// Clusterer.js - marker clustering routines for Google Maps apps
//
// Using these routines is very easy.
//
// 1) Load the routines into your code:
//
//        <script src="http://www.acme.com/javascript/Clusterer.js" type="text/javascript"></script>
//
// 2) Create a Clusterer object, passing it your map object:
//
//        var clusterer = new Clusterer( map );
//
// 3) Wherever you now do map.addOverlay( marker ), instead call
//    clusterer.AddMarker( marker, title ).  The title is just a
//    short descriptive string to use in the cluster info-boxes.
//
// 4) If you are doing any map.removeOverlay( marker ) calls, change those
//    to clusterer.RemoveMarker( marker ).
//
// That's it!  Everything else happens automatically.
//
//
// The current version of this code is always available at:
// http://www.acme.com/javascript/
//
//
// Copyright © 2005,2006 by Jef Poskanzer <jef@mail.acme.com>.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
// For commentary on this license please see http://www.acme.com/license.html
// TZR update
// - save maplisteners as instance properties
// - unregister malistener when changing clusterer
// - bogus ? addMarkers dot not set GMarker::inCluster to false
// Constructor.
Clusterer = function ( map )
    {
      // TZR pour pouvoir detruire 
      this.zoomEndListener = null;
      this.moveEndListener = null;
      this.infoWindowCloseListener = null;
      this.map = map;
      this.markers = [];
      this.clusters = [];
      this.timeout = null;
      this.currentZoomLevel = map.getZoom();
      
      this.maxVisibleMarkers = Clusterer.defaultMaxVisibleMarkers;
      this.gridSize = Clusterer.defaultGridSize;
      this.minMarkersPerCluster = Clusterer.defaultMinMarkersPerCluster;
      this.maxLinesPerInfoBox = Clusterer.defaultMaxLinesPerInfoBox;
      this.icon = Clusterer.defaultIcon;
      
      this.zoomEndListener = GEvent.addListener( map, 'zoomend', Clusterer.MakeCaller( Clusterer.Display, this ) );
      this.moveEndListener = GEvent.addListener( map, 'moveend', Clusterer.MakeCaller( Clusterer.Display, this ) );
      this.infoWindowCloseListener = GEvent.addListener( map, 'infowindowclose', Clusterer.MakeCaller( Clusterer.PopDown, this ) );
    };

Clusterer.defaultMaxVisibleMarkers = 150;
Clusterer.defaultGridSize = 5;
Clusterer.defaultMinMarkersPerCluster = 5;
Clusterer.defaultMaxLinesPerInfoBox = 10;

Clusterer.defaultIcon = new GIcon();
Clusterer.defaultIcon.image = '';
Clusterer.defaultIcon.shadow = '';
Clusterer.defaultIcon.iconSize = new GSize( 30, 51 );
Clusterer.defaultIcon.shadowSize = new GSize( 56, 51 );
Clusterer.defaultIcon.iconAnchor = new GPoint( 15, 51);
Clusterer.defaultIcon.infoWindowAnchor = new GPoint( 15, 51 );
Clusterer.defaultIcon.infoShadowAnchor = new GPoint( 15, 51 );

// TZR : detruire un Clusterer  
Clusterer.prototype.unregister = function(){
  GEvent.removeListener(this.moveEndListener);
  GEvent.removeListener(this.zoomEndListener);
  GEvent.removeListener(this.infoWindowCloseListener);
};
// Call this to change the cluster icon.
Clusterer.prototype.SetIcon = function ( icon )
    {
    this.icon = icon;
    };


// Changes the maximum number of visible markers before clustering kicks in.
Clusterer.prototype.SetMaxVisibleMarkers = function ( n )
    {
    this.maxVisibleMarkers = n;
    };


// Sets the minumum number of markers for a cluster.
Clusterer.prototype.SetMinMarkersPerCluster = function ( n )
    {
    this.minMarkersPerCluster = n;
    };


// Sets the maximum number of lines in an info box.
Clusterer.prototype.SetMaxLinesPerInfoBox = function ( n )
    {
    this.maxLinesPerInfoBox = n;
    };


// Call this to add a marker.
Clusterer.prototype.AddMarker = function ( marker, title )
    {
    if ( marker.setMap != null )
	marker.setMap( this.map );
    // reset marker porperties 
    marker.title = title;
    marker.onMap = false;
    marker.inCluster = false;
    this.markers.push( marker );
    this.DisplayLater();
    };


