using System;
using System.ComponentModel;
using System.Globalization;
using System.Reflection;
using System.Windows.Data;

namespace MultiTerm.Wpf.ValueConverters;

public class EnumDescriptionConverter : IValueConverter
{
    private string GetEnumDescription(Enum enumObject)
    {
        FieldInfo fieldInfo = enumObject.GetType().GetField(enumObject.ToString());
        object[] attributeArray = fieldInfo.GetCustomAttributes(false);
        if(attributeArray.Length == 0)
        {
            return enumObject.ToString();
        }
        else
        {
            DescriptionAttribute attribute = attributeArray[0] as DescriptionAttribute;
            return attribute.Description;
        }
    }

    /// <summary>
    /// Convert from Data Source to Dependency Object type.
    /// Here => Enum type to object.
    /// </summary>
    /// <param name="value"></param>
    /// <param name="targetType"></param>
    /// <param name="parameter"></param>
    /// <param name="culture"></param>
    /// <returns></returns>
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        Enum myEnum = (Enum)value;
        string description = this.GetEnumDescription(myEnum);
        return description;
    }

    /// <summary>
    /// Convert from Dependency Object type to Data Source type.
    /// Here => object to Enum type.
    /// </summary>
    /// <param name="value"></param>
    /// <param name="targetType"></param>
    /// <param name="parameter"></param>
    /// <param name="culture"></param>
    /// <returns></returns>
    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        int returnValue = 0;
        if (parameter is Type)
        {
            returnValue = (int)Enum.Parse((Type)parameter, value.ToString());
        }
        return returnValue;
    }
}