using System;
using Foundation;
using UIKit;
 
namespace Microsoft.Maui.Platform
{
	public class MauiDatePicker : NoCaretField
	{
#if !MACCATALYST
		readonly UIDatePickerProxy _proxy = new();
 
		public MauiDatePicker()
		{
			BorderStyle = UITextBorderStyle.RoundedRect;
			var picker = new UIDatePicker { Mode = UIDatePickerMode.Date, TimeZone = new NSTimeZone("UTC") };
 
			if (OperatingSystem.IsIOSVersionAtLeast(13, 4))
			{
				picker.PreferredDatePickerStyle = UIDatePickerStyle.Wheels;
			}
 
			this.InputView = picker;
			var accessoryView = new MauiDoneAccessoryView();
			this.InputAccessoryView = accessoryView;
 
			accessoryView.SetDataContext(this);
			accessoryView.SetDoneClicked(OnDoneClicked);
 
			this.InputView.AutoresizingMask = UIViewAutoresizing.FlexibleHeight;
			this.InputAccessoryView.AutoresizingMask = UIViewAutoresizing.FlexibleHeight;
 
			this.InputAssistantItem.LeadingBarButtonGroups = null;
			this.InputAssistantItem.TrailingBarButtonGroups = null;
 
			this.AccessibilityTraits = UIAccessibilityTrait.Button;
 
			this.EditingDidBegin += OnStarted;
			this.EditingDidEnd += OnEnded;
			picker.ValueChanged += _proxy.OnValueChanged;
		}
 
		static void OnDoneClicked(object obj)
		{
			if (obj is MauiDatePicker mdp)
				mdp.MauiDatePickerDelegate?.DoneClicked();
		}
 
		void OnEnded(object? sender, EventArgs e) =>
			MauiDatePickerDelegate?.DatePickerEditingDidEnd();
 
		void OnStarted(object? sender, EventArgs e) =>
			MauiDatePickerDelegate?.DatePickerEditingDidBegin();
 
		internal MauiDatePickerDelegate? MauiDatePickerDelegate
		{
			get => _proxy.MauiDatePickerDelegate;
			set => _proxy.MauiDatePickerDelegate = value;
		}
 
		internal UIDatePicker? DatePickerDialog { get { return InputView as UIDatePicker; } }
 
		class UIDatePickerProxy
		{
			internal MauiDatePickerDelegate? MauiDatePickerDelegate { get; set; }
 
			public void OnValueChanged(object? sender, EventArgs e) =>
				MauiDatePickerDelegate?.DatePickerValueChanged();
		}
#else
		public MauiDatePicker()
		{
			BorderStyle = UITextBorderStyle.RoundedRect;
		}
#endif
	}
}