/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
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**************************************************************************/

#include "qmlcppengine.h"
#include "debuggerruncontrolfactory.h"
#include "debuggercore.h"
#include "debuggerstartparameters.h"
#include "stackhandler.h"
#include "qmlengine.h"

#include <coreplugin/icore.h>
#include <utils/qtcassert.h>

#include <QtCore/QTimer>
#include <QtGui/QMainWindow>

namespace Debugger {
namespace Internal {

enum { debug = 0 };

#define EDEBUG(s) do { if (debug) qDebug() << s; } while (0)

const int ConnectionWaitTimeMs = 5000;

QmlEngine *createQmlEngine(const DebuggerStartParameters &,
    DebuggerEngine *masterEngine);

DebuggerEngine *createQmlCppEngine(const DebuggerStartParameters &sp,
                                   DebuggerEngineType slaveEngineType,
                                   QString *errorMessage)
{
    QmlCppEngine *newEngine = new QmlCppEngine(sp, slaveEngineType, errorMessage);
    if (newEngine->cppEngine())
        return newEngine;
    delete newEngine;
    return 0;
}


////////////////////////////////////////////////////////////////////////
//
// QmlCppEnginePrivate
//
////////////////////////////////////////////////////////////////////////

class QmlCppEnginePrivate : public QObject
{
    Q_OBJECT

public:
    QmlCppEnginePrivate(QmlCppEngine *parent,
            const DebuggerStartParameters &sp);
    ~QmlCppEnginePrivate() {}

private slots:
    void cppStackChanged();
    void qmlStackChanged();

private:
    friend class QmlCppEngine;
    QmlCppEngine *q;
    QmlEngine *m_qmlEngine;
    DebuggerEngine *m_cppEngine;
    DebuggerEngine *m_activeEngine;
    int m_stackBoundary;
};


QmlCppEnginePrivate::QmlCppEnginePrivate(QmlCppEngine *parent,
        const DebuggerStartParameters &sp)
    : q(parent), m_qmlEngine(createQmlEngine(sp, q)),
      m_cppEngine(0), m_activeEngine(0)
{
    setObjectName(QLatin1String("QmlCppEnginePrivate"));
}

void QmlCppEnginePrivate::cppStackChanged()
{
    const QLatin1String firstFunction("QScript::FunctionWrapper::proxyCall");
    StackFrames frames;
    foreach (const StackFrame &frame, m_cppEngine->stackHandler()->frames()) {
        if (frame.function.endsWith(firstFunction))
            break;
        frames.append(frame);
    }
    int level = frames.size();
    m_stackBoundary = level;
    foreach (StackFrame frame, m_qmlEngine->stackHandler()->frames()) {
        frame.level = level++;
        frames.append(frame);
    }
    q->stackHandler()->setFrames(frames);
}

void QmlCppEnginePrivate::qmlStackChanged()
{
    StackFrames frames = m_qmlEngine->stackHandler()->frames();
    q->stackHandler()->setFrames(frames);
    m_stackBoundary = 0;
}


////////////////////////////////////////////////////////////////////////
//
// QmlCppEngine
//
////////////////////////////////////////////////////////////////////////

QmlCppEngine::QmlCppEngine(const DebuggerStartParameters &sp,
                           DebuggerEngineType slaveEngineType,
                           QString *errorMessage)
    : DebuggerEngine(sp, DebuggerLanguages(CppLanguage) | QmlLanguage), d(new QmlCppEnginePrivate(this, sp))
{
    setObjectName(QLatin1String("QmlCppEngine"));
    d->m_cppEngine = DebuggerRunControlFactory::createEngine(slaveEngineType, sp, this, errorMessage);
    if (!d->m_cppEngine) {
        *errorMessage = tr("The slave debugging engine required for combined QML/C++-Debugging could not be created: %1").arg(*errorMessage);
        return;
    }
    d->m_activeEngine = d->m_cppEngine;

    connect(d->m_cppEngine->stackHandler(), SIGNAL(stackChanged()),
            d, SLOT(cppStackChanged()), Qt::QueuedConnection);
    connect(d->m_qmlEngine->stackHandler(), SIGNAL(stackChanged()),
            d, SLOT(qmlStackChanged()), Qt::QueuedConnection);
    connect(d->m_cppEngine, SIGNAL(stackFrameCompleted()), this, SIGNAL(stackFrameCompleted()));
    connect(d->m_cppEngine, SIGNAL(requestRemoteSetup()), this, SIGNAL(requestRemoteSetup()));
    connect(d->m_qmlEngine, SIGNAL(stackFrameCompleted()), this, SIGNAL(stackFrameCompleted()));
}