// Call this to remove a marker.
Clusterer.prototype.RemoveMarker = function ( marker )
    {
    for ( var i = 0; i < this.markers.length; ++i )
	if ( this.markers[i] == marker )
	    {
	    if ( marker.onMap )
		this.map.removeOverlay( marker );
	    for ( var j = 0; j < this.clusters.length; ++j )
		{
		var cluster = this.clusters[j];
		if ( cluster != null )
		    {
		    for ( var k = 0; k < cluster.markers.length; ++k )
			if ( cluster.markers[k] == marker )
			    {
			    cluster.markers[k] = null;
			    --cluster.markerCount;
			    break;
			    }
		    if ( cluster.markerCount == 0 )
			{
			this.ClearCluster( cluster );
			this.clusters[j] = null;
			}
		    else if ( cluster == this.poppedUpCluster )
			Clusterer.RePop( this );
		    }
		}
	    this.markers[i] = null;
	    break;
	    }
    this.DisplayLater();
    };


Clusterer.prototype.DisplayLater = function ()
    {
    if ( this.timeout != null )
	clearTimeout( this.timeout );
    this.timeout = setTimeout( Clusterer.MakeCaller( Clusterer.Display, this ), 50 );
    };


Clusterer.Display = function ( clusterer )
    {
    var i, j, marker, cluster;

    clearTimeout( clusterer.timeout );

    var newZoomLevel = clusterer.map.getZoom();
    if ( newZoomLevel != clusterer.currentZoomLevel )
	{
	// When the zoom level changes, we have to remove all the clusters.
	for ( i = 0; i < clusterer.clusters.length; ++i )
	    if ( clusterer.clusters[i] != null )
		{
		clusterer.ClearCluster( clusterer.clusters[i] );
		clusterer.clusters[i] = null;
		}
	clusterer.clusters.length = 0;
	clusterer.currentZoomLevel = newZoomLevel;
	}

    // Get the current bounds of the visible area.
    var bounds = clusterer.map.getBounds();

    // Expand the bounds a little, so things look smoother when scrolling
    // by small amounts.
    var sw = bounds.getSouthWest();
    var ne = bounds.getNorthEast();
    var dx = ne.lng() - sw.lng();
    var dy = ne.lat() - sw.lat();
    if ( dx < 300 && dy < 150 ) 
    { 
	dx *= 0.10;
	dy *= 0.10;
	bounds = new GLatLngBounds(
	  new GLatLng( sw.lat() - dy, sw.lng() - dx ),
	  new GLatLng( ne.lat() + dy, ne.lng() + dx ) );
	}

    // Partition the markers into visible and non-visible lists.
    var visibleMarkers = [];
    var nonvisibleMarkers = [];

    for ( i = 0; i < clusterer.markers.length; ++i )
	{
	marker = clusterer.markers[i];
	if ( marker != null )
	    if ( bounds.contains( marker.getPoint() ) )
		visibleMarkers.push( marker );
	    else
		nonvisibleMarkers.push( marker );
	}

    // Take down the non-visible markers.
    for ( i = 0; i < nonvisibleMarkers.length; ++i )
	{
	marker = nonvisibleMarkers[i];
	if ( marker.onMap )
	    {
	    clusterer.map.removeOverlay( marker );
	    marker.onMap = false;
	    }
	}

    // Take down the non-visible clusters.
    for ( i = 0; i < clusterer.clusters.length; ++i )
	{
	cluster = clusterer.clusters[i];
	if ( cluster != null && ! bounds.contains( cluster.marker.getPoint() ) && cluster.onMap )
	    {
	    clusterer.map.removeOverlay( cluster.marker );
	    cluster.onMap = false;
	    }
	}

    // Clustering!  This is some complicated stuff.  We have three goals
    // here.  One, limit the number of markers & clusters displayed, so the
    // maps code doesn't slow to a crawl.  Two, when possible keep existing
    // clusters instead of replacing them with new ones, so that the app pans
    // better.  And three, of course, be CPU and memory efficient.
    if ( visibleMarkers.length > clusterer.maxVisibleMarkers )
    {
      // Add to the list of clusters by splitting up the current bounds
      // into a grid.
      var latRange = bounds.getNorthEast().lat() - bounds.getSouthWest().lat();
      var latInc = latRange / clusterer.gridSize;
      var lngInc = latInc / Math.cos( ( bounds.getNorthEast().lat() + bounds.getSouthWest().lat() ) / 2.0 * Math.PI / 180.0 );
      for ( var lat = bounds.getSouthWest().lat(); lat <= bounds.getNorthEast().lat(); lat += latInc ){
	for ( var lng = bounds.getSouthWest().lng(); lng <= bounds.getNorthEast().lng(); lng += lngInc )
	  {
	    cluster = new Object();
	    cluster.clusterer = clusterer;
	    cluster.bounds = new GLatLngBounds( new GLatLng( lat, lng ), new GLatLng( lat + latInc, lng + lngInc ) );
	    cluster.markers = [];
	    cluster.markerCount = 0;
	    cluster.onMap = false;
	    cluster.marker = null;
	    clusterer.clusters.push( cluster );
	  }
      }
      
