/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the tools applications of the Qt Toolkit.
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** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
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** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
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****************************************************************************/

#include "qdbusviewer.h"
#include "qdbusmodel.h"
#include "propertydialog.h"

#include <QtXml/QtXml>

#include <QtWidgets/QTreeWidget>
#include <QtWidgets/QStringListModel>
#include <QtWidgets/QSortFilterProxyModel>
#include <QtWidgets/QLineEdit>
#include <QtWidgets/QListView>
#include <QtWidgets/QTextBrowser>
#include <QtWidgets/QAction>
#include <QtWidgets/QShortcut>
#include <QtWidgets/QVBoxLayout>
#include <QtWidgets/QSplitter>
#include <QtWidgets/QInputDialog>
#include <QtWidgets/QMessageBox>
#include <QtWidgets/QMenu>

#include <private/qdbusutil_p.h>

class QDBusViewModel: public QDBusModel
{
public:
    inline QDBusViewModel(const QString &service, const QDBusConnection &connection)
        : QDBusModel(service, connection)
    {}

    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const
    {
        if (role == Qt::FontRole && itemType(index) == InterfaceItem) {
            QFont f;
            f.setItalic(true);
            return f;
        }
        return QDBusModel::data(index, role);
    }
};

QDBusViewer::QDBusViewer(const QDBusConnection &connection, QWidget *parent)  :
    QWidget(parent),
    c(connection),
    objectPathRegExp(QLatin1String("\\[ObjectPath: (.*)\\]"))
{
    servicesModel = new QStringListModel(this);
    servicesFilterModel = new QSortFilterProxyModel(this);
    servicesFilterModel->setSourceModel(servicesModel);
    servicesFilterModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
    serviceFilterLine = new QLineEdit(this);
    serviceFilterLine->setPlaceholderText(tr("Search..."));
    servicesView = new QListView(this);
    servicesView->setModel(servicesFilterModel);

    connect(serviceFilterLine, SIGNAL(textChanged(QString)), servicesFilterModel, SLOT(setFilterFixedString(QString)));

    tree = new QTreeView;
    tree->setContextMenuPolicy(Qt::CustomContextMenu);

    connect(tree, SIGNAL(activated(QModelIndex)), this, SLOT(activate(QModelIndex)));

    refreshAction = new QAction(tr("&Refresh"), tree);
    refreshAction->setData(42); // increase the amount of 42 used as magic number by one
    refreshAction->setShortcut(QKeySequence::Refresh);
    connect(refreshAction, SIGNAL(triggered()), this, SLOT(refreshChildren()));

    QShortcut *refreshShortcut = new QShortcut(QKeySequence::Refresh, tree);
    connect(refreshShortcut, SIGNAL(activated()), this, SLOT(refreshChildren()));

    QVBoxLayout *layout = new QVBoxLayout(this);
    QSplitter *topSplitter = new QSplitter(Qt::Vertical, this);
    layout->addWidget(topSplitter);

    log = new QTextBrowser;
    connect(log, SIGNAL(anchorClicked(QUrl)), this, SLOT(anchorClicked(QUrl)));

    QSplitter *splitter = new QSplitter(topSplitter);
    splitter->addWidget(servicesView);

    QWidget *servicesWidget = new QWidget;
    QVBoxLayout *servicesLayout = new QVBoxLayout(servicesWidget);
    servicesLayout->addWidget(serviceFilterLine);
    servicesLayout->addWidget(servicesView);
    splitter->addWidget(servicesWidget);
    splitter->addWidget(tree);

    topSplitter->addWidget(splitter);
    topSplitter->addWidget(log);

    connect(servicesView->selectionModel(), SIGNAL(currentChanged(QModelIndex,QModelIndex)),
            this, SLOT(serviceChanged(QModelIndex)));
    connect(tree, SIGNAL(customContextMenuRequested(QPoint)),
            this, SLOT(showContextMenu(QPoint)));

    QMetaObject::invokeMethod(this, "refresh", Qt::QueuedConnection);

    if (c.isConnected()) {
        logMessage(QLatin1String("Connected to D-Bus."));
        QDBusConnectionInterface *iface = c.interface();
        connect(iface, SIGNAL(serviceRegistered(QString)),
                this, SLOT(serviceRegistered(QString)));
        connect(iface, SIGNAL(serviceUnregistered(QString)),
                this, SLOT(serviceUnregistered(QString)));
        connect(iface, SIGNAL(serviceOwnerChanged(QString,QString,QString)),
                this, SLOT(serviceOwnerChanged(QString,QString,QString)));
    } else {
        logError(QLatin1String("Cannot connect to D-Bus: ") + c.lastError().message());
    }

    objectPathRegExp.setMinimal(true);

