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#include "qscriptdebuggerfrontend_p.h"

#include "qscriptdebuggerfrontend_p_p.h"

#include "qscriptdebuggercommand_p.h"

#include "qscriptdebuggerevent_p.h"

#include "qscriptdebuggerresponse_p.h"

#include "qscriptdebuggereventhandlerinterface_p.h"

#include "qscriptdebuggerresponsehandlerinterface_p.h"

#include <QtCore/qcoreevent.h>

#include <QtCore/qcoreapplication.h>

QT_BEGIN_NAMESPACE

/*!

  \class QScriptDebuggerFrontend

  \since 4.5

  \internal

  \brief The QScriptDebuggerFrontend class is the base class of debugger front-ends.

*/

// helper class that's used to handle our custom Qt events

class QScriptDebuggerFrontendEventReceiver : public QObject

{

public:

    QScriptDebuggerFrontendEventReceiver(QScriptDebuggerFrontendPrivate *frontend,

                                         QObject *parent = 0);

    ~QScriptDebuggerFrontendEventReceiver();

    bool event(QEvent *);

private:

    QScriptDebuggerFrontendPrivate *m_frontend;

};

QScriptDebuggerFrontendEventReceiver::QScriptDebuggerFrontendEventReceiver(

    QScriptDebuggerFrontendPrivate *frontend, QObject *parent)

    : QObject(parent), m_frontend(frontend)

{

}

QScriptDebuggerFrontendEventReceiver::~QScriptDebuggerFrontendEventReceiver()

{

}

bool QScriptDebuggerFrontendEventReceiver::event(QEvent *e)

{

    return m_frontend->event(e);

}

QScriptDebuggerFrontendPrivate::QScriptDebuggerFrontendPrivate()

{

    eventHandler = 0;

    nextCommandId = 0;

    eventReceiver = new QScriptDebuggerFrontendEventReceiver(this);

}

QScriptDebuggerFrontendPrivate::~QScriptDebuggerFrontendPrivate()

{

    delete eventReceiver;

}

void QScriptDebuggerFrontendPrivate::postEvent(QEvent *e)

{

    QCoreApplication::postEvent(eventReceiver, e);

}

bool QScriptDebuggerFrontendPrivate::event(QEvent *e)

{

    Q_Q(QScriptDebuggerFrontend);

    if (e->type() == QEvent::User+1) {

        QScriptDebuggerEventEvent *de = static_cast<QScriptDebuggerEventEvent*>(e);

        bool handled = q->notifyEvent(de->event());

        if (handled) {

            q->scheduleCommand(QScriptDebuggerCommand::resumeCommand(),

                               /*responseHandler=*/0);

        }

        return true;

    } else if (e->type() == QEvent::User+2) {

        processCommands();

        return true;

    }

    return false;

}

void QScriptDebuggerFrontendPrivate::processCommands()

{

    Q_Q(QScriptDebuggerFrontend);

    while (!pendingCommands.isEmpty()) {

        QScriptDebuggerCommand command(pendingCommands.takeFirst());

        int id = pendingCommandIds.takeFirst();

        q->processCommand(id, command);

    }

}

QScriptDebuggerFrontend::QScriptDebuggerFrontend()

    : d_ptr(new QScriptDebuggerFrontendPrivate())

{

    d_ptr->q_ptr = this;

}

QScriptDebuggerFrontend::~QScriptDebuggerFrontend()

{

}

QScriptDebuggerFrontend::QScriptDebuggerFrontend(QScriptDebuggerFrontendPrivate &dd)

    : d_ptr(&dd)

{

    d_ptr->q_ptr = this;

}

QScriptDebuggerEventHandlerInterface *QScriptDebuggerFrontend::eventHandler() const

{

    Q_D(const QScriptDebuggerFrontend);

    return d->eventHandler;

}

void QScriptDebuggerFrontend::setEventHandler(QScriptDebuggerEventHandlerInterface *eventHandler)

{

    Q_D(QScriptDebuggerFrontend);

    d->eventHandler = eventHandler;

}

/*!

  Schedules the given \a command for execution by this front-end,

  and returns a unique identifier associated with this command.

  Subclasses can call this function to schedule custom commands.

  \sa notifyCommandFinished()

*/

int QScriptDebuggerFrontend::scheduleCommand(

    const QScriptDebuggerCommand &command,

    QScriptDebuggerResponseHandlerInterface *responseHandler)

{

    Q_D(QScriptDebuggerFrontend);

    int id = ++d->nextCommandId;

    d->pendingCommands.append(command);

    d->pendingCommandIds.append(id);

    if (responseHandler)

        d->responseHandlers.insert(id, responseHandler);

    if (d->pendingCommands.size() == 1) {

        QEvent *e = new QEvent(QEvent::Type(QEvent::User+2)); // ProcessCommands

        d->postEvent(e);

    }

    return id;

}

/*!

  Subclasses should call this function when the command identified by

  the given \a id has finished and produced the given \a response.

  \sa processCommand(), notifyEvent()

*/

void QScriptDebuggerFrontend::notifyCommandFinished(int id, const QScriptDebuggerResponse &response)

{

    Q_D(QScriptDebuggerFrontend);

    if (d->responseHandlers.contains(id)) {

        QScriptDebuggerResponseHandlerInterface *handler = d->responseHandlers.take(id);

        Q_ASSERT(handler != 0);

        handler->handleResponse(response, id);

    }

}

/*!

  Subclasses should call this function when the given \a event is

  received from the back-end.

  \sa notifyCommandFinished(), QScriptDebuggerBackend::event()

*/

bool QScriptDebuggerFrontend::notifyEvent(const QScriptDebuggerEvent &event)

{

    Q_D(QScriptDebuggerFrontend);

    if (d->eventHandler)

        return d->eventHandler->debuggerEvent(event);

    return false;

}

int QScriptDebuggerFrontend::scheduledCommandCount() const

{

    Q_D(const QScriptDebuggerFrontend);

    return d->nextCommandId;

}

/*!

  \fn void QScriptDebuggerFrontend::processCommand(int id, const QScriptDebuggerCommand &command)

  Subclasses must reimplement this function to process the given \a command

  identified by \a id. Call notifyCommandFinished() when processing is

  complete.

*/

QT_END_NAMESPACE