class Async::HTTP::Protocol::HTTP2::Stream

def initialize(delegate, *args)
	super(*args)
	
	@delegate = delegate
	
	@body = body
	@remainder = nil
	
	@task = nil
end

def receive_data(frame)
	data = super
	
	if data
		delegate.receive_data(self, data, frame.end_stream?)
	end
	
	return data
end

def receive_headers(frame)
	headers = super
	
	delegate.receive_headers(self, headers, frame.end_stream?)
	
	return headers
end

def receive_reset_stream(frame)
	error_code = super
	
	if @body
		@body.close(EOFError.new(error_code))
		@body = nil
	end
	
	delegate.receive_reset_stream(self, error_code)
	
	return error_code
end

def send_body(body, task: Async::Task.current)
	# TODO Might need to stop this task when body is cancelled.
	@task = task.async do
		@body = body
		
		window_updated
	end
end

def send_chunk
	maximum_size = self.available_frame_size
	
	if maximum_size == 0
		return false
	end
	
	if @remainder
		chunk = @remainder
		@remainder = nil
	elsif chunk = @body.read
		# There was a new chunk of data to send
	else
		if @body
			@body.close
			@body = nil
		end
		
		# @body.read above might take a while and a stream reset might be received in the mean time.
		unless closed?
			send_data(nil, ::HTTP::Protocol::HTTP2::END_STREAM)
		end
		
		return false
	end
	
	return false if closed?
	
	if chunk.bytesize <= maximum_size
		send_data(chunk, maximum_size: maximum_size)
	else
		send_data(chunk.byteslice(0, maximum_size), maximum_size: maximum_size)
		
		@remainder = chunk.byteslice(maximum_size, chunk.bytesize - maximum_size)
	end
	
	return true
end

def window_updated
	return unless @body
	
	while send_chunk
		# There could be more data to send...
	end
end