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/****************************************************************
*************          Global Variables            **************
****************************************************************/

var polygonBoundaries = new Array(); // Array of polygons to display on a map.

var defaultPolygonOptions = {
    strokeColor: '#999999',
    strokeOpacity: 1,
    strokeWeight: 1,
    fillColor: '#46461F',
    fillOpacity: 0.10
};

var defaultPolygonHoverOptions = {
    strokeColor: '#2d9908',
    strokeOpacity: 1,
    strokeWeight: 1,
    fillColor: '#3eb216',
    fillOpacity: 0.60
};






/****************************************************************
*************            Polygon Storage           **************
****************************************************************/

function createPolygon(type, polygon, properties) {
    item = new Object();
    item.type = type;
    item.polygon = polygon;
    item.properties = properties;

    return item;
}

// Removes all the polygons that have been remembered. If a type is provided, then it attempts to remove only those instances.
function clearPolygons(type) {

    $.each(polygonBoundaries, function () {
        this.polygon.setMap(null);
    });

    // Empty the array.
    polygonBoundaries.length = 0;
}

function addPolygons(polygons) {
    if (polygons == null) {
        return;
    }

    $.each(polygons, function () {
        polygonBoundaries.push(this);
    });
}


function setPolygonColours(inactiveElement, activeElement) {
    if (inactiveElement.val() != null && inactiveElement.val() != '') {
        defaultPolygonOptions.fillColor = inactiveElement.val();
    }

    if (activeElement.val() != null && activeElement.val() != '') {
        defaultPolygonHoverOptions.fillColor = activeElement.val();
    }
}






/****************************************************************
*************            Polygon Events            **************
****************************************************************/


function togglePolygonLayers(googleMap, type, isVisible) {
    $.each(polygonBoundaries, function () {
        if (type == null || this.type == type) {
            if (isVisible) {
                this.polygon.setMap(googleMap); // Display this polygon on a googlemap.
            }
            else {
                this.polygon.setMap(null); // This this polygon from a google map.
            }
        }
    });
}

function togglePolygonLayer(googleMap, checkboxElement, inactiveElement, activeElement) {
    // Set the polygon colours.
    setPolygonColours(inactiveElement, activeElement);

    resetPolygonDisplayOptions();

    // Toggle the layer.
    togglePolygonLayers(googleMap, $(checkboxElement).val(), $(checkboxElement).is(':checked'));
}





/****************************************************************
*************     Polygon Json Data Conversion     **************
****************************************************************/

function getFeaturesFromGeoJsonFeatureCollection(geoJson, type) {

    var features = [];

    $.each(geoJson.features, function () {
        var polygon = getPolygonFromFeature(this, this.properties.Score);
        setListenerEventsForAPolygon(polygon, this.properties.Url, this.properties.Name, this.properties.Score);
        features.push(createPolygon(type, polygon, this.properties));
    });

    return features;
}

function getPolygonFromFeature(geoJsonFeature, score) {

    var paths = [];

    for (var i = 0; i < geoJsonFeature.geometry.coordinates.length; i++) {
        var path = [];
        for (var j = 0; j < geoJsonFeature.geometry.coordinates[i].length; j++) {
            var point = new google.maps.LatLng(geoJsonFeature.geometry.coordinates[i][j][1], geoJsonFeature.geometry.coordinates[i][j][0]);
            path.push(point);
        }
        paths.push(path);
    }

    var options = $.extend({ paths: paths }, defaultPolygonOptions);
    options.fillColor = score > 0 ? getFillColour(score) : defaultPolygonOptions.fillColor;
    options.fillOpacity = score > 0 ? 0.8 : 0.1;
    return new google.maps.Polygon(options);
}

function setListenerEventsForAPolygon(polygon, uri, name, score) {
    // Add google map events to this polygon.
    google.maps.event.addListener(polygon, 'click', function () {
        alert('Visit: ' + uri);
    });

    google.maps.event.addListener(polygon, 'mousemove', function () {
        showToolTip(mousePos, name + '  -- Score: ' + score);
        this.setOptions(defaultPolygonHoverOptions);
    });

    var temp = $.extend({}, defaultPolygonOptions);
    temp.fillColor = score > 0 ? getFillColour(score) : defaultPolygonOptions.fillColor;
    temp.fillOpacity = score > 0 ? 0.8 : 0.1;

    google.maps.event.addListener(polygon, 'mouseout', function () {
        hideToolTip();
        this.setOptions(temp);
    });
}

function resetPolygonDisplayOptions() {
    // Remove all existing listeners.
    google.maps.event.clearListeners(googleMap, 'click');
    google.maps.event.clearListeners(googleMap, 'mousemove');
    google.maps.event.clearListeners(googleMap, 'mouseout');

