using System;

#if IOS || MACCATALYST

using PlatformView = UIKit.UIView;

#elif MONOANDROID

using PlatformView = Android.Views.View;

#elif WINDOWS

using PlatformView = Microsoft.UI.Xaml.FrameworkElement;

#elif TIZEN

using PlatformView = Tizen.NUI.BaseComponents.View;

#elif (NETSTANDARD || !PLATFORM) || (NET6_0_OR_GREATER && !IOS && !ANDROID && !TIZEN)

using PlatformView = System.Object;

#endif

namespace Microsoft.Maui.Handlers

{

public abstract partial class ViewHandler<TVirtualView, TPlatformView> : ViewHandler, IViewHandler

where TVirtualView : class, IView

#if !(NETSTANDARD || !PLATFORM) || IOS || ANDROID || WINDOWS || TIZEN

where TPlatformView : PlatformView

#else

where TPlatformView : class

#endif

{

[HotReload.OnHotReload]

internal static void OnHotReload()

{

}

protected ViewHandler(IPropertyMapper mapper, CommandMapper? commandMapper = null)

: base(mapper, commandMapper)

{

}

public new TPlatformView PlatformView

{

get => (TPlatformView?)base.PlatformView ?? throw new InvalidOperationException($"PlatformView cannot be null here");

private protected set => base.PlatformView = value;

}

public new TVirtualView VirtualView

{

get => (TVirtualView?)base.VirtualView ?? throw new InvalidOperationException($"VirtualView cannot be null here");

private protected set => base.VirtualView = value;

}

IView? IViewHandler.VirtualView => base.VirtualView;

IElement? IElementHandler.VirtualView => base.VirtualView;

object? IElementHandler.PlatformView => base.PlatformView;

public virtual void SetVirtualView(IView view) =>

base.SetVirtualView(view);

public sealed override void SetVirtualView(IElement view) =>

SetVirtualView((IView)view);

public static Func<ViewHandler<TVirtualView, TPlatformView>, TPlatformView>? PlatformViewFactory { get; set; }

protected abstract TPlatformView CreatePlatformView();

protected virtual void ConnectHandler(TPlatformView platformView)

{

}

protected virtual void DisconnectHandler(TPlatformView platformView)

{

}

private protected override PlatformView OnCreatePlatformView()

{

return PlatformViewFactory?.Invoke(this) ?? CreatePlatformView();

}

private protected override void OnConnectHandler(PlatformView platformView) =>

ConnectHandler((TPlatformView)platformView);

private protected override void OnDisconnectHandler(PlatformView platformView) =>

DisconnectHandler((TPlatformView)platformView);

}

}