using CPF.Mac.CoreFoundation;
using CPF.Mac.CoreGraphics;
using CPF.Mac.Foundation;
using CPF.Mac.ObjCRuntime;
using System;
using System.Runtime.InteropServices;

namespace CPF.Mac.CoreText
{
	[Since(3, 2)]
	public class CTLine : INativeObject, IDisposable
	{
		internal IntPtr handle;

		public IntPtr Handle => handle;

		public int GlyphCount => CTLineGetGlyphCount(handle);

		public NSRange StringRange => CTLineGetStringRange(handle);

		public double TrailingWhitespaceWidth => CTLineGetTrailingWhitespaceWidth(handle);

		internal CTLine(IntPtr handle, bool owns)
		{
			if (handle == IntPtr.Zero)
			{
				throw ConstructorError.ArgumentNull(this, "handle");
			}
			this.handle = handle;
			if (!owns)
			{
				CFObject.CFRetain(handle);
			}
		}

		~CTLine()
		{
			Dispose(disposing: false);
		}

		public void Dispose()
		{
			Dispose(disposing: true);
			GC.SuppressFinalize(this);
		}

		protected virtual void Dispose(bool disposing)
		{
			if (handle != IntPtr.Zero)
			{
				CFObject.CFRelease(handle);
				handle = IntPtr.Zero;
			}
		}

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern IntPtr CTLineCreateWithAttributedString(IntPtr @string);

		public CTLine(NSAttributedString value)
		{
			if (value == null)
			{
				throw ConstructorError.ArgumentNull(this, "value");
			}
			handle = CTLineCreateWithAttributedString(value.Handle);
			if (handle == IntPtr.Zero)
			{
				throw ConstructorError.Unknown(this);
			}
		}

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern IntPtr CTLineCreateTruncatedLine(IntPtr line, double width, CTLineTruncation truncationType, IntPtr truncationToken);

		public CTLine GetTruncatedLine(double width, CTLineTruncation truncationType, CTLine truncationToken)
		{
			IntPtr value = CTLineCreateTruncatedLine(handle, width, truncationType, truncationToken?.Handle ?? IntPtr.Zero);
			if (value == IntPtr.Zero)
			{
				return null;
			}
			return new CTLine(value, owns: true);
		}

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern IntPtr CTLineCreateJustifiedLine(IntPtr line, double justificationFactor, double justificationWidth);

		public CTLine GetJustifiedLine(double justificationFactor, double justificationWidth)
		{
			IntPtr value = CTLineCreateJustifiedLine(handle, justificationFactor, justificationWidth);
			if (value == IntPtr.Zero)
			{
				return null;
			}
			return new CTLine(value, owns: true);
		}

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern int CTLineGetGlyphCount(IntPtr line);

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern IntPtr CTLineGetGlyphRuns(IntPtr line);

		public CTRun[] GetGlyphRuns()
		{
			IntPtr value = CTLineGetGlyphRuns(handle);
			if (value == IntPtr.Zero)
			{
				return new CTRun[0];
			}
			return NSArray.ArrayFromHandle(value, (IntPtr v) => new CTRun(v, owns: false));
		}

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern NSRange CTLineGetStringRange(IntPtr line);

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern double CTLineGetPenOffsetForFlush(IntPtr line, double flushFactor, double flushWidth);

		public double GetPenOffsetForFlush(double flushFactor, double flushWidth)
		{
			return CTLineGetPenOffsetForFlush(handle, flushFactor, flushWidth);
		}

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern void CTLineDraw(IntPtr line, IntPtr context);

		public void Draw(CGContext context)
		{
			if (context == null)
			{
				throw new ArgumentNullException("context");
			}
			CTLineDraw(handle, context.Handle);
		}

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern CGRect CTLineGetImageBounds(IntPtr line, IntPtr context);

		public CGRect GetImageBounds(CGContext context)
		{
			if (context == null)
			{
				throw new ArgumentNullException("context");
			}
			return CTLineGetImageBounds(handle, context.Handle);
		}

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern CGRect CTLineGetBoundsWithOptions(IntPtr line, CTLineBoundsOptions options);

		[Since(6, 0)]
		public CGRect GetBounds(CTLineBoundsOptions options)
		{
			return CTLineGetBoundsWithOptions(handle, options);
		}

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern double CTLineGetTypographicBounds(IntPtr line, out double ascent, out double descent, out double leading);

		public double GetTypographicBounds(out double ascent, out double descent, out double leading)
		{
			return CTLineGetTypographicBounds(handle, out ascent, out descent, out leading);
		}

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern double CTLineGetTypographicBounds(IntPtr line, IntPtr ascent, IntPtr descent, IntPtr leading);

		public double GetTypographicBounds()
		{
			return CTLineGetTypographicBounds(handle, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
		}

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern double CTLineGetTrailingWhitespaceWidth(IntPtr line);

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern int CTLineGetStringIndexForPosition(IntPtr line, CGPoint position);

		public int GetStringIndexForPosition(CGPoint position)
		{
			return CTLineGetStringIndexForPosition(handle, position);
		}

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern double CTLineGetOffsetForStringIndex(IntPtr line, int charIndex, out double secondaryOffset);

		public double GetOffsetForStringIndex(int charIndex, out double secondaryOffset)
		{
			return CTLineGetOffsetForStringIndex(handle, charIndex, out secondaryOffset);
		}

		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreText.framework/CoreText")]
		private static extern double CTLineGetOffsetForStringIndex(IntPtr line, int charIndex, IntPtr secondaryOffset);

		public double GetOffsetForStringIndex(int charIndex)
		{
			return CTLineGetOffsetForStringIndex(handle, charIndex, IntPtr.Zero);
		}
	}
}