/*
*  This file is part of aasdk library project.
*  Copyright (C) 2018 f1x.studio (Michal Szwaj)
*
*  aasdk is free software: you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 3 of the License, or
*  (at your option) any later version.

*  aasdk is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU General Public License for more details.
*
*  You should have received a copy of the GNU General Public License
*  along with aasdk. If not, see <http://www.gnu.org/licenses/>.
*/

#include <aasdk/Transport/Transport.hpp>


namespace aasdk
{
namespace transport
{

Transport::Transport(boost::asio::io_service& ioService)
    : receiveStrand_(ioService)
    , sendStrand_(ioService)
{}

void Transport::receive(size_t size, ReceivePromise::Pointer promise)
{
    receiveStrand_.dispatch([this, self = this->shared_from_this(), size, promise = std::move(promise)]() mutable {
        receiveQueue_.emplace_back(std::make_pair(size, std::move(promise)));

        if(receiveQueue_.size() == 1)
        {
            try
            {
                this->distributeReceivedData();
            }
            catch(const error::Error& e)
            {
                this->rejectReceivePromises(e);
            }
        }
    });
}

void Transport::receiveHandler(size_t bytesTransferred)
{
    try
    {
        receivedDataSink_.commit(bytesTransferred);
        this->distributeReceivedData();
    }
    catch(const error::Error& e)
    {
        this->rejectReceivePromises(e);
    }
}

void Transport::distributeReceivedData()
{
    for(auto queueElement = receiveQueue_.begin(); queueElement != receiveQueue_.end();)
    {
        if(receivedDataSink_.getAvailableSize() < queueElement->first)
        {
            auto buffer = receivedDataSink_.fill();
            this->enqueueReceive(std::move(buffer));

            break;
        }
        else
        {
            auto data(receivedDataSink_.consume(queueElement->first));
            queueElement->second->resolve(std::move(data));
            queueElement = receiveQueue_.erase(queueElement);
        }
    }
}

void Transport::rejectReceivePromises(const error::Error& e)
{
    for(auto& queueElement : receiveQueue_)
    {
        queueElement.second->reject(e);
    }

    receiveQueue_.clear();
}

void Transport::send(common::Data data, SendPromise::Pointer promise)
{
    sendStrand_.dispatch([this, self = this->shared_from_this(), data = std::move(data), promise = std::move(promise)]() mutable {
        sendQueue_.emplace_back(std::make_pair(std::move(data), std::move(promise)));

        if(sendQueue_.size() == 1)
        {
            this->enqueueSend(sendQueue_.begin());
        }
    });
}

}
}