using System.Threading;
using System.Windows;
using System.Windows.Media;
using System;

namespace Microsoft.Research.DynamicDataDisplay.PointMarkers
{
	/// <summary>Renders specified text near the point</summary>
	public class CenteredTextMarker : PointMarker
	{
    public static double DEFAULT_VERTICAL_SHIFT=-20;
    public static double DEFAULT_HORIZONTAL_SHIFT=0;
		public string Text
		{
			get { return (string)GetValue(TextProperty); }
			set { SetValue(TextProperty, value); }
		}
    public static readonly DependencyProperty TextProperty =
      DependencyProperty.Register(
        "Text",
        typeof(string),
        typeof(CenteredTextMarker),
        new FrameworkPropertyMetadata(""));


		public static readonly DependencyProperty VerticalShiftProperty =
			DependencyProperty.Register(
			  "VerticalShift",
			  typeof(string),
			  typeof(CenteredTextMarker),
			  new FrameworkPropertyMetadata(""));

		public static readonly DependencyProperty HorizontalShiftProperty =
			DependencyProperty.Register(
			  "HorizontalShift",
			  typeof(string),
			  typeof(CenteredTextMarker),
			  new FrameworkPropertyMetadata(""));

    public string VerticalShift
    {
      get { return (string)GetValue(VerticalShiftProperty); }
      set { SetValue(VerticalShiftProperty, value); }
    }

    public string HorizontalShift
    {
      get { return (string)GetValue(HorizontalShiftProperty); }
      set { SetValue(HorizontalShiftProperty, value); }
    }

		public override void Render(DrawingContext dc, Point screenPoint)
		{
			FormattedText textToDraw = new FormattedText(Text, Thread.CurrentThread.CurrentCulture,
			FlowDirection.LeftToRight, new Typeface("Arial"), 12, Brushes.Black,1.0);

			double width = textToDraw.Width;
			double height = textToDraw.Height;

			double verticalShift = DEFAULT_VERTICAL_SHIFT; // px
      if (null != VerticalShift&&!"".Equals(VerticalShift))verticalShift = double.Parse(VerticalShift); 

      double horizontalShift=DEFAULT_HORIZONTAL_SHIFT;
      if (null != HorizontalShift&&!"".Equals(HorizontalShift)) horizontalShift = double.Parse(HorizontalShift);

//			Rect bounds = RectExtensions.FromCenterSize(new Point(screenPoint.X+horizontalShift, screenPoint.Y + verticalShift - height / 2),new Size(width, height));
      double xPoint=0.00;
      double yPoint=0.00;
      if(0.00==horizontalShift)xPoint=screenPoint.X+horizontalShift;
      else xPoint=screenPoint.X+horizontalShift - width/2;
      yPoint=screenPoint.Y + verticalShift - height / 2;
			Rect bounds = RectExtensions.FromCenterSize(new Point(xPoint, yPoint),new Size(width, height));

// forcing the X bound is incorrect as this will always force the text into the visible viewport even when it should be out of view
//   if(bounds.X<0)bounds.X=Math.Abs(horizontalShift);
			Point loc = bounds.Location;
			bounds = CoordinateUtilities.RectZoom(bounds, 1.05, 1.15);

			dc.DrawLine(new Pen(Brushes.Black, 1), Point.Add(screenPoint, new Vector(0, verticalShift)), screenPoint);
			dc.DrawRectangle(Brushes.White, new Pen(Brushes.Black, 1), bounds);
			dc.DrawText(textToDraw, loc);
		}
	}
}