/**
 * Gmap ArcGIS wrapper.
 */
function gmapArcgis(config) {
  /**
   * Extend Google Maps API.
   * See https://code.google.com/p/google-maps-extensions/source/browse/google.maps.Polygon.getBounds.js
   */
  if (!google.maps.Polygon.prototype.getBounds) {
    google.maps.Polygon.prototype.getBounds = function(latLng) {

      var bounds = new google.maps.LatLngBounds();
      var paths  = this.getPaths();
      var path;

      for (var p = 0; p < paths.getLength(); p++) {
        path = paths.getAt(p);
        for (var i = 0; i < path.getLength(); i++) {
          bounds.extend(path.getAt(i));
        }
      }

      return bounds;
    }
  }

  // Return a Gmap ArcGIS object
  return {
    // Storable properties
    config: config,
    map:    (config.map != undefined) ? config.map : null,

    // UI unblocker wrapper
    unblockUI: function(name) {
      if (window.blockUI == undefined) {
        window.blockUI = [ ];
      }

      if (name == undefined) {
        name = 'default';
      }

      if (window.blockUI[name] != undefined && window.blockUI[name] == true) {
        delete window.blockUI[name];
      }

      if (window.blockUI.length == 0) {
        jQuery.unblockUI();
      }
    },

    // UI blocker wrapper
    blockUI: function(params) {
      if (window.blockUI == undefined) {
        window.blockUI = [ ];
      }

      if (params.name == undefined) {
        params.name = 'default';
      }

      if (window.blockUI[params.name] == undefined || window.blockUI[params.name] != true) {
        window.blockUI[params.name] = true;
        jQuery.blockUI(params);
      }
    },

    // Block the UI and show an overlay
    showOverlay: function(name, timeout) {
      if (this.config.disableOverlay != undefined && this.config.disableOverlay == true) {
        return;
      }

      if ($.browser.msie === false || $.browser.msie === undefined) {
        message = this.config.overlayMessage;

        if (this.config.overlayCss != undefined) {
          css = this.config.overlayCss;
        }
        else {
          css = { };
        }

        var params = {
          name:            name,
          message:         message,
          css:             css,
        };

        if (timeout != false) {
          params.timeout = timeout;
        }

        this.blockUI(params);
      }
    },

    // Show overlay dependending on element configuration
    showOverlayIf: function(section, element) {
      if (this.config[section][element].overlayTime != undefined && this.config[section][element].overlayTime != false) {
        this.showOverlay(section + '_' + element, this.config[section][element].overlayTime);
      }
      else if (this.config[section][element].overlayTime != false) {
        this.showOverlay(section + '_' + element);
      }
    },

    // Count object properties
    countProperties: function(object) {
      // Doesn't work with IE8
      //return Object.keys(layers).length;

      var count = 0;

      for (value in object) {
        count++;
      }

      return count;
    },

    // Set the current map
    setMap: function(map) {
      if (map != undefined) {
        this.map = map;
        this.setCenter(map.getCenter());
      }
    },

    // Get the default opacity of a layer element
    defaultOpacity: function(element, store) {
      store = (store != undefined) ? store : 'layers';

      if (this.config[store][element] != undefined && this.config[store][element].opacity != undefined) {
        return this.config[store][element].opacity;
      }
      else {
        return 0.55;
      }
    },

    // Add polygons from a given ArcGIS MapServer Layer
    showPolygon: function(params, name) {
      var self       = this;
      params.service = new gmaps.ags.MapService(params['uri']);
      params.overlay = new gmaps.ags.MapOverlay(params.service, {
        exportOptions: {
          layerIds:         params['layers'],
          layerOption:      'show',
          layerDefinitions: (params['layerDefinitions'] != undefined) ? params['layerDefinitions'] : { },
        },
      });

      if (params.callback == undefined) {
        // Default callback: remove the blockUI once the layer is shown
        google.maps.event.addListener(params.overlay, 'drawend', function() {
          self.unblockUI(name);
        });
      }
      else {
        google.maps.event.addListener(params.overlay, 'drawend', function() {
          params.callback(this.map, params);
          self.unblockUI(name);
        });
      }

      params.overlay.setMap(this.map);
      params.overlay.setOpacity(params.opacity);

      this.identifyPolygon(params);

      return params.overlay;
    },

    // Add an identify callback to a layer
    identifyPolygon: function(params) {
      // See https://google-maps-utility-library-v3.googlecode.com/svn/trunk/arcgislink/examples/identify.js
      if (typeof params.identify != 'undefined') {
        var self = this;

