//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
/**
 * Namespace: System.Web.UI.WebControls
 * Struct:    FontUnit
 *
 * Author:  Gaurav Vaish
 * Maintainer: gvaish@iitk.ac.in
 * Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>
 * Implementation: yes
 * Status:  100%
 *
 * (C) Gaurav Vaish (2001)
 */

using System;
using System.Collections;
using System.ComponentModel;
using System.Globalization;
using System.Web;
using System.Web.UI;

namespace System.Web.UI.WebControls
{
	[TypeConverter(typeof(FontUnitConverter))]
	public struct FontUnit
	{
		public static readonly FontUnit Empty   = new FontUnit();
		public static readonly FontUnit Large   = new FontUnit(FontSize.Large);
		public static readonly FontUnit Larger  = new FontUnit(FontSize.Larger);
		public static readonly FontUnit Medium  = new FontUnit(FontSize.Medium);
		public static readonly FontUnit Small   = new FontUnit(FontSize.Small);
		public static readonly FontUnit Smaller = new FontUnit(FontSize.Smaller);
		public static readonly FontUnit XLarge  = new FontUnit(FontSize.XLarge);
		public static readonly FontUnit XSmall  = new FontUnit(FontSize.XSmall);
		public static readonly FontUnit XXLarge = new FontUnit(FontSize.XXLarge);
		public static readonly FontUnit XXSmall = new FontUnit(FontSize.XXSmall);

		private FontSize type;
		private Unit     val;

		private static Hashtable sizeTable;

		static FontUnit ()
		{
			sizeTable = new Hashtable (CaseInsensitiveHashCodeProvider.Default,
						   CaseInsensitiveComparer.Default);
			sizeTable.Add ("smaller", 2);
			sizeTable.Add ("larger", 3);
			sizeTable.Add ("xx-small", 4);
			sizeTable.Add ("xxsmall", 4);
			sizeTable.Add ("x-small", 5);
			sizeTable.Add ("xsmall", 5);
			sizeTable.Add ("small", 6);
			sizeTable.Add ("medium", 7);
			sizeTable.Add ("large", 8);
			sizeTable.Add ("xlarge", 9);
			sizeTable.Add ("x-large", 9);
			sizeTable.Add ("xxlarge", 10);
			sizeTable.Add ("xx-large", 10);
		}

		public FontUnit(FontSize type)
		{
			if(!Enum.IsDefined(typeof(FontSize), type))
				throw new ArgumentException();
			this.type = type;
			if(this.type == FontSize.AsUnit)
			{
				val = Unit.Point(10);
			} else
			{
				val = Unit.Empty;
			}
		}

		public FontUnit(int value)
		{
			type = FontSize.AsUnit;
			val = Unit.Point(value);
		}

		public FontUnit(string value): this(value, CultureInfo.CurrentCulture)
		{
		}

		public FontUnit(Unit value)
		{
			if(value.IsEmpty)
			{
				type = FontSize.NotSet;
				val  = Unit.Empty;
			} else
			{
				type = FontSize.AsUnit;
				val  = value;
			}
		}

		public FontUnit(string value, CultureInfo culture)
		{
			type = FontSize.NotSet;
			val  = Unit.Empty;
			if(value != null && value != String.Empty)
			{
				string low = value.ToLower(culture);
				int size = GetTypeFromString(low);
				if (size != -1)
				{
					type = (FontSize)size;
				} else {
					val = new Unit(value, culture, UnitType.Point);
					type = FontSize.AsUnit;
				}
			}
		}

		private static int GetTypeFromString(string strVal)
		{
			if (!(sizeTable.ContainsKey (strVal)))
					return -1;
			return (int) sizeTable [strVal];
		}

		public static FontUnit Parse(string s)
		{
			return Parse(s, CultureInfo.CurrentCulture);
		}

		public static FontUnit Parse(string s, CultureInfo culture)
		{
			return new FontUnit(s, culture);
		}

		public static FontUnit Point(int n)
		{
			return new FontUnit(n);
		}

		public static bool operator ==(FontUnit left, FontUnit right)
		{
			return (left.type == right.type && left.val == right.val);
		}

		public static bool operator !=(FontUnit left, FontUnit right)
		{
			return !(left == right);
		}

		public static implicit operator FontUnit(int n)
		{
			return FontUnit.Point(n);
		}

		public override bool Equals(object obj)
		{
			if(obj!= null && obj is FontUnit)
			{
				FontUnit that = (FontUnit)obj;
				return (this.type == that.type && this.val == that.val);
			}
			return false;
		}

		public override int GetHashCode()
		{
			return ( (type.GetHashCode() << 2) | val.GetHashCode() );
		}

		public override string ToString()
		{
			return ToString(CultureInfo.CurrentCulture);
		}

		public string ToString(CultureInfo culture)
		{
			if(IsEmpty)
			{
				return String.Empty;
			}
			//string strRepr = String.Empty;
			switch(type)
			{
				case FontSize.AsUnit:  return val.ToString(culture);
				case FontSize.XXSmall: return "XX-Small";
				case FontSize.XSmall:  return "X-Small";
				case FontSize.XLarge:  return "X-Large";
				case FontSize.XXLarge: return "XX-Large";
				default:               return PropertyConverter.EnumToString(typeof(FontSize), type);
			}
		}

		public bool IsEmpty
		{
			get
			{
				return (type == FontSize.NotSet);
			}
		}

		public FontSize Type
		{
			get
			{
				return type;
			}
		}

		public Unit Unit
		{
			get
			{
				return val;
			}
		}
	}
}