using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using BuzzGUI.Common;

namespace BuzzGUI.MachineView
{
	/// <summary>
	/// Interaction logic for QuickNewMachineWindow.xaml
	/// </summary>
	public partial class QuickNewMachineWindow : Window
	{
		MachineView view;
		public MachineList MachineList { get; private set; }

		public MachineListItemVM SelectedItem;

		public ICommand SelectCommand { get; private set; }

		char firstChar;
		
		public QuickNewMachineWindow(MachineView view, char firstch)
		{
			this.view = view;
			MachineList = new MachineList(view);
			DataContext = MachineList;
			InitializeComponent();

			firstChar = firstch;
		}

		T EnforceInstance<T>(string partName) where T : FrameworkElement, new()
		{
			T element = GetTemplateChild(partName) as T;
			if (element == null) element = FindName(partName) as T;
			return element;
		}

		public override void OnApplyTemplate()
		{
			base.OnApplyTemplate();

//			var textBox = FindName("PART_TextBox") as TextBox;
//			var listBox = FindName("PART_ListBox") as ListBox;
			var textBox = EnforceInstance<TextBox>("PART_TextBox");
			var listBox = EnforceInstance<ListBox>("PART_ListBox");

			Point p = Win32Mouse.GetScreenPosition();
			WindowStartupLocation = WindowStartupLocation.Manual;
			Left = p.X - Width / 2;
			Top = p.Y;

			this.PreviewKeyDown += (sender, e) =>
			{
				if (e.Key == Key.Escape)
				{
					this.DialogResult = false;
					Close();
				}
				else if (e.Key == Key.Down)
				{
					if (listBox.SelectedIndex == -1)
						listBox.SelectedIndex = 0;
					else
					{
						if (listBox.SelectedIndex < listBox.Items.Count - 1)
						{
							listBox.SelectedIndex++;
							listBox.ScrollIntoView(listBox.SelectedItem);
						}
					}
				}
				else if (e.Key == Key.Up)
				{
					if (listBox.SelectedIndex != -1 && listBox.SelectedIndex > 0)
					{
						listBox.SelectedIndex--;
						listBox.ScrollIntoView(listBox.SelectedItem);
					}
				}
				else if (e.Key == Key.Return)
				{
					SelectedItem = listBox.SelectedItem as MachineListItemVM;
					if (SelectedItem != null)
					{
						DialogResult = true;
						Close();
					}
				}

			};

			SelectCommand = new SimpleCommand
			{
				CanExecuteDelegate = x => true,
				ExecuteDelegate = id =>
				{
					SelectedItem = id as MachineListItemVM;
					DialogResult = true;
					Close();
				}
			};

			textBox.TextChanged += (sender, e) =>
			{
				MachineList.Filter = textBox.Text;
				if (listBox.Items.Count > 0)
					listBox.SelectedIndex = 0;
			};

			textBox.Text = firstChar.ToString();
			textBox.Select(textBox.Text.Length, 0);
			textBox.Focus();

		}
	}
}