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

namespace MembranePoreTester.Converters
{
    // 将 double 与 string 之间进行安全转换，避免在输入未完成时把值重置为 0
    public class DoubleStringConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null) return string.Empty;
            if (value is double d)
            {
                return d.ToString("G", culture);
            }
            return value.ToString();
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            var s = (value as string) ?? string.Empty;
            s = s.Trim();
            if (string.IsNullOrEmpty(s))
            {
                // 不强制将空字符串写回为0，避免用户输入时被覆盖
                return Binding.DoNothing;
            }

            if (double.TryParse(s, NumberStyles.Any, culture, out double result))
            {
                return result;
            }

            // 如果解析失败，不更新源
            return Binding.DoNothing;
        }
    }
}