#ifndef IN_OUT_INTERFACE_H
#define IN_OUT_INTERFACE_H

#include <Pacpus/kernel/InputOutputBase.h>
#include <Pacpus/kernel/Log.h>

#include <QByteArray>
#include <QCoreApplication>
#include <typeinfo>

namespace pacpus {

template <typename T, class C>
class InputInterface
    : public InputInterfaceBase
{
public:
    typedef T data_type;
    typedef C component_type;
    typedef void (C::*process_data_function_type)(const T &);

    InputInterface(QString name, C * component, process_data_function_type processMethod)
        : InputInterfaceBase(name, component, component)
        , method(processMethod)
    {
    }

    ~InputInterface()
    {
    }

    std::size_t getDataSize() const
    {
        return sizeof(T);
    }

    const std::type_info & getDataType() const
    {
        return typeid(T);
    }

    // FIXME: what's the purpose of this function?
    //PacpusEvent * getEventTemplate()
    //{
    //    return new PacpusTypedEvent<T>(TYPED_EVENT);
    //}

    // FIXME: what's the purpose of this function?
    void customEvent(QEvent * event)
    {
        // check that component has been started
        if ((NULL == getComponent()) || (!getComponent()->isActive())) {
            LOG_DEBUG("component is not active");
            return;
        }
        
        LOG_TRACE("Receiver: " << getSignature());

        //PacpusTypedEvent<T> * typedEvent = dynamic_cast<PacpusTypedEvent<T> *>(event);
        PacpusEvent * pacpusEvent = dynamic_cast<PacpusEvent *>(event);
        if (!pacpusEvent) {
            LOG_WARN("dynamic_cast failed: not a PacpusEvent");
            return;
        }
        PacpusTypedEvent<T> * typedEvent = dynamic_cast<PacpusTypedEvent<T> *>(pacpusEvent);
        if (!typedEvent) {
            LOG_WARN("dynamic_cast failed: incompatible event types");
            return;
        }

        switch (event->type()) {
        case TYPED_EVENT:
            if (TimeBounded == readingMode() && typedEvent->timerange() < 500) {
                LOG_WARN("Incorrect TimeRange (0), switch to NeverSkip");
                readingMode() = NeverSkip;
            }

            switch (readingMode()) {
            case TimeBounded:
                if (road_time() - typedEvent->time() > typedEvent->timerange()) {
                    LOG_TRACE("Data skipped, receiver: " << this->getSignature());
                    break;
                }

                (dynamic_cast<C*>(component())->*method)(typedEvent->data());
                break;

            case GetLast:
                (dynamic_cast<C*>(component())->*method)(typedEvent->data());
                // delete all remaining events
                QCoreApplication::removePostedEvents(this, TYPED_EVENT);
                break;

            case NeverSkip:
                (dynamic_cast<C*>(component())->*method)(typedEvent->data());
                break;

            default:
                LOG_WARN("Unknown reading mode " << readingMode());
                break;
            }
            break;

        // Add here new event type if needed

        default:
            LOG_WARN("Unknown event ID " << event->type());
            break;
        }
        event->accept();
    }

    // TODO for Pulling mode (not yet implemented !!!)
    T & getData()
    {
        T data;
        // TODO ask output data;
        return data;
    }

protected:
    process_data_function_type method;
};

template <typename T, class C>
class OutputInterface
    : public OutputInterfaceBase
{
public:
    typedef T data_type;
    typedef C component_type;

    OutputInterface(QString name, C * component)
        : OutputInterfaceBase(name, component, component)
    {}

    ~OutputInterface()
    {}

    /// Send data through a typed output
    void send(const T & data, road_time_t t = road_time(), road_timerange_t tr = 0);
    
    std::size_t getDataSize() const
    {
        return sizeof(T);
    }

    const std::type_info & getDataType() const
    {
        return typeid(T);
    }
};

template <typename T, class C>
void OutputInterface<T, C>::send(const T & data, road_time_t t, road_timerange_t tr)
{
    // FIXME Data Shared
    //QSharedPointer<T> sharedPointer = new T(data);

    for (QList<ConnectionBase>::iterator it = connections().begin(), itend = connections().end(); it != itend; ++it) {
        // Qt documentatino:
        //  The event must be allocated on the heap since the post event queue will take ownership of the event and delete it once it has been posted.
        //  It is not safe to access the event after it has been posted.    
        QEvent * newEvent = new PacpusTypedEvent<T>(TYPED_EVENT, data, t, tr);
        QCoreApplication::postEvent(
            it->getInterface(), 
            newEvent, 
            it->getPriority()
        );
        LOG_TRACE("Sender: " << it->getInterface()->getSignature());
    }
}

template <typename T1, typename T2, class C>
bool checkedSend(OutputInterface<T1, C> * sender, const T2 & data, road_time_t t = road_time(), road_timerange_t tr = 0);

template <typename T1, typename T2, class C>
bool checkedSend(OutputInterface<T1, C> * sender, const T2 & data, road_time_t t, road_timerange_t tr)
{
    if (sender && sender->hasConnection()) {
        sender->send(data, t, tr);
        return true;
    }
    return false;
}

} // namespace pacpus

#endif // IN_OUT_INTERFACE_H