        // Configure event listener
        params.identifyListener = google.maps.event.addListener(this.map, 'click', function(point) {
          params.identify.geometry = point.latLng;
          params.identify.bounds   = self.map.getBounds();
          params.identify.width    = self.map.getDiv().offsetWidth;
          params.identify.height   = self.map.getDiv().offsetHeight;

          // Configure infoWindow
          if (params.infowindow != undefined) {
            params.infowindow.close();
            params.infowindow.setContent('');
            params.infowindow.setPosition(point.latLng);
          }
          else {
            params.infowindow = new google.maps.InfoWindow({
              content:  '',
              position: point.latLng,
            });
          }

          // Identify layers
          params.service.identify(params.identify, function(identify, err) {
            if (!err) {
              var layers  = { };
              var result  = null;
              var layerId = null;

              // Sort results by layer
              for (var i in identify.results) {
                result  = identify.results[i];
                layerId = result.layerId;

                if (layers[layerId] == undefined) {
                  layers[layerId] = [ result ];
                }
                else {
                  layers[layerId].push(result);
                }
              }

              // Callback only if layers is not empty
              if (self.countProperties(layers) > 0) {
                params.identify.callback(layers, params.infowindow, err);
              }
            }
          });
        });
      }
    },

    // Add a KML to the map
    showKML: function(element) {
      if (typeof this.config['kmls'][element].overlay == 'undefined') {
        this.config['kmls'][element].overlay = new google.maps.KmlLayer(this.config['kmls'][element].uri);
      }

      this.config['kmls'][element].overlay.setMap(this.map);
      this.config['kmls'][element].isVisible = true;
      this.unblockUI('kmls_' + element);
    },

    // Add a KML layer into the map
    addKML: function(element) {
      if (typeof this.config['kmls'][element].overlay != 'undefined') {
        this.showKML(element);
        return;
      }

      this.showOverlayIf('kmls', element);
      this.showKML(element);
    },

    // Add a layer to the map
    addLayers: function(element) {
      this.config['layers'][element].opacity = this.defaultOpacity(element);

      if (typeof this.config['layers'][element].overlay != 'undefined') {
        if (this.config['layers'][element].overlay.setVisible != undefined) {
          this.config['layers'][element].overlay.setVisible(true);
          this.identifyPolygon(this.config['layers'][element]);
        }
        else if (this.config['layers'][element].overlay.setOpacity != undefined) {
          this.config['layers'][element].overlay.setOpacity(this.config['layers'][element].opacity);
          this.identifyPolygon(this.config['layers'][element]);
        }
        else if (this.config['layers'][element].overlay[0] != undefined) {
          for (i=0; i < this.config['layers'][element].overlay.length; i++) {
            this.config['layers'][element].overlay[i].setVisible(true);
          }
        }

        this.unblockUI('layers_' + element);
        return;
      }
    
      this.showOverlayIf('layers', element);
      this.config['layers'][element].overlay = this.showPolygon(this.config['layers'][element], 'layers_' + element);
    },

    // Add a slider layer in the map
    addSlider: function(layer, slider) {
      this.config['sliders'][slider].opacity  = this.defaultOpacity(layer, 'sliders');
      this.config['sliders'][slider].layers   = [layer];

      if (typeof this.config['sliders'][slider].overlays[layer] != 'undefined') {
        this.config['sliders'][slider].overlays[layer].setOpacity(this.config['sliders'][slider].opacity);
        this.unblockUI('sliders_' + slider);
      }

      this.showOverlayIf('sliders', slider);
      this.config['sliders'][slider].overlays[layer] = this.showPolygon(this.config['sliders'][slider], 'sliders_' + slider);
      this.sliderUpdateOpacity(layer, slider);
    },
    
    // Add makers to the map
    addMarkers: function(element) {
      var self = this;
    
      if (this.config['markers'][element].overlay != undefined) {
        this.toggleMarkers(element);
        return;
      } else {
        this.config['markers'][element].overlay = [];
      }
    
      this.showOverlayIf('markers', element);
    
      // Query parameters
      var query = {
        returnGeometry: true,
        geometry:       (this.config['markers'][element].bounds != undefined) ? this.config['markers'][element].bounds : undefined,
        where:          (this.config['markers'][element].where  != undefined) ? this.config['markers'][element].where  : '1=1',
        outFields:      this.config['markers'][element].fields,
      };
    
      var layer = new gmaps.ags.Layer(this.config['markers'][element].uri);
    
