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 * Copyright (c) 2025, Sjofn LLC.
 * All rights reserved.
 *
 * - Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
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 *   of its contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 */

using System;
using System.Threading.Tasks;
using System.Threading;

namespace LibreMetaverse
{
    internal static class Repeat
    {
        /// <summary>
        /// Execute a given <see cref="Action"/> at a given interval in a loop
        /// </summary>
        /// <param name="pollInterval">Interval for executing action</param>
        /// <param name="action">Essentially the action you wish to execute</param>
        /// <param name="token">Cancellation token</param>
        /// <param name="immediately">When set, executes the action immediately instead of waiting for the interval</param>
        /// <returns></returns>
        public static Task Interval(
            TimeSpan pollInterval,
            Action action,
            CancellationToken token,
            bool immediately = false)
        {
            return Task.Factory.StartNew(
                () =>
                {
                    if (immediately) { action(); }

                    for (; ; )
                    {
                        if (token.WaitCancellationRequested(pollInterval)) { break; }
                        action();
                    }
                }, token, TaskCreationOptions.LongRunning, TaskScheduler.Default);
        }

        /// <summary>
        /// Execute a given <see cref="Action"/> at a given interval in a loop
        /// </summary>
        /// <param name="pollInterval">Interval for executing action</param>
        /// <param name="asyncAction">Essentially the action you wish to execute</param>
        /// <param name="token">Cancellation token</param>
        /// <param name="immediately">When set, executes the action immediately instead of waiting for the interval</param>
        /// <returns></returns>
        public static Task IntervalAsync(
            TimeSpan pollInterval,
            Func<Task> asyncAction,
            CancellationToken token,
            bool immediately = false)
        {
            return Task.Factory.StartNew(
                async () =>
                {
                    if (immediately)
                    {
                        await asyncAction(); }

                    for (; ; )
                    {
                        if (token.WaitCancellationRequested(pollInterval)) { break; }
                        await asyncAction();
                    }
                }, token, TaskCreationOptions.LongRunning, TaskScheduler.Default);
        }
    }

    internal static class CancellationTokenExtensions
    {
        public static bool WaitCancellationRequested(
            this CancellationToken token,
            TimeSpan timeout)
        {
            return token.WaitHandle.WaitOne(timeout);
        }
    }
}