var shortURLPromise
  , short = require('../lib/short');

// connect to mongodb
short.connect('mongodb://localhost/short');

short.connection.on('error', function(error) {
  throw new Error(error);
});

// promise to generate a shortened URL.
var shortURLPromise = short.generate({
  URL : 'http://nodejs.org/'
});

// gets back the short url document, and then retrieves it
shortURLPromise.then(function(mongodbDoc) {
  console.log('>> created short URL:');
  console.log(mongodbDoc);
  console.log('>> retrieving short URL: %s', mongodbDoc.hash);
  short.retrieve(mongodbDoc.hash).then(function(result) {
    console.log('>> retrieve result:');
    console.log(result);
    process.exit(0);
  }, function(error) {
    if (error) {
      throw new Error(error);
    }
  });
}, function(error) {
  if (error) {
    throw new Error(error);
  }
});

var listURLsPromise
  , short = require('../lib/short');

// connect to mongodb
short.connect('mongodb://localhost/short');

short.connection.on('error', function(error) {
  throw new Error(error);
});

// promise to retrieve all shortened URLs
listURLsPromise = short.list();

// output all resulting shortened url db docs
listURLsPromise.then(function(URLsDocument) {
  console.log('>> listing (%d) Shortened URLS:', URLsDocument.length);
  console.log(URLsDocument);
  process.exit(0);
}, function(error) {
  if (error) {
    throw new Error(error);
  }
});

// Basically, update works like this
var updatePromise = short.update(hash, updateData);
// hash => Short url hashcode generated using short.generate()
// updateData => An object consisting of the new URL and/or the new data object. 
//               If a key already exists in the current data object, it's value is updated, 
//               otherwise, it is added and saved to the data object

//This function returns a promise which on resolution returns the new updated object as an argument.

// The basic Initialisation, Connection, Short URL generation and 
// retrieval remains the same as depicted in previous examples

// the variable hash contains the short url hash code generated using short.generate()
var updatePromise = short.update(hash,{
  URL : 'http://www.youtube.com/watch?v=qvsgGtivCgs',
  data: {
    'type' : 'movie-trailer',
    'movie': 'Back To The Future'
  }
});
updatePromise.then(function(ShortURLObject) {
  console.log('New URL:', ShortURLObject.URL, '\nNew data:', ShortURLObject.data);
}, function(error) {
  console.log('Error', error);
});