using System;
using pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Xml;

namespace Tango.Scripting.Editors.Utils
{
	static class ExtensionMethods
	{
		#region Epsilon / IsClose / CoerceValue
		/// <summary>
		/// Epsilon used for <c>IsClose()</c> implementations.
		/// We can use up quite a few digits in front of the decimal point (due to visual positions being relative to document origin),
		/// and there's no need to be too accurate (we're dealing with pixels here),
		/// so we will use the value 0.01.
		/// Previosly we used 1e-8 but that was causing issues:
		/// http://community.sharpdevelop.net/forums/t/16048.aspx
		/// </summary>
		public const double Epsilon = 0.01;
		
		/// <summary>
		/// Returns true if the doubles are close (difference smaller than 0.01).
		/// </summary>
		public static bool IsClose(this double d1, double d2)
		{
			if (d1 == d2) // required for infinities
				return true;
			return Math.Abs(d1 - d2) < Epsilon;
		}
		
		/// <summary>
		/// Returns true if the doubles are close (difference smaller than 0.01).
		/// </summary>
		public static bool IsClose(this Size d1, Size d2)
		{
			return IsClose(d1.Width, d2.Width) && IsClose(d1.Height, d2.Height);
		}
		
		/// <summary>
		/// Returns true if the doubles are close (difference smaller than 0.01).
		/// </summary>
		public static bool IsClose(this Vector d1, Vector d2)
		{
			return IsClose(d1.X, d2.X) && IsClose(d1.Y, d2.Y);
		}
		
		/// <summary>
		/// Forces the value to stay between mininum and maximum.
		/// </summary>
		/// <returns>minimum, if value is less than minimum.
		/// Maximum, if value is greater than maximum.
		/// Otherwise, value.</returns>
		public static double CoerceValue(this double value, double minimum, double maximum)
		{
			return Math.Max(Math.Min(value, maximum), minimum);
		}
		
		/// <summary>
		/// Forces the value to stay between mininum and maximum.
		/// </summary>
		/// <returns>minimum, if value is less than minimum.
		/// Maximum, if value is greater than maximum.
		/// Otherwise, value.</returns>
		public static int CoerceValue(this int value, int minimum, int maximum)
		{
			return Math.Max(Math.Min(value, maximum), minimum);
		}
		#endregion
		
		#region CreateTypeface
		/// <summary>
		/// Creates typeface from the framework element.
		/// </summary>
		public static Typeface CreateTypeface(this FrameworkElement fe)
		{
			return new Typeface((FontFamily)fe.GetValue(TextBlock.FontFamilyProperty),
			                    (FontStyle)fe.GetValue(TextBlock.FontStyleProperty),
			                    (FontWeight)fe.GetValue(TextBlock.FontWeightProperty),
			                    (FontStretch)fe.GetValue(TextBlock.FontStretchProperty));
		}
		#endregion
		
		#region AddRange / Sequence
		public static void AddRange<T>(this ICollection<T> collection, IEnumerable<T> elements)
		{
			foreach (T e in elements)
				collection.Add(e);
		}
		
		/// <summary>
		/// Creates an IEnumerable with a single value.
		/// </summary>
		public static IEnumerable<T> Sequence<T>(T value)
		{
			yield return value;
		}
		#endregion
		
		#region XML reading
		/// <summary>
		/// Gets the value of the attribute, or null if the attribute does not exist.
		/// </summary>
		public static string GetAttributeOrNull(this XmlElement element, string attributeName)
		{
			XmlAttribute attr = element.GetAttributeNode(attributeName);
			return attr != null ? attr.Value : null;
		}
		
		/// <summary>
		/// Gets the value of the attribute as boolean, or null if the attribute does not exist.
		/// </summary>
		public static bool? GetBoolAttribute(this XmlElement element, string attributeName)
		{
			XmlAttribute attr = element.GetAttributeNode(attributeName);
			return attr != null ? (bool?)XmlConvert.ToBoolean(attr.Value) : null;
		}
		
		/// <summary>
		/// Gets the value of the attribute as boolean, or null if the attribute does not exist.
		/// </summary>
		public static bool? GetBoolAttribute(this XmlReader reader, string attributeName)
		{
			string attributeValue = reader.GetAttribute(attributeName);
			if (attributeValue == null)
				return null;
			else
				return XmlConvert.ToBoolean(attributeValue);
		}
		#endregion
		
		#region DPI independence
		public static Rect TransformToDevice(this Rect rect, Visual visual)
		{
			Matrix matrix = PresentationSource.FromVisual(visual).CompositionTarget.TransformToDevice;
			return Rect.Transform(rect, matrix);
		}
		
		public static Rect TransformFromDevice(this Rect rect, Visual visual)
		{
			Matrix matrix = PresentationSource.FromVisual(visual).CompositionTarget.TransformFromDevice;
			return Rect.Transform(rect, matrix);
		}
		
		public static Size TransformToDevice(this Size size, Visual visual)
		{
			Matrix matrix = PresentationSource.FromVisual(visual).CompositionTarget.TransformToDevice;
			return new Size(size.Width * matrix.M11, size.Height * matrix.M22);
		}
		
		public static Size TransformFromDevice(this Size size, Visual visual)
		{
			Matrix matrix = PresentationSource.FromVisual(visual).CompositionTarget.TransformFromDevice;
			return new Size(size.Width * matrix.M11, size.Height * matrix.M22);
		}
		
		public static Point TransformToDevice(this Point point, Visual visual)
		{
			Matrix matrix = PresentationSource.FromVisual(visual).CompositionTarget.TransformToDevice;
			return new Point(point.X * matrix.M11, point.Y * matrix.M22);
		}
		
		public static Point TransformFromDevice(this Point point, Visual visual)
		{
			Matrix matrix = PresentationSource.FromVisual(visual).CompositionTarget.TransformFromDevice;
			return new Point(point.X * matrix.M11, point.Y * matrix.M22);
		}
		#endregion
		
		#region System.Drawing <-> WPF conversions
		public static System.Drawing.Point ToSystemDrawing(this Point p)
		{
			return new System.Drawing.Point((int)p.X, (int)p.Y);
		}
		
		public static Point ToWpf(this System.Drawing.Point p)
		{
			return new Point(p.X, p.Y);
		}
		
		public static Size ToWpf(this System.Drawing.Size s)
		{
			return new Size(s.Width, s.Height);
		}
		
		public static Rect ToWpf(this System.Drawing.Rectangle rect)
		{
			return new Rect(rect.Location.ToWpf(), rect.Size.ToWpf());
		}
		#endregion
		
		[Conditional("DEBUG")]
		public static void CheckIsFrozen(Freezable f)
		{
			if (f != null && !f.IsFrozen)
				Debug.WriteLine("Performance warning: Not frozen: " + f.ToString());
		}
		
		[Conditional("DEBUG")]
		public static void Log(bool condition, string format, params object[] args)
		{
			if (condition) {
				string output = DateTime.Now.ToString("hh:MM:ss") + ": " + string.Format(format, args) + Environment.NewLine + Environment.StackTrace;
				Console.WriteLine(output);
				Debug.WriteLine(output);
			}
		}
	}
}