}

void QDBusViewer::logMessage(const QString &msg)
{
    log->append(msg + QLatin1Char('\n'));
}

void QDBusViewer::logError(const QString &msg)
{
    log->append(QLatin1String("<font color=\"red\">Error: </font>") + Qt::escape(msg) + QLatin1String("<br>"));
}

void QDBusViewer::refresh()
{
    servicesModel->removeRows(0, servicesModel->rowCount());

    if (c.isConnected()) {
        const QStringList serviceNames = c.interface()->registeredServiceNames();
        servicesModel->setStringList(serviceNames);
    }
}

void QDBusViewer::activate(const QModelIndex &item)
{
    if (!item.isValid())
        return;

    const QDBusModel *model = static_cast<const QDBusModel *>(item.model());

    BusSignature sig;
    sig.mService = currentService;
    sig.mPath = model->dBusPath(item);
    sig.mInterface = model->dBusInterface(item);
    sig.mName = model->dBusMethodName(item);
    sig.mTypeSig = model->dBusTypeSignature(item);

    switch (model->itemType(item)) {
    case QDBusModel::SignalItem:
        connectionRequested(sig);
        break;
    case QDBusModel::MethodItem:
        callMethod(sig);
        break;
    case QDBusModel::PropertyItem:
        getProperty(sig);
        break;
    default:
        break;
    }
}

void QDBusViewer::getProperty(const BusSignature &sig)
{
    QDBusMessage message = QDBusMessage::createMethodCall(sig.mService, sig.mPath, QLatin1String("org.freedesktop.DBus.Properties"), QLatin1String("Get"));
    QList<QVariant> arguments;
    arguments << sig.mInterface << sig.mName;
    message.setArguments(arguments);
    c.callWithCallback(message, this, SLOT(dumpMessage(QDBusMessage)));
}

void QDBusViewer::setProperty(const BusSignature &sig)
{
    QDBusInterface iface(sig.mService, sig.mPath, sig.mInterface, c);
    QMetaProperty prop = iface.metaObject()->property(iface.metaObject()->indexOfProperty(sig.mName.toLatin1()));

    bool ok;
    QString input = QInputDialog::getText(this, tr("Arguments"),
                    tr("Please enter the value of the property %1 (type %2)").arg(
                        sig.mName, QString::fromLatin1(prop.typeName())),
                    QLineEdit::Normal, QString(), &ok);
    if (!ok)
        return;

    QVariant value = input;
    if (!value.convert(prop.type())) {
        QMessageBox::warning(this, tr("Unable to marshall"),
                tr("Value conversion failed, unable to set property"));
        return;
    }

    QDBusMessage message = QDBusMessage::createMethodCall(sig.mService, sig.mPath, QLatin1String("org.freedesktop.DBus.Properties"), QLatin1String("Set"));
    QList<QVariant> arguments;
    arguments << sig.mInterface << sig.mName << QVariant::fromValue(QDBusVariant(value));
    message.setArguments(arguments);
    c.callWithCallback(message, this, SLOT(dumpMessage(QDBusMessage)));

}

static QString getDbusSignature(const QMetaMethod& method)
{
    // create a D-Bus type signature from QMetaMethod's parameters
    QString sig;
    for (int i = 0; i < method.parameterTypes().count(); ++i) {
        QVariant::Type type = QVariant::nameToType(method.parameterTypes().at(i));
        sig.append(QString::fromLatin1(QDBusMetaType::typeToSignature(type)));
    }
    return sig;
}

void QDBusViewer::callMethod(const BusSignature &sig)
{
    QDBusInterface iface(sig.mService, sig.mPath, sig.mInterface, c);
    const QMetaObject *mo = iface.metaObject();

