using System;
using System.Collections.Generic;
using System.Data.Common;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Runtime.InteropServices;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;

namespace StgSharpDebug.Logic
{
#nullable enable
    
    [UnmanagedFunctionPointer(CallingConvention.Cdecl)] public delegate ref object BindingDataGetter();
    [UnmanagedFunctionPointer(CallingConvention.Cdecl)] public delegate void BindingDataSetter(ref object value);

    public unsafe struct DataBindingEntry
    {
        private IntPtr getterPtr, setterPtr;

        public DataBindingEntry(
            [NotNull] BindingDataGetter gettingCallback,
            [NotNull] BindingDataSetter settingCallback)
        {
            getterPtr = Marshal.GetFunctionPointerForDelegate(gettingCallback);
            setterPtr = Marshal.GetFunctionPointerForDelegate(settingCallback);
        }

        public ref object GetValue()
        {
            return ref ((delegate* unmanaged[Cdecl]<ref object>)getterPtr)();
        }

        public void SetData(ref object value)
        {
            ((delegate* unmanaged[Cdecl]<ref object, void>)setterPtr)(ref value);
        }

        public static DataBindingEntry NullBinding
        {
            get => new DataBindingEntry();
        }

        public bool ExactEqual(DataBindingEntry other)
        {
            return getterPtr == other.getterPtr && setterPtr == other.setterPtr;
        }
    }

#nullable restore
}