using System.Globalization;
using System.Text;

namespace StellaOps.Canonicalization.Culture;

/// <summary>
/// Ensures all string operations use invariant culture.
/// </summary>
public static class InvariantCulture
{
    public static IDisposable Scope()
    {
        var original = CultureInfo.CurrentCulture;
        CultureInfo.CurrentCulture = CultureInfo.InvariantCulture;
        CultureInfo.CurrentUICulture = CultureInfo.InvariantCulture;
        return new CultureScope(original);
    }

    public static int Compare(string? a, string? b) => string.Compare(a, b, StringComparison.Ordinal);

    public static string FormatDecimal(decimal value) => value.ToString("G", CultureInfo.InvariantCulture);

    public static decimal ParseDecimal(string value) => decimal.Parse(value, CultureInfo.InvariantCulture);

    private sealed class CultureScope : IDisposable
    {
        private readonly CultureInfo _original;
        public CultureScope(CultureInfo original) => _original = original;
        public void Dispose()
        {
            CultureInfo.CurrentCulture = _original;
            CultureInfo.CurrentUICulture = _original;
        }
    }
}

/// <summary>
/// UTF-8 encoding utilities.
/// </summary>
public static class Utf8Encoding
{
    public static string Normalize(string input)
    {
        return input.Normalize(NormalizationForm.FormC);
    }

    public static byte[] GetBytes(string input) => Encoding.UTF8.GetBytes(Normalize(input));
}