/*
* LabeledMarker Class
*
* Copyright 2007 Mike Purvis (http://uwmike.com)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*       http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This class extends the Maps API's standard GMarker class with the ability
* to support markers with textual labels. Please see articles here:
*
*       http://googlemapsbook.com/2007/01/22/extending-gmarker/
*       http://googlemapsbook.com/2007/03/06/clickable-labeledmarker/
*/

/* Constructor */
function LabeledMarker(latlng, options){
    this.latlng = latlng;
    this.labelText = options.labelText || "";
    this.labelClass = options.labelClass || "markerLabel";
    this.labelOffset = options.labelOffset || new GSize(0, 0);

    this.clickable = options.clickable || true;

    if (options.draggable) {
    	// This version of LabeledMarker doesn't support dragging.
    	options.draggable = false;
    }

    GMarker.apply(this, arguments);
}


/* It's a limitation of JavaScript inheritance that we can't conveniently
   extend GMarker without having to run its constructor. In order for the
   constructor to run, it requires some dummy GLatLng. */
LabeledMarker.prototype = new GMarker(new GLatLng(0, 0));


// Creates the text div that goes over the marker.
LabeledMarker.prototype.initialize = function(map) {
	// Do the GMarker constructor first.
	GMarker.prototype.initialize.apply(this, arguments);

	var div = document.createElement("div");
	div.className = this.labelClass;
	div.innerHTML = this.labelText;
	div.style.position = "absolute";
	map.getPane(G_MAP_MARKER_PANE).appendChild(div);

	if (this.clickable) {
		// Pass through events fired on the text div to the marker.
		var eventPassthrus = ['click', 'dblclick', 'mousedown', 'mouseup', 'mouseover', 'mouseout'];
		for(var i = 0; i < eventPassthrus.length; i++) {
			var name = eventPassthrus[i];
			GEvent.addDomListener(div, name, newEventPassthru(this, name));
		}

		// Mouseover behaviour for the cursor.
		div.style.cursor = "pointer";
	}

	this.map = map;
	this.div = div;
}

function newEventPassthru(obj, event) {
	return function() {
		GEvent.trigger(obj, event);
	};
}

// Redraw the rectangle based on the current projection and zoom level
LabeledMarker.prototype.redraw = function(force) {
	GMarker.prototype.redraw.apply(this, arguments);

	// We only need to do anything if the coordinate system has changed
	if (!force) return;

	// Calculate the DIV coordinates of two opposite corners of our bounds to
	// get the size and position of our rectangle
	var p = this.map.fromLatLngToDivPixel(this.latlng);
	var z = GOverlay.getZIndex(this.latlng.lat());

	// Now position our DIV based on the DIV coordinates of our bounds
	this.div.style.left = (p.x + this.labelOffset.width) + "px";
	this.div.style.top = (p.y + this.labelOffset.height) + "px";
	this.div.style.zIndex = z + 1; // in front of the marker
}

// Remove the main DIV from the map pane, destroy event handlers
LabeledMarker.prototype.remove = function() {
	GEvent.clearInstanceListeners(this.div);
	this.div.parentNode.removeChild(this.div);
	this.div = null;
	GMarker.prototype.remove.apply(this, arguments);
}

/*
ClusterMarker Version 1.3.1 modified to make compatible with GMarker show() and hide() methods

A marker manager for the Google Maps API
http://googlemapsapi.martinpearman.co.uk/clustermarker

