using System;
using System.Drawing;

namespace DevComponents.DotNetBar
{
	/// <summary>
	/// Summary description for SimpleElementLayout.
	/// </summary>
	internal class SimpleElementLayout
	{
        internal static void LayoutSimpleElement(SimpleElementLayoutInfo info)
        {
            Size textsize = Size.Empty;
            Font font = info.Font;
            int height = 0;
            if (info.LayoutStyle.Font != null)
                font = info.LayoutStyle.Font;

            // Calculate Text Width and Height
            string text = info.Element.Text;
            if (info.Element.FixedWidth == 0)
            {
                if (info.Element.TextVisible)
                {
                    if (!string.IsNullOrEmpty(text))
                    {
                        textsize = TextDrawing.MeasureString(info.Graphics, text, font);
                        //textSize=info.Graphics.MeasureString(text,font);
                        if (info.LayoutStyle != null && !info.LayoutStyle.TextShadowColor.IsEmpty && !info.LayoutStyle.TextShadowOffset.IsEmpty)
                            textsize.Height += info.LayoutStyle.TextShadowOffset.Y;
                        info.Element.TextSize = textsize;
                    }
                }
            }
            else
            {
                int availTextWidth = info.Element.FixedWidth -
                    ElementStyleLayout.HorizontalStyleWhiteSpace(info.LayoutStyle);

                if (info.Element.ImageVisible)
                    availTextWidth -= info.Element.ImageLayoutSize.Width;

                if (info.Element.TextVisible)
                {
                    int elementHeight = font.Height;
                    if (info.LayoutStyle != null && !info.LayoutStyle.TextShadowColor.IsEmpty && !info.LayoutStyle.TextShadowOffset.IsEmpty)
                        elementHeight += info.LayoutStyle.TextShadowOffset.Y;

                    if (info.LayoutStyle.WordWrap)
                    {
                        elementHeight = info.LayoutStyle.MaximumHeight - info.LayoutStyle.MarginTop -
                                      info.LayoutStyle.MarginBottom - info.LayoutStyle.PaddingTop - info.LayoutStyle.PaddingBottom;
                        if (availTextWidth > 0)
                        {
                            if (elementHeight > 0)
                            {
                                textsize = TextDrawing.MeasureString(info.Graphics, text, font,
                                    new Size(availTextWidth, elementHeight), info.LayoutStyle.TextFormat);
                            }
                            else
                                textsize = TextDrawing.MeasureString(info.Graphics, text, font, availTextWidth, info.LayoutStyle.TextFormat);
                            info.Element.TextSize = textsize;
                        }
                    }
                    else
                    {
                        if (!string.IsNullOrEmpty(text))
                            info.Element.TextSize = TextDrawing.MeasureString(info.Graphics, text, font);
                        textsize = new Size(availTextWidth, elementHeight);
                    }
                }
            }

            if (info.Element.TextVisible && !info.LayoutStyle.TextShadowColor.IsEmpty)
            {
                textsize.Height += info.LayoutStyle.TextShadowOffset.Y;
            }
            height = textsize.Height;

            if (info.VerticalPartAlignment)
            {
                if (info.Element.ImageVisible && info.Element.ImageLayoutSize.Height > 0)
                    height += info.Element.ImageLayoutSize.Height;
            }
            else
            {
                if (info.Element.ImageVisible && info.Element.ImageLayoutSize.Height > height)
                    height = info.Element.ImageLayoutSize.Height;
            }

            Rectangle r = new Rectangle(info.Left + ElementStyleLayout.LeftWhiteSpace(info.LayoutStyle),
                info.Top + ElementStyleLayout.TopWhiteSpace(info.LayoutStyle)
                , info.Element.FixedWidth - ElementStyleLayout.HorizontalStyleWhiteSpace(info.LayoutStyle), height);

            if (r.Width == 0)
            {
                if (info.VerticalPartAlignment)
                {
                    if (info.Element.TextVisible)
                        r.Width = textsize.Width;
                    if (info.Element.ImageVisible && info.Element.ImageLayoutSize.Width > r.Width)
                        r.Width = (info.Element.ImageLayoutSize.Width + info.Element.ImageTextSpacing);
                }
                else
                {
                    if (info.Element.TextVisible)
                        r.Width = textsize.Width;
                    if (info.Element.ImageVisible && info.Element.ImageLayoutSize.Width > 0)
                        r.Width += (info.Element.ImageLayoutSize.Width + info.Element.ImageTextSpacing);
                }
            }

