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.Media;
using System.Windows.Media.Animation;
using Tango.Core.EventArguments;
using Tango.SharedUI.Helpers;

namespace Tango.Touch.Components
{
    public static class TransformationHelper
    {
        #region TransformWhenPressed

        /// <summary>
        /// Determines whether an element is TransformWhenPressed by the drag and drop service.
        /// </summary>
        public static readonly DependencyProperty TransformWhenPressedProperty =
            DependencyProperty.RegisterAttached("TransformWhenPressed",
            typeof(bool), typeof(TransformationHelper),
            new FrameworkPropertyMetadata(false, TransformWhenPressedChanged));

        /// <summary>
        /// TransformWhenPressed changed.
        /// </summary>
        /// <param name="d">The d.</param>
        /// <param name="e">The <see cref="DependencyPropertyChangedEventArgs"/> instance containing the event data.</param>
        private static void TransformWhenPressedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if ((bool)e.NewValue)
            {
                RegisterTransformWhenPressed(d as FrameworkElement);
            }
            else
            {
                UnRegisterTransformWhenPressed(d as FrameworkElement);
            }
        }

        private static void UnRegisterTransformWhenPressed(FrameworkElement element)
        {
            
        }

        private static void RegisterTransformWhenPressed(FrameworkElement element)
        {
            element.RenderTransformOrigin = new Point(0.5, 0.5);
            element.RenderTransform = new ScaleTransform(1, 1);
            element.RegisterForPreviewMouseOrTouchDown(Element_PreviewMouseDown);
            element.PreviewMouseUp += Element_PreviewMouseUp;
            var scrollViewer = element.FindAncestor<ScrollViewer>();

            if (scrollViewer != null)
            {
                scrollViewer.ScrollChanged += (x, y) => 
                {
                    ScaleTransform scale = element.RenderTransform as ScaleTransform;
                    scale.BeginAnimation(ScaleTransform.ScaleXProperty, null);
                    scale.BeginAnimation(ScaleTransform.ScaleYProperty, null);
                };
            }
        }

        private static void Element_PreviewMouseDown(object sender, MouseOrTouchEventArgs e)
        {
            if (!GetPreventTransform(e.OriginalSource as FrameworkElement))
            {
                DoubleAnimation ani = new DoubleAnimation();
                ani.To = 1.09;
                ani.Duration = TimeSpan.FromSeconds(0.2);
                ani.AutoReverse = true;
                ScaleTransform scale = (sender as FrameworkElement).RenderTransform as ScaleTransform;
                scale.BeginAnimation(ScaleTransform.ScaleXProperty, ani);
                scale.BeginAnimation(ScaleTransform.ScaleYProperty, ani);
            }
        }

        private static void Element_PreviewMouseUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            DoubleAnimation ani = new DoubleAnimation();
            ani.To = 1;
            ani.Duration = TimeSpan.FromSeconds(0.1);
            ScaleTransform scale = (sender as FrameworkElement).RenderTransform as ScaleTransform;
            scale.BeginAnimation(ScaleTransform.ScaleXProperty, ani);
            scale.BeginAnimation(ScaleTransform.ScaleYProperty, ani);
        }

        /// <summary>
        /// Sets the TransformWhenPressed attached property.
        /// </summary>
        /// <param name="element">The element.</param>
        /// <param name="value">if set to <c>true</c> [value].</param>
        public static void SetTransformWhenPressed(FrameworkElement element, bool value)
        {
            element.SetValue(TransformWhenPressedProperty, value);
        }

        /// <summary>
        /// Gets the TransformWhenPressed attached property.
        /// </summary>
        /// <param name="element">The element.</param>
        /// <returns></returns>
        public static bool GetTransformWhenPressed(FrameworkElement element)
        {
            return (bool)element.GetValue(TransformWhenPressedProperty);
        }

        #endregion

        #region PreventTransform

        /// <summary>
        /// Determines whether an element is PreventTransform by the drag and drop service.
        /// </summary>
        public static readonly DependencyProperty PreventTransformProperty =
            DependencyProperty.RegisterAttached("PreventTransform",
            typeof(bool), typeof(TransformationHelper),
            new FrameworkPropertyMetadata(false));

        /// <summary>
        /// Sets the PreventTransform attached property.
        /// </summary>
        /// <param name="element">The element.</param>
        /// <param name="value">if set to <c>true</c> [value].</param>
        public static void SetPreventTransform(FrameworkElement element, bool value)
        {
            element.SetValue(PreventTransformProperty, value);
        }

        /// <summary>
        /// Gets the PreventTransform attached property.
        /// </summary>
        /// <param name="element">The element.</param>
        /// <returns></returns>
        public static bool GetPreventTransform(FrameworkElement element)
        {
            if (element != null)
            {
                return (bool)element.GetValue(PreventTransformProperty);
            }
            else
            {
                return false;
            }
        }

        #endregion
    }
}