namespace CursorLang.Core.Services;

/// <summary>
/// Where the background half of the application lives on disk.
/// </summary>
/// <remarks>
/// Two processes now share one folder, and each of them at some point needs the path
/// of the other: the settings window registers the agent for startup and must not
/// register itself, and the agent starts the settings window from the tray menu.
/// <c>Environment.ProcessPath</c> answers the wrong question for both, so the paths
/// are worked out from the folder the assemblies were loaded from.
/// </remarks>
internal static class AgentExecutable
{
    /// <summary>The background process — the one Windows starts at sign-in.</summary>
    internal const string AgentFileName = "CursorLang.exe";

    /// <summary>The settings window, started on demand and gone when closed.</summary>
    internal const string SettingsFileName = "CursorLang.Settings.exe";

    /// <summary>
    /// The full path of the agent, or <c>null</c> when it is not next to us — which
    /// happens in the tests and would happen to a half-copied installation.
    /// </summary>
    internal static string? AgentPath => Beside(AgentFileName);

    /// <summary>The full path of the settings window, on the same terms.</summary>
    internal static string? SettingsPath => Beside(SettingsFileName);

    private static string? Beside(string fileName)
    {
        string path = Path.Combine(AppContext.BaseDirectory, fileName);
        return File.Exists(path) ? path : null;
    }
}