var util = function() {

  $.fn.serializeObject = function() {
    var o = {};
    var a = this.serializeArray();
    $.each(a, function() {
      if (o[this.name]) {
        if (!o[this.name].push) {
          o[this.name] = [o[this.name]];
        }
        o[this.name].push(this.value || '');
      } else {
        o[this.name] = this.value || '';
      }
    });
    return o;
  };

  function inURL(url, str) {
    var exists = false;
    if ( url.indexOf( str ) > -1 ) {
      exists = true;
    }
    return exists;
  }
  
  function registerEmitter() {
    var Emitter = function(obj) {
      this.emit = function(obj, channel) { 
        if (!channel) var channel = 'data';
        this.trigger(channel, obj); 
      };
    };
    MicroEvent.mixin(Emitter);
    app.emitter = new Emitter();
  }
  
  function listenFor(keys) {
    _.each(keys, function(key) {
      $(document).bind('keydown', key, function() { app.emitter.emit(key, key) });
    })
  }
  
  function observeExit(elem, callback) {
    var cancelButton = elem.find('.cancelButton');
    app.emitter.on('esc', function() { 
      cancelButton.click();
      app.emitter.clear('esc');
    });
    cancelButton.click(callback);
  }
  
  function show( thing ) {
    $('.' + thing ).show();
    $('.' + thing + '-overlay').show();
  }

  function hide( thing ) {
    $('.' + thing ).hide();
    $('.' + thing + '-overlay').hide();
  }
  
  function position( thing, elem, offset ) {
    var position = $(elem.target).offset();
    if (offset) {
      if (offset.top) position.top += offset.top;
      if (offset.left) position.left += offset.left;
    }
    $('.' + thing + '-overlay').show().click(function(e) {
      $(e.target).hide();
      $('.' + thing).hide();
    });
    $('.' + thing).show().css({top: position.top + $(elem.target).height(), left: position.left});
  }

  function render( template, target, options ) {
    if ( !options ) options = {data: {}};
    if ( !options.data ) options = {data: options};
    var html = $.mustache( $( "." + template + "Template:first" ).html(), options.data );
    if (target instanceof jQuery) {
      var targetDom = target;
    } else {
      var targetDom = $( "." + target + ":first" );      
    }
    if( options.append ) {
      targetDom.append( html );
    } else {
      targetDom.html( html );
    }
    if (template in app.after) app.after[template]();
  }
  
  function notify( message, options ) {
    if (!options) var options = {};
    $('#notification-container').show();
    $('#notification-message').text(message);
    if (!options.loader) $('.notification-loader').hide();
    if (options.loader) $('.notification-loader').show();
    if (!options.persist) setTimeout(function() { $('#notification-container').hide() }, 3000);
  }

  function formatMetadata(data) {
    out = '<dl>';
    $.each(data, function(key, val) {
      if (typeof(val) == 'string' && key[0] != '_') {
        out = out + '<dt>' + key + '<dd>' + val;
      } else if (typeof(val) == 'object' && key != "geometry" && val != null) {
        if (key == 'properties') {
          $.each(val, function(attr, value){
            out = out + '<dt>' + attr + '<dd>' + value;
          })
        } else {
          out = out + '<dt>' + key + '<dd>' + val.join(', ');
        }
      }
    });
    out = out + '</dl>';
    return out;
  }

  function getBaseURL(url) {
    var baseURL = "";
    if ( inURL(url, '_design') ) {
      if (inURL(url, '_rewrite')) {
        var path = url.split("#")[0];
        if (path[path.length - 1] === "/") {
          baseURL = "";
        } else {
          baseURL = '_rewrite/';
        }
      } else {
        baseURL = '_rewrite/';
      }
    }
    return baseURL;
  }
  
  var persist = {
    restore: function() {
      $('.persist').each(function(i, el) {
        var inputId = $(el).attr('id');
        if(localStorage.getItem(inputId)) $('#' + inputId).val(localStorage.getItem(inputId));
      })
    },
    save: function(id) {
      localStorage.setItem(id, $('#' + id).val());
    },
    clear: function() {
      $('.persist').each(function(i, el) {
        localStorage.removeItem($(el).attr('id'));
      })
    }
  }
  
  // simple debounce adapted from underscore.js
  function delay(func, wait) {
    return function() {
      var context = this, args = arguments;
      var throttler = function() {
        delete app.timeout;
        func.apply(context, args);
      };
      if (!app.timeout) app.timeout = setTimeout(throttler, wait);      
    };
  };
  
  function resetForm(form) {
    $(':input', form)
     .not(':button, :submit, :reset, :hidden')
     .val('')
     .removeAttr('checked')
     .removeAttr('selected');
  }
  
  return {
    inURL: inURL,
    registerEmitter: registerEmitter,
    listenFor: listenFor,
    show: show,
    hide: hide,
    position: position,
    render: render,
    notify: notify,
    observeExit: observeExit,
    formatMetadata:formatMetadata,
    getBaseURL:getBaseURL,
    resetForm: resetForm,
    delay: delay,
    persist: persist
  };
}();