/* ========================================================================
 * Copyright (c) 2005-2025 The OPC Foundation, Inc. All rights reserved.
 *
 * OPC Foundation MIT License 1.00
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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 * OTHER DEALINGS IN THE SOFTWARE.
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 * The complete license agreement can be found here:
 * http://opcfoundation.org/License/MIT/1.00/
 * ======================================================================*/

using System;
using System.Threading;

namespace Opc.Ua.Client
{
    /// <summary>
    /// Defines a reconnection policy for ManagedSession.
    /// Controls backoff timing, retry limits, and jitter for
    /// automatic reconnection attempts.
    /// </summary>
    public interface IReconnectPolicy
    {
        /// <summary>
        /// Get the delay before the next reconnection attempt.
        /// </summary>
        /// <param name="attempt">Zero-based attempt number.</param>
        /// <param name="ct">Cancellation token.</param>
        /// <returns>Delay before next attempt, or null to stop retrying.</returns>
        TimeSpan? GetNextDelay(int attempt, CancellationToken ct = default);

        /// <summary>
        /// Reset the policy state (e.g., after successful reconnection).
        /// </summary>
        void Reset();
    }
}