            // Now that we have element bounds store them
            Rectangle rElementBounds = new Rectangle(info.Left, info.Top, info.Element.FixedWidth, r.Height + info.LayoutStyle.MarginTop + info.LayoutStyle.MarginBottom + info.LayoutStyle.PaddingTop + info.LayoutStyle.PaddingBottom);
            if (rElementBounds.Width == 0)
                rElementBounds.Width = r.Width + ElementStyleLayout.HorizontalStyleWhiteSpace(info.LayoutStyle);
            info.Element.Bounds = rElementBounds;

            // Set Position of the image
            if (info.Element.ImageVisible && !info.Element.ImageLayoutSize.IsEmpty)
            {
                eVerticalAlign va = GetImageVerticalAlign(info.Element.ImageAlignment);
                eHorizontalAlign ha = GetImageHorizontalAlign(info.Element.ImageAlignment, info.LeftToRight);
                if (info.VerticalPartAlignment)
                    info.Element.ImageBounds = AlignContentVertical(info.Element.ImageLayoutSize, ref r, ha, va, info.Element.ImageTextSpacing);
                else
                    info.Element.ImageBounds = AlignContent(info.Element.ImageLayoutSize, ref r, ha, va, info.Element.ImageTextSpacing);
            }
            else
                info.Element.ImageBounds = Rectangle.Empty;


            // Set position of the text
            if (!textsize.IsEmpty)
                info.Element.TextBounds = r;
            else
                info.Element.TextBounds = Rectangle.Empty;

        }

		private static Rectangle AlignContent(System.Drawing.Size contentSize, ref Rectangle boundingRectangle, eHorizontalAlign horizAlign, eVerticalAlign vertAlign, int contentSpacing)
		{
			Rectangle contentRect=new Rectangle(Point.Empty,contentSize);
			switch(horizAlign)
			{
				case eHorizontalAlign.Right:
				{
					contentRect.X=boundingRectangle.Right-contentRect.Width;
					boundingRectangle.Width-=(contentRect.Width+contentSpacing);
					break;
				}
					//case eHorizontalAlign.Left:
				default:
				{
					contentRect.X=boundingRectangle.X;
					boundingRectangle.X=contentRect.Right+contentSpacing;
					boundingRectangle.Width-=(contentRect.Width+contentSpacing);
					break;
				}
					//				case eHorizontalAlign.Center:
					//				{
					//					contentRect.X=boundingRectangle.X+(boundingRectangle.Width-contentRect.Width)/2;
					//					break;
					//				}
			}

			switch(vertAlign)
			{
				case eVerticalAlign.Top:
				{
					contentRect.Y=boundingRectangle.Y;
					break;
				}
				case eVerticalAlign.Middle:
				{
					contentRect.Y=boundingRectangle.Y+(boundingRectangle.Height-contentRect.Height)/2;
					break;
				}
				case eVerticalAlign.Bottom:
				{
					contentRect.Y=boundingRectangle.Bottom-contentRect.Height;
					break;
				}
			}

			return contentRect;
		}

		private static Rectangle AlignContentVertical(System.Drawing.Size contentSize, ref Rectangle boundingRectangle, eHorizontalAlign horizAlign, eVerticalAlign vertAlign, int contentSpacing)
		{
			Rectangle contentRect=new Rectangle(Point.Empty,contentSize);
			switch(horizAlign)
			{
				case eHorizontalAlign.Left:
				{
					contentRect.X=boundingRectangle.X;
					break;
				}
				case eHorizontalAlign.Right:
				{
					contentRect.X=boundingRectangle.Right-contentRect.Width;
					break;
				}
				case eHorizontalAlign.Center:
				{
					contentRect.X=boundingRectangle.X+(boundingRectangle.Width-contentRect.Width)/2;
					break;
				}
			}

