#nullable disable
 
using System;
using System.Diagnostics;
 
using Microsoft.Maui.Graphics;
using Microsoft.Maui.HotReload;
using Microsoft.Maui.Layouts;
 
namespace Microsoft.Maui.Controls
{
	/// <include file="../../docs/Microsoft.Maui.Controls/ContentPage.xml" path="Type[@FullName='Microsoft.Maui.Controls.ContentPage']/Docs/*" />
	[ContentProperty("Content")]
	[DebuggerDisplay("{GetDebuggerDisplay(), nq}")]
	public partial class ContentPage : TemplatedPage, IContentView, HotReload.IHotReloadableView
	{
		/// <summary>Bindable property for <see cref="Content"/>.</summary>
		public static readonly BindableProperty ContentProperty = BindableProperty.Create(nameof(Content), typeof(View), typeof(ContentPage), null, propertyChanged: TemplateUtilities.OnContentChanged);
 
		/// <include file="../../docs/Microsoft.Maui.Controls/ContentPage.xml" path="//Member[@MemberName='Content']/Docs/*" />
		public View Content
		{
			get { return (View)GetValue(ContentProperty); }
			set { SetValue(ContentProperty, value); }
		}
 
		/// <summary>Bindable property for <see cref="HideSoftInputOnTapped"/>.</summary>
		public static readonly BindableProperty HideSoftInputOnTappedProperty
			= BindableProperty.Create(nameof(HideSoftInputOnTapped), typeof(bool), typeof(ContentPage), false);
 
		/// <summary>
		/// Gets or sets a value that indicates whether tapping anywhere on the page will cause the soft input to hide.
		/// </summary>
		public bool HideSoftInputOnTapped
		{
			get { return (bool)GetValue(HideSoftInputOnTappedProperty); }
			set { SetValue(HideSoftInputOnTappedProperty, value); }
		}
 
		public ContentPage()
		{
			this.NavigatedTo += (_, _) => UpdateHideSoftInputOnTapped();
		}
 
		protected override void OnBindingContextChanged()
		{
			base.OnBindingContextChanged();
 
			View content = Content;
			ControlTemplate controlTemplate = ControlTemplate;
			if (content != null && controlTemplate != null)
			{
				SetInheritedBindingContext(content, BindingContext);
			}
		}
 
		internal override void OnControlTemplateChanged(ControlTemplate oldValue, ControlTemplate newValue)
		{
			if (oldValue == null)
				return;
 
			base.OnControlTemplateChanged(oldValue, newValue);
			View content = Content;
			ControlTemplate controlTemplate = ControlTemplate;
			if (content != null && controlTemplate != null)
			{
				SetInheritedBindingContext(content, BindingContext);
			}
		}
 
		object IContentView.Content => Content;
		IView IContentView.PresentedContent => ((this as IControlTemplated).TemplateRoot as IView) ?? Content;
 
		protected override Size MeasureOverride(double widthConstraint, double heightConstraint)
		{
			return this.ComputeDesiredSize(widthConstraint, heightConstraint);
		}
 
		[Obsolete("Use ArrangeOverride instead")]
		protected override void LayoutChildren(double x, double y, double width, double height)
		{
			// This call is redundant when a handler is attached because the handler just calls
			// CrossPlatformArrange
			if (Handler is null)
				base.LayoutChildren(x, y, width, height);
		}
 
		protected override Size ArrangeOverride(Rect bounds)
		{
			Frame = this.ComputeFrame(bounds);
			Handler?.PlatformArrange(Frame);
			return Frame.Size;
		}
 
		Size ICrossPlatformLayout.CrossPlatformMeasure(double widthConstraint, double heightConstraint)
		{
			_ = this.MeasureContent(widthConstraint, heightConstraint);
			return new Size(widthConstraint, heightConstraint);
		}
 
		Size ICrossPlatformLayout.CrossPlatformArrange(Rect bounds)
		{
			Frame = bounds;
			this.ArrangeContent(bounds);
			return bounds.Size;
		}
 
		protected override void InvalidateMeasureOverride()
		{
			base.InvalidateMeasureOverride();
			if (Content is IView view)
			{
				view.InvalidateMeasure();
			}
		}
 
		#region HotReload
 
		IView IReplaceableView.ReplacedView => HotReload.MauiHotReloadHelper.GetReplacedView(this) ?? this;
 
		HotReload.IReloadHandler HotReload.IHotReloadableView.ReloadHandler { get; set; }
 
		void HotReload.IHotReloadableView.TransferState(IView newView)
		{
			//TODO: Let you hot reload the the ViewModel
			//TODO: Lets do a real state transfer
			if (newView is View v)
				v.BindingContext = BindingContext;
		}
 
		void HotReload.IHotReloadableView.Reload()
		{
			Dispatcher.Dispatch(() =>
			{
				this.CheckHandlers();
				var reloadHandler = ((IHotReloadableView)this).ReloadHandler;
				reloadHandler?.Reload();
				//TODO: if reload handler is null, Do a manual reload?
			});
		}
 
		#endregion
 
		Size IContentView.CrossPlatformArrange(Rect bounds)
		{
			return (this as ICrossPlatformLayout).CrossPlatformArrange(bounds);
		}
 
		Size IContentView.CrossPlatformMeasure(double widthConstraint, double heightConstraint)
		{
			return (this as ICrossPlatformLayout).CrossPlatformMeasure(widthConstraint, heightConstraint);
		}
 
		private protected override string GetDebuggerDisplay()
		{
			var contentText = DebuggerDisplayHelpers.GetDebugText(nameof(Content), Content);
			return $"{base.GetDebuggerDisplay()}, {contentText}";
		}
	}
}