using System.Diagnostics;
using iTextSharp.text.pdf;

namespace PDFPatcher.Model
{
	[DebuggerDisplay("Region={Region.Bottom},{Region.Left}; Size={Size}; Text={Text}")]
	sealed class TextInfo : ITextRegion
	{
		public Bound Region { get; set; }
		public string Text { get; set; }
		public PdfString PdfString { get; set; }
		internal float Size { get; set; }
		internal FontInfo Font { get; set; }
		internal System.Drawing.Color Color { get; set; }
		internal float LetterWidth { get; set; }

		internal static int CompareRegionX(ITextRegion a, ITextRegion b) {
			if (a == b) {
				return 0;
			}
			return CompareRegionX(a, b, true);
		}
		static int CompareRegionX(ITextRegion a, ITextRegion b, bool checkAlignment) {
			if (checkAlignment && a.Region.IsAlignedWith(b.Region, WritingDirection.Horizontal) == false) {
				return CompareRegionY(a, b, false);
			}
			var x1 = a.Region.Center;
			var x2 = b.Region.Center;
			return x1 < x2 ? -1
				: x1 == x2 ? 0
				: 1;
		}

		internal static int CompareRegionY(ITextRegion a, ITextRegion b) {
			if (a == b) {
				return 0;
			}
			return CompareRegionY(a, b, true);
		}
		static int CompareRegionY(ITextRegion a, ITextRegion b, bool checkAlignment) {
			if (checkAlignment && a.Region.IsAlignedWith(b.Region, WritingDirection.Vertical) == false) {
				return CompareRegionX(a, b, false);
			}
			var y1 = a.Region.Middle;
			var y2 = b.Region.Middle;
			return y1 > y2 ^ a.Region.IsTopDown ? -1
				: y1 == y2 ? 0
				: 1;
		}

	}

}