using System;
using System.Collections.ObjectModel;
using System.Globalization;
using System.Web.UI;
using ThinkGeo.MapSuite.Core;
using ThinkGeo.MapSuite.WebEdition;

namespace CSSamples.Samples.Querying_Vector_Layers
{
    public partial class FindFeaturesWithinDistance : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                Map1.MapBackground.BackgroundBrush = new GeoSolidBrush(GeoColor.FromHtml("#B3C6D4"));
                Map1.CurrentExtent = new RectangleShape(-125, 72, 50, -46);
                Map1.MapUnit = GeographyUnit.DecimalDegree;

                WorldMapKitWmsWebOverlay worldMapKitOverlay = new WorldMapKitWmsWebOverlay();
                Map1.CustomOverlays.Add(worldMapKitOverlay);

                ShapeFileFeatureLayer worldLayer = new ShapeFileFeatureLayer(MapPath("~/SampleData/world/cntry02.shp"));
                worldLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.SimpleColors.Transparent, GeoColor.FromArgb(100, GeoColor.SimpleColors.Green));
                worldLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

                LayerOverlay staticOverlay = new LayerOverlay("StaticOverlay");
                staticOverlay.IsBaseOverlay = false;
                staticOverlay.Layers.Add("WorldLayer", worldLayer);
                Map1.CustomOverlays.Add(staticOverlay);

                InMemoryFeatureLayer highlightLayer = new InMemoryFeatureLayer();
                highlightLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = PointStyles.Capital2;
                highlightLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.CreateSimpleAreaStyle(GeoColor.SimpleColors.Transparent, GeoColor.SimpleColors.Green);
                highlightLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

                InMemoryFeatureLayer selectedFeatureLayer = new InMemoryFeatureLayer();
                selectedFeatureLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.Evergreen1;
                selectedFeatureLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

                LayerOverlay dynamicOverlay = new LayerOverlay("DynamicOverlay");
                dynamicOverlay.IsBaseOverlay = false;
                dynamicOverlay.TileType = TileType.SingleTile;
                dynamicOverlay.Layers.Add("HighlightLayer", highlightLayer);
                dynamicOverlay.Layers.Add("selectedFeatureLayer", selectedFeatureLayer);
                Map1.CustomOverlays.Add(dynamicOverlay);
            }
        }

        protected void DistanceDropDownList_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (ViewState["CenterPoint"] != null)
            {
                FindWithinDistanceFeatures();
            }
        }

        protected void Map1_Click(object sender, MapClickedEventArgs e)
        {
            ViewState["CenterPoint"] = e.Position;
            FindWithinDistanceFeatures();
        }

        private void FindWithinDistanceFeatures()
        {
            PointShape pointShape = (PointShape)ViewState["CenterPoint"];
            double distance = Convert.ToDouble(DistanceDropDownList.SelectedItem.ToString(), CultureInfo.InvariantCulture);
            double xInDegree = DecimalDegreesHelper.GetLongitudeDifferenceFromDistance(distance, DistanceUnit.Kilometer, pointShape.Y);
            double yInDegree = DecimalDegreesHelper.GetLatitudeDifferenceFromDistance(distance, DistanceUnit.Kilometer);
            RectangleShape rect = new RectangleShape(pointShape.X - xInDegree, pointShape.Y + yInDegree, pointShape.X + xInDegree, pointShape.Y - yInDegree);

            LayerOverlay staticOverlay = (LayerOverlay)Map1.CustomOverlays["StaticOverlay"];
            LayerOverlay dynamicOverlay = (LayerOverlay)Map1.CustomOverlays["DynamicOverlay"];

            FeatureLayer worldLayer = (FeatureLayer)staticOverlay.Layers["WorldLayer"];
            InMemoryFeatureLayer highlightLayer = (InMemoryFeatureLayer)dynamicOverlay.Layers["HighlightLayer"];
            InMemoryFeatureLayer selectedFeatureLayer = (InMemoryFeatureLayer)dynamicOverlay.Layers["selectedFeatureLayer"];

            // Find the countries within special distance.
            worldLayer.Open();
            Collection<Feature> selectedFeatures = worldLayer.QueryTools.GetFeaturesWithin(rect, ReturningColumnsType.NoColumns);
            worldLayer.Close();

            highlightLayer.InternalFeatures.Clear();
            selectedFeatureLayer.InternalFeatures.Clear();
            highlightLayer.InternalFeatures.Add("Point", new Feature(pointShape));
            highlightLayer.InternalFeatures.Add("Rect", new Feature(rect));
            foreach (Feature feature in selectedFeatures)
            {
                selectedFeatureLayer.InternalFeatures.Add(feature.Id, feature);
            }

            dynamicOverlay.Redraw();
        }
    }
}