using Млаумчерб.Клиент.зримое;
using Timer = DTLib.Timer;

namespace Млаумчерб.Клиент.сеть;

public record struct DownloadProgress(DataSize Downloaded, DataSize Total, DataSize PerSecond)
{
    public override string ToString()
    {
        return $"{Downloaded}/{Total} ({PerSecond}/s)";
    }
}

public class NetworkProgressReporter : IDisposable
{
    private readonly Action<DownloadProgress> _reportProgressDelegate;
    private long _totalSize;
    private long _curSize;
    private long _prevSize;
    private int _timerDelay = 1000;
    private Timer _timer;
    
    public NetworkProgressReporter(long totalSize, Action<DownloadProgress> reportProgressDelegate)
    {
        _totalSize = totalSize;
        _reportProgressDelegate = reportProgressDelegate;
        _timer = new Timer(true, _timerDelay, ReportProgress);
    }

    // atomic add
    public void AddBytesCount(byte[] buffer, int offset, int count)
    {
        Interlocked.Add(ref _curSize, count);
    }
    
    public void Start()
    {
        _timer.Start();
    }

    public void Stop()
    {
        _timer.Stop();
        _timer.InvokeAction();
    }

    public void Dispose()
    {
        Stop();
    }

    void ReportProgress()
    {
        long bytesPerSec = (_curSize - _prevSize) / (_timerDelay / 1000);
        _prevSize = _curSize;
        var p = new DownloadProgress(_curSize, _totalSize, bytesPerSec);
        Приложение.Логгер.LogDebug(nameof(ReportProgress),
            $"download progress {p}");
        _reportProgressDelegate(p);
    }
}