using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Markup;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Tango.Touch.Controls;

namespace Tango.PPC.Maintenance.Controls
{
    public class ButtonState : DependencyObject
    {
        public Object Value
        {
            get { return (Object)GetValue(ValueProperty); }
            set { SetValue(ValueProperty, value); }
        }
        public static readonly DependencyProperty ValueProperty =
            DependencyProperty.Register("Value", typeof(Object), typeof(ButtonState), new PropertyMetadata(null));

        public Object Content
        {
            get { return (Object)GetValue(ContentProperty); }
            set { SetValue(ContentProperty, value); }
        }
        public static readonly DependencyProperty ContentProperty =
            DependencyProperty.Register("Content", typeof(Object), typeof(ButtonState), new PropertyMetadata(null));
    }

    [ContentProperty(nameof(States))]
    public class StateTouchButton : TouchButton
    {
        public ObservableCollection<Object> States
        {
            get { return (ObservableCollection<Object>)GetValue(StatesProperty); }
            set { SetValue(StatesProperty, value); }
        }
        public static readonly DependencyProperty StatesProperty =
            DependencyProperty.Register("States", typeof(ObservableCollection<Object>), typeof(StateTouchButton), new PropertyMetadata(null, (d, e) => (d as StateTouchButton).OnStatesChanged()));

        public Object SelectedState
        {
            get { return (Object)GetValue(SelectedStateProperty); }
            set { SetValue(SelectedStateProperty, value); }
        }
        public static readonly DependencyProperty SelectedStateProperty =
            DependencyProperty.Register("SelectedState", typeof(Object), typeof(StateTouchButton), new PropertyMetadata(null, (d, e) => (d as StateTouchButton).OnSelectedStateChanged()));

        public StateTouchButton()
        {
            States = new ObservableCollection<object>();
        }

        private void OnStatesChanged()
        {
            if (States != null)
            {
                States.CollectionChanged -= States_CollectionChanged;
                States.CollectionChanged += States_CollectionChanged;
                OnSelectedStateChanged();
            }
        }

        private void OnSelectedStateChanged()
        {
            if (SelectedState == null)
            {
                Content = null;
                return;
            }

            if (States != null)
            {
                var converter = TypeDescriptor.GetConverter(SelectedState.GetType());
                var matchingState = States.OfType<ButtonState>().ToList().FirstOrDefault(x => x.Value != null && converter.ConvertFrom(x.Value).Equals(SelectedState));
                if (matchingState != null)
                {
                    Content = matchingState.Content;
                }
                else
                {
                    Content = null;
                }
            }
            else
            {
                Content = null;
            }
        }

        private void States_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            OnSelectedStateChanged();
        }
    }
}