#if IOS || MACCATALYST

using gehGassi.Toolkit.Handlers.Platforms;
using gehGassi.Toolkit.Views.ContentButton;
using Microsoft.Maui.Handlers;

using UIKit;

namespace gehGassi.Toolkit.Handlers.ContentButton
{
    public partial class ContentButtonHandler : ContentViewHandler
    {
        private bool alreadyReleased = true;
        private IContentButton virtualView => VirtualView as IContentButton;

        protected override Microsoft.Maui.Platform.ContentView CreatePlatformView()
        {
            _ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} must be set to create a {nameof(ButtonContentView)}");
            _ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} cannot be null");

            var buttonPlatformView = new ButtonContentView
            {
                CrossPlatformMeasure = VirtualView.CrossPlatformMeasure,
                CrossPlatformArrange = VirtualView.CrossPlatformArrange
            };

            buttonPlatformView.AccessibilityTraits = UIAccessibilityTrait.Button;

            buttonPlatformView.AddGestureRecognizer(new UITapGestureRecognizer(OnViewTapped));

            return buttonPlatformView;
        }

        protected override void ConnectHandler(Microsoft.Maui.Platform.ContentView platformView)
        {
            base.ConnectHandler(platformView);

            if (platformView is not ButtonContentView buttonContentView)
                return;

            buttonContentView.BeganTouching += OnBeganTouching;
            buttonContentView.EndedTouching += OnEndedTouching;
            buttonContentView.MovedTouching += OnMovedTouching;
            buttonContentView.CancelledTouching += OnEndedTouching;
        }

        protected override void DisconnectHandler(Microsoft.Maui.Platform.ContentView platformView)
        {
            base.DisconnectHandler(platformView);

            if (platformView is not ButtonContentView buttonContentView)
                return;

            buttonContentView.BeganTouching -= OnBeganTouching;
            buttonContentView.EndedTouching -= OnEndedTouching;
            buttonContentView.MovedTouching -= OnMovedTouching;
            buttonContentView.CancelledTouching -= OnEndedTouching;
        }

        private void OnBeganTouching(object sender, ContentButtonEventArgs e)
        {
            alreadyReleased = false;

            virtualView.OnPressed(e.InteractionPosition);
        }

        private void OnEndedTouching(object sender, ContentButtonEventArgs e)
        {
            if (!alreadyReleased)
            {
                virtualView.OnReleased(e.InteractionPosition);
            }

            alreadyReleased = true;
        }

        private void OnMovedTouching(object sender, ContentButtonEventArgs e)
        {
            if (!alreadyReleased && sender is ButtonContentView button && !button.Bounds.Contains(e.InteractionPosition.X, e.InteractionPosition.Y))
            {
                virtualView.OnReleased(e.InteractionPosition);
                alreadyReleased = true;
            }
        }

        private void OnViewTapped(UITapGestureRecognizer g)
        {
            var location = g.LocationInView(g.View);

            switch (g.State)
            {
                case UIGestureRecognizerState.Ended:
                    virtualView.OnPressed(new Point(location.X, location.Y));
                    virtualView.OnReleased(new Point(location.X, location.Y));
                    virtualView.OnClicked();
                    break;
                case UIGestureRecognizerState.Failed:
                    virtualView.OnPressed(new Point(location.X, location.Y));
                    virtualView.OnReleased(new Point(location.X, location.Y));
                    break;
            }
        }
    }
}

#endif