    // find the method
    QMetaMethod method;
    for (int i = 0; i < mo->methodCount(); ++i) {
        const QString signature = QString::fromLatin1(mo->method(i).signature());
        if (signature.startsWith(sig.mName) && signature.at(sig.mName.length()) == QLatin1Char('('))
            if (getDbusSignature(mo->method(i)) == sig.mTypeSig)
                method = mo->method(i);
    }
    if (!method.signature()) {
        QMessageBox::warning(this, tr("Unable to find method"),
                tr("Unable to find method %1 on path %2 in interface %3").arg(
                    sig.mName).arg(sig.mPath).arg(sig.mInterface));
        return;
    }

    PropertyDialog dialog;
    QList<QVariant> args;

    const QList<QByteArray> paramTypes = method.parameterTypes();
    const QList<QByteArray> paramNames = method.parameterNames();
    QList<int> types; // remember the low-level D-Bus type
    for (int i = 0; i < paramTypes.count(); ++i) {
        const QByteArray paramType = paramTypes.at(i);
        if (paramType.endsWith('&'))
            continue; // ignore OUT parameters

        QVariant::Type type = QVariant::nameToType(paramType);
        dialog.addProperty(QString::fromLatin1(paramNames.value(i)), type);
        types.append(QMetaType::type(paramType));
    }

    if (!types.isEmpty()) {
        dialog.setInfo(tr("Please enter parameters for the method \"%1\"").arg(sig.mName));

        if (dialog.exec() != QDialog::Accepted)
            return;

        args = dialog.values();
    }

    // Special case - convert a value to a QDBusVariant if the
    // interface wants a variant
    for (int i = 0; i < args.count(); ++i) {
        if (types.at(i) == qMetaTypeId<QDBusVariant>())
            args[i] = QVariant::fromValue(QDBusVariant(args.at(i)));
    }

    QDBusMessage message = QDBusMessage::createMethodCall(sig.mService, sig.mPath, sig.mInterface,
            sig.mName);
    message.setArguments(args);
    c.callWithCallback(message, this, SLOT(dumpMessage(QDBusMessage)));
}

void QDBusViewer::showContextMenu(const QPoint &point)
{
    QModelIndex item = tree->indexAt(point);
    if (!item.isValid())
        return;

    const QDBusModel *model = static_cast<const QDBusModel *>(item.model());

    BusSignature sig;
    sig.mService = currentService;
    sig.mPath = model->dBusPath(item);
    sig.mInterface = model->dBusInterface(item);
    sig.mName = model->dBusMethodName(item);
    sig.mTypeSig = model->dBusTypeSignature(item);

    QMenu menu;
    menu.addAction(refreshAction);

    switch (model->itemType(item)) {
    case QDBusModel::SignalItem: {
        QAction *action = new QAction(tr("&Connect"), &menu);
        action->setData(1);
        menu.addAction(action);
        break; }
    case QDBusModel::MethodItem: {
        QAction *action = new QAction(tr("&Call"), &menu);
        action->setData(2);
        menu.addAction(action);
        break; }
    case QDBusModel::PropertyItem: {
        QAction *actionSet = new QAction(tr("&Set value"), &menu);
        actionSet->setData(3);
        QAction *actionGet = new QAction(tr("&Get value"), &menu);
        actionGet->setData(4);
        menu.addAction(actionSet);
        menu.addAction(actionGet);
        break; }
    default:
        break;
    }

    QAction *selectedAction = menu.exec(tree->viewport()->mapToGlobal(point));
    if (!selectedAction)
        return;

    switch (selectedAction->data().toInt()) {
    case 1:
        connectionRequested(sig);
        break;
    case 2:
        callMethod(sig);
        break;
    case 3:
        setProperty(sig);
        break;
    case 4:
        getProperty(sig);
        break;
    }
}

void QDBusViewer::connectionRequested(const BusSignature &sig)
{
    if (!c.connect(sig.mService, QString(), sig.mInterface, sig.mName, this,
              SLOT(dumpMessage(QDBusMessage)))) {
        logError(tr("Unable to connect to service %1, path %2, interface %3, signal %4").arg(
                    sig.mService).arg(sig.mPath).arg(sig.mInterface).arg(sig.mName));
    }
}

void QDBusViewer::dumpMessage(const QDBusMessage &message)
{
    QList<QVariant> args = message.arguments();
    QString out = QLatin1String("Received ");

    switch (message.type()) {
    case QDBusMessage::SignalMessage:
        out += QLatin1String("signal ");
        break;
    case QDBusMessage::ErrorMessage:
        out += QLatin1String("error message ");
        break;
    case QDBusMessage::ReplyMessage:
        out += QLatin1String("reply ");
        break;
    default:
        out += QLatin1String("message ");
        break;
    }

