/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
//  D E R E L I C T
//
/// // (c) 2003..2024

#nullable enable

using Godot;
//using Microsoft.CodeAnalysis.CSharp.Syntax;

using Godot.Collections;
using System;
using System.Collections.Generic;
using sr = System.Reflection;
using gb = Godot.Bridge;
using System.Collections.Immutable;
using System.Reflection;
using System.Collections;

public readonly struct PropertyInfo_Test
{
	public Variant.Type Type { get; init; }

	public StringName Name { get; init; }

	public PropertyHint Hint { get; init; }

	public string HintString { get; init; }

	public PropertyUsageFlags Usage { get; init; }

	public StringName? ClassName { get; init; }

	public bool Exported { get; init; }
}


//[GlobalClass]
public partial class POD<T> : GodotObject
	where T : io.Obj, new()
{

	static public gb.PropertyInfo GetPropertyInfo( Type type, string name )
	{
		var gt = Util.CSTypeCodeToGodotVariantType( Type.GetTypeCode( type ) );

		var propHint = type.IsEnum ? PropertyHint.Enum : PropertyHint.None;
		var propString = type.IsEnum ? U.EnumHintString( type ) : "";

		gb.PropertyInfo info = new(
			gt,
			name,
			propHint,
			propString,
			PropertyUsageFlags.Default,
			true
		 );

		return info;
	}

#if DOCUMENTATION
	public MethodInfo(
		StringName name,
		PropertyInfo returnVal,
		MethodFlags flags,
		List<PropertyInfo>? arguments,
		List<Variant>? defaultArguments)
#endif

	/*
	static public List<gb.MethodInfo> GetGodotMethodList()
	{
		return PODEnergyCom.GetGodotMethodList();
	}
	*/

	//*

	static public List<gb.MethodInfo> GetGodotMethodList_bad()
	{
		List<gb.MethodInfo> methods = new();

		var podType = typeof( POD<T> );

		var methodsArr = podType.GetMethods( sr.BindingFlags.DeclaredOnly | sr.BindingFlags.Public | sr.BindingFlags.NonPublic );

		foreach( var mi in methodsArr )
		{
			var retInfo = GetPropertyInfo( mi.ReturnType, "return" );

			List<gb.PropertyInfo> argsInfo = new();

			foreach( var pi in mi.GetParameters() )
			{
				//sr.ParameterInfo;
				GetPropertyInfo( pi.ParameterType, pi.Name! );
			}

			gb.MethodInfo gmi = new()
			{
				Name = mi.Name,
				Flags = MethodFlags.Default,
				ReturnVal = retInfo,
				Arguments = argsInfo

			};


			methods.Add( gmi );
		}

		//methods.AddRange( methodsArr );

		return methods;
	}
	// */

	/*
	public gb.PropertyInfo ReturnVal { get; init; }

	public MethodFlags Flags { get; init; }

	public int Id { get; init; }

	public List<gb.PropertyInfo>? Arguments { get; init; }

	public List<Variant>? DefaultArguments { get; init; }
	*/


	private T _pod;

	public T Pod
	{
		get => _pod;

		set
		{
			_pod = value;
		}
	}

#nullable disable
	public POD()
	{
		Pod = new T();
	}
#nullable enable

	public POD( T in_pod )
	{
		_pod = in_pod;
	}




	public Type GetPODType()
	{
		return typeof( T );
	}

	ImmutableDictionary<StringName, FieldInfo> _properties = ImmutableDictionary<StringName, FieldInfo>.Empty;

	//*
	public override Variant _Get( StringName property )
	{
		var dbgName = property.ToString();
		var prop = base._Get( property );

		log.info( cat: "pod", msg: $"{GetType().Name}._Get: {dbgName} = {prop}" );

		if( property == "script" && prop.VariantType == Variant.Type.Nil )
		{
			prop = Variant.CreateFrom( new StringName( $"{log.thisFilePath()}" ) );
		}
		else
		{
			//Skip this
		}

		if( _properties.TryGetValue( property, out var fi ) )
		{
			var val = fi.GetValue( _pod );
			var variant = Util.Convert( val?.GetType(), val );

			return variant;
		}

		return prop;
	}
	//*/

	public override void _Notification( int what ) =>
		base._Notification( what );

	//*
	public override Array<Dictionary> _GetPropertyList()
	{
		var other = base._GetPropertyList();

		if( other == null )
		{
			other = new();
		}

		log.info( cat: "pod", msg: $"{GetType().Name} _GetPropertyList" );

		var type = GetPODType();

		var fields = refl.GetAllFields( type );
		foreach( var fi in fields )
		{
			var tc = Type.GetTypeCode( fi.FieldType );
			var gt = Util.CSTypeCodeToGodotVariantType( tc );

			var isEnumerable = fi.FieldType.IsAssignableTo( typeof( IEnumerable ) );
			var genericCount = fi.FieldType.GenericTypeArguments.Length;

			if( isEnumerable && genericCount != 1 )
				continue;


			var sn = new StringName( $"{refl.PrettyName( fi )}" );

			var usage = PropertyUsageFlags.Default;
			var hint = !fi.FieldType.IsEnum ? PropertyHint.None : PropertyHint.Enum;
			var hintStr = !fi.FieldType.IsEnum ? "" : U.EnumHintString( fi.FieldType );


			if( typeof( T ).Name == "Com" )
			{
				if( fi.FieldType.Name == "ComType" )
					usage |= PropertyUsageFlags.ReadOnly;
			}

			if( isEnumerable )
			{
				hint = PropertyHint.ArrayType;
				hintStr = "Object";
				gt = Util.ConvertMarshalTypeToVariantType( typeof( IEnumerable ) );
			}

			if( gt == Variant.Type.Nil )
				continue;

			//usage |= PropertyUsageFlags.ReadOnly;

			var dict = U.MakeProperty( this.GetType(), sn, gt,
				hint: hint, hintString: hintStr );

			/*
			(new Godot.Collections.Dictionary()
			{
					{ "name", sn },
					{ "type", (int)gt },
					{ "usage", (int)usage },
					//{ "hint",  }
					//{ "hint_string", $"Version {pod.Meta.Version} Reason {pod.Meta.Reason}" },
			});
			*/

			_properties = _properties.Add( sn, fi );


			//dict[sn] = (long)gt;

			log.info( cat: "pod", msg: $"{GetType().Name} PropList: Add {sn} type {gt} tc {tc}" );



			other.Add( dict );
		}

		return other;
	}
	//*/

	public override bool _PropertyCanRevert( StringName property ) =>
		base._PropertyCanRevert( property );

	public override Variant _PropertyGetRevert( StringName property ) =>
		base._PropertyGetRevert( property );

	public override bool _Set( StringName property, Variant value )
	{
		return base._Set( property, value );
	}

	public override void _ValidateProperty( Dictionary property ) =>
		base._ValidateProperty( property );
	public override bool Equals( object? obj ) =>
		base.Equals( obj );
	public override int GetHashCode() =>
		base.GetHashCode();
	public override string ToString() =>
		base.ToString();
}