Copyright Martin Pearman 2008
Last updated 4th September 2008

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

function ClusterMarker($map, $options){
	this._map=$map;
	this._mapMarkers=[];
	this._iconBounds=[];
	this._clusterMarkers=[];
	this._eventListeners=[];
	if(typeof($options)==='undefined'){
		$options={};
	}
	this.borderPadding=($options.borderPadding)?$options.borderPadding:256;
	this.clusteringEnabled=($options.clusteringEnabled===false)?false:true;
	if($options.clusterMarkerClick){
		this.clusterMarkerClick=$options.clusterMarkerClick;
	}
	if($options.clusterMarkerMouseOver){
		this.clusterMarkerMouseOver=$options.clusterMarkerMouseOver;
	}
	if($options.clusterMarkerMouseOut){
		this.clusterMarkerMouseOut=$options.clusterMarkerMouseOut;
	}
        if($options.clusterMarkerRemove){
		this.clusterMarkerRemove=$options.clusterMarkerRemove;
	}
	if($options.clusterMarkerIcon){
		this.clusterMarkerIcon=$options.clusterMarkerIcon;
	}else{
		this.clusterMarkerIcon=new GIcon();
		this.clusterMarkerIcon.image='http://maps.google.com/mapfiles/arrow.png';
		this.clusterMarkerIcon.iconSize=new GSize(39, 34);
		this.clusterMarkerIcon.iconAnchor=new GPoint(9, 31);
		this.clusterMarkerIcon.infoWindowAnchor=new GPoint(9, 31);
		this.clusterMarkerIcon.shadow='http://www.google.com/intl/en_us/mapfiles/arrowshadow.png';
		this.clusterMarkerIcon.shadowSize=new GSize(39, 34);
	}
        this.showToolTips=($options.showToolTips===false)?false:true;
	this.clusterMarkerTitle=($options.clusterMarkerTitle)?$options.clusterMarkerTitle:'Click to zoom in and see %count markers';
	if($options.fitMapMaxZoom){
		this.fitMapMaxZoom=$options.fitMapMaxZoom;
	}
	this.intersectPadding=($options.intersectPadding)?$options.intersectPadding:0;
	if($options.markers){
		this.addMarkers($options.markers);
	}
	GEvent.bind(this._map, 'moveend', this, this._moveEnd);
	GEvent.bind(this._map, 'zoomend', this, this._zoomEnd);
	GEvent.bind(this._map, 'maptypechanged', this, this._mapTypeChanged);
}

ClusterMarker.prototype.addMarkers=function($markers){
	var i;
	if(!$markers[0]){
		//	assume $markers is an associative array and convert to a numerically indexed array
		var $numArray=[];
		for(i in $markers){
			$numArray.push($markers[i]);
		}
		$markers=$numArray;
	}
	for(i=$markers.length-1; i>=0; i--){
		$markers[i]._isVisible=true;	//	set isVisible to true as markers already added to map
		$markers[i]._isActive=false;
		$markers[i]._makeVisible=false;
	}
	this._mapMarkers=this._mapMarkers.concat($markers);
};

ClusterMarker.prototype._clusterMarker=function($clusterGroupIndexes){
	function $newClusterMarker($location, $num, $icon, $title){
		return new LabeledMarker($location, {icon:$icon, labelText:"" + $num, title:$title});
	}
	var $clusterGroupBounds=new GLatLngBounds(), i, $clusterMarker, $clusteredMarkers=[], $marker, $this=this, $mapMarkers=this._mapMarkers;
	for(i=$clusterGroupIndexes.length-1; i>=0; i--){
		$marker=$mapMarkers[$clusterGroupIndexes[i]];
		$marker.index=$clusterGroupIndexes[i];
		$clusterGroupBounds.extend($marker.getLatLng());
		$clusteredMarkers.push($marker);
	}
	$clusterMarker=$newClusterMarker($clusterGroupBounds.getCenter(), $clusterGroupIndexes.length, this.clusterMarkerIcon, (this.showToolTips?this.clusterMarkerTitle.replace(/%count/gi, $clusterGroupIndexes.length):null));
	$clusterMarker.clusterGroupBounds=$clusterGroupBounds;	//	only req'd for default cluster marker click action
	this._eventListeners.push(GEvent.addListener($clusterMarker, 'click', function(){
		$this.clusterMarkerClick({clusterMarker:$clusterMarker, clusteredMarkers:$clusteredMarkers });
	}));
        if ($this.clusterMarkerMouseOver) {
            this._eventListeners.push(GEvent.addListener($clusterMarker, 'mouseover', function(){
                    $this.clusterMarkerMouseOver({clusterMarker:$clusterMarker, clusteredMarkers:$clusteredMarkers });
            }));           
        }
        if ($this.clusterMarkerMouseOut) {
            this._eventListeners.push(GEvent.addListener($clusterMarker, 'mouseout', function(){
                    $this.clusterMarkerMouseOut({clusterMarker:$clusterMarker, clusteredMarkers:$clusteredMarkers });
            }));
        }
        if ($this.clusterMarkerRemove) {
            this._eventListeners.push(GEvent.addListener($clusterMarker, 'remove', function(){
                    $this.clusterMarkerRemove({clusterMarker:$clusterMarker, clusteredMarkers:$clusteredMarkers });
            }));
        }
	$clusterMarker._childIndexes=$clusterGroupIndexes;
	for(i=$clusterGroupIndexes.length-1; i>=0; i--){
		$mapMarkers[$clusterGroupIndexes[i]]._parentCluster=$clusterMarker;
	}
	return $clusterMarker;
};

