using System;
using System.Collections.Concurrent;
using System.Threading;

namespace LoraGamepad.Util;
    /// <summary>
    /// 异步管道
    /// </summary>
    /// <typeparam name="T1">流入数据类型</typeparam>
    /// <typeparam name="T2">流出数据类型</typeparam>
public abstract class IAsyncPipe<T1, T2> : IPipe<T1, T2> {
    private readonly ConcurrentQueue<T1> _dataQueue = new();
    private bool _isWorking;
    private DateTime _urgeTime;
    private DateTime _workTime;
    private readonly string _threadName;
    private readonly TimeSpan _waitWorkTimeMax;
    protected IAsyncPipe(string threadName = "IAsyncPipe", long waitWorkMills = 3000) {
        _threadName = threadName;
        _waitWorkTimeMax = TimeSpan.FromMilliseconds(waitWorkMills);
    }

    /// <summary>
    /// 催工
    /// </summary>
    private void UrgeWork() {
        _urgeTime = DateTime.Now;
        if (_isWorking) {
            // 在干活?打扰了..
            return;
        }

        _isWorking = true;
        var thread = new Thread(() => {
            // 在失业的边缘反复横跳
            while (!TryStrike()) {
                // 干活
                Process(_dataQueue);
            }
        }) {
            IsBackground = true,
            Name = _threadName
        };
        thread.Start();
    }

    /// <summary>
    /// 尝试罢工
    /// </summary>
    /// <returns>是否罢工成功</returns>
    private bool TryStrike() {
        if (!_dataQueue.IsEmpty) {
            // 有活继续干
            _workTime = DateTime.Now;
        } else if (DateTime.Now - _workTime > _waitWorkTimeMax) {
            // 闲3秒罢工
            _isWorking = false;
        }

        return !_isWorking;
    }

    protected abstract void Process(ConcurrentQueue<T1> queue);

    public override void Push(T1 pack) {
        if (pack == null) {
            return;
        }

        _dataQueue.Enqueue(pack);
        UrgeWork();
    }

    /// <summary>
    /// 数据是否停止流入达到指定时间
    /// </summary>
    /// <param name="time"></param>
    /// <returns></returns>
    protected bool IsPushStop(TimeSpan time) {
        return DateTime.Now - _urgeTime > time;
    }
}