//------------------------------------------------------------------------------
//  此代码版权（除特别声明或在XREF结尾的命名空间的代码）归作者本人若汝棋茗所有
//  源代码使用协议遵循本仓库的开源协议及附加协议，若本仓库没有设置，则按MIT开源协议授权
//  CSDN博客：https://blog.csdn.net/qq_40374647
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//  Gitee源代码仓库：https://gitee.com/RRQM_Home
//  Github源代码仓库：https://github.com/RRQM
//  API首页：https://www.yuque.com/rrqm/touchsocket/index
//  交流QQ群：234762506
//  感谢您的下载和使用
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
using System;
using System.Threading;
using TouchSocket.Core;

namespace TouchSocket.Rpc.TouchRpc
{
    /// <summary>
    /// 关于具有流速的操作器。
    /// </summary>
    public abstract class FlowOperator
    {
        /// <summary>
        /// 已完成长度
        /// </summary>
        protected long completedLength;

        /// <summary>
        /// 进度
        /// </summary>
        protected float m_progress;

        private long m_speed;
        private long m_speedTemp;

        /// <summary>
        /// 已完成长度
        /// </summary>
        /// <returns></returns>
        public long CompletedLength { get => completedLength; }

        /// <summary>
        /// 由<see cref="Result"/>的结果，判断是否已结束操作。
        /// </summary>
        public virtual bool IsEnd { get => Result.ResultCode != ResultCode.Default; }

        /// <summary>
        /// 数据源的全部长度。
        /// </summary>
        public long Length { get; protected set; }

        /// <summary>
        /// 最大传输速度。
        /// </summary>
        public int MaxSpeed { get; protected set; } = int.MaxValue;

        /// <summary>
        /// 元数据
        /// </summary>
        public Metadata Metadata { get; set; }

        /// <summary>
        /// 进度
        /// </summary>
        public float Progress => m_progress;

        /// <summary>
        /// 执行结果
        /// </summary>
        public Result Result { get; protected set; }

        /// <summary>
        /// 超时时间，默认10*1000ms。
        /// </summary>
        public TimeSpan Timeout { get; set; } = TimeSpan.FromSeconds(10);

        /// <summary>
        /// 可取消令箭
        /// </summary>
        public CancellationToken Token { get; set; }

        /// <summary>
        /// 从上次获取到此次获得的速度
        /// </summary>
        /// <returns></returns>
        public long Speed()
        {
            m_speed = m_speedTemp;
            m_speedTemp = 0;
            return m_speed;
        }

        internal void SetLength(long len)
        {
            Length = len;
        }

        /// <summary>
        /// 设置结果状态
        /// </summary>
        /// <param name="result"></param>
        /// <returns></returns>
        internal Result SetResult(Result result)
        {
            Result = result;
            return result;
        }

        /// <summary>
        /// 添加流速(线程安全)
        /// </summary>
        /// <param name="flow"></param>
        protected internal virtual void AddFlow(int flow)
        {
            Interlocked.Add(ref m_speedTemp, flow);
            m_progress = (float)((double)Interlocked.Add(ref completedLength, flow) / Length);
        }
    }
}