using System;
using System.Windows;
using System.Windows.Controls;
using Tango.Core.Commands;
//using System.Collections;
using System.Linq;
using System.Collections;

namespace Tango.SharedUI.Controls
{
    public class AllSelectedCheckboxList : ListBox
    {
        #region Properties

        private ItemsControl _itemsControl;

        public ItemsControl ItemsControl
        {
            get { return _itemsControl; }
            set { _itemsControl = value; }
        }

        public bool? AllSelected
        {
            get { return (bool?)GetValue(AllSelectedProperty); }
            set
            {
                SetValue(AllSelectedProperty, value);
            }
        }

        public static readonly DependencyProperty AllSelectedProperty =
            DependencyProperty.Register("AllSelected", typeof(bool?), typeof(AllSelectedCheckboxList), new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, new PropertyChangedCallback(OnAllSelectedChanged)));


        private static void OnAllSelectedChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
        {
            AllSelectedCheckboxList l = o as AllSelectedCheckboxList;
            var nv = e.NewValue;
            l.AllSelectedChanged((bool?)nv);
        }

        public static DependencyProperty ClickCheckBoxCommandProperty = DependencyProperty.Register("ClickCheckBoxCommand", typeof(RelayCommand<object>), typeof(AllSelectedCheckboxList));
        public RelayCommand<object> ClickCheckBoxCommand
        {
            get { return (RelayCommand<object>)GetValue(ClickCheckBoxCommandProperty); }
            private set { SetValue(ClickCheckBoxCommandProperty, value); }
        }

        #endregion

        #region "Constructors"  

        static AllSelectedCheckboxList()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(AllSelectedCheckboxList), new FrameworkPropertyMetadata(typeof(AllSelectedCheckboxList)));

        }
        public AllSelectedCheckboxList() : base()
        {
            ClickCheckBoxCommand = new RelayCommand<object>(ClickCheckBox);
        }

        /// <summary>
        /// Clicks the CheckBox.Update Selection ListBoxitem.
        /// </summary>
        /// <param name="obj">The object.</param>
        private void ClickCheckBox(object obj)
        {
            if (obj is ListBoxItem)
            {
                ListBoxItem lbItem = obj as ListBoxItem;
                CheckBox checkBox = lbItem.FindVisualChildren<CheckBox>().FirstOrDefault();
                if (checkBox != null)
                {
                    bool? check = checkBox.IsChecked;
                    if (check != null)
                    {
                        lbItem.IsSelected = (bool)check;
                    }
                }
            }

            if (SelectedItems.Count == 0)
            {
                AllSelected = false;
            }
            else if (Items.Count > 0 && SelectedItems.Count == Items.Count)
            {
                AllSelected = true;
            }
            else
            {
                AllSelected = null;
            }
        }

        #endregion

        #region Override

        /// <summary>
        /// When overridden in a derived class, is invoked whenever application code or internal processes call <see cref="M:System.Windows.FrameworkElement.ApplyTemplate" />.
        /// </summary>
        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            AllSelectedChanged(AllSelected);



        }

        protected override void OnSelectionChanged(SelectionChangedEventArgs e)
        {
            base.OnSelectionChanged(e);
            foreach(var addItem in e.AddedItems.OfType<Components.SelectedObject>())
            {
                addItem.IsSelected = true;
            }
            foreach (var removeItem in e.RemovedItems.OfType<Components.SelectedObject>())
            {
                removeItem.IsSelected = false;
            }
        }

        #endregion

        private void AllSelectedChanged(bool? value)
        {
            if (value == null)
                return;
            SelectionMode = SelectionMode.Multiple;
            if (value == true)
            {
                SelectAll();
            }
            else
            {
                UnselectAll();
            }
        }
    }
}