// Copyright (c) Microsoft Corporation. All rights reserved.

// Licensed under the MIT license.

using System;

namespace Microsoft.ClearScript.V8.SplitProxy

{

internal readonly struct V8EntityHolder

{

private readonly string name;

private readonly bool registered;

private readonly V8Entity.Handle handle;

public V8Entity.Handle Handle => (handle != V8Entity.Handle.Empty) ? handle : throw new InvalidOperationException("The " + name + " proxy has been destroyed");

public V8EntityHolder(string name, Func<V8Entity.Handle> acquireHandle)

{

this.name = name;

V8Proxy.OnEntityHolderCreated();

registered = true;

handle = acquireHandle();

}

private V8EntityHolder(string name)

{

this.name = name;

registered = false;

handle = V8Entity.Handle.Empty;

}

public void ReleaseEntity()

{

var tempHandle = handle;

if (tempHandle != V8Entity.Handle.Empty)

{

V8SplitProxyNative.InvokeNoThrow(static (instance, tempHandle) => instance.V8Entity_Release(tempHandle), tempHandle);

}

}

public static void Destroy(ref V8EntityHolder holder)

{

var tempHandle = holder.handle;

if (tempHandle != V8Entity.Handle.Empty)

{

V8SplitProxyNative.InvokeNoThrow(static (instance, tempHandle) => instance.V8Entity_DestroyHandle(tempHandle), tempHandle);

}

if (holder.registered)

{

V8Proxy.OnEntityHolderDestroyed();

}

holder = new V8EntityHolder(holder.name);

}

}

}