QmlCppEngine::~QmlCppEngine()
{
    delete d->m_qmlEngine;
    delete d->m_cppEngine;
    delete d;
}

bool QmlCppEngine::setToolTipExpression(const QPoint & mousePos,
        TextEditor::ITextEditor *editor, const DebuggerToolTipContext &ctx)
{
    return d->m_activeEngine->setToolTipExpression(mousePos, editor, ctx);
}

void QmlCppEngine::updateWatchData(const WatchData &data,
    const WatchUpdateFlags &flags)
{
    d->m_activeEngine->updateWatchData(data, flags);
}

void QmlCppEngine::watchPoint(const QPoint &point)
{
    d->m_cppEngine->watchPoint(point);
}

void QmlCppEngine::fetchMemory(MemoryAgent *ma, QObject *obj,
        quint64 addr, quint64 length)
{
    d->m_cppEngine->fetchMemory(ma, obj, addr, length);
}

void QmlCppEngine::fetchDisassembler(DisassemblerAgent *da)
{
    d->m_cppEngine->fetchDisassembler(da);
}

void QmlCppEngine::activateFrame(int index)
{
    if (state() != InferiorStopOk && state() != InferiorUnrunnable)
        return;

    if (index >= d->m_stackBoundary)
        d->m_qmlEngine->activateFrame(index - d->m_stackBoundary);
    else
        d->m_cppEngine->activateFrame(index);
    stackHandler()->setCurrentIndex(index);
}

void QmlCppEngine::reloadModules()
{
    d->m_cppEngine->reloadModules();
}

void QmlCppEngine::examineModules()
{
    d->m_cppEngine->examineModules();
}

void QmlCppEngine::loadSymbols(const QString &moduleName)
{
    d->m_cppEngine->loadSymbols(moduleName);
}

void QmlCppEngine::loadAllSymbols()
{
    d->m_cppEngine->loadAllSymbols();
}

void QmlCppEngine::requestModuleSymbols(const QString &moduleName)
{
    d->m_cppEngine->requestModuleSymbols(moduleName);
}

void QmlCppEngine::reloadRegisters()
{
    d->m_cppEngine->reloadRegisters();
}

void QmlCppEngine::reloadSourceFiles()
{
    d->m_cppEngine->reloadSourceFiles();
}

void QmlCppEngine::reloadFullStack()
{
    d->m_cppEngine->reloadFullStack();
}

void QmlCppEngine::setRegisterValue(int regnr, const QString &value)
{
    d->m_cppEngine->setRegisterValue(regnr, value);
}

unsigned QmlCppEngine::debuggerCapabilities() const
{
    // ### this could also be an OR of both engines' capabilities
    unsigned result = d->m_cppEngine->debuggerCapabilities();
    if (d->m_activeEngine != d->m_cppEngine) {
        const unsigned qmlCapabilities = d->m_qmlEngine->debuggerCapabilities();
        if (qmlCapabilities & AddWatcherWhileRunningCapability)
            result |= AddWatcherWhileRunningCapability;
        if (!(qmlCapabilities & WatchWidgetsCapability))
            result &= ~WatchWidgetsCapability;
    }
    return result;
}

bool QmlCppEngine::isSynchronous() const
{
    return d->m_activeEngine->isSynchronous();
}

