/*
 * BufferedCommunicationLink.cpp
 *
 *  Created on: 23 апр. 2020 г.
 *      Author: LeonidTitov
 */

#include "BufferedCommunicationLink.hh"
#include <climits>

communication::service::BufferedCommunicationLink::BufferedCommunicationLink(
        driver::ISlipCommunication & isc, std::pmr::memory_resource * memory, systemic::time_t timeout ) :
        communication(isc), free_counter(0), series(isc), subscribers( std::less<PacketId>(), memory ),
        timeout_after_send(timeout) {

    series_timeout.start(timeout_after_send);

}

bool communication::service::BufferedCommunicationLink::registerMessageHandler(
        IMessageHandler * handler, std::size_t packet_id ) {

    Subscribers::iterator subscriber = subscribers.find( packet_id );
    if( subscriber == subscribers.end() ) {

        subscribers.insert( subscriber, std::pair<const PacketId, IMessageHandler *>( packet_id, handler ) );
        return true;
    }

    return false;
}

void communication::service::BufferedCommunicationLink::process() {

    std::pair<bool, unsigned short> packet_info = communication.isPacketAvailable();

    if( packet_info.first ) {

        free_counter++;

        PacketId packet_id = packet_info.second;

        Subscribers::iterator subscriber = subscribers.find( packet_id );

        if( subscriber != subscribers.end() ) {
            MessageLink packet_handler( packet_id, communication, series );
            subscriber->second->handler( &packet_handler );
        }

        communication.recieveReset();

    }

    if( communication.isPacketSent() and series_timeout.delayFinished() ) {
        series.update();
        series_timeout.start(timeout_after_send);
    }

}

communication::IMessageSeriesLink::ostream & communication::service::BufferedCommunicationLink::Series::sendData(
        std::size_t size ) {

    data_sent = communication.sendHead( message_id | 0x8000u, size * ( CHAR_BIT / 8 ) );
    return communication;

}

bool communication::service::BufferedCommunicationLink::Series::charge(
        PacketId id, std::size_t num_messages, IMessageSeriesHandler * handler ) {

    if( not message_remain ) {

        message_id = id;
        series_handler = handler;
        message_remain = num_messages;

        return true;
    }

    return false;
}

void communication::service::BufferedCommunicationLink::Series::update() {

    if( series_handler and message_remain ) {

        series_handler->handler( this );

        if( data_sent ) {
            communication.sendEnd();
            --message_remain;
            data_sent = false;
        }

    }

}

driver::IRxLink & communication::service::BufferedCommunicationLink::MessageLink::getData() {

    return communication;

}

driver::ITxLink & communication::service::BufferedCommunicationLink::MessageLink::createMessage( std::size_t size ) {
    //todo: x2???
    message_answered = communication.sendHead( message_id | 0x8000u, size * ( CHAR_BIT / 8 ) );
    return communication;

}

std::size_t communication::service::BufferedCommunicationLink::MessageLink::transmitBuffCapacity() const {

    return communication.transmitBuffCapacity();

}

std::size_t communication::service::BufferedCommunicationLink::MessageLink::receiveBuffCapacity() const {

    return communication.receiveBuffCapacity();

}

bool communication::service::BufferedCommunicationLink::MessageLink::createMessageSeries(
        std::size_t num_messages, IMessageSeriesHandler * handler ) {

    return series.charge(message_id, num_messages, handler);

}

communication::service::BufferedCommunicationLink::MessageLink::MessageLink(
        PacketId id, driver::ISlipCommunication & com, Series & ser ) : message_id(id), communication(com), series(ser), message_answered(false) {}

communication::service::BufferedCommunicationLink::MessageLink::~MessageLink() noexcept {

    if( not message_answered )
        communication.sendHead( message_id | 0x8000u, 0 );

    communication.sendEnd();

}

float communication::service::BufferedCommunicationLink::getPacketCounter() const {

    return free_counter;

}

communication::service::BufferedCommunicationLink::Series::Series(
        driver::ISlipCommunication & com ) :
                communication(com), data_sent(false), message_id(), message_remain(0), series_handler(nullptr) {}