			switch(vertAlign)
			{
				case eVerticalAlign.Bottom:
				{
					contentRect.Y=boundingRectangle.Bottom-contentRect.Height;
					boundingRectangle.Height-=(contentRect.Height+contentSpacing);
					break;
				}
					//case eVerticalAlign.Top:
				default:
				{
					contentRect.Y=boundingRectangle.Y;
					boundingRectangle.Y=contentRect.Bottom+contentSpacing;
					boundingRectangle.Height-=(contentRect.Height+contentSpacing);
					break;
				}
					//				case eVerticalAlign.Middle:
					//				{
					//					contentRect.Y=boundingRectangle.Y+(boundingRectangle.Height-contentRect.Height)/2;
					//					break;
					//				}
			}

			return contentRect;
		}

		private static eHorizontalAlign GetImageHorizontalAlign(eSimplePartAlignment align, bool leftToRight)
		{
			if(((align==eSimplePartAlignment.NearBottom || align==eSimplePartAlignment.NearCenter ||
				align==eSimplePartAlignment.NearTop) && leftToRight) ||
				((align==eSimplePartAlignment.FarBottom || align==eSimplePartAlignment.FarCenter ||
				align==eSimplePartAlignment.FarTop) && !leftToRight))
				return eHorizontalAlign.Left;
			else if(align==eSimplePartAlignment.CenterBottom || align==eSimplePartAlignment.CenterTop)
				return eHorizontalAlign.Center;
			return eHorizontalAlign.Right;
		}

		private static eVerticalAlign GetImageVerticalAlign(eSimplePartAlignment align)
		{
			eVerticalAlign va=eVerticalAlign.Middle;

			switch(align)
			{
				case eSimplePartAlignment.FarBottom:
				case eSimplePartAlignment.NearBottom:
				case eSimplePartAlignment.CenterBottom:
					va=eVerticalAlign.Bottom;
					break;
				case eSimplePartAlignment.FarTop:
				case eSimplePartAlignment.NearTop:
				case eSimplePartAlignment.CenterTop:
					va=eVerticalAlign.Top;
					break;
			}

			return va;
		}

		/// <summary>
		/// Indicates absolute vertical alignment of the content.
		/// </summary>
		private enum eVerticalAlign
		{
			/// <summary>
			/// Content is aligned to the top
			/// </summary>
			Top,
			/// <summary>
			/// Content is aligned in the middle
			/// </summary>
			Middle,
			/// <summary>
			/// Content is aligned at the bottom
			/// </summary>
			Bottom
		}

		/// <summary>
		/// Indicates absolute horizontal alignment
		/// </summary>
		private enum eHorizontalAlign
		{
			/// <summary>
			/// Content is left aligned
			/// </summary>
			Left,
			/// <summary>
			/// Content is centered
			/// </summary>
			Center,
			/// <summary>
			/// Content is right aligned
			/// </summary>
			Right
		}
	}

	/// <summary>Indicates alignment of a part of the cell like image or check box in relation to the text.</summary>
	public enum eSimplePartAlignment:int
	{
		/// <summary>
		/// Part is aligned to the left center of the text assuming left-to-right
		/// orientation.
		/// </summary>
		NearCenter=0,
		/// <summary>
		/// Part is aligned to the right center of the text assuming left-to-right
		/// orientation.
		/// </summary>
		FarCenter=1,
		/// <summary>
		/// Part is aligned to the top left of the text assuming left-to-right
		/// orientation.
		/// </summary>
		NearTop=2,
		/// <summary>Part is aligned above the text and centered.</summary>
		CenterTop=3,
		/// <summary>
		/// Part is aligned to the top right of the text assuming left-to-right
		/// orientation.
		/// </summary>
		FarTop=4,
		/// <summary>
		/// Part is aligned to the bottom left of the text assuming left-to-right
		/// orientation.
		/// </summary>
		NearBottom=5,
		/// <summary>Part is aligned below the text and centered.</summary>
		CenterBottom=6,
		/// <summary>
		/// Part is aligned to the bottom right of the text assuming left-to-right
		/// orientation.
		/// </summary>
		FarBottom=7
	}

	internal class SimpleElementLayoutInfo
	{
		public ISimpleElement Element=null;
		public System.Drawing.Graphics Graphics=null;
		public System.Drawing.Font Font=null;
		public int Left=0;
		public int Top=0;
		public ElementStyle LayoutStyle=null;
		public bool LeftToRight=true;
		public bool VerticalPartAlignment=false;
	}
}