }

    var session = await getSession();
    var directives = await deps.OAUTH3.discover(session.token.aud);
    var addr = await loopback.checkPublicAddr(directives.api);

    if (publicAddress === addr) {
      return;
    }

    if (conf.debug) {
      console.log('previous public address',publicAddress, 'does not match current public address', addr);
    }

    await dnsCtrl.setDeviceAddress(session, addr);
    publicAddress = addr;
  }

  recheckPubAddr();
  setInterval(recheckPubAddr, 5*60*1000);

  return {
    loopbackServer:     loopback.server
  , setDeviceAddress:   dnsCtrl.setDeviceAddress
  , getDeviceAddresses: dnsCtrl.getDeviceAddresses
  , recheckPubAddr:     recheckPubAddr
  };
};