/*jshint multistr:true */

this.recline = this.recline || {};
this.recline.Util = this.recline.Util || {};

(function(my) {
// ## Miscellaneous Utilities

var urlPathRegex = /^([^?]+)(\?.*)?/;

// Parse the Hash section of a URL into path and query string
my.parseHashUrl = function(hashUrl) {
  var parsed = urlPathRegex.exec(hashUrl);
  if (parsed === null) {
    return {};
  } else {
    return {
      path: parsed[1],
      query: parsed[2] || ''
    };
  }
};

// Parse a URL query string (?xyz=abc...) into a dictionary.
my.parseQueryString = function(q) {
  if (!q) {
    return {};
  }
  var urlParams = {},
    e, d = function (s) {
      return unescape(s.replace(/\+/g, " "));
    },
    r = /([^&=]+)=?([^&]*)/g;

  if (q && q.length && q[0] === '?') {
    q = q.slice(1);
  }
  while (e = r.exec(q)) {
    // TODO: have values be array as query string allow repetition of keys
    urlParams[d(e[1])] = d(e[2]);
  }
  return urlParams;
};

// Parse the query string out of the URL hash
my.parseHashQueryString = function() {
  q = my.parseHashUrl(window.location.hash).query;
  return my.parseQueryString(q);
};

// Compse a Query String
my.composeQueryString = function(queryParams) {
  var queryString = '?';
  var items = [];
  $.each(queryParams, function(key, value) {
    if (typeof(value) === 'object') {
      value = JSON.stringify(value);
    }
    items.push(key + '=' + encodeURIComponent(value));
  });
  queryString += items.join('&');
  return queryString;
};

my.getNewHashForQueryString = function(queryParams) {
  var queryPart = my.composeQueryString(queryParams);
  if (window.location.hash) {
    // slice(1) to remove # at start
    return window.location.hash.split('?')[0].slice(1) + queryPart;
  } else {
    return queryPart;
  }
};

my.setHashQueryString = function(queryParams) {
  window.location.hash = my.getNewHashForQueryString(queryParams);
};
})(this.recline.Util);