      // Configure infoWindow
      this.config['markers'][element].infowindow = new google.maps.InfoWindow({
        content: '',
      });
    
      // Execute query
      if (this.config['markers'][element].resultSetCallback != undefined) {
        layer.query(query, this.config['markers'][element].resultSetCallback);
      }
      else {
        layer.query(query, processResultSet);
      }

      // Process results
      function processResultSet(fset) {
        var fs = fset.features;
        var title;
        for (var i = 0, c = fs.length; i < c; i++) {
          var feature = fs[i];

          if (self.config['markers'][element].title != undefined) {
            title = feature.attributes[self.config['markers'][element].title];
          }
          else {
            title = feature.attributes.nome;
          }
    
          self.config['markers'][element].overlay[i] = {};
          self.config['markers'][element].overlay[i].marker = new google.maps.Marker({
            title:    title,
            icon:     self.config['markers'][element].icon,
            position: feature.geometry[0].getPosition(),
            map:      self.map,
          });
    
          // Use a closure so marker data remains available to the listeners
          self.config['markers'][element].overlay[i].addListener = function() {
            var marker     = self.config['markers'][element].overlay[i].marker;
            var infowindow = self.config['markers'][element].infowindow;
            var content    = self.config['markers'][element].content;
            var attributes = feature.attributes;
    
            google.maps.event.addListener(marker, 'click', function() {
              self.closeInfoWindows();
              infowindow.setContent(content(attributes));
              infowindow.open(self.map, marker);
            });
          };
    
          // Execute
          self.config['markers'][element].overlay[i].addListener();
        }
    
        self.unblockUI('markers_' + element);
      }
    },

    // Toggle KML visibility
    toggleKML: function(element) {
      if (this.config['kmls'][element].overlay == undefined) {
        return;
      } else if (this.config['kmls'][element].isVisible == true) {
        this.config['kmls'][element].isVisible = false;
        this.config['kmls'][element].overlay.setMap();
      } else {
        this.config['kmls'][element].isVisible = true;
        this.config['kmls'][element].overlay.setMap(this.map);
      }
    },
    
    // Toggle layer visibility
    toggleLayers: function(element) {
      if (this.config['layers'][element].overlay.setVisible != undefined) {
        var changeTo = !this.config['layers'][element].overlay.getVisible();
        this.config['layers'][element].overlay.setVisible(changeTo);
      }
      else if (this.config['layers'][element].overlay.setOpacity != undefined) {
        var opacity = this.config['layers'][element].overlay.getOpacity;

        if (opacity == 0) {
          opacity = this.config['layers'][element].opacity;
        }
        else {
          opacity = 0;
        }

        this.config['layers'][element].overlay.setOpacity(opacity);
      }
      else if (this.config['layers'][element].overlay[0] != undefined) {
        for (i=0; i < this.config['layers'][element].overlay.length; i++) {
          var changeTo = !this.config['layers'][element].overlay[i].getVisible();
          this.config['layers'][element].overlay[i].setVisible(changeTo);
        }
      }

      if (this.config['layers'][element].identifyListener != undefined) {
        google.maps.event.removeListener(this.config['layers'][element].identifyListener);
      }
    },
    
    // Toggle marker visibility
    toggleMarkers: function(element, raw) {
      var markers         = (raw == true) ? element : this.config['markers'][element].overlay;
      var closeInfoWindow = false;
    
      for (i=0; i < markers.length; i++) {
        if (markers[i].marker.getVisible()) {
          closeInfoWindow = true;
          markers[i].marker.setVisible(false);
        } else {
          markers[i].marker.setVisible(true);
        }
      }

      // Close the infoWindow
      if (closeInfoWindow == true && this.config['markers']                     != undefined
                                  && this.config['markers'][element]            != undefined
                                  && this.config['markers'][element].infowindow != undefined) {
        this.config['markers'][element].infowindow.close();
      }
    },

    // Change a element in the map
    changeElement: function(type, element, callback) {
      if (this.config[type][element] == undefined || this.config[type][element]['showOn'] == undefined) {
        return;
      }
    
      if (jQuery.inArray(this.config.mapName, this.config[type][element]['showOn']) != -1) {
        this[callback](element);
      }
    },
    
