using System;
using System.Runtime.CompilerServices;
using System.Runtime.ConstrainedExecution;
using System.Runtime.InteropServices;

namespace Foodsoft.Alpm
{
    internal class SafeFilePackageHandle : SafePackageHandle
    {
        internal SafeAlpmHandle SafeAlpmHandle { get; } = null!;
            
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
        [PrePrepareMethod]
        internal SafeFilePackageHandle(IntPtr ptr, SafeAlpmHandle parentHandle)
        {
            var success = false;

            RuntimeHelpers.PrepareConstrainedRegions();
            try { }
            finally
            {
                parentHandle.DangerousAddRef(ref success);
                if (success)
                {
                    SafeAlpmHandle = parentHandle;
                    handle = ptr;
                }
            }

            if (!success) throw new ObjectDisposedException(GetType().FullName);
        }

        protected override bool ReleaseHandle()
        {
            SafeAlpmHandle.DangerousRelease();
            return true;
        }
    }
}