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

namespace YY.Admin.Core.Converter
{
    /// <summary>
    /// 将枚举值和 bool 互转，适用于 ToggleButton 或 RadioButton
    /// </summary>
    public class EnumToBoolConverter : IValueConverter
    {
        /// <summary>
        /// 将枚举值转换为 bool
        /// </summary>
        /// <param name="value">绑定的枚举值</param>
        /// <param name="targetType"></param>
        /// <param name="parameter">ConverterParameter 指定要匹配的枚举值</param>
        /// <param name="culture"></param>
        /// <returns>匹配返回 true，否则 false</returns>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            string enumValue = value?.ToString() ?? string.Empty;
            string targetValue = parameter?.ToString() ?? string.Empty;

            return enumValue.Equals(targetValue, StringComparison.OrdinalIgnoreCase);
        }

        /// <summary>
        /// 将 bool 转回枚举值
        /// </summary>
        /// <param name="value">ToggleButton.IsChecked</param>
        /// <param name="targetType"></param>
        /// <param name="parameter">ConverterParameter 指定对应的枚举值</param>
        /// <param name="culture"></param>
        /// <returns>如果 true 返回枚举，否则返回 Binding.DoNothing</returns>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is bool isChecked && isChecked && parameter != null)
            {
                // 判断 targetType 是否是 Nullable 类型
                if (Nullable.GetUnderlyingType(targetType) != null)
                {
                    // 获取 Nullable 的基础类型
                    Type underlyingType = Nullable.GetUnderlyingType(targetType)!;

                    // 确保基础类型是枚举类型
                    if (underlyingType?.IsEnum == true)
                    {
                        return Enum.Parse(underlyingType, parameter.ToString()!);
                    }
                }
                // 如果不是枚举类型或 Nullable 类型，返回 Binding.DoNothing
                else if (targetType.IsEnum)
                {
                    return Enum.Parse(targetType, parameter.ToString()!);
                }
            }
            return Binding.DoNothing;
        }
    }
}