ClusterMarker.prototype.clusterMarkerClick=function($args){
	this._map.setCenter($args.clusterMarker.getLatLng(), this._map.getBoundsZoomLevel($args.clusterMarker.clusterGroupBounds));
};

//	filterActiveMarkers() updated to check each marker's isHidden() method
//	if a marker's isHidden() method returns true then that marker is not considered to be active or in need of clustering
ClusterMarker.prototype._filterActiveMapMarkers=function(){
	var $borderPadding=this.borderPadding, $mapZoomLevel=this._map.getZoom(), $mapProjection=this._map.getCurrentMapType().getProjection(), $mapPointSw, $activeAreaPointSw, $activeAreaLatLngSw, $mapPointNe, $activeAreaPointNe, $activeAreaLatLngNe, $activeAreaBounds=this._map.getBounds(), i, $marker, $uncachedIconBoundsIndexes=[], $oldState, $mapMarkers=this._mapMarkers, $iconBounds=this._iconBounds;
	if($borderPadding){
		$mapPointSw=$mapProjection.fromLatLngToPixel($activeAreaBounds.getSouthWest(), $mapZoomLevel);
		$activeAreaPointSw=new GPoint($mapPointSw.x-$borderPadding, $mapPointSw.y+$borderPadding);
		$activeAreaLatLngSw=$mapProjection.fromPixelToLatLng($activeAreaPointSw, $mapZoomLevel);
		$mapPointNe=$mapProjection.fromLatLngToPixel($activeAreaBounds.getNorthEast(), $mapZoomLevel);
		$activeAreaPointNe=new GPoint($mapPointNe.x+$borderPadding, $mapPointNe.y-$borderPadding);
		$activeAreaLatLngNe=$mapProjection.fromPixelToLatLng($activeAreaPointNe, $mapZoomLevel);
		$activeAreaBounds.extend($activeAreaLatLngSw);
		$activeAreaBounds.extend($activeAreaLatLngNe);
	}
	this._activeMarkersChanged=false;
	if(typeof($iconBounds[$mapZoomLevel])==='undefined'){
		//	no iconBounds cached for this zoom level
		//	no need to check for existence of individual iconBounds elements
		this._iconBounds[$mapZoomLevel]=[];
		this._activeMarkersChanged=true;	//	force refresh(true) as zoomed to uncached zoom level
		for(i=$mapMarkers.length-1; i>=0; i--){
			$marker=$mapMarkers[i];
			$marker._isActive=($activeAreaBounds.containsLatLng($marker.getLatLng()) && !$marker.isHidden())?true:false;	//	new code
			//	GLog.write('Marker index: '+i+', $marker.isHidden(): '+$marker.isHidden());
			$marker._makeVisible=$marker._isActive;
			if($marker._isActive){
				$uncachedIconBoundsIndexes.push(i);
			}
		}
	}else{
		//	icondBounds array exists for this zoom level
		//	check for existence of individual iconBounds elements
		for(i=$mapMarkers.length-1; i>=0; i--){
			$marker=$mapMarkers[i];
			$oldState=$marker._isActive;
			$marker._isActive=($activeAreaBounds.containsLatLng($marker.getLatLng()) && !$marker.isHidden())?true:false;	//	new code
			//	GLog.write('Marker index: '+i+', $marker.isHidden(): '+$marker.isHidden());
			$marker._makeVisible=$marker._isActive;
			if(!this._activeMarkersChanged && $oldState!==$marker._isActive){
				this._activeMarkersChanged=true;
			}
			if($marker._isActive && typeof($iconBounds[$mapZoomLevel][i])==='undefined'){
				$uncachedIconBoundsIndexes.push(i);
			}
		}
	}
	return $uncachedIconBoundsIndexes;
};

