//------------------------------------------------------------------------------
//  此代码版权（除特别声明或在RRQMCore.XREF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
//  交流QQ群：234762506
//  感谢您的下载和使用
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace RRQMSocket.FileTransfer
{
    /// <summary>
    /// 传输集合
    /// </summary>
    public class TransferCollection : IEnumerable<UrlFileInfo>
    {
        internal TransferCollection()
        {
            list = new List<UrlFileInfo>();
        }

        internal event RRQMMessageEventHandler OnCollectionChanged;

        private List<UrlFileInfo> list;

        /// <summary>
        /// 返回一个循环访问集合的枚举器
        /// </summary>
        /// <returns></returns>
        public IEnumerator<UrlFileInfo> GetEnumerator()
        {
            return list.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return list.GetEnumerator();
        }

        internal void Add(UrlFileInfo fileInfo)
        {
            this.list.Add(fileInfo);
            Task.Run(() =>
            {
                OnCollectionChanged?.Invoke(null, new MesEventArgs("添加"));
            });
        }

        internal void Clear()
        {
            this.list.Clear();
            Task.Run(() =>
            {
                OnCollectionChanged?.Invoke(null, new MesEventArgs("清空"));
            });
        }

        internal bool Remove(UrlFileInfo fileInfo)
        {
            Task.Run(() =>
            {
                OnCollectionChanged?.Invoke(null, new MesEventArgs("移除"));
            });
            return this.list.Remove(fileInfo);
        }

        internal bool GetFirst(out UrlFileInfo fileInfo)
        {
            lock (this)
            {
                if (this.list.Count > 0)
                {
                    fileInfo = this.list[0];
                    this.list.RemoveAt(0);
                    Task.Run(() =>
                    {
                        OnCollectionChanged?.Invoke(null, new MesEventArgs("进入传输"));
                    });
                    return true;
                }
                fileInfo = null;
                return false;
            }
        }
    }
}