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

namespace Tango.Graphics2D.VisualBinders
{
    public class TextBlockBinder : IVisualBinder
    {
        public void DrawVisual(FrameworkElement element, Drawing2DHost host, DrawingContext context)
        {
            TextBlock textBlock = element as TextBlock;

            double width = 0;
            double height = 0;

            List<Tuple<FormattedText, double>> runs = new List<Tuple<FormattedText, double>>();

            foreach (var run in textBlock.Inlines.OfType<Run>())
            {
                var typeface = new Typeface(
                                run.FontFamily,
                                run.FontStyle,
                                run.FontWeight,
                                run.FontStretch);

                var formattedText = new FormattedText(run.Text,
                                    CultureInfo.GetCultureInfo("en-us"),
                                    run.FlowDirection,
                                    typeface,
                                    run.FontSize,
                                    run.Foreground);

                formattedText.MaxTextWidth = host.ActualWidth;

                double w = formattedText.WidthIncludingTrailingWhitespace;

                runs.Add(new Tuple<FormattedText, double>(formattedText, w));

                width += w;
                height = Math.Max(formattedText.Height, height);
            }

            textBlock.Width = width;
            textBlock.Height = height;

            var location = host.GetElementLocation(textBlock);

            double position_x = location.X;

            foreach (var run in runs)
            {
                context.DrawText(run.Item1, new Point(position_x, location.Y));
                position_x += run.Item2;
            }
        }

        public List<DependencyProperty> GetRenderProperties()
        {
            return new List<DependencyProperty>()
            {
                TextBlock.OpacityProperty,
                TextBlock.VisibilityProperty,
                TextBlock.ForegroundProperty,
                TextBlock.TextProperty,
                TextBlock.FontSizeProperty,
                TextBlock.FontFamilyProperty,
                TextBlock.FontWeightProperty,
            };
        }
    }
}