var GoogleMapsEngine = function(mapElement){
	
	var $this = this;
	
	$this.NAME = 'GoogleMapsEngine';
	
	$this.events = {
		INIT_COMPLETE: 'initComplete',
		MAP_CLICK: 'mapClick'
	}
	
	$this.mapObject = null;
	$this.config = {
		startLat: 0,
		startLng: 0,
		startZoom: 11,
		startAtUserLocation: false,
		autoInit: true,
		setGrey: false,
		waitTime: 10000,
		scrollwheel: true,
		draggable: true,
		disableDoubleClickZoom: true,
		clickable: false,
		minZoom: 2,
		maxZoom: 20,
		mapTypeControl: false,
		panControl: true,
		zoomControl: true,
		scaleControl: false,
		streetViewControl: false
	}
	$this.geoTimeout = null;
	$this.markerIcon = {
		url: 'view/img/marker.png',
		size: new google.maps.Size(89, 51),
		origin: new google.maps.Point(0, 0),
		anchor: new google.maps.Point(17, 39)
	};
	$this.infoWindow = null;
	$this.markers = {};
		
		
	
	if( typeof mapElement == 'object' ){
		$this.mapObject = mapElement.get(0);
	}else if( typeof mapElement == 'string' ){
		$this.mapObject = $(mapElement).get(0);
	}else{
		throw $this.NAME + ': not a proper mapElement';
	}
	// TODO: add basic DOM Element type
	
	
	if( $this.mapObject == 'undefined' || $this.mapObject == null || $this.mapObject.length == 0 ){
		throw $this.NAME + ": can't find DOM element";
	}
	
	
	if( typeof arguments[1] == 'object' ){
		var prop;
		for( prop in arguments[1] ){
			if( $this.config.hasOwnProperty(prop) ){
				$this.config[prop] = arguments[1][prop];
			}
		}
	}
	
	
	//TODO: add custom marker look setup in config options
	
	
	
	
	
	
	
	$this.preInitMap = function(){
		if( $this.config.startAtUserLocation ){
			$this.getLocation();
		}else{
			$this.initMap();
		}
	}
	$this.initMap = function(){
		$this.mapOptions.center = new google.maps.LatLng( $this.config.startLat, $this.config.startLng );
		$this.maps = new google.maps.Map($this.mapObject, $this.mapOptions);
		$this.mapsLimitResolution();
		if( $this.config.setGrey ){
			$this.mapsSetInGrayscale();
		}
		
		if( $this.config.clickable ){
			google.maps.event.addListener($this.maps, 'click', function(evt){
				$this.geocoder.geocode({'latLng': evt.latLng}, $this.processRevGeocode);
			});
		}
		
		$( $this ).trigger( $this.events.INIT_COMPLETE );
	}
	
	$this.mapsLimitResolution = function() {
		$this.maps.setOptions({minZoom: $this.config.minZoom});
		$this.maps.setOptions({maxZoom: $this.config.maxZoom});
	}
	
	$this.mapsResizeAndCenter = function() {
		var center = $this.maps.getCenter();
		google.maps.event.trigger($this.maps, 'resize');
		$this.maps.setCenter(center);
	}
	
	$this.mapsSetInGrayscale = function() {
		var mapType = null;
		var mapStyles = [
			{
				featureType: 'all',
				elementType: 'all',
				stylers: [
					{gamma: 0.7},
					{lightness: 0},
					{saturation: -100}
				]
			}
		];
		mapType = new google.maps.StyledMapType(mapStyles, {name: 'Grayscale'});
		$this.maps.mapTypes.set('roadgray', mapType);
		$this.maps.setMapTypeId('roadgray');
	}
	
	
	$this.addMarker = function(name, lat, lng, draggable, title, infoContent, clickFunction) {
		var markersLength = $this.objectSize( $this.markers );
		
		var position = new google.maps.LatLng(lat, lng);
		var marker = new google.maps.Marker({
			position: position,
			map: $this.maps,
			draggable: draggable,
			icon: $this.markerIcon,
			title: title,
			zIndex: markersLength + 1
		});
		if( typeof infoContent != 'undefined' && infoContent != '' ){
			if( $this.infoWindow == null ){
				$this.infoWindow = new google.maps.InfoWindow({content: ''});
			}
			marker.infoContent = infoContent;
			google.maps.event.addListener(marker, 'click', function() {
				$this.infoWindow.content = this.infoContent;
				$this.infoWindow.open($this.maps, marker);
			});
		}else if( typeof clickFunction != 'undefined' ){
			google.maps.event.addListener(marker, 'click', clickFunction);
		}
		
		if( name == '' || name == 'auto' ){
			name = 'marker' + markersLength;
		}
		$this.markers[name] = marker;
		
		return name;
	}
	
	$this.removeMarker = function(name){
		if( typeof $this.markers[key] != 'undefined' ){
			$this.markers[key].setMap(null);
			delete $this.markers[key];
		}
	}
	
