using System;
using System.Globalization;
using System.Windows;
using System.Windows.Data;

namespace ModernWpf.Controls.Primitives
{
    public class PlacementRectangleConverter : IMultiValueConverter
    {
        public Thickness Margin { get; set; }

        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            if (values.Length == 2 &&
                values[0] is double width &&
                values[1] is double height)
            {
                var margin = Margin;
                var topLeft = new Point(margin.Left, margin.Top);
                var bottomRight = new Point(width - margin.Right, height - margin.Bottom);
                var rect = new Rect(topLeft, bottomRight);
                return rect;
            }

            return Rect.Empty;
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}
