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.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;

namespace Tango.Touch.Controls
{
    [ContentProperty(nameof(Content))]
    public class SliderContentControl : Slider
    {
        private bool m_isBlocked;

        #region DependencyProperties

        public UIElement Content
        {
            get { return (UIElement)GetValue(ContentProperty); }
            set { SetValue(ContentProperty, value); }
        }
        public static readonly DependencyProperty ContentProperty =
            DependencyProperty.Register("Content", typeof(UIElement), typeof(SliderContentControl), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.AffectsRender, (d, e) => (d as SliderContentControl).OnContentChanged()));

        public static readonly DependencyProperty ThumbHeightProperty =
           DependencyProperty.Register("ThumbHeight", typeof(double), typeof(SliderContentControl), new FrameworkPropertyMetadata((double)32, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));

        public double ThumbHeight
        {
            get { return (double)GetValue(ThumbHeightProperty); }
            set { SetValue(ThumbHeightProperty, value); }
        }

        public Color ThumbColor
        {
            get { return (Color)GetValue(ThumbColorProperty); }
            set { SetValue(ThumbColorProperty, value); }
        }



        /// <summary>
        /// The thumb color property
        /// </summary>
        public static readonly DependencyProperty ThumbColorProperty =
            DependencyProperty.Register("ThumbColor", typeof(Color), typeof(SliderContentControl), new UIPropertyMetadata(Colors.LightGray, null));



        #endregion

        static SliderContentControl()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(SliderContentControl), new FrameworkPropertyMetadata(typeof(SliderContentControl)));
        }
        
        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            TouchDown -= TouchDownSlider;
            TouchDown += TouchDownSlider;
            OnValueChanged(Double.NaN, Value);
            IsMoveToPointEnabled = true;
        }

        private void TouchDownSlider(object sender, TouchEventArgs e)
        {
            e.Handled = true;
        }

        private double ValidateValue(double value)
        {
            if (value >= Minimum && value <= Maximum)
                return value;
            if ((value) > Maximum)
                return Maximum;
            if ((value) < Minimum)
                return Minimum;
            return double.NaN;
        }

        private void OnContentChanged()
        {
            RemoveLogicalChild(Content);
            AddLogicalChild(Content);
        }

        protected override void OnValueChanged(double oldValue, double newValue)
        {
            if (m_isBlocked) return;

            m_isBlocked = true;

            var validatedValue = ValidateValue(newValue);

            if (!double.IsNaN(validatedValue))
            {
                Value = validatedValue;
               
            }

            m_isBlocked = false;


        }

        protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
        {
            e.Handled = true;
        }
    }
}