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;
        var originalUi = CultureInfo.CurrentUICulture;
        CultureInfo.CurrentCulture = CultureInfo.InvariantCulture;
        CultureInfo.CurrentUICulture = CultureInfo.InvariantCulture;
        return new CultureScope(original, originalUi);
    }

    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;
        private readonly CultureInfo _originalUi;

        public CultureScope(CultureInfo original, CultureInfo originalUi)
        {
            _original = original;
            _originalUi = originalUi;
        }
        public void Dispose()
        {
            CultureInfo.CurrentCulture = _original;
            CultureInfo.CurrentUICulture = _originalUi;
        }
    }
}

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

    public static string Normalize(string input, NormalizationForm form)
        => input.Normalize(form);

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

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