using System;
using System.Collections.Generic;
using Microsoft.Maui.Controls.Build.Tasks;
using Microsoft.Maui.Controls.Xaml;
using Microsoft.Maui.Graphics;
using Mono.Cecil.Cil;
 
namespace Microsoft.Maui.Controls.XamlC
{
	class ColorTypeConverter : ICompiledTypeConverter
	{
		public virtual IEnumerable<Instruction> ConvertFromString(string value, ILContext context, BaseNode node)
		{
			var module = context.Body.Method.Module;
 
			do
			{
				if (string.IsNullOrEmpty(value))
					break;
 
				value = value.Trim();
 
				if (value.StartsWith("#", StringComparison.Ordinal))
				{
					var color = Color.FromArgb(value);
 
					yield return Instruction.Create(OpCodes.Ldc_R4, color.Red);
					yield return Instruction.Create(OpCodes.Ldc_R4, color.Green);
					yield return Instruction.Create(OpCodes.Ldc_R4, color.Blue);
					yield return Instruction.Create(OpCodes.Ldc_R4, color.Alpha);
 
					yield return Instruction.Create(OpCodes.Newobj, module.ImportCtorReference(context.Cache, ("Microsoft.Maui.Graphics", "Microsoft.Maui.Graphics", "Color"), parameterTypes: new[] {
						("mscorlib", "System", "Single"),
						("mscorlib", "System", "Single"),
						("mscorlib", "System", "Single"),
						("mscorlib", "System", "Single")}));
					yield break;
				}
				var parts = value.Split('.');
				if (parts.Length == 1 || (parts.Length == 2 && parts[0] == "Color"))
				{
					var color = parts[parts.Length - 1];
					if (color == "lightgrey")
						color = "lightgray";
 
					if (color == "Default")
					{
						yield return Instruction.Create(OpCodes.Ldnull);
						yield break;
					}
 
					var fieldReference = module.ImportFieldReference(context.Cache, ("Microsoft.Maui.Graphics", "Microsoft.Maui.Graphics", "Colors"),
																	 color,
																	 isStatic: true,
																	 caseSensitive: false);
 
					if (fieldReference != null)
					{
						yield return Instruction.Create(OpCodes.Ldsfld, fieldReference);
						yield break;
					}
 
					var propertyGetterReference = module.ImportPropertyGetterReference(context.Cache, ("Microsoft.Maui.Graphics", "Microsoft.Maui.Graphics", "Colors"),
																					   color,
																					   isStatic: true,
																					   caseSensitive: false);
 
					if (propertyGetterReference != null)
					{
						yield return Instruction.Create(OpCodes.Call, propertyGetterReference);
						yield break;
					}
				}
			} while (false);
			throw new BuildException(BuildExceptionCode.Conversion, node, null, value, typeof(Color));
		}
	}
}