using Sarand.Net.Mobile.Maui.Views;
using Sarand.Net.Standard.Base.Utils;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;

namespace Sarand.Net.Mobile.Maui.Panels
{
	//=======================================================================
	public class SamPanel_Tabbed : SamPanel
	{
		//-------------------------------------------------------------------
		// Definitions.
		private class TabPanelData
		{
			public TabPanelData(int tabPos, SamPanel_TabCaption tabCaptionPanel, SamPanel_Tab tabPanel)
			{
				TabPos = tabPos;
				TabCaptionPanel = tabCaptionPanel;
				TabPanel = tabPanel;
			}
			public int TabPos { get; }
			public SamPanel_TabCaption TabCaptionPanel { get; }
			public SamPanel_Tab TabPanel { get; }
		}

		/// <summary>
		/// Tab Caption panel
		/// </summary>
		public class SamPanel_TabCaption : SamPanel
		{
			// Properties.
			private SamPanel_Tabbed TabbedPanel { get; }
			public int TabPos { get; }
			public String Caption { get; }
			// Data members.
			private static readonly Color ActiveBackgroundColor = Colors.WhiteSmoke;
			private static readonly Color ActiveBorderColor = Colors.DarkSlateBlue;
			private static readonly Color InactiveBackgroundColor = Colors.LightGray;
			private static readonly Color InactiveBorderColor = Colors.SlateBlue;
			private Border border = new Border() { Stroke = InactiveBorderColor, StrokeThickness = 2.0 };
			private TapGestureRecognizer tabCaptionTapGesture = new TapGestureRecognizer();
			public SamPanel_TabCaption(SamPanel_Tabbed tabbedPanel, int tabPos, String caption)
			{
				TabbedPanel = tabbedPanel;
				TabPos = tabPos;
				Caption = caption;
				Content = border;
				tabCaptionTapGesture.Tapped += TabCaptionTapGesture_Tapped;
				GestureRecognizers.Add(tabCaptionTapGesture);
				Deactivate();
			}
			private void TabCaptionTapGesture_Tapped(object? sender, TappedEventArgs e)
			{
				TabbedPanel.TabCaptionTapped(sender, e, TabPos);
			}
			public void Activate()
			{
				BackgroundColor = ActiveBackgroundColor;
				border.Stroke = ActiveBorderColor;
			}
			public void Deactivate()
			{
				BackgroundColor = InactiveBackgroundColor;
				border.Stroke = InactiveBorderColor;
			}
		}

		//-------------------------------------------------------------------
		// Data members.

		// Content.
		private VerticalStackLayout contentStack = new VerticalStackLayout() { };
		private HorizontalStackLayout panelTabCaptions = new HorizontalStackLayout() { Spacing = 8.0 };
		private ScrollView scrollTabPanels = new ScrollView() { };
		private VerticalStackLayout panelTabPanels = new VerticalStackLayout() { };

		// Tab panels.
		private int tabCount = 0;
		private readonly List<TabPanelData> tabPanels = new List<TabPanelData>();

		//-------------------------------------------------------------------
		// Construction.
		public SamPanel_Tabbed()
		{
			// Content.
			Content = contentStack;

			// Tab captions.
			contentStack.Children.Add(panelTabCaptions);

			// Tab panels.
			contentStack.Children.Add(scrollTabPanels);
			scrollTabPanels.Content = panelTabPanels;
		}

		//-------------------------------------------------------------------
		// Properties.

		//-------------------------------------------------------------------
		// Manage tabs.

		public void AddTabPanel(String caption, SamPanel_Tab tabPanel)
		{
			tabCount++;

			// Tab caption.
			if (StringUtil.IsBlank(caption))
				caption = $"Tab #{tabCount}";
			SamPanel_TabCaption panelTabCaption = new SamPanel_TabCaption(this, tabCount, caption);
			panelTabCaptions.Children.Add(panelTabCaption);

			// Tab panel.
			panelTabPanels.Children.Add(tabPanel);

			// Tab panel data.
			TabPanelData tabPanelData = new TabPanelData(tabCount, panelTabCaption, tabPanel);
			tabPanels.Add(tabPanelData);

			if (tabCount == 1)
			{
				panelTabCaption.Activate();
			}
		}

		public void ClearTabPanels()
		{
			tabCount = 0;
			tabPanels.Clear();
			panelTabCaptions.Children.Clear();
			panelTabPanels.Children.Clear();
		}

		//-------------------------------------------------------------------
		// Actions.

		private void TabCaptionTapped(object? sender, TappedEventArgs e, int tabPos)
		{
			foreach (TabPanelData tabPanel in tabPanels)
			{
				if (tabPanel.TabPos == tabPos)
				{
					tabPanel.TabCaptionPanel.Activate();
					tabPanel.TabPanel.IsVisible = true;
				}
				else
				{
					tabPanel.TabCaptionPanel.Deactivate();
					tabPanel.TabPanel.IsVisible = false;
				}
			}
		}

		//-------------------------------------------------------------------
		//              C o n f i g u r e   C o m p o n e n t s
		//-------------------------------------------------------------------
		public override void ConfigureComponents()
		{
			base.ConfigureComponents();
		}

		//-------------------------------------------------------------------
		//                  C o n t r o l   A c t i v i t y
		//-------------------------------------------------------------------
		public override void SetControlActivity()
		{
		}
		public override void SetControlsReadOnly()
		{
		}

		//-------------------------------------------------------------------
		//                      P a n e l   E v e n t s
		//-------------------------------------------------------------------
		protected override void OnParentSet()
		{
			base.OnParentSet();
		}

		//-------------------------------------------------------------------
		protected override void OnPropertyChanging([CallerMemberName] string propertyName = "")
		{
			base.OnPropertyChanging(propertyName);
		}
		protected override void OnPropertyChanged([CallerMemberName] string propertyName = "")
		{
			base.OnPropertyChanged(propertyName);
		}

		//-------------------------------------------------------------------
		protected override void OnChildAdded(Element child)
		{
			base.OnChildAdded(child);
		}
		protected override void OnChildRemoved(Element child, int oldLogicalIndex)
		{
			base.OnChildRemoved(child, oldLogicalIndex);
		}

		//-------------------------------------------------------------------
		protected override void OnSizeAllocated(double width, double height)
		{
			base.OnSizeAllocated(width, height);
		}

		//-------------------------------------------------------------------
	}
	//=======================================================================
}