    $.each(polygonBoundaries, function () {
        setListenerEventsForAPolygon(this.polygon, this.properties.Url, this.properties.Name, this.properties.Score);
        this.polygon.fillColor = this.properties.Score > 0 ? getFillColour(this.properties.Score) : defaultPolygonOptions.fillColor;
        this.polygon.fillOpacity = this.properties.Score > 0 ? 0.8 : 0.1;
    });
}

function getFillColour(score) {
    if (score > 90) return '#FF0000'; // bright red
    if (score > 80) return '#FF8400';
    if (score > 70) return '#FFCC00';
    if (score > 60) return '#FFFB00';
    if (score > 50) return '#8885D6';
    if (score > 40) return '#3C399E';
    if (score > 30) return '#48FF00';
    if (score > 20) return '#00FF88';
    if (score > 10) return '#0059FF';
    return '#000000';
}




/****************************************************************
*************        Google Maps Utilities         **************
****************************************************************/

var mousePos = {}; // Current mouse position.

$(function () {
    $(document).mousemove(function (e) {
        mousePos.x = e.pageX;
        mousePos.y = e.pageY;
    });
});

function getNorthWest(northEastLatLng, southWestLatLng) {
    return new google.maps.LatLng(southWestLatLng.lat(), northEastLatLng.lng());
}

function getSouthEast(northEastLatLng, southWestLatLng) {
    return new google.maps.LatLng(northEastLatLng.lat(), southWestLatLng.lng());
}

function getMapRadius(googleMap) {
    var bounds = googleMap.getBounds();
    var northEast = bounds.getNorthEast();
    var southWest = bounds.getSouthWest();
    var km = (northEast.distanceFrom(southWest) / 1000);
    return Math.ceil(km / 2);
}

function showToolTip(pos, text) {
    var container = $('#maptooltipcontainer');
    var offsetX = Math.floor(container.width() / 2);
    var offsetY = container.height() + 20;
    container.text(text).css('left', (pos.x - offsetX) + 'px').css('top', (pos.y - offsetY) + 'px').show();
}

function hideToolTip() {
    $('#maptooltipcontainer').hide();
}








/****************************************************************
*************            Polygon Ajax              **************
****************************************************************/

function getPolygonJson(googleMap, dataTypeToRetrieve, callback) {
    if (googleMap == null || dataTypeToRetrieve == null) {
        return false;
    }

    // Grab the bounding box, for the current map's viewport.
    var bounds = googleMap.getBounds();
    if (bounds == null) {
        return false;
    }

    // Determine the bounding box and the url to hit.
    ne = bounds.getNorthEast();
    sw = bounds.getSouthWest();
    nw = getNorthWest(ne, sw);
    se = getSouthEast(ne, sw);

    // Maybe this is for school markers?
    if (dataTypeToRetrieve == "schools") {
        url = '/GeoSpatial/ShowSchoolsNearBy?format=json&longitude=' + googleMap.getCenter().lng() + 
            '&latitude=' + googleMap.getCenter().lat() + 
            '&radius=' + getMapRadius(googleMap)
    }
    else {
        url = '/GeoSpatial/ShowLocations?format=json&upperLeftLongitude=' + nw.lng() + 
            '&upperLeftLatitude=' + nw.lat() + 
            '&lowerRightLongitude=' + se.lng() + 
            '&lowerRightLatitude=' + se.lat() + 
            '&locationType=' + dataTypeToRetrieve;
    }

    // Now fire it off, asynchronously!
    var startTime = new Date().getTime();
    var request = $.getJSON(url, function (jsonResult) {
        var result =
        {
            geoJson: jsonResult,
            type: dataTypeToRetrieve,
            contentLength: request.getResponseHeader("Content-Length"),
            startTime: startTime
        };
        callback(result);
    });

    return true;
}