    // Display slider
    sliderUpdate: function(layer, slider) {
      if (this.config['sliders'][slider].overlays == undefined) {
        this.config['sliders'][slider].overlays = [ ];
      }

      if (this.config['sliders'][slider].overlays[layer] == undefined) {
        this.addSlider(layer, slider);
      }

      this.sliderUpdateOpacity(layer, slider);
    },

    // Fix slider opacity
    sliderUpdateOpacity: function(layer, slider) {
      for (var i in this.config['sliders'][slider].overlays) {
        if (i == layer) {
          this.config['sliders'][slider].overlays[i].setOpacity(this.defaultOpacity(slider, 'sliders'));
        }
        else {
          this.config['sliders'][slider].overlays[i].setOpacity(0);
        }
      }
    
      // The second and all subsequent layers shall be intialized without opacity.
      this.sliderOpacity = 0;
    },

    // jQuery slider wrapper
    slider: function(element, slider) {
      var self = this;
      var type = (self.config.sliders[slider].type != undefined) ? self.config.sliders[slider].type : 'slider';

      if (type == 'selectToUISlider') {
        $(element).selectToUISlider({
          sliderOptions: {
            slide: function(event, ui) {
              self.sliderUpdate.apply(self, [ ui.value - 1, slider ]);
            }
          }
        }).hide();
      }
      else {
        // Max is the number of layers in the service
        $(element).slider({
            value: 1,
            min:  -1,
            max:  11,
            step:  1,
            animate: true,
            change:  function(event, ui) {
              self.sliderUpdate.apply(self, [ ui.value, slider ]);
            },
        });
      }
    },

    // Show slider in the map
    showSlider: function(slider) {
      for (var i in this.config['sliders'][slider].overlays) {
        this.config['sliders'][slider].overlays[i].setMap(this.map);
      }
    },

    // Hide slider from the map
    hideSlider: function(slider) {
      for (var i in this.config['sliders'][slider].overlays) {
        this.config['sliders'][slider].overlays[i].setMap(null);
      }
    },

    /**
     * Returns the zoom level at which the given rectangular region fits in the map view.
     * The zoom level is computed for the currently selected map type.
     *
     * @param {google.maps.Map} map
     * @param {google.maps.LatLngBounds} bounds
     * @return {Number} zoom level
     * @see http://stackoverflow.com/questions/9837017/equivalent-of-getboundszoomlevel-in-gmaps-api-3
     */
    getZoomByBounds: function(bounds) {
      var map              = this.map;
      var MAX_ZOOM         = map.mapTypes.get(map.getMapTypeId()).maxZoom || 21;
      var MIN_ZOOM         = map.mapTypes.get(map.getMapTypeId()).minZoom || 0;
      var ne               = map.getProjection().fromLatLngToPoint(bounds.getNorthEast());
      var sw               = map.getProjection().fromLatLngToPoint(bounds.getSouthWest());
      var worldCoordWidth  = Math.abs(ne.x - sw.x);
      var worldCoordHeight = Math.abs(ne.y - sw.y);

      // Fit padding in pixels
      var FIT_PAD = 40;

      for (var zoom = MAX_ZOOM; zoom >= MIN_ZOOM; --zoom) {
        if (worldCoordWidth  * (1 << zoom) + 2 * FIT_PAD < $(map.getDiv()).width() &&
            worldCoordHeight * (1 << zoom) + 2 * FIT_PAD < $(map.getDiv()).height()) {
              return zoom;
            }
      }

      return 0;
    },

    // Show a polygon resulting from the given query
    showPolygonFromQuery: function(params, name) {
      var self         = this;
      var limit        = null;
      var layer        = new gmaps.ags.Layer(params.uri);
      var query        = {
        returnGeometry: true,
        geometryType:   'esriGeometryPolygon',
        where:          params.where,
        outFields:      '*',
        overlayOptions: (params.overlayOptions != undefined) ? params.overlayOptions : null,
      };

      layer.query(query, function(fset) {
        var fs         = fset.features;
        params.overlay = [];

        for (i in fs) {
          var feature       = fs[i];
          params.overlay[i] = feature.geometry[0];

          // Fit map to polygon bounds
          if (params.fitBounds != undefined && params.fitBounds == true) {
            var bounds = params.overlay[i].getBounds();

            // Join bounds together
            if (limit === null) {
              limit = bounds;
            }
            else {
              limit.union(bounds);
            }
          }

          // Show polygon
          params.overlay[i].setMap(self.map);

          // Forward all click events to the map
          // Somehow a polygon returned from a query is blocking all map clicks
          google.maps.event.addListener(params.overlay[i], 'click', function(point) {
            google.maps.event.trigger(self.map, 'click', point);
          });
        }