QByteArray QmlCppEngine::qtNamespace() const
{
    return d->m_cppEngine->qtNamespace();
}

void QmlCppEngine::createSnapshot()
{
    d->m_cppEngine->createSnapshot();
}

void QmlCppEngine::updateAll()
{
    d->m_activeEngine->updateAll();
}

void QmlCppEngine::attemptBreakpointSynchronization()
{
    d->m_cppEngine->attemptBreakpointSynchronization();

    switch (d->m_qmlEngine->state()) {
    case InferiorRunOk:
    case InferiorRunRequested:
    case InferiorStopOk: // fall through
    case InferiorStopRequested:
        d->m_qmlEngine->attemptBreakpointSynchronization();
        break;
    default:
        break;
    }
}

bool QmlCppEngine::acceptsBreakpoint(BreakpointModelId id) const
{
    return d->m_cppEngine->acceptsBreakpoint(id)
        || d->m_qmlEngine->acceptsBreakpoint(id);
}

void QmlCppEngine::selectThread(int index)
{
    d->m_cppEngine->selectThread(index);
}

void QmlCppEngine::assignValueInDebugger(const WatchData *data,
    const QString &expr, const QVariant &value)
{
    d->m_activeEngine->assignValueInDebugger(data, expr, value);
}

void QmlCppEngine::detachDebugger()
{
    d->m_qmlEngine->detachDebugger();
    d->m_cppEngine->detachDebugger();
}

void QmlCppEngine::executeStep()
{
//    TODO: stepping from qml -> cpp requires more thought
//    if (d->m_activeEngine == d->m_qmlEngine) {
//        QTC_CHECK(d->m_cppEngine->state() == InferiorRunOk);
//        if (d->m_cppEngine->setupQmlStep(true))
//            return; // Wait for callback to readyToExecuteQmlStep()
//    } else {
//        notifyInferiorRunRequested();
//        d->m_cppEngine->executeStep();
//    }

    notifyInferiorRunRequested();
    d->m_activeEngine->executeStep();
}

void QmlCppEngine::readyToExecuteQmlStep()
{
    notifyInferiorRunRequested();
    d->m_qmlEngine->executeStep();
}

void QmlCppEngine::executeStepOut()
{
    notifyInferiorRunRequested();
    d->m_activeEngine->executeStepOut();
}

void QmlCppEngine::executeNext()
{
    notifyInferiorRunRequested();
    d->m_activeEngine->executeNext();
}

void QmlCppEngine::executeStepI()
{
    notifyInferiorRunRequested();
    d->m_activeEngine->executeStepI();
}

void QmlCppEngine::executeNextI()
{
    notifyInferiorRunRequested();
    d->m_activeEngine->executeNextI();
}

void QmlCppEngine::executeReturn()
{
    notifyInferiorRunRequested();
    d->m_activeEngine->executeReturn();
}

void QmlCppEngine::continueInferior()
{
    EDEBUG("\nMASTER CONTINUE INFERIOR"
        << d->m_cppEngine->state() << d->m_qmlEngine->state());
    notifyInferiorRunRequested();
    if (d->m_cppEngine->state() == InferiorStopOk) {
        d->m_cppEngine->continueInferior();
    } else if (d->m_qmlEngine->state() == InferiorStopOk) {
        d->m_qmlEngine->continueInferior();
    } else {
        QTC_ASSERT(false, qDebug() << "MASTER CANNOT CONTINUE INFERIOR"
                << d->m_cppEngine->state() << d->m_qmlEngine->state());
        notifyEngineIll();
    }
}

void QmlCppEngine::interruptInferior()
{
    EDEBUG("\nMASTER INTERRUPT INFERIOR");
    d->m_cppEngine->requestInterruptInferior();
}

void QmlCppEngine::requestInterruptInferior()
{
    EDEBUG("\nMASTER REQUEST INTERRUPT INFERIOR");
    DebuggerEngine::requestInterruptInferior();
}

void QmlCppEngine::executeRunToLine(const ContextData &data)
{
    d->m_activeEngine->executeRunToLine(data);
}

void QmlCppEngine::executeRunToFunction(const QString &functionName)
{
    d->m_activeEngine->executeRunToFunction(functionName);
}

void QmlCppEngine::executeJumpToLine(const ContextData &data)
{
    d->m_activeEngine->executeJumpToLine(data);
}

void QmlCppEngine::executeDebuggerCommand(const QString &command)
{
    if (d->m_qmlEngine->state() == InferiorStopOk) {
        d->m_qmlEngine->executeDebuggerCommand(command);
    } else {
        d->m_cppEngine->executeDebuggerCommand(command);
    }
}

