using System;
using System.Globalization;

public class Program
{
    public static void Main()
    {
        double diameter = 100.5;
        string res = FormatDimNumber(diameter);
        Console.WriteLine($"Diameter 100.5 -> '{res}'");

        diameter = 100;
        res = FormatDimNumber(diameter);
        Console.WriteLine($"Diameter 100 -> '{res}'");
        
        diameter = 0;
        res = FormatDimNumber(diameter);
        Console.WriteLine($"Diameter 0 -> '{res}'");

        // Test BuildDimensionText
        string dimText = BuildDimensionText($"%%c{FormatDimNumber(100)}", 0.1, -0.1);
        Console.WriteLine($"Text with tol: '{dimText}'");
        
        dimText = BuildDimensionText($"%%c{FormatDimNumber(100)}", null, null);
        Console.WriteLine($"Text no tol: '{dimText}'");
        
        // Test ScaleParamBag logic (conceptually)
        double scale = 0.5;
        double val = 123.45;
        string scaledStr = (val * scale).ToString("F2");
        Console.WriteLine($"Scaled 123.45 * 0.5 -> '{scaledStr}'");
        
        if (double.TryParse(scaledStr, NumberStyles.Float, CultureInfo.InvariantCulture, out var v))
        {
            Console.WriteLine($"Parsed back (Invariant): {v}");
        }
        else if (double.TryParse(scaledStr, NumberStyles.Float, CultureInfo.CurrentCulture, out v))
        {
            Console.WriteLine($"Parsed back (Current): {v}");
        }
        else 
        {
            Console.WriteLine("Parse failed");
        }
    }

    private static string FormatDimNumber(double value)
    {
        try
        {
            return value.ToString("0.###");
        }
        catch
        {
            return value.ToString();
        }
    }

    private static string BuildDimensionText(string baseText, double? tolPlus, double? tolMinus)
    {
        if (!tolPlus.HasValue && !tolMinus.HasValue)
        {
            return baseText;
        }

        var result = baseText;

        // 公差格式: 基本尺寸 +上差/-下差
        if (tolPlus.HasValue && tolMinus.HasValue)
        {
            var plusStr = tolPlus.Value >= 0 ? $"+{tolPlus.Value}" : $"{tolPlus.Value}";
            var minusStr = tolMinus.Value >= 0 ? $"+{tolMinus.Value}" : $"{tolMinus.Value}";
            result += $"({plusStr}/{minusStr})";
        }
        else if (tolPlus.HasValue)
        {
            var plusStr = tolPlus.Value >= 0 ? $"+{tolPlus.Value}" : $"{tolPlus.Value}";
            result += $"({plusStr})";
        }
        else if (tolMinus.HasValue)
        {
            var minusStr = tolMinus.Value >= 0 ? $"+{tolMinus.Value}" : $"{tolMinus.Value}";
            result += $"({minusStr})";
        }

        return result;
    }
}