namespace Renci.SshNet.IntegrationTests
{
    internal class RemoteSshd
    {
        private readonly IConnectionInfoFactory _connectionInfoFactory;

        public RemoteSshd(IConnectionInfoFactory connectionInfoFactory)
        {
            _connectionInfoFactory = connectionInfoFactory;
        }

        public RemoteSshdConfig OpenConfig()
        {
            return new RemoteSshdConfig(this, _connectionInfoFactory);
        }

        public RemoteSshd Restart()
        {
            // Restart SSH daemon
            using (var client = new SshClient(_connectionInfoFactory.Create()))
            {
                client.Connect();

                // Kill all processes that start with 'sshd' and that run as root
                var stopCommand = client.CreateCommand("sudo pkill -9 -U 0 sshd.pam");
                var stopOutput = stopCommand.Execute();
                if (stopCommand.ExitStatus != 0)
                {
                    throw new ApplicationException($"Stopping ssh service failed with exit code {stopCommand.ExitStatus}.\r\n{stopOutput}\r\n{stopCommand.Error}");
                }

                var resetFailedCommand = client.CreateCommand("sudo /usr/sbin/sshd.pam");
                var resetFailedOutput = resetFailedCommand.Execute();
                if (resetFailedCommand.ExitStatus != 0)
                {
                    throw new ApplicationException($"Reset failures for ssh service failed with exit code {resetFailedCommand.ExitStatus}.\r\n{resetFailedOutput}\r\n{resetFailedCommand.Error}");
                }
            }

            // Socket fails on Linux, reporting inability early. This is the Linux behavior by design.
            // https://github.com/dotnet/runtime/issues/47484#issuecomment-769239699
            // At this point we have to wait until the ssh server in the container is available after reconfiguration.
            if (Environment.OSVersion.Platform == PlatformID.Unix)
            {
                Thread.Sleep(300);
            }

            return this;
        }
    }
}