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

namespace BootstrapUI.Windows.Converters
{
    /// <summary>
    /// Converts a boolean value to a font weight (false: normal, true: bold)
    /// </summary>
    public class BooleanToFontWeightConverter
        : IValueConverter
    {
        /// <summary>
        /// Converts a value.
        /// </summary>
        /// <param name="value">The value produced by the binding source.</param>
        /// <param name="targetType">The type of the binding target property.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            bool inverse = (parameter as string) == "inverse";

            var bold = value as bool?;
            if (bold.HasValue && bold.Value)
            {
                return inverse ? FontWeights.Normal : FontWeights.Bold;
            }
            return inverse ? FontWeights.Bold : FontWeights.Normal;
        }

        /// <summary>
        /// Converts a value.
        /// </summary>
        /// <param name="value">The value that is produced by the binding target.</param>
        /// <param name="targetType">The type to convert to.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotSupportedException();
        }
    }
}