      // Put all the unclustered visible markers into a cluster - the first
      // one it fits in, which favors pre-existing clusters.
      for ( i = 0; i < visibleMarkers.length; ++i )
      {
	marker = visibleMarkers[i];
	if ( marker != null && ! marker.inCluster )
	{
	  for ( j = 0; j < clusterer.clusters.length; ++j )
	    {
	      cluster = clusterer.clusters[j];
	      if ( cluster != null && cluster.bounds.contains( marker.getPoint() ) )
		{
		  cluster.markers.push( marker );
		  ++cluster.markerCount;
		  marker.inCluster = true;
		}
	    }
	}
      }

      // Get rid of any clusters containing only a few markers.
      for ( i = 0; i < clusterer.clusters.length; ++i )
      if ( clusterer.clusters[i] != null && clusterer.clusters[i].markerCount < clusterer.minMarkersPerCluster )
      {
	clusterer.ClearCluster( clusterer.clusters[i] );
	clusterer.clusters[i] = null;
      }
      
      // Shrink the clusters list.
      for ( i = clusterer.clusters.length - 1; i >= 0; --i )
      if ( clusterer.clusters[i] != null )
      break;
      else
      --clusterer.clusters.length;
      
      // Ok, we have our clusters.  Go through the markers in each
      // cluster and remove them from the map if they are currently up.
      for ( i = 0; i < clusterer.clusters.length; ++i )
      {
	cluster = clusterer.clusters[i];
	if ( cluster != null )
	  {
	    for ( j = 0; j < cluster.markers.length; ++j )
	      {
		marker = cluster.markers[j];
		if ( marker != null && marker.onMap )
		  {
		    clusterer.map.removeOverlay( marker );
		    marker.onMap = false;
		  }
	      }
	  }
      }
      
      // Now make cluster-markers for any clusters that need one.
      for ( i = 0; i < clusterer.clusters.length; ++i )
      {
	cluster = clusterer.clusters[i];
	if ( cluster != null && cluster.marker == null )
	{
	  // Figure out the average coordinates of the markers in this
	  // cluster.
	  var xTotal = 0.0, yTotal = 0.0;
	  for ( j = 0; j < cluster.markers.length; ++j )
	    {
	      marker = cluster.markers[j];
	      if ( marker != null )
		{
		  xTotal += ( + marker.getPoint().lng() );
		  yTotal += ( + marker.getPoint().lat() );
		}
	    }
	  var location = new GLatLng( yTotal / cluster.markerCount, xTotal / cluster.markerCount );
	  var ctitle = cluster.markerCount+" ...";
	  marker = new GMarker( location, { icon: clusterer.icon, title:ctitle } );
	  cluster.marker = marker;
	  GEvent.addListener( marker, 'click', Clusterer.MakeCaller( Clusterer.PopUp, cluster ) );
	}
      }
    }
    
    // Display the visible markers not already up and not in clusters.
    for ( i = 0; i < visibleMarkers.length; ++i )
    {
      marker = visibleMarkers[i];
      if ( marker != null && ! marker.onMap && ! marker.inCluster )
      {
	clusterer.map.addOverlay( marker );
	if ( marker.addedToMap != null )
	  marker.addedToMap();
	marker.onMap = true;
      }
    }
    
    // Display the visible clusters not already up.
    for ( i = 0; i < clusterer.clusters.length; ++i )
    {
      cluster = clusterer.clusters[i];
      if ( cluster != null && ! cluster.onMap && bounds.contains( cluster.marker.getPoint() ) )
      {
	clusterer.map.addOverlay( cluster.marker );
	cluster.onMap = true;
      }
    }
    
    // In case a cluster is currently popped-up, re-pop to get any new
    // markers into the infobox.
    Clusterer.RePop( clusterer );
    };