ClusterMarker.prototype._filterIntersectingMapMarkers=function(){
	var $clusterGroup, i, j, $mapZoomLevel=this._map.getZoom(), $mapMarkers=this._mapMarkers, $iconBounds=this._iconBounds;
	for(i=$mapMarkers.length-1; i>0; i--)
	{
		if($mapMarkers[i]._makeVisible){
			$clusterGroup=[];
			for(j=i-1; j>=0; j--){
				if($mapMarkers[j]._makeVisible && $iconBounds[$mapZoomLevel][i].intersects($iconBounds[$mapZoomLevel][j])){
					$clusterGroup.push(j);
				}
			}
			if($clusterGroup.length!==0){
				$clusterGroup.push(i);
				for(j=$clusterGroup.length-1; j>=0; j--){
					$mapMarkers[$clusterGroup[j]]._makeVisible=false;
				}
				this._clusterMarkers.push(this._clusterMarker($clusterGroup));
			}
		}
	}
};

ClusterMarker.prototype.fitMapToMarkers=function(){
	var $mapMarkers=this._mapMarkers, $markersBounds=new GLatLngBounds(), i;
	for(i=$mapMarkers.length-1; i>=0; i--){
		$markersBounds.extend($mapMarkers[i].getLatLng());
	}
	var $fitMapToMarkersZoom=this._map.getBoundsZoomLevel($markersBounds);

	if(this.fitMapMaxZoom && $fitMapToMarkersZoom>this.fitMapMaxZoom){
		$fitMapToMarkersZoom=this.fitMapMaxZoom;
	}
	this._map.setCenter($markersBounds.getCenter(), $fitMapToMarkersZoom);
	this.refresh();
};

ClusterMarker.prototype._mapTypeChanged=function(){
	this.refresh(true);
};

ClusterMarker.prototype._moveEnd=function(){
	if(!this._cancelMoveEnd){
		this.refresh();
	}else{
		this._cancelMoveEnd=false;
	}
};

ClusterMarker.prototype._preCacheIconBounds=function($indexes, $mapZoomLevel){
	var $mapProjection=this._map.getCurrentMapType().getProjection(), i, $marker, $iconSize, $iconAnchorPoint, $iconAnchorPointOffset, $iconBoundsPointSw, $iconBoundsPointNe, $iconBoundsLatLngSw, $iconBoundsLatLngNe, $intersectPadding=this.intersectPadding, $mapMarkers=this._mapMarkers;
	for(i=$indexes.length-1; i>=0; i--){
		$marker=$mapMarkers[$indexes[i]];
		$iconSize=$marker.getIcon().iconSize;
		$iconAnchorPoint=$mapProjection.fromLatLngToPixel($marker.getLatLng(), $mapZoomLevel);
		$iconAnchorPointOffset=$marker.getIcon().iconAnchor;
		$iconBoundsPointSw=new GPoint($iconAnchorPoint.x-$iconAnchorPointOffset.x-$intersectPadding, $iconAnchorPoint.y-$iconAnchorPointOffset.y+$iconSize.height+$intersectPadding);
		$iconBoundsPointNe=new GPoint($iconAnchorPoint.x-$iconAnchorPointOffset.x+$iconSize.width+$intersectPadding, $iconAnchorPoint.y-$iconAnchorPointOffset.y-$intersectPadding);
		$iconBoundsLatLngSw=$mapProjection.fromPixelToLatLng($iconBoundsPointSw, $mapZoomLevel);
		$iconBoundsLatLngNe=$mapProjection.fromPixelToLatLng($iconBoundsPointNe, $mapZoomLevel);
		this._iconBounds[$mapZoomLevel][$indexes[i]]=new GLatLngBounds($iconBoundsLatLngSw, $iconBoundsLatLngNe);
	}
};

ClusterMarker.prototype.refresh=function($forceFullRefresh){
	var i, $marker, $zoomLevel=this._map.getZoom(), $uncachedIconBoundsIndexes=this._filterActiveMapMarkers();
	if(this._activeMarkersChanged || $forceFullRefresh){
		this._removeClusterMarkers();
		if(this.clusteringEnabled && $zoomLevel<this._map.getCurrentMapType().getMaximumResolution()){
			if($uncachedIconBoundsIndexes.length>0){
				this._preCacheIconBounds($uncachedIconBoundsIndexes, $zoomLevel);
			}
			this._filterIntersectingMapMarkers();
		}
		for(i=this._clusterMarkers.length-1; i>=0; i--){
			this._map.addOverlay(this._clusterMarkers[i]);
		}
		for(i=this._mapMarkers.length-1; i>=0; i--){
			$marker=this._mapMarkers[i];
			if(!$marker._isVisible && $marker._makeVisible){
				this._map.addOverlay($marker);
				$marker._isVisible=true;
			}
			if($marker._isVisible && !$marker._makeVisible){
				this._map.removeOverlay($marker);
				$marker._isVisible=false;
			}
		}
	}
};

