using System;
using System.Globalization;
using Avalonia.Data.Converters;

namespace DispenserUI.ViewModels.Converter;

/// <summary>
///     对象的数值转换为指定精度的字符串
/// </summary>
public class DoubleToPrecisionConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        int digits = 3; 
        if (int.TryParse(parameter as string, out int _digits))
        {
            digits = _digits;
        }

        return value switch
        {
            
            // 确保输入值是浮点数
            int => value,
            double val => Math.Round(val, digits),
            _ => value
        };
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        // 从字符串转换回浮点数
        if (value is string stringValue && double.TryParse(stringValue, out var result)) return result;

        // 如果转换失败，则返回0
        return 0d;
    }
}