#nullable disable
using System;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Reflection;
 
namespace Microsoft.Maui.Controls.Internals
{
	/// <include file="../../docs/Microsoft.Maui.Controls.Internals/DependencyResolver.xml" path="Type[@FullName='Microsoft.Maui.Controls.Internals.DependencyResolver']/Docs/*" />
	public static class DependencyResolver
	{
		static Type _defaultVisualType = typeof(VisualMarker.DefaultVisual);
		static Func<Type, object[], object> Resolver { get; set; }
 
		/// <include file="../../docs/Microsoft.Maui.Controls.Internals/DependencyResolver.xml" path="//Member[@MemberName='ResolveUsing'][1]/Docs/*" />
		public static void ResolveUsing(Func<Type, object[], object> resolver)
		{
			Resolver = resolver;
		}
 
		/// <include file="../../docs/Microsoft.Maui.Controls.Internals/DependencyResolver.xml" path="//Member[@MemberName='ResolveUsing'][2]/Docs/*" />
		public static void ResolveUsing(Func<Type, object> resolver)
		{
			Resolver = (type, objects) => resolver.Invoke(type);
		}
 
		internal static object Resolve(Type type, params object[] args)
		{
			var result = Resolver?.Invoke(type, args);
 
			if (result != null)
			{
				if (!type.IsInstanceOfType(result))
				{
					throw new InvalidCastException("Resolved instance is not of the correct type.");
				}
			}
 
			return result;
		}
 
		internal static object ResolveOrCreate(
			[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)] Type type)
				=> ResolveOrCreate(type, null, null);
 
		internal static object ResolveOrCreate(
			[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.NonPublicConstructors)] Type type,
			object source,
			Type visualType,
			params object[] args)
		{
			visualType = visualType ?? _defaultVisualType;
 
			var result = Resolve(type, args);
 
			if (result != null)
				return result;
 
			if (args.Length > 0)
			{
				if (visualType != _defaultVisualType)
					if (type.GetTypeInfo().DeclaredConstructors.Any(info => info.GetParameters().Length == 2))
						return Activator.CreateInstance(type, new[] { args[0], source });
 
				// This is by no means a general solution to matching with the correct constructor, but it'll
				// do for finding Android renderers which need Context (vs older custom renderers which may still use
				// parameterless constructors)
				if (type.GetTypeInfo().DeclaredConstructors.Any(info => info.GetParameters().Length == args.Length))
				{
					return Activator.CreateInstance(type, args);
				}
			}
 
			return Activator.CreateInstance(type);
		}
	}
}