using System;
using System.IO;
using System.Linq;

namespace StellaOps.Testing;

/// <summary>
/// Ensures OpenSSL 1.1 native libraries are visible to Mongo2Go on platforms that no longer ship them.
/// </summary>
public static class OpenSslLegacyShim
{
    private const string LinuxLibraryVariable = "LD_LIBRARY_PATH";

    public static void EnsureOpenSsl11()
    {
        if (!OperatingSystem.IsLinux())
        {
            return;
        }

        var nativeDirectory = Path.Combine(AppContext.BaseDirectory, "native", "linux-x64");
        if (!Directory.Exists(nativeDirectory))
        {
            return;
        }

        var current = Environment.GetEnvironmentVariable(LinuxLibraryVariable);
        if (string.IsNullOrEmpty(current))
        {
            Environment.SetEnvironmentVariable(LinuxLibraryVariable, nativeDirectory);
            return;
        }

        const char separator = ':';
        var segments = current.Split(separator, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
        if (segments.Contains(nativeDirectory, StringComparer.Ordinal))
        {
            return;
        }

        Environment.SetEnvironmentVariable(LinuxLibraryVariable, string.Concat(nativeDirectory, separator, current));
    }
}