using System.Diagnostics;

namespace Sdt.Core;

internal static class PythonResolver
{
    public static string ResolveExecutable()
    {
        var candidates = OperatingSystem.IsWindows()
            ? new[] { "python", "py" }
            : new[] { "python3", "python" };

        foreach (var candidate in candidates)
        {
            if (CanRun(candidate))
                return candidate;
        }

        return "python";
    }

    private static bool CanRun(string exe)
    {
        try
        {
            var psi = new ProcessStartInfo
            {
                FileName = exe,
                RedirectStandardOutput = true,
                RedirectStandardError = true,
                UseShellExecute = false,
                CreateNoWindow = true,
            };
            psi.ArgumentList.Add("--version");

            using var p = new Process { StartInfo = psi };
            p.Start();
            p.WaitForExit(2000);
            return p.ExitCode == 0;
        }
        catch
        {
            return false;
        }
    }
}