using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Media.TextFormatting;
using Microsoft.Research.DynamicDataDisplay.Common;

namespace Microsoft.Research.DynamicDataDisplay
{
    public static class DataRectExtensions
    {
        internal static bool IsNaN( this DataRect rect )
        {
            return !rect.IsEmpty &&
                (
                rect.XMin.IsNaN() ||
                rect.YMin.IsNaN() ||
                rect.XMax.IsNaN() ||
                rect.YMax.IsNaN()
                );
        }

        /// <summary>
        /// Gets the center of specified rectangle.
        /// </summary>
        /// <param name="rect">The rect.</param>
        /// <returns></returns>
        public static Point GetCenter( this DataRect rect )
        {
            return new Point( rect.XMin + rect.Width * 0.5, rect.YMin + rect.Height * 0.5 );
        }

        public static DataRect Zoom( this DataRect rect, Point to, double ratio )
        {
            return CoordinateUtilities.RectZoom( rect, to, ratio );
        }

        /// <summary>
        /// Zooms out from center.
        /// </summary>
        /// <param name="rect">The rect.</param>
        /// <param name="ratio">The ratio.</param>
        /// <returns></returns>
        public static DataRect ZoomOutFromCenter( this DataRect rect, double ratio )
        {
            return CoordinateUtilities.RectZoom( rect, rect.GetCenter(), ratio );
        }

        /// <summary>
        /// Zooms in to center.
        /// </summary>
        /// <param name="rect">The rect.</param>
        /// <param name="ratio">The ratio.</param>
        /// <returns></returns>
        public static DataRect ZoomInToCenter( this DataRect rect, double ratio )
        {
            return CoordinateUtilities.RectZoom( rect, rect.GetCenter(), 1 / ratio );
        }

        public static DataRect ZoomX( this DataRect rect, Point to, double ratio )
        {
            return CoordinateUtilities.RectZoomX( rect, to, ratio );
        }

        public static DataRect ZoomY( this DataRect rect, Point to, double ratio )
        {
            return CoordinateUtilities.RectZoomY( rect, to, ratio );
        }

        /// <summary>
        /// Gets the square of specified DataRect. 
        /// </summary>
        /// <param name="rect">The rect.</param>
        /// <returns></returns>
        public static double GetSquare( this DataRect rect )
        {
            if ( rect.IsEmpty )
                return 0;

            return rect.Width * rect.Height;
        }

        /// <summary>
        /// Determines whether one DataRect is close to another DataRect.
        /// </summary>
        /// <param name="rect1">The rect1.</param>
        /// <param name="rect2">The rect2.</param>
        /// <param name="difference">The difference.</param>
        /// <returns>
        /// 	<c>true</c> if [is close to] [the specified rect1]; otherwise, <c>false</c>.
        /// </returns>
        public static bool IsCloseTo( this DataRect rect1, DataRect rect2, double difference )
        {
            DataRect intersection = DataRect.Intersect( rect1, rect2 );
            double square1 = rect1.GetSquare();
            double square2 = rect2.GetSquare();
            double intersectionSquare = intersection.GetSquare();

            bool areClose = MathHelper.AreClose( square1, intersectionSquare, difference ) &&
                MathHelper.AreClose( square2, intersectionSquare, difference );
            return areClose;
        }

        public static DataRect WithX( this DataRect rect, double xmin, double xmax )
        {
            return DataRect.Create( xmin, rect.YMin, xmax, rect.YMax );
        }

        public static DataRect WithY( this DataRect rect, double ymin, double ymax )
        {
            return DataRect.Create( rect.XMin, ymin, rect.XMax, ymax );
        }
    }
}