using Microsoft.Maui.Controls.Internals;
using Sarand.Net.Mobile.Maui.App;
using Sarand.Net.Mobile.Maui.Controls;
using Sarand.Net.Mobile.Maui.Layouts;
using Sarand.Net.Mobile.Maui.Utils;
using Sarand.Net.Mobile.Maui.Views;
using Sarand.Net.Standard.Base.Utils;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Sarand.Net.Mobile.Maui.Panels
{
	//=======================================================================
	public class SamPanel_Page_Header : SamPanel
	{
		//-------------------------------------------------------------------
		// Definitions.

		//-------------------------------------------------------------------
		// Data members.
		// Layout.
		private SamBoxView panelBorderTop = new SamBoxView() { BackgroundColor = Sam.Visuals.Page.Header.BorderColor, HeightRequest = Sam.Visuals.Page.Header.BorderStrokeWidthTop };
		private VerticalStackLayout panelHeader = new VerticalStackLayout() { BackgroundColor = Sam.Visuals.Page.Header.BackgroundColor };
		private SamBoxView panelBorderBottom = new SamBoxView() { BackgroundColor = Sam.Visuals.Page.Header.BorderColor, HeightRequest = Sam.Visuals.Page.Header.BorderStrokeWidthBottom };
		// Grid.
		private SamGrid gridHeader = new SamGrid() { Padding = Sam.Visuals.Page.Header.Padding };
		private ColumnDefinition colLeft = new ColumnDefinition(GridLength.Star);
		private ColumnDefinition colMiddle = new ColumnDefinition(GridLength.Auto);
		private ColumnDefinition colRight = new ColumnDefinition(GridLength.Star);
		// Panels.
		private VerticalStackLayout panelLeft = new VerticalStackLayout() { HorizontalOptions = LayoutOptions.Start };
		private VerticalStackLayout panelMiddle = new VerticalStackLayout() { HorizontalOptions = LayoutOptions.Center };
		private VerticalStackLayout panelRight = new VerticalStackLayout() { HorizontalOptions = LayoutOptions.End };
		// Caption.
		private SamLabel labelCaption = new SamLabel() { HorizontalOptions = LayoutOptions.Center };
		private Sam.DisplayPosition captionDisplay = Sam.DisplayPosition.Middle;
		// Text labels.
		private SamLabel labelLeft = new SamLabel() { HorizontalOptions = LayoutOptions.Start };
		private SamLabel labelRight= new SamLabel() { HorizontalOptions = LayoutOptions.End };
		// Toolbar.
		private Sam.DisplayPosition toolbarDisplay = Sam.Visuals.Page.Header.ToolbarDisplay;
		private HorizontalStackLayout panelToolbar = new HorizontalStackLayout() { };
		private bool display_ToolbarItem_Back = Sam.Visuals.Page.Header.Display_ToolbarItem_Back;
		private Button toolbarItem_Back = new Button() { WidthRequest = 16, HeightRequest = 16, Text="<", Padding=new Thickness(0), BorderWidth = 0.0, BorderColor = Colors.DarkOliveGreen };

		//-------------------------------------------------------------------
		// Construction.
		public SamPanel_Page_Header()
		{
			InitialiseComponents();
		}

		//-------------------------------------------------------------------
		// Properties.
		public String Caption
		{
			get { return labelCaption.Text; }
			set { labelCaption.Text = value; ConfigureComponents(); }
		}
		public Sam.DisplayPosition CaptionDisplay
		{
			get { return captionDisplay; }
			set { captionDisplay = value; ConfigureComponents(); }
		}

		// Text labels.
		public String TextLeft
		{
			get { return labelLeft.Text; }
			set { labelLeft.Text = value; ConfigureComponents(); }
		}
		public String TextRight
		{
			get { return labelRight.Text; }
			set { labelRight.Text = value; ConfigureComponents(); }
		}

		// Toolbar.
		public Sam.DisplayPosition ToolbarDisplay
		{
			get { return toolbarDisplay; }
			set { toolbarDisplay = value; ConfigureComponents(); }
		}
		public bool Display_ToolbarItem_Back
		{
			get { return display_ToolbarItem_Back; }
			set { display_ToolbarItem_Back = value; ConfigureComponents(); }
		}

