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.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace Tango.FSE.Statistics.Controls
{
    public class RangeProgressBar : Control
    {
        private Border _innerBorder;
        private Border _outerBorder;

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

        public Brush FillBrush
        {
            get { return (Brush)GetValue(FillBrushProperty); }
            set { SetValue(FillBrushProperty, value); }
        }
        public static readonly DependencyProperty FillBrushProperty =
            DependencyProperty.Register("FillBrush", typeof(Brush), typeof(RangeProgressBar), new PropertyMetadata(Brushes.Red));

        public double Maximum
        {
            get { return (double)GetValue(MaximumProperty); }
            set { SetValue(MaximumProperty, value); }
        }
        public static readonly DependencyProperty MaximumProperty =
            DependencyProperty.Register("Maximum", typeof(double), typeof(RangeProgressBar), new PropertyMetadata(100.0));

        public double LowerValue
        {
            get { return (double)GetValue(LowerValueProperty); }
            set { SetValue(LowerValueProperty, value); }
        }
        public static readonly DependencyProperty LowerValueProperty =
            DependencyProperty.Register("LowerValue", typeof(double), typeof(RangeProgressBar), new PropertyMetadata(20.0));

        public double UpperValue
        {
            get { return (double)GetValue(UpperValueProperty); }
            set { SetValue(UpperValueProperty, value); }
        }
        public static readonly DependencyProperty UpperValueProperty =
            DependencyProperty.Register("UpperValue", typeof(double), typeof(RangeProgressBar), new PropertyMetadata(80.0));

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
            _innerBorder = GetTemplateChild("PART_InnerBorder") as Border;
            _outerBorder = GetTemplateChild("PART_OuterBorder") as Border;

            PlaceInnerBorder();
            SizeChanged -= RangeProgressBar_SizeChanged;
            SizeChanged += RangeProgressBar_SizeChanged;
        }

        private void RangeProgressBar_SizeChanged(object sender, SizeChangedEventArgs e)
        {
            PlaceInnerBorder();
        }

        private void PlaceInnerBorder()
        {
            double leftMargin = LowerValue / Maximum * _outerBorder.ActualWidth;
            double rightMargin = _outerBorder.ActualWidth - (UpperValue / Maximum * _outerBorder.ActualWidth);
            leftMargin = Double.IsNaN(leftMargin) ? 0 : leftMargin;
            rightMargin = Double.IsNaN(rightMargin) ? 0 : rightMargin;

            _innerBorder.Margin = new Thickness(leftMargin, 0, rightMargin, 0);
        }
    }
}