        // Fit map to limits
        if (params.fitBounds != undefined && params.fitBounds == true) {
          var zoom   = self.getZoomByBounds(limit);
          var center = limit.getCenter();
          self.map.setZoom(zoom);
          self.setCenter(center, true);
        }

        self.unblockUI(name);
        return params.overlay;
      });
    },

    // Show a polygon resulting from the given query in multiple layers
    showPolygonFromQueryMultiple: function (params, name, layers) {
      var self  = this;
      var max   = 2;
      var where = params.where;

      // Format where clause for ajax request
      where = where.replace(/=/g, '%3D');
      where = where.replace(/ /g, '+');

      // First find out in which layers there are results
      for (var n in layers) {
        var layer = n;
        var args  = jQuery.extend(true, {}, params);
        var url   = URL_ARCGIS_TIS + '/' + layer + '/query?where=' + where + '&f=pjson';

        // A closure here keeps the right layer to the async response
        (function(layer, args) {
          $.ajax({
            type: 'get',
            url: url,
            dataType: 'jsonp',
            success: function (response) {
              if (response.features != undefined && response.features.length != '0') {
                args.uri += '/' + layer;
                self.showPolygonFromQuery(args, name);
              }
            }
          });
        })(layer, args);
      }
    },

    // Close all registered infoWindows
    closeInfoWindows: function() {
      overlays = [ 'layers', 'markers' ];

      for (i in overlays) {
        var overlay = this.config[overlays[i]];

        for (element in overlay) {
          if (overlay[element].infowindow != undefined) {
            this.config[overlays[i]][element].infowindow.close();
          }
        }
      }
    },

    // Remove all loaded overlays
    cleanOverlays: function() {
      var overlays = [ 'layers', 'markers' ];

      for (i in overlays) {
        var overlay = this.config[overlays[i]];

        for (element in overlay) {
          if (overlay[element].infowindow != undefined) {
            delete this.config[overlays[i]][element].infowindow;
          }

          if (overlay[element].overlay != undefined) {
            delete this.config[overlays[i]][element].overlay;
          }
        }
      }
    },

    // Add panoramio layer
    addPanoramio: function() {
      if (this.config.panoramio.panoramioLayer == undefined) {
        var self = this;
        this.showOverlay('panoramio');

        var photoDiv                         = document.createElement('div');
        var photoWidgetOptions               = this.config.panoramio.photoWidgetOptions;
        this.config.panoramio                = { };
        this.config.panoramio.photoWidget    = new panoramio.PhotoWidget(photoDiv, null, photoWidgetOptions);
        this.config.panoramio.infoWindow     = new google.maps.InfoWindow();
        this.config.panoramio.panoramioLayer = new google.maps.panoramio.PanoramioLayer({
          suppressInfoWindows: true
        });

        google.maps.event.addListener(this.config.panoramio.panoramioLayer, 'click', function(e) {
          var photoRequestOptions = {
            ids: [{
              'photoId': e.featureDetails.photoId,
              'userId':  e.featureDetails.userId,
            }]
          };

          self.closeInfoWindows();
          self.config.panoramio.photoWidget.setRequest(photoRequestOptions);
          self.config.panoramio.photoWidget.setPosition(0);
          self.config.panoramio.infoWindow.setPosition(e.latLng);
          self.config.panoramio.infoWindow.open(self.map);
          self.config.panoramio.infoWindow.setContent(photoDiv);
        });
      }

      // See https://groups.google.com/forum/#!msg/panoramio-api/oQUJzcI-NM8/ARGPKppY33YJ
      panoramio.events.listen(this.config.panoramio.photoWidget, panoramio.events.EventType.PHOTO_CLICKED, photoClicked);

      function photoClicked(event) {
        var photo=event.getPhoto();

        if(photo){
          MaximizeWindow(window.open(photo.getPhotoUrl())); // opens a new window
        }

        function MaximizeWindow(hWnd){
          hWnd.moveTo(0,0);
          hWnd.resizeTo(screen.width, screen.height);
        }
      }

      this.unblockUI('panoramio');
    },

    // Set the current map center, optionally updating the map
    setCenter: function(latLng, update) {
      this.config.mapCenter = latLng;

      if (update != undefined && update == true) {
        this.updateCenter();
      }
    },

    // Update map center
    updateCenter: function() {
      this.map.setCenter(this.config.mapCenter);
    },
  }
};