using System;
using System.Windows.Data;

namespace DTS.Common.Converters
{
    /// <summary>
    /// Represents a converter that converts a Boolean value to its inverse. 
    /// </summary>
    public class InverseBooleanConverter : IValueConverter
    {
        /// <summary>
        /// Modifies the source data before passing it to the target for display in the UI.
        /// </summary>
        /// <param name="value">The source data being passed to the target.</param>
        /// <param name="targetType">The System.Type of data expected by the target dependency property.</param>
        /// <param name="parameter">An optional parameter to be used in the converter logic.</param>
        /// <param name="culture">The culture of the conversion.</param>
        /// <returns>The value to be passed to the target dependency property.</returns>
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value == null) return false;
            bool val;
            bool.TryParse(value.ToString(), out val);
            return !val;
        }

        /// <summary>
        /// Modifies the target data before passing it to the source object. This method is called only in System.Windows.Data.BindingMode.TwoWay bindings.
        /// </summary>
        /// <param name="value">The target data being passed to the source.</param>
        /// <param name="targetType">The System.Type of data expected by the source object.</param>
        /// <param name="parameter">An optional parameter to be used in the converter logic.</param>
        /// <param name="culture">The culture of the conversion.</param>
        /// <returns>The value to be passed to the source object.</returns>
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value == null) return false;
            bool val;
            bool.TryParse(value.ToString(), out val);
            return !val;
        }
    }
}