		//-------------------------------------------------------------------
		// Components.

		private void InitialiseComponents()
		{
			// Header panel.
			Content = panelHeader;

			// Top border.
			panelBorderTop.Margin = new Thickness(0, 0, 0, Sam.Visuals.Page.Header.Padding.Top);
			panelHeader.Children.Add(panelBorderTop);

			// Header grid.
			gridHeader.Margin = new Thickness(Sam.Visuals.Page.Header.Padding.Left, 0, Sam.Visuals.Page.Header.Padding.Right, 0);
			gridHeader.ColumnDefinitions.Add(colLeft);
			gridHeader.ColumnDefinitions.Add(colMiddle);
			gridHeader.ColumnDefinitions.Add(colRight);
			gridHeader.Add(panelLeft, 0, 0);
			gridHeader.Add(panelMiddle, 1, 0);
			gridHeader.Add(panelRight, 2, 0);
			panelHeader.Children.Add(gridHeader);

			// Bottom border.
			panelBorderBottom.Margin = new Thickness(0, Sam.Visuals.Page.Header.Padding.Bottom, 0, 0);
			panelHeader.Children.Add(panelBorderBottom);

			// Configure standard toolbar icons.
			toolbarItem_Back.Clicked += ToolbarItem_Back_Clicked;
		}

		public override void ConfigureComponents()
		{
			base.ConfigureComponents();
			bool contentDisplayed = false;

			// Caption.
			panelLeft.Children.Remove(labelCaption);
			panelMiddle.Children.Remove(labelCaption);
			panelRight.Children.Remove(labelCaption);
			if (captionDisplay != Sam.DisplayPosition.None && !StringUtil.IsBlank(labelCaption.Text))
			{
				contentDisplayed = true;
				if (captionDisplay == Sam.DisplayPosition.Left)
					panelLeft.Children.Add(labelCaption);
				else if (captionDisplay == Sam.DisplayPosition.Middle)
					panelMiddle.Children.Add(labelCaption);
				else if (captionDisplay == Sam.DisplayPosition.Right)
					panelRight.Children.Add(labelCaption);
			}

			// Text labels.
			panelLeft.Children.Remove(labelLeft);
			if (!StringUtil.IsBlank(labelLeft.Text))
			{
				contentDisplayed = true;
				panelLeft.Children.Add(labelLeft);
			}
			panelRight.Children.Remove(labelRight);
			if (!StringUtil.IsBlank(labelRight.Text))
			{
				contentDisplayed = true;
				panelRight.Children.Add(labelRight);
			}

			// Toolbar.
			panelLeft.Children.Remove(panelToolbar);
			panelMiddle.Children.Remove(panelToolbar);
			panelRight.Children.Remove(panelToolbar);
			panelToolbar.Children.Clear();

			// Toolbar icons.
			if (display_ToolbarItem_Back)
				panelToolbar.Children.Add(toolbarItem_Back);
			if (panelToolbar.Children.Any() && ToolbarDisplay != Sam.DisplayPosition.None)
			{
				contentDisplayed = true;
				if (ToolbarDisplay == Sam.DisplayPosition.Left)
					panelLeft.Children.Add(panelToolbar);
				else if (ToolbarDisplay == Sam.DisplayPosition.Middle)
					panelMiddle.Children.Add(panelToolbar);
				else if (ToolbarDisplay == Sam.DisplayPosition.Right)
					panelRight.Children.Add(panelToolbar);
			}

			// Hide panel if nothing displayed.
			if (contentDisplayed)
				IsVisible = true;
			else IsVisible = false;
		}

		//-------------------------------------------------------------------
		// Toolbar actions.

		private void ToolbarItem_Back_Clicked(object? sender, EventArgs e)
		{
			//if (Navigation.NavigationStack.Where(item => System.Object.ReferenceEquals(item, this)).Any())
			Page? page = this.GetPage();
			if (Navigation.NavigationStack.Any() && System.Object.ReferenceEquals(Navigation.NavigationStack.Last(), page))
			{
				Navigation.PopAsync();
				return;
			}
			if (Navigation.ModalStack.Where(item => System.Object.ReferenceEquals(item, page)).Any())
			{
				Navigation.PopModalAsync();
				return;
			}
		}

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