Clusterer.PopUp = function ( cluster )
{
  var clusterer = cluster.clusterer;
  var html = '<table width="">';
  var n = 0;
  for ( var i = 0; i < cluster.markers.length; ++i )
  {
    var marker = cluster.markers[i];
    if ( marker != null )
      {
	++n;
	html += '<tr><td>';
	if ( marker.getIcon().smallImage != null )
	  html += '<img src="' + marker.getIcon().smallImage + '">';
	else
	  html += '<img src="' + marker.getIcon().image + '" width="' + ( marker.getIcon().iconSize.width / 2 ) + '" height="' + ( marker.getIcon().iconSize.height / 2 ) + '">';
	html += '</td><td>' + marker.title + '</td></tr>';
	if ( n == clusterer.maxLinesPerInfoBox - 1 && cluster.markerCount > clusterer.maxLinesPerInfoBox  )
	  {
	    //	    html += '<tr><td colspan="2">...and ' + ( cluster.markerCount - n ) + ' more</td></tr>';
	    html += '<tr><td colspan="2">...</td></tr>';
	    break;
	  }
      }
  }
  html += '</table>';
  html += '<a href="#" onclick="mapmngt.expendCluster();return false"><img src="'+Clusterer.defaultIcon.image+'"/></a>';
  clusterer.map.closeInfoWindow();
  cluster.marker.openInfoWindowHtml( html );
  clusterer.poppedUpCluster = cluster;
};
Clusterer.RePop = function ( clusterer )
{
  if ( clusterer.poppedUpCluster != null )
  Clusterer.PopUp( clusterer.poppedUpCluster );
};


Clusterer.PopDown = function ( clusterer )
{
  clusterer.poppedUpCluster = null;
};


Clusterer.prototype.ClearCluster = function ( cluster )
{
  var i, marker;

  for ( i = 0; i < cluster.markers.length; ++i )
  if ( cluster.markers[i] != null )
	    {
	      cluster.markers[i].inCluster = false;
	      cluster.markers[i] = null;
	    }
  cluster.markers.length = 0;
  cluster.markerCount = 0;
  if ( cluster == this.poppedUpCluster )
  this.map.closeInfoWindow();
  if ( cluster.onMap )
  {
    this.map.removeOverlay( cluster.marker );
    cluster.onMap = false;
  }
};


// This returns a function closure that calls the given routine with the
// specified arg.
Clusterer.MakeCaller = function ( func, arg )
{
  return function () { func( arg ); };
    };


// Augment GMarker so it handles markers that have been created but
// not yet addOverlayed.

GMarker.prototype.setMap = function ( map )
{
  this.map = map;
};

GMarker.prototype.addedToMap = function ()
{
  this.map = null;
};

GMarker.prototype.origOpenInfoWindow = GMarker.prototype.openInfoWindow;
GMarker.prototype.openInfoWindow = function ( node, opts )
{
  if ( this.map != null )
  return this.map.openInfoWindow( this.getPoint(), node, opts );
  else
  return this.origOpenInfoWindow( node, opts );
    };

GMarker.prototype.origOpenInfoWindowHtml = GMarker.prototype.openInfoWindowHtml;
GMarker.prototype.openInfoWindowHtml = function ( html, opts )
{
  if ( this.map != null )
  return this.map.openInfoWindowHtml( this.getPoint(), html, opts );
  else
  return this.origOpenInfoWindowHtml( html, opts );
};

GMarker.prototype.origOpenInfoWindowTabs = GMarker.prototype.openInfoWindowTabs;
GMarker.prototype.openInfoWindowTabs = function ( tabNodes, opts )
{
    if ( this.map != null )
    return this.map.openInfoWindowTabs( this.getPoint(), tabNodes, opts );
    else
    return this.origOpenInfoWindowTabs( tabNodes, opts );
};

GMarker.prototype.origOpenInfoWindowTabsHtml = GMarker.prototype.openInfoWindowTabsHtml;
GMarker.prototype.openInfoWindowTabsHtml = function ( tabHtmls, opts )
{
  if ( this.map != null )
  return this.map.openInfoWindowTabsHtml( this.getPoint(), tabHtmls, opts );
  else
  return this.origOpenInfoWindowTabsHtml( tabHtmls, opts );
};

GMarker.prototype.origShowMapBlowup = GMarker.prototype.showMapBlowup;
GMarker.prototype.showMapBlowup = function ( opts )
{
  if ( this.map != null )
  return this.map.showMapBlowup( this.getPoint(), opts );
  else
	return this.origShowMapBlowup( opts );
};