using System.Collections.Concurrent;
using System.Diagnostics.CodeAnalysis;

namespace MesETL.App.Services;

/// <summary>
/// 数据队列
/// </summary>
public class DataRecordQueue : IDisposable
{
    private readonly BlockingCollection<DataRecord> _queue;

    public int Count => _queue.Count;
    public bool IsCompleted => _queue.IsCompleted;
    public bool IsAddingCompleted => _queue.IsAddingCompleted;

    public event Action? OnRecordWrite;
    public event Action? OnRecordRead;

    public DataRecordQueue() : this(500_000) // 默认容量最大500K
    {
    }
    
    public DataRecordQueue(int boundedCapacity)
    {
        _queue = new BlockingCollection<DataRecord>(boundedCapacity); 
    }
    
    public bool TryDequeue([MaybeNullWhen(false)] out DataRecord record)
    {
        if (_queue.TryTake(out record))
        {
            OnRecordRead?.Invoke();
            return true;
        }

        return false;
    }

    public DataRecord Dequeue() => _queue.Take();

    public void CompleteAdding() => _queue.CompleteAdding();

    public void Enqueue(DataRecord record)
    {
        _queue.Add(record);
        OnRecordWrite?.Invoke();
    }


    public void Dispose()
    {
        _queue.Dispose();
    }
}