using System.Drawing;
using System.Drawing.Drawing2D;
using JD.Application.View.WindowLess;
using JD.Collections;

namespace JD.Timeline.View
{
    /// <summary>
    /// Groups common style properties.
    /// </summary>
    /// <remarks>
    /// Holds a cache of GDI resources to avoid creating and deleted gdi handles on each paint.</remarks>
    public class StyleSheet
    {
        #region Cache

        private static readonly PenCache _penCache = new PenCache();
        private static readonly BrushCache _brushCache = new BrushCache();

        public static PenCache Pens { get { return _penCache; } }
        public static BrushCache Brushes { get { return _brushCache; } }

        public static StringFormat EllipsisStringFormat = new StringFormat { Trimming = StringTrimming.EllipsisCharacter };

        #endregion

        #region Constants

        public static Color LineColor = Color.FromArgb(60, 60, 60);

        public static Color TrackLightColor = Color.FromArgb(78, 78, 78);
        public static Color TrackDarkColor = Color.FromArgb(70, 70, 70);
        public static Color TrackSelectedLightColor = Color.DodgerBlue.Add(10);
        public static Color TrackSelectedDarkColor = Color.DodgerBlue.Add(-10);
        public static Color TrackForeColor = Color.FromArgb(180, 180, 180);

        public static Color BackgroundColor = Color.FromArgb(78, 78, 78);
        public static Color ClipEdgeColor = Color.FromArgb(128, 130, 129);
        public static Color ClipEdgeSelectedColor = Color.FromArgb(228, 230, 221);

        public static Brush CurvePointBrush = Brushes[Color.Yellow];
        public static Pen CurvePointPen = Pens[Color.Gray];

        #endregion

        #region Methods

        public static Brush GetTrackTreeBrush(Rectangle bounds, bool isAlternate, bool isSelected)
        {
            return GetTrackBrush(bounds, isAlternate, isSelected, 255);
        }

        public static Brush GetTrackBrush(Rectangle bounds, bool isAlternate)
        {
            return GetTrackBrush(bounds, isAlternate, false, 200);
        }

        public static Brush GetTrackBrush(Rectangle bounds, bool isAlternate, bool selected, int alpha)
        {
            var lightColor = (selected ? TrackSelectedLightColor : TrackLightColor).WithAlpha(alpha);
            var darkColor = (selected ? TrackSelectedDarkColor : TrackDarkColor).WithAlpha(alpha);
            if (isAlternate)
            {
                lightColor = lightColor.Add(15);
                darkColor = darkColor.Add(15);
            }

            return new LinearGradientBrush(bounds, lightColor, darkColor, LinearGradientMode.Vertical);
        }

        #endregion

        #region Nested

        public class PenCache : AbstractKeyedCache<Color, Pen>
        {
            protected override Pen CreateValue(Color key)
            {
                return new Pen(key);
            }
        }

        public class BrushCache : AbstractKeyedCache<Color, Brush>
        {
            protected override Brush CreateValue(Color key)
            {
                return new SolidBrush(key);
            }
        }

        #endregion
    }
}