using System;

namespace SharpVectors.Dom.Svg
{
    public sealed class SvgMaskElement : SvgStyleableElement, ISvgMaskElement
    {
        #region Private Fields

        private ISvgAnimatedLength x;
        private ISvgAnimatedLength y;
        private ISvgAnimatedLength width;
        private ISvgAnimatedLength height;

        private ISvgAnimatedEnumeration maskUnits;
        private ISvgAnimatedEnumeration maskContentUnits;

        private SvgTests svgTests;
        private SvgExternalResourcesRequired svgExternalResourcesRequired;

        #endregion

        #region Constructors and Destructor

        public SvgMaskElement(string prefix, string localname, string ns, SvgDocument doc)
			: base(prefix, localname, ns, doc)
		{
			svgExternalResourcesRequired = new SvgExternalResourcesRequired(this);
			svgTests = new SvgTests(this);
		}

		#endregion

        #region ISvgElement Members

        /// <summary>
        /// Gets a value indicating whether this SVG element is renderable.
        /// </summary>
        /// <value>
        /// This is <see langword="'true"/> if the element is renderable; otherwise,
        /// it is <see langword="false"/>.
        /// </value>
        public override bool IsRenderable
        {
            get
            {
                return false;
            }
        }

        /// <summary>
        /// Gets a value providing a hint on the rendering defined by this element.
        /// </summary>
        /// <value>
        /// An enumeration of the <see cref="SvgRenderingHint"/> specifying the rendering hint.
        /// This will always return <see cref="SvgRenderingHint.Masking"/>
        /// </value>
        public override SvgRenderingHint RenderingHint
        {
            get
            {
                return SvgRenderingHint.Masking;
            }
        }

        #endregion

		#region ISvgMaskElement Members

		public ISvgAnimatedEnumeration MaskUnits 
		{
			get
			{ 
				if(maskUnits == null)
				{
					SvgUnitType mask = SvgUnitType.ObjectBoundingBox;
					if(GetAttribute("maskUnits") == "userSpaceOnUse") 
						mask = SvgUnitType.UserSpaceOnUse;
					maskUnits = new SvgAnimatedEnumeration((ushort)mask);
				}
				return maskUnits;
			}
		}

		public ISvgAnimatedEnumeration MaskContentUnits 
		{
			get
			{
				if(maskContentUnits == null)
				{
					SvgUnitType maskContent = SvgUnitType.UserSpaceOnUse;
					if(GetAttribute("maskContentUnits") == "objectBoundingBox") 
						maskContent = SvgUnitType.ObjectBoundingBox;
					maskContentUnits = new SvgAnimatedEnumeration((ushort)maskContent);
				}
				return maskContentUnits;
			}
		}

		public ISvgAnimatedLength X 
		{
			get
			{
				if(x == null)
				{
					x = new SvgAnimatedLength(this, "x", SvgLengthDirection.Horizontal, "-10%");
				}
				return x;
			}
		}

		public ISvgAnimatedLength Y 
		{
			get
			{
				if(y == null)
				{
					y = new SvgAnimatedLength(this, "y", SvgLengthDirection.Vertical, "-10%");
				}
				return y;
			}
		}

		public ISvgAnimatedLength Width 
		{
			get
			{
				if(width == null)
				{
					width = new SvgAnimatedLength(this, "width", SvgLengthDirection.Viewport, "120%");
				}
				return width;
			}
		}

		public ISvgAnimatedLength Height 
		{
			get
			{
				if(height == null)
				{
					height = new SvgAnimatedLength(this, "height", SvgLengthDirection.Viewport, "120%");
				}
				return height;
			}
		}

		#endregion

		#region ISvgExternalResourcesRequired Members

		public ISvgAnimatedBoolean ExternalResourcesRequired
		{
			get
			{
				return svgExternalResourcesRequired.ExternalResourcesRequired;
			}
		}

		#endregion

		#region ISvgTests Members

		public ISvgStringList RequiredFeatures
		{
			get { return svgTests.RequiredFeatures; }
		}

		public ISvgStringList RequiredExtensions
		{
			get { return svgTests.RequiredExtensions; }
		}

		public ISvgStringList SystemLanguage
		{
			get { return svgTests.SystemLanguage; }
		}

		public bool HasExtension(string extension)
		{
			return svgTests.HasExtension(extension);
		}

        #endregion
	}
}