using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading;
using System.Windows;
using System.Windows.Media;
using SudokuWeek4.Models;

namespace SudokuWeek4
{
	internal static class NumberBrushes
	{
        // Create a dictionary for the cached brushes (per cell)
		private static readonly Dictionary<string, DrawingBrush> cachedBrushes = new Dictionary<string, DrawingBrush>();

		public static DrawingBrush GetBrush(int number, Color colorBrush)
		{
            // Check if the index is out of bounds
            if (number < 0 || number > BoardModel.GameFieldSize)
				throw new IndexOutOfRangeException();

			// Get the cached brush (if exists)
            string key = number + colorBrush.ToString();
			DrawingBrush brush;

			if (cachedBrushes.TryGetValue(key, out brush))
				return brush;

			// Create a new brush (not in cache)
			FormattedText formtxt = new FormattedText(number.ToString(), CultureInfo.CurrentCulture, FlowDirection.LeftToRight, new Typeface("Times New Roman"), 100, Brushes.Black);
			Geometry textGeometry = formtxt.BuildGeometry(new Point(0, 0));
            brush = new DrawingBrush(new GeometryDrawing(new SolidColorBrush(colorBrush), null, textGeometry));
			brush.Stretch = Stretch.Uniform;

			cachedBrushes[key] = brush;
			return brush;
		}
	}
}