// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System;
using System.Runtime.InteropServices;
using Microsoft.CodeAnalysis.Shared.Extensions;
using SQLitePCL;
 
namespace Microsoft.CodeAnalysis.SQLite.Interop
{
    internal sealed class SafeSqliteHandle : SafeHandle
    {
        private readonly sqlite3? _wrapper;
        private readonly SafeHandleLease _lease;
 
        public SafeSqliteHandle(sqlite3? wrapper)
            : base(invalidHandleValue: IntPtr.Zero, ownsHandle: true)
        {
            _wrapper = wrapper;
            if (wrapper is not null)
            {
                _lease = wrapper.Lease();
                SetHandle(wrapper.DangerousGetHandle());
            }
            else
            {
                _lease = default;
                SetHandle(IntPtr.Zero);
            }
        }
 
        public override bool IsInvalid => handle == IntPtr.Zero;
 
        public sqlite3 DangerousGetWrapper()
            => _wrapper!;
 
        protected override bool ReleaseHandle()
        {
            using var _ = _wrapper;
 
            _lease.Dispose();
            SetHandle(IntPtr.Zero);
            return true;
        }
    }
}