'use strict';
var rp = require('request-promise');
var logger = require('log4js').getLogger();
var util = require('util');
var request = require('request');
var btoa = require('btoa');

var buildAuthentication = function() {
  var user = 'a-qz0da4-dfwwdkmkzr'; // Your actual username
  var pass = '9txJEf3Cjy7hkSOvkv'; // Your actual password
  var token = user.concat(':', pass);

  return 'Basic '.concat(btoa(token));
};

function getData(data, prev) {
  return new Promise(function(resolve, reject) {
    logger.debug('Working...');
    var range = '';

    if (data.hasOwnProperty('start')) {
      range = ['?start=', data.start, '&end=', data.end].join('');
    }

    if (data.hasOwnProperty('bookmark')) {

      range = range.concat(range.length > 0 ? '&' : '?');
      range = range.concat('_bookmark=',encodeURIComponent(data.bookmark));

    }

    var options = {
      uri: 'https://qz0da4.internetofthings.ibmcloud.com/api/v0002/historian/types/mDot/devices/' + data.id + range,
      headers: {
              Authorization: buildAuthentication()
            },
      json: true
    };

    logger.debug(options);

    // This is put together to get around the Paging that bluemix uses.
    // They limit the number of results to 100 per query
    // Kind of sloppy using the promises like this I think.

    rp(options)
        .then(function(d) {

              prev.events.concat(d.events);

              Array.prototype.push.apply(prev.events, d.events);

              if (d.hasOwnProperty('bookmark')) {
                data.bookmark = d.bookmark;
                getData(data, prev).then(function(d) {
                  resolve(d);
                });
              } else {
                logger.debug('Final resolve...');
                resolve(prev);
              }
            })
        .catch(function(err) {
          logger.error(err);
          reject(err);
        });
  });
}

var self = module.exports = {

  doGet: function(data) {
      return new Promise(function(resolve, reject) {
        logger.debug('Inside doGet Promise');
        logger.debug('About to query');

        getData(data,{events: []}).then(function(d) {
          resolve(d);
        }).catch(function(e) {
          logger.error(e);
          reject(e);
        });
      });
    }

};