/////////////////////////////////////////////////////////

void QmlCppEngine::setupEngine()
{
    EDEBUG("\nMASTER SETUP ENGINE");
    d->m_activeEngine = d->m_cppEngine;
    d->m_stackBoundary = 0;
    d->m_qmlEngine->setupSlaveEngine();
    d->m_cppEngine->setupSlaveEngine();
}

void QmlCppEngine::notifyEngineRunAndInferiorRunOk()
{
    EDEBUG("\nMASTER NOTIFY ENGINE RUN AND INFERIOR RUN OK");
    DebuggerEngine::notifyEngineRunAndInferiorRunOk();
}

void QmlCppEngine::notifyInferiorRunOk()
{
    EDEBUG("\nMASTER NOTIFY INFERIOR RUN OK");
    DebuggerEngine::notifyInferiorRunOk();
}

void QmlCppEngine::notifyInferiorSpontaneousStop()
{
    EDEBUG("\nMASTER SPONTANEOUS STOP OK");
    DebuggerEngine::notifyInferiorSpontaneousStop();
}

void QmlCppEngine::notifyInferiorShutdownOk()
{
    EDEBUG("\nMASTER INFERIOR SHUTDOWN OK");
    DebuggerEngine::notifyInferiorShutdownOk();
}

void QmlCppEngine::setupInferior()
{
    EDEBUG("\nMASTER SETUP INFERIOR");
    d->m_qmlEngine->setupSlaveInferior();
    d->m_cppEngine->setupSlaveInferior();
}

void QmlCppEngine::runEngine()
{
    EDEBUG("\nMASTER RUN ENGINE");
    d->m_qmlEngine->runSlaveEngine();
    d->m_cppEngine->runSlaveEngine();
}

void QmlCppEngine::shutdownInferior()
{
    EDEBUG("\nMASTER SHUTDOWN INFERIOR");
    d->m_cppEngine->quitDebugger();
    d->m_qmlEngine->quitDebugger();
}

void QmlCppEngine::shutdownEngine()
{
    EDEBUG("\nMASTER SHUTDOWN ENGINE");
    d->m_qmlEngine->shutdownSlaveEngine();
    d->m_cppEngine->shutdownSlaveEngine();
}

void QmlCppEngine::setState(DebuggerState newState, bool forced)
{
    EDEBUG("SET MASTER STATE: " << newState);
    EDEBUG("  CPP STATE: " << d->m_cppEngine->state());
    EDEBUG("  QML STATE: " << d->m_qmlEngine->state());
    DebuggerEngine::setState(newState, forced);
}

void QmlCppEngine::slaveEngineStateChanged
    (DebuggerEngine *slaveEngine, const DebuggerState newState)
{
    if (debug) {
        DebuggerEngine *otherEngine = slaveEngine == d->m_cppEngine
             ? d->m_qmlEngine : d->m_cppEngine;

        EDEBUG("GOT SLAVE STATE: " << slaveEngine << newState);
        EDEBUG("  OTHER ENGINE: " << otherEngine << otherEngine->state());
        EDEBUG("  COMBINED ENGINE: " << this << state() << isDying());
    }
    // Idea is to follow the state of the cpp engine,
    // except where we are stepping in QML

    if (slaveEngine == d->m_cppEngine) {
        switch (newState) {
        case DebuggerNotReady:
            // Can this ever happen?
            break;
        case EngineSetupRequested:
            QTC_CHECK(state() == EngineSetupRequested);
            break;

        case EngineSetupFailed:
            qmlEngine()->quitDebugger();
            notifyEngineSetupFailed();
            break;

        case EngineSetupOk:
            notifyEngineSetupOk();
            break;

        case InferiorSetupRequested:
            break;

        case InferiorSetupFailed:
            qmlEngine()->quitDebugger();
            notifyInferiorSetupFailed();
            break;

        case InferiorSetupOk:
            notifyInferiorSetupOk();
            break;

        case EngineRunRequested:
            break;

        case EngineRunFailed:
            qmlEngine()->quitDebugger();
            notifyEngineRunFailed();
            break;

        case InferiorUnrunnable:
            notifyInferiorUnrunnable();
            break;

        case InferiorRunRequested:
            break;

        case InferiorRunOk:
            if (state() == EngineRunRequested)
                notifyEngineRunAndInferiorRunOk();
            else if (state() == InferiorRunRequested)
                notifyInferiorRunOk();
            break;

