using System;
using SkiaSharp;
 
namespace Microsoft.Maui.Graphics.Skia
{
	public class SkiaCanvasStateService : IDisposable, ICanvasStateService<SkiaCanvasState>
	{
		private SKPaint _defaultFillPaint;
		private SKPaint _defaultFontPaint;
		private SKFont _defaultFontFont;
		private SKPaint _defaultStrokePaint;
 
		public SkiaCanvasState CreateNew(object context)
		{
			EnsureDefaults();
 
			var state = new SkiaCanvasState
			{
				FillPaint = _defaultFillPaint.CreateCopy(),
				StrokePaint = _defaultStrokePaint.CreateCopy(),
				FontPaint = _defaultFontPaint.CreateCopy(),
				FontFont = _defaultFontFont.CreateCopy(),
			};
 
			return state;
		}
 
		public SkiaCanvasState CreateCopy(SkiaCanvasState prototype) =>
			new SkiaCanvasState(prototype);
 
		public void Reset(SkiaCanvasState currentState)
		{
			currentState.Reset(_defaultFontPaint, _defaultFontFont, _defaultFillPaint, _defaultStrokePaint);
		}
 
		private void EnsureDefaults()
		{
			if (_defaultFillPaint != null)
				return;
 
			_defaultFillPaint = new SKPaint
			{
				Color = SKColors.White,
				IsStroke = false,
				IsAntialias = true
			};
 
			_defaultStrokePaint = new SKPaint
			{
				Color = SKColors.Black,
				StrokeWidth = 1,
				StrokeMiter = CanvasDefaults.DefaultMiterLimit,
				IsStroke = true,
				IsAntialias = true
			};
 
			_defaultFontPaint = new SKPaint
			{
				Color = SKColors.Black,
				IsAntialias = true,
#pragma warning disable CS0618 // Type or member is obsolete
				Typeface = SKTypeface.FromFamilyName("Arial")
#pragma warning restore CS0618 // Type or member is obsolete
			};
 
			_defaultFontFont = new SKFont
			{
				Typeface = SKTypeface.FromFamilyName("Arial")
			};
		}
 
		public void Dispose()
		{
			_defaultFillPaint.Dispose();
			_defaultStrokePaint.Dispose();
			_defaultFontPaint.Dispose();
			_defaultFontFont.Dispose();
		}
	}
}