using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

namespace Tango.Touch.Controls
{
    public class TouchClickableControl : Grid
    {
        private bool _isMouseDown;

        #region Properties

        public object CommandParameter
        {
            get { return (object)GetValue(CommandParameterProperty); }
            set { SetValue(CommandParameterProperty, value); }
        }
        public static readonly DependencyProperty CommandParameterProperty =
            DependencyProperty.Register("CommandParameter", typeof(object), typeof(TouchClickableControl), new PropertyMetadata(null));

        #endregion

        #region Routed Events

        public static readonly RoutedEvent ClickEvent = EventManager.RegisterRoutedEvent("Click", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(TouchClickableControl));
        public event RoutedEventHandler Click
        {
            add
            {
                AddHandler(ClickEvent, value);
            }
            remove
            {
                RemoveHandler(ClickEvent, value);
            }
        }

        #endregion

        #region Commands

        public ICommand Command
        {
            get { return (ICommand)GetValue(CommandProperty); }
            set { SetValue(CommandProperty, value); }
        }
        public static readonly DependencyProperty CommandProperty =
            DependencyProperty.Register("Command", typeof(ICommand), typeof(TouchClickableControl), new PropertyMetadata(null, (d, e) => (d as TouchClickableControl).OnCommandChanged()));

        #endregion

        #region Constructors

        public TouchClickableControl()
        {
            Background = Brushes.Transparent;
        }

        #endregion

        #region Private Methods

        private void OnCommandChanged()
        {
            if (Command != null)
            {
                Command.CanExecuteChanged -= Command_CanExecuteChanged;
                Command.CanExecuteChanged += Command_CanExecuteChanged;
            }
        }

        private void Command_CanExecuteChanged(object sender, EventArgs e)
        {
            IsEnabled = Command != null && Command.CanExecute(CommandParameter);
        }

        #endregion

        #region Override Methods

        protected override void OnMouseDown(MouseButtonEventArgs e)
        {
            base.OnMouseDown(e);
            _isMouseDown = true;
        }

        protected override void OnMouseUp(MouseButtonEventArgs e)
        {
            base.OnMouseUp(e);
            if (_isMouseDown)
            {
                OnClick();
            }

            _isMouseDown = false;
        }

        protected override void OnMouseLeave(MouseEventArgs e)
        {
            base.OnMouseLeave(e);
            _isMouseDown = false;
        }

        #endregion

        #region Virtual Methods

        /// <summary>
        /// Raises the click event and executes the command.
        /// </summary>
        protected virtual void OnClick()
        {
            RoutedEventArgs args = new RoutedEventArgs(TouchClickableControl.ClickEvent, this);
            RaiseEvent(args);
            if (Command != null && Command.CanExecute(CommandParameter))
            {
                Command.Execute(CommandParameter);
            }
        }

        #endregion
    }
}