        case InferiorRunFailed:
            qmlEngine()->quitDebugger();
            notifyInferiorRunFailed();
            break;

        case InferiorStopRequested:
            break;

        case InferiorStopOk:
            if (isDying()) {
                EDEBUG("... CPP ENGINE STOPPED DURING SHUTDOWN ");
                if (state() == InferiorStopRequested)
                    notifyInferiorStopOk();
            } else {
                if (d->m_activeEngine != cppEngine()) {
                    showStatusMessage(tr("C++ debugger activated"));
                    d->m_activeEngine = cppEngine();
                }
                switch (state()) {
                case InferiorStopRequested:
                    EDEBUG("... CPP ENGINE STOPPED EXPECTEDLY");
                    notifyInferiorStopOk();
                    break;
                case EngineRunRequested:
                    EDEBUG("... CPP ENGINE STOPPED ON STARTUP");
                    notifyEngineRunAndInferiorStopOk();
                    break;
                default:
                    QTC_CHECK(state() == InferiorRunOk);
                    EDEBUG("... CPP ENGINE STOPPED SPONTANEOUSLY");
                    notifyInferiorSpontaneousStop();
                    break;
                }
            }
            break;

        case InferiorStopFailed:
            notifyInferiorStopFailed();
            break;

        case InferiorExitOk:
            qmlEngine()->quitDebugger();
            notifyInferiorExited();
            break;

        case InferiorShutdownRequested:
            break;

        case InferiorShutdownFailed:
            notifyInferiorShutdownFailed();
            break;

        case InferiorShutdownOk:
            if (state() == InferiorShutdownRequested)
                notifyInferiorShutdownOk();
            break;

        case EngineShutdownRequested:
            break;

        case EngineShutdownFailed:
            qmlEngine()->quitDebugger();
            notifyEngineShutdownFailed();
            break;

        case EngineShutdownOk: {
            qmlEngine()->quitDebugger();
            notifyEngineShutdownOk();
            break;
        }

        case DebuggerFinished:
            break;
        }
    } else {
        // QML engine state change
        if (newState == InferiorStopOk) {
            if (d->m_activeEngine != qmlEngine()) {
                showStatusMessage(tr("QML debugger activated"));
                d->m_activeEngine = qmlEngine();
            }
            if (state() == InferiorRunOk)
                notifyInferiorSpontaneousStop();
            else
                notifyInferiorStopOk();
        } else if (newState == InferiorRunOk) {
            if (d->m_activeEngine == qmlEngine())
                notifyInferiorRunOk();
        }
    }
}

void QmlCppEngine::handleRemoteSetupDone(int gdbServerPort, int qmlPort)
{
    EDEBUG("MASTER REMOTE SETUP DONE");
    d->m_qmlEngine->startParameters().qmlServerPort = qmlPort;
    d->m_cppEngine->handleRemoteSetupDone(gdbServerPort, qmlPort);
}

void QmlCppEngine::handleRemoteSetupFailed(const QString &message)
{
    EDEBUG("MASTER REMOTE SETUP FAILED");
    d->m_qmlEngine->handleRemoteSetupFailed(message);
    d->m_cppEngine->handleRemoteSetupFailed(message);
}

void QmlCppEngine::showMessage(const QString &msg, int channel, int timeout) const
{
    if (channel == AppOutput || channel == AppError || channel == AppStuff) {
        // message is from CppEngine, allow qml engine to process
        d->m_qmlEngine->filterApplicationMessage(msg, channel);
    }
    DebuggerEngine::showMessage(msg, channel, timeout);
}

void QmlCppEngine::resetLocation()
{
    if (d->m_qmlEngine)
        d->m_qmlEngine->resetLocation();
    if (d->m_cppEngine)
        d->m_cppEngine->resetLocation();

    DebuggerEngine::resetLocation();
}

DebuggerEngine *QmlCppEngine::cppEngine() const
{
    return d->m_cppEngine;
}

DebuggerEngine *QmlCppEngine::qmlEngine() const
{
    return d->m_qmlEngine;
}

} // namespace Internal
} // namespace Debugger

#include "qmlcppengine.moc"