	$this.mapsClearOverlay = function() {
		var key;
		for (key in $this.markers) {
			$this.markers[key].setMap(null);
		}
		$this.markers = {};
	}
	
	$this.getLocation = function(){
		if (navigator.geolocation){
			navigator.geolocation.getCurrentPosition($this.showPosition, $this.unknownUserPosition );
		}else{
			$this.unknownUserPosition();
		}
		$this.geoTimeout = setTimeout($this.unknownUserPosition, $this.config.waitTime);
	}
	$this.showPosition = function(position){
		if( $this.geoTimeout ){
			clearTimeout( $this.geoTimeout );
		}
		$this.config.startLat = position.coords.latitude;
		$this.config.startLng = position.coords.longitude;
		$this.initMap();
	}
	$this.unknownUserPosition = function(errorCode){
		if( $this.geoTimeout ){
			clearTimeout( $this.geoTimeout );
		}
		$this.initMap();
	}
	
	$this.processRevGeocode = function(results, status) {
		if( status == google.maps.GeocoderStatus.OK ){
			var result;
			if( results.length > 1 ){
				result = results[1];
			}else{
				result = results[0];
			}
			if( result.geometry.viewport ){
				$this.maps.fitBounds(result.geometry.viewport);
			}else if( result.geometry.bounds ){
				$this.maps.fitBounds(result.geometry.bounds);  
			}else{ 
				$this.maps.setCenter(result.geometry.location);
			}
			$this.maps.setZoom(11);
			
			$( $this ).trigger( $this.events.MAP_CLICK, results );
			//TODO: Obrobic dane przed wyslanie zbey bylo latwiej
			
		}else{
			trace('Geocoder failed due to: ' + status);
		}
	}
	
	$this.center = function(lat, lng){
		var pos = new google.maps.LatLng(lat, lng);
		$this.maps.setCenter( pos );
	}
	
	
	
	
	
	
	
	
	
	
	
	$this.objectSize = function(obj){
		var size = 0, key;
		for( key in obj ){
			if( obj.hasOwnProperty(key) ){
				size++;
			}
		}
		return size;
	}
	
	
	
	
	
	
	
	
	
	
	
	$this.mapOptions = {
		zoom: $this.config.startZoom,
		center: new google.maps.LatLng( $this.config.startLat, $this.config.startLng ),
		//mapTypeId : google.maps.MapTypeId.ROADMAP,
		mapTypeIds: [google.maps.MapTypeId.ROADMAP, 'roadgray'],
		mapTypeControl: $this.config.mapTypeControl,
		mapTypeControlOptions: {position: google.maps.ControlPosition.RIGHT_BOTTOM},
		panControl: $this.config.panControl,
		panControlOptions: {position: google.maps.ControlPosition.LEFT_TOP},
		zoomControl: $this.config.zoomControl,
		zoomControlOptions: {position: google.maps.ControlPosition.LEFT_TOP},
		scaleControl: $this.config.scaleControl,
		scaleControlOptions: {position: google.maps.ControlPosition.LEFT_BOTTOM},
		streetViewControl: $this.config.streetViewControl,
		streetViewControlOptions: {position: google.maps.ControlPosition.RIGHT_CENTER},
		scrollwheel: $this.config.scrollwheel,
		draggable: $this.config.draggable,
		disableDoubleClickZoom: $this.config.disableDoubleClickZoom
	};
	$this.geocoder = new google.maps.Geocoder();
	
	if( $this.config.autoInit ){
		if( $this.config.startAtUserLocation ){
			$this.getLocation();
		}else{
			$this.initMap();
		}
	}
	
	return {
		events: $this.events,
		init: $this.preInitMap,
		addMarker: $this.addMarker,
		center: $this.center,
		map: $this,
		resize: $this.mapsResizeAndCenter
	}
	
};