using System.Runtime.InteropServices;

namespace EmbyToolbox.Interop;

/// <summary>Вызов SetCurrentProcessExplicitAppUserModelID до показа окон/unpackaged toasts Windows.</summary>
internal static class AppUserModelIdRegistration
{
    [DllImport("shell32.dll", CharSet = CharSet.Unicode, ExactSpelling = true, SetLastError = false)]
    private static extern int SetCurrentProcessExplicitAppUserModelID(string appID);

    public static string? LastRegisteredId { get; private set; }
    public static int LastHr { get; private set; }
    public static string? LastDiagnostics { get; private set; }

    /// <returns>true, если получен код 0 (S_OK).</returns>
    public static bool TryRegister(string appUserModelId)
    {
        LastDiagnostics = null;
        if (!OperatingSystem.IsWindowsVersionAtLeast(6, 1))
        {
            LastDiagnostics = "требуется Windows.";
            LastHr = -1;
            return false;
        }

        try
        {
            var hr = SetCurrentProcessExplicitAppUserModelID(appUserModelId);
            LastHr = hr;
            LastRegisteredId = hr == 0 ? appUserModelId : null;

            if (hr != 0)
            {
                LastDiagnostics =
                    $"SetCurrentProcessExplicitAppUserModelID вернул 0x{hr:X8} для «{appUserModelId}».";
                return false;
            }

            return true;
        }
        catch (Exception ex)
        {
            LastHr = -2;
            LastDiagnostics = $"{ex.GetType().Name}: {ex.Message}";
            LastRegisteredId = null;
            return false;
        }
    }
}