"use strict";

//var auth = require('./auth.js');
var defaults = {
  baseUrl: "https://www.googleapis.com/dns/v1/"
};

module.exports.create = function(config) {
  var request;
  var baseUrl = (config.baseUrl || defaults.baseUrl).replace(/\/$/, "");
  var token = config.token;
  var sa = getServiceAccount(config);

  var plugin = {
    init: function(opts) {
      request = opts.request;
      return null;
    },
    zones: function(data) {
      //console.info('List Zones', data);
      return api({
        url: baseUrl + "/projects/" + sa.project_id + "/managedZones",
        json: true
      }).then(function(resp) {
        return resp.body.managedZones.map(function(zone) {
          // slice out the trailing dot.
          // ex: "example.com." => "example.com"
          // (assuming that all 'dnsName's probably look the same)
          var name = zone.dnsName.slice(0, zone.dnsName.length - 1);
          console.log("the is name", name);
          return name;
        });
      });
    },
    set: function(data) {
      console.info("Add TXT", data);
      var ch = data.challenge;
      return getZoneNameByDnsName(ch.dnsZone)
        .then(function(gZoneName) {
          return api({
            method: "POST",
            url:
              baseUrl +
              "/projects/" +
              sa.project_id +
              "/managedZones/" +
              gZoneName +
              "/changes",
            json: {
              kind: "dns#change",
              additions: [
                {
                  kind: "dns#resourceRecordSet",
                  name: ch.dnsHost,
                  type: "TXT",
                  ttl: 300, // TODO test for lowest allowed value
                  rrdatas: [ch.dnsAuthorization],
                  signatureRrdatas: []
                }
              ],
              deletions: []
              //"startTime": "string",
              //"id": "string",
              //"status": "string",
              //"isServing": true
            }
          });
        })
        .then(function(resp) {
          if (resp.body.error) {
            console.error(resp.headers);
            console.error(resp.body);
            throw new Error(resp.body.error);
          }
        });
    },
    remove: function(data) {
      // console.info('Remove TXT', data);
      throw Error("removing TXT not implemented");
    },
    get: function(data) {
      // console.info('List TXT', data);
      throw Error("listing TXTs not implemented");
    }
  };

  return plugin;

  function api(opts) {
    //return auth.getToken(sa).then(function(token) {
    opts.headers = opts.headers || {};
    opts.headers.Authorization = "Bearer " + token;
    return request(opts).then(function(resp) {
      console.log(resp.headers);
      console.log(resp.body);
      return resp;
    });
    //});
  }

  function getZoneNameByDnsName(dnsZone) {
    return api({
      url: baseUrl + "/projects/" + sa.project_id + "/managedZones",
      json: true
    }).then(function(resp) {
      // Google Zone Name is NOT the DNS Name, but an arbitrary string
      return resp.body.managedZones.filter(function(zone) {
        return dnsZone + "." === zone.dnsName;
      })[0].name;
    });
  }

  function getServiceAccount(config) {
    var saPath =
      config.serviceAccountPath || process.env.GOOGLE_APPLICATION_CREDENTIALS;
    var sa = config.serviceAccount || require(saPath);

    if (
      !sa ||
      !(sa.private_key && sa.private_key_id && sa.client_email && sa.project_id)
    ) {
      throw new Error(
        "missing or incomplete service_account.json: set serviceAccount serviceAccountPath"
      );
    }
    return sa;
  }
};