using System;
using System.Runtime.InteropServices;

namespace PorygonSharp.DiagnosticHandling
{
    public class DiagnosticItem
    {
        [StructLayout(LayoutKind.Sequential)]
        public struct InternalRepresentation
        {
            private readonly int            _severity;
            private readonly DiagnosticCode _code;
            private readonly uint           _start;
            private readonly uint           _length;

            public DiagnosticCode GetCode()
            {
                return _code;
            }
        }

        private InternalRepresentation _internalRepresentation;
        private readonly IntPtr _handle;

        private bool _initialed;

        private InternalRepresentation Internal
        {
            get
            {
                if (!_initialed)
                {
                    _internalRepresentation = Marshal.PtrToStructure<InternalRepresentation>(_handle);
                }
                _initialed = true;
                return _internalRepresentation;
            }
        }

        internal DiagnosticItem(IntPtr handle)
        {
            _handle = handle;
        }

        internal IntPtr GetHandle()
        {
            return _handle;
        }

        public DiagnosticCode GetCode()
        {
            return Internal.GetCode();
        }
    }
}