using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SimpleToolkit.Extensions
{
    public static class StreamExtensions
    {
        public static async Task CopyToAsync(this Stream source, Stream destination, int bufferSize, IProgress<long> progress = null, CancellationToken cancellationToken = default)
        {
            ArgumentNullException.ThrowIfNull(source);
            if (!source.CanRead)
            {
                throw new ArgumentException("Has to be readable", nameof(source));
            }
            ArgumentNullException.ThrowIfNull(destination);
            if (!destination.CanWrite)
            {
                throw new ArgumentException("Has to be writable", nameof(destination));
            }
            ArgumentOutOfRangeException.ThrowIfNegative(bufferSize);

            var buffer = new byte[bufferSize];
            long totalBytesRead = 0;
            int bytesRead;
            while ((bytesRead = await source.ReadAsync(buffer, 0, buffer.Length, cancellationToken).ConfigureAwait(false)) != 0)
            {
                await destination.WriteAsync(buffer, 0, bytesRead, cancellationToken).ConfigureAwait(false);
                totalBytesRead += bytesRead;
                progress?.Report(totalBytesRead);
            }
        }
    }
}