ClusterMarker.prototype._removeClusterMarkers=function(){
	var i, j, $map=this._map, $eventListeners=this._eventListeners, $clusterMarkers=this._clusterMarkers, $childIndexes, $mapMarkers=this._mapMarkers;
	for(i=$clusterMarkers.length-1; i>=0; i--){
		$childIndexes=$clusterMarkers[i]._childIndexes;
		for(j=$childIndexes.length-1; j>=0; j--){
			delete $mapMarkers[$childIndexes[j]]._parentCluster;
		}
		$map.removeOverlay($clusterMarkers[i]);
	}
	for(i=$eventListeners.length-1; i>=0; i--){
		GEvent.removeListener($eventListeners[i]);
	}
	this._clusterMarkers=[];
	this._eventListeners=[];
};

ClusterMarker.prototype.removeMarkers=function(){
	var i, $mapMarkers=this._mapMarkers, $map=this._map;
	for(i=$mapMarkers.length-1; i>=0; i--){
		if($mapMarkers[i]._isVisible){
			$map.removeOverlay($mapMarkers[i]);
		}
		delete $mapMarkers[i]._isVisible;
		delete $mapMarkers[i]._isActive;
		delete $mapMarkers[i]._makeVisible;
	}
	this._removeClusterMarkers();
	this._mapMarkers=[];
	this._iconBounds=[];
};

ClusterMarker.prototype.triggerClick=function($index){
	var $marker=this._mapMarkers[$index];
	if($marker._isVisible){
		//	$marker is visible
		GEvent.trigger($marker, 'click');
	}
	else if($marker._isActive){
		//	$marker is clustered
		var $intersectingMarkerIndexes=$marker._parentCluster._childIndexes, $intersectDetected, $uncachedIconBoundsIndexes, i, j, $mapZoomLevel=this._map.getZoom();
		do{
			$intersectDetected=false;
			$mapZoomLevel++;
			if(typeof(this._iconBounds[$mapZoomLevel])==='undefined'){
				//	no iconBounds cached for this zoom level
				//	no need to check for existence of individual iconBounds elements
				this._iconBounds[$mapZoomLevel]=[];
				// need to create cache for all clustered markers at $mapZoomLevel
				this._preCacheIconBounds($intersectingMarkerIndexes, $mapZoomLevel);
			}else{
				//	iconBounds array exists for this zoom level
				//	check for existence of individual iconBounds elements
				$uncachedIconBoundsIndexes=[];
				for(j=$intersectingMarkerIndexes.length-1; j>=0; j--){
					if(typeof(this._iconBounds[$mapZoomLevel][$intersectingMarkerIndexes[j]]==='undefined')){
						$uncachedIconBoundsIndexes.push($intersectingMarkerIndexes[j]);
					}
				}
				if($uncachedIconBoundsIndexes.length>=1){
					this._preCacheIconBounds($uncachedIconBoundsIndexes, $mapZoomLevel);
				}
			}
			for(i=$intersectingMarkerIndexes.length-1; i>=0; i--){
				if($intersectingMarkerIndexes[i]!==$index && this._iconBounds[$mapZoomLevel][$intersectingMarkerIndexes[i]].intersects(this._iconBounds[$mapZoomLevel][$index])){	//	don't check that clustered marker intersects itself
					$intersectDetected=true;
					break;
				}
			}

		}
		while($intersectDetected && $mapZoomLevel<this._map.getCurrentMapType().getMaximumResolution());
		this._map.setCenter($marker.getLatLng(), $mapZoomLevel);
		this.triggerClick($index);
	}else{
		// $marker is not within active area (map bounds + border padding)
		this._map.setCenter($marker.getLatLng());
		this.triggerClick($index);
	}
};

ClusterMarker.prototype._zoomEnd=function(){
	this._cancelMoveEnd=true;
	this.refresh(true);
};