(function($, undefined) {

// expects self.aGeopositions to be set to
// [[iLat0, iLong0], [iLat1, iLong1], [iLat2, iLong2],..]

self.GMapViewManager = {
    oMap: null,
    aMarkers: [],
    sContextItemType: "",
    sSlug: "",
    sGMapImagePath: window.settings.media_url + "img/gmap/",
    oSelected: null,
    init: function() {
        var oSelf = self.GMapViewManager;
        oSelf.initGMaps(document.getElementById("gmap_view"));

        // parse url
        var aUrlBits = window.website.path.substr(1).split("/");
        // person|institution|event|document|group
        oSelf.sContextItemType = aUrlBits[0];
        oSelf.sSlug = aUrlBits[aUrlBits.length - 3];
        $("#dyn_map").removeClass("hidden");
        oSelf.markAllGeopositions();
        
    },
    initGMaps: function(oElem) {
        var oSelf = self.GMapViewManager;
        var oOptions = {
            zoom: 15,
            center: new google.maps.LatLng(52.523781, 13.411895),
            mapTypeId: google.maps.MapTypeId.ROADMAP,
            mapTypeControlOptions: {
                style: google.maps.MapTypeControlStyle.DROPDOWN_MENU
            },
            navigationControlOptions: {
                style: google.maps.NavigationControlStyle.SMALL
            }
        };
        oSelf.oMap = new google.maps.Map(oElem, oOptions);
    },
    clearMarkers: function() {
        var oSelf = self.GMapViewManager;
        while(oSelf.aMarkers.length > 0) {
            var oMarker = oSelf.aMarkers.pop();
            oMarker.setMap(null);
            oMarker = null;
        }
    },
    drawMarker: function(oPoint) {
        var oSelf = self.GMapViewManager;
        var oImage = new google.maps.MarkerImage(
            window.settings.media_url + "img/gmap/markers_1-10.png",
            // This marker is 20 pixels wide by 32 pixels tall.
            new google.maps.Size(20, 34),
            // The origin for this image is 0,0.
            new google.maps.Point(0, 340),
            // The anchor for this image is the base of the flagpole at 0,32.
            new google.maps.Point(10, 34)
        );
        var oShadow = new google.maps.MarkerImage(
            window.settings.media_url + "img/gmap/marker_shadow.png",
            // The shadow image is larger in the horizontal dimension
            // while the position and offset are the same as for the main image.
            new google.maps.Size(37, 34),
            new google.maps.Point(0, 0),
            new google.maps.Point(8, 25)
        );
        
        var oMarker = new google.maps.Marker({
            position: oPoint,
            map: oSelf.oMap,
            shadow: oShadow,
            icon: oImage
        });
        oSelf.aMarkers.push(oMarker);
    },
    markGeoposition: function(sIndex) {
        var oSelf = self.GMapViewManager;
        var aPos = self.aGeopositions || [];
        if (typeof(sIndex) != "string" && typeof(sIndex) != "number") {
            sIndex = $(this).attr("href").split("#")[1].substr(8);
        }
        var aGeo = aPos[parseInt(sIndex, 10)];
        iLat = aGeo[0];
        iLong = aGeo[1];
        if (oSelf.oSelected) {
            oSelf.oSelected.removeClass("active");
        }
        oSelf.clearMarkers();
        var oPoint = new google.maps.LatLng(iLat, iLong);
        oSelf.oMap.setCenter(oPoint, 15);
        oSelf.drawMarker(oPoint);
    },
    markAllGeopositions: function() {
        var oSelf = self.GMapViewManager;
        if (oSelf.oSelected) {
            oSelf.oSelected.removeClass("active");
        }
        oSelf.clearMarkers();
        
        var aPos = self.aGeopositions || [];
        /* the center of the map should be (x, y), where 
        x = avg(min(xx), max(xx))
        y = avg(min(yy), max(yy))
        xx is the array of latitudes
        yy is the array of longitudes
        */
        var lat_min = long_min = 500;
        var lat_max = long_max = -500;
        var aPoints = []
        for (iI=0, iLen=aPos.length; iI<iLen; iI++) {
            iLat = aPos[iI][0];
            iLong = aPos[iI][1];
            if (lat_max < iLat)
                lat_max = iLat;
            if (iLat < lat_min)
                lat_min = iLat;
            if (long_max < iLong)
                long_max = iLong;
            if (iLong < long_min)
                long_min = iLong;
            
            var oPoint = new google.maps.LatLng(iLat, iLong);
            oSelf.drawMarker(oPoint);
            aPoints.push(oPoint);
        }
        oSelf.fitMap(aPoints);
    },
    fitMap: function (aPoints) {
        var oSelf = self.GMapViewManager;
        var oMap = oSelf.oMap;
        var oBounds = new google.maps.LatLngBounds();
        for (var i=0, iLen=aPoints.length; i<iLen; i++) {
            oBounds.extend(aPoints[i]);
        }
        var oNEPoint = oBounds.getNorthEast();
        oBounds.extend(new google.maps.LatLng(
            oNEPoint.lat() - .005,
            oNEPoint.lng() - .005
        ));
        
        var oSWPoint = oBounds.getNorthEast();
        oBounds.extend(new google.maps.LatLng(
            oSWPoint.lat() + .005,
            oSWPoint.lng() + .005
        ));
        oMap.fitBounds(oBounds);
    },
    destruct: function() {
        self.GMapViewManager = null;
    }
};

$(document).ready(function(){
    self.GMapViewManager.init();
});

$(window).unload(function() {
    self.GMapViewManager.destruct();
});

}(jQuery));