using System.Collections.ObjectModel;
using ThinkGeo.MapSuite.Core;
using ThinkGeo.MapSuite.WpfDesktopEdition;

namespace Core.Presentation
{
    class RulerTrackInteractiveOverlay : TrackInteractiveOverlay
    {
        private const string currentFeatureKey = "CurrentFeature";
        private LineShape rulerLineShape;
        private Proj4Projection proj4;
        private int mouseDown;

        public RulerTrackInteractiveOverlay()
            : base()
        {
            proj4 = new Proj4Projection();
            proj4.InternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(4326);
            proj4.ExternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(4326);
            proj4.Open();

            TrackShapeLayer.Open();
            TrackShapeLayer.Columns.Add(new FeatureSourceColumn("length"));
            //Sets the appearance of the ruler
            TrackShapeLayer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle = LineStyles.CreateSimpleLineStyle(GeoColor.FromArgb(150, GeoColor.StandardColors.DarkRed), 4, false);
            TrackShapeLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle = new TextStyle("length", new GeoFont("Arial", 10, DrawingFontStyles.Bold), new GeoSolidBrush(GeoColor.SimpleColors.Black));
            TrackShapeLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle.TextLineSegmentRatio = 100;
            TrackShapeLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle.YOffsetInPixel = 10;
            TrackShapeLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
        }

        protected override InteractiveResult MouseDownCore(InteractionArguments interactionArguments)
        {
            //Sets the first and last point of the line where the user clicks.
            InteractiveResult interactiveResult = new InteractiveResult();
            if (TrackMode == TrackMode.Line)
            {
                interactiveResult.DrawThisOverlay = InteractiveOverlayDrawType.Draw;
                interactiveResult.ProcessOtherOverlaysMode = ProcessOtherOverlaysMode.DoNotProcessOtherOverlays;

                rulerLineShape = new LineShape(new Collection<Vertex>() { new Vertex(interactionArguments.WorldX, interactionArguments.WorldY), new Vertex(interactionArguments.WorldX, interactionArguments.WorldY) });

                Feature newFeature = new Feature(rulerLineShape);
                if (TrackShapeLayer.InternalFeatures.Contains(currentFeatureKey)) TrackShapeLayer.InternalFeatures[currentFeatureKey] = newFeature;
                else TrackShapeLayer.InternalFeatures.Add(currentFeatureKey, newFeature);

                mouseDown++;
            }
            return interactiveResult;
        }

        protected override InteractiveResult MouseMoveCore(InteractionArguments interactionArguments)
        {
            //Updates the line with the last point to where the mouse pointer is being dragged.
            InteractiveResult interactiveResult = new InteractiveResult();

            if(TrackMode == TrackMode.Line && mouseDown > 0)
            {
                rulerLineShape.Vertices[rulerLineShape.Vertices.Count - 1] = new Vertex(interactionArguments.WorldX, interactionArguments.WorldY);
                interactiveResult.DrawThisOverlay = InteractiveOverlayDrawType.Draw;
                interactiveResult.ProcessOtherOverlaysMode = ProcessOtherOverlaysMode.DoNotProcessOtherOverlays;
            }

            return interactiveResult;
        }

        protected override InteractiveResult MouseUpCore(InteractionArguments interactionArguments)
        {
            //Removes the line of the ruler at finishing dragging (at mouse up event).
            InteractiveResult interactiveResult = new InteractiveResult();

            if (TrackMode == TrackMode.Line)
            {
                interactiveResult.DrawThisOverlay = InteractiveOverlayDrawType.Draw;
                interactiveResult.ProcessOtherOverlaysMode = ProcessOtherOverlaysMode.DoNotProcessOtherOverlays;

                if (mouseDown == 1)
                {
                    mouseDown = 0;
                    TrackShapeLayer.InternalFeatures.Remove(currentFeatureKey);
                    rulerLineShape = null;
                }
            }
            return interactiveResult;
        }

        protected override void DrawCore(RectangleShape targetExtent, RefreshType refreshType)
        {
            if (rulerLineShape != null)
            {
                Feature feature = new Feature(rulerLineShape);
                rulerLineShape = (LineShape)proj4.ConvertToExternalProjection(rulerLineShape);

                double length = rulerLineShape.GetLength(GeographyUnit.DecimalDegree, DistanceUnit.Feet);
                feature.ColumnValues.Add("length", ((int)length).ToString() + " feet");
                if (TrackShapeLayer.InternalFeatures.Contains(currentFeatureKey)) TrackShapeLayer.InternalFeatures[currentFeatureKey] = feature;
                else TrackShapeLayer.InternalFeatures.Add(currentFeatureKey, feature);
            }

            base.DrawCore(targetExtent, refreshType);

            
        }
    }
}