using System.Drawing;
using System.Drawing.Drawing2D;

namespace Svg
{
    /// <summary>
    /// An element used to group SVG shapes.
    /// </summary>
    [SvgElement("g")]
    public class SvgGroup : SvgVisualElement
    {
        /// <summary>
        /// Gets the <see cref="GraphicsPath"/> for this element.
        /// </summary>
        /// <value></value>
        public override System.Drawing.Drawing2D.GraphicsPath Path(ISvgRenderer renderer)
        {
            return GetPaths(this, renderer);
        }

        /// <summary>
        /// Gets the bounds of the element.
        /// </summary>
        /// <value>The bounds.</value>
        public override System.Drawing.RectangleF Bounds
        {
            get 
            { 
                var r = new RectangleF();
                foreach(var c in this.Children)
                {
                    if (c is SvgVisualElement)
                    {
                        // First it should check if rectangle is empty or it will return the wrong Bounds.
                        // This is because when the Rectangle is Empty, the Union method adds as if the first values where X=0, Y=0
                        if (r.IsEmpty)
                        {
                            r = ((SvgVisualElement)c).Bounds;
                        }
                        else
                        {
                            var childBounds = ((SvgVisualElement)c).Bounds;
                            if (!childBounds.IsEmpty)
                            {
                                r = RectangleF.Union(r, childBounds);
                            }
                        }
                    }
                }
                return TransformedBounds(r);
            }
        }

        protected override bool Renderable { get { return false; } }
                
        public override SvgElement DeepCopy()
        {
            return DeepCopy<SvgGroup>();
        }

        public override SvgElement DeepCopy<T>()
        {
            var newObj = base.DeepCopy<T>() as SvgGroup;
            if (this.Fill != null)
                newObj.Fill = this.Fill.DeepCopy() as SvgPaintServer;
            return newObj;
        }
    }
}
