// Copyright (C) 2015-2026 The Neo Project.
//
// LevelDBHandle.cs file belongs to the neo project and is free
// software distributed under the MIT software license, see the
// accompanying file LICENSE in the main directory of the
// repository or http://www.opensource.org/licenses/mit-license.php
// for more details.
//
// Redistribution and use in source and binary forms with or without
// modifications are permitted.

namespace Neo.IO.Data.LevelDB;

/// <summary>
/// Base class for all LevelDB objects
/// </summary>
public abstract class LevelDBHandle(nint handle) : IDisposable
{
    private bool _disposed = false;

    public nint Handle { get; private set; } = handle;

    /// <summary>
    /// Return true if haven't got valid handle
    /// </summary>
    public bool IsDisposed => _disposed || Handle == IntPtr.Zero;

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    protected abstract void FreeUnManagedObjects();

    void Dispose(bool disposing)
    {
        if (!_disposed)
        {
            _disposed = true;
            if (Handle != nint.Zero)
            {
                FreeUnManagedObjects();
                Handle = nint.Zero;
            }
        }
    }

    ~LevelDBHandle()
    {
        Dispose(false);
    }
}