    out += QLatin1String("from ");
    out += message.service();
    if (!message.path().isEmpty())
        out += QLatin1String(", path ") + message.path();
    if (!message.interface().isEmpty())
        out += QLatin1String(", interface <i>") + message.interface() + QLatin1String("</i>");
    if (!message.member().isEmpty())
        out += QLatin1String(", member ") + message.member();
    out += QLatin1String("<br>");
    if (args.isEmpty()) {
        out += QLatin1String("&nbsp;&nbsp;(no arguments)");
    } else {
        out += QLatin1String("&nbsp;&nbsp;Arguments: ");
        foreach (QVariant arg, args) {
            QString str = Qt::escape(QDBusUtil::argumentToString(arg));
            // turn object paths into clickable links
            str.replace(objectPathRegExp, QLatin1String("[ObjectPath: <a href=\"qdbus://bus\\1\">\\1</a>]"));
            out += str;
            out += QLatin1String(", ");
        }
        out.chop(2);
    }

    log->append(out);
}

void QDBusViewer::serviceChanged(const QModelIndex &index)
{
    delete tree->model();

    currentService.clear();
    if (!index.isValid())
        return;
    currentService = index.data().toString();

    tree->setModel(new QDBusViewModel(currentService, c));
    connect(tree->model(), SIGNAL(busError(QString)), this, SLOT(logError(QString)));
}

void QDBusViewer::serviceRegistered(const QString &service)
{
    if (service == c.baseService())
        return;

    servicesModel->insertRows(0, 1);
    servicesModel->setData(servicesModel->index(0, 0), service);
}

static QModelIndex findItem(QStringListModel *servicesModel, const QString &name)
{
    QModelIndexList hits = servicesModel->match(servicesModel->index(0, 0), Qt::DisplayRole, name);
    if (hits.isEmpty())
        return QModelIndex();

    return hits.first();
}

void QDBusViewer::serviceUnregistered(const QString &name)
{
    QModelIndex hit = findItem(servicesModel, name);
    if (!hit.isValid())
        return;
    servicesModel->removeRows(hit.row(), 1);
}

void QDBusViewer::serviceOwnerChanged(const QString &name, const QString &oldOwner,
                                      const QString &newOwner)
{
    QModelIndex hit = findItem(servicesModel, name);

    if (!hit.isValid() && oldOwner.isEmpty() && !newOwner.isEmpty())
        serviceRegistered(name);
    else if (hit.isValid() && !oldOwner.isEmpty() && newOwner.isEmpty())
        servicesModel->removeRows(hit.row(), 1);
    else if (hit.isValid() && !oldOwner.isEmpty() && !newOwner.isEmpty()) {
        servicesModel->removeRows(hit.row(), 1);
        serviceRegistered(name);
    }
}

void QDBusViewer::refreshChildren()
{
    QDBusModel *model = qobject_cast<QDBusModel *>(tree->model());
    if (!model)
        return;
    model->refresh(tree->currentIndex());
}

void QDBusViewer::about()
{
    QMessageBox box(this);

    box.setText(QString::fromLatin1("<center><img src=\":/trolltech/qdbusviewer/images/qdbusviewer-128.png\">"
                "<h3>%1</h3>"
                "<p>Version %2</p></center>"
                "<p>Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).</p>")
            .arg(tr("D-Bus Viewer")).arg(QLatin1String(QT_VERSION_STR)));
    box.setWindowTitle(tr("D-Bus Viewer"));
    box.exec();
}

void QDBusViewer::anchorClicked(const QUrl &url)
{
    if (url.scheme() != QLatin1String("qdbus"))
        // not ours
        return;

    // swallow the click without setting a new document
    log->setSource(QUrl());

    QDBusModel *model = qobject_cast<QDBusModel *>(tree->model());
    if (!model)
        return;

    QModelIndex idx = model->findObject(QDBusObjectPath(url.path()));
    if (!idx.isValid())
        return;

    tree->scrollTo(idx);
    tree->setCurrentIndex(idx);
}

/*!
  \page qdbusviewer.html
  \title D-Bus Viewer
  \keyword qdbusviewer

  The Qt D-Bus Viewer is a tool that lets you introspect D-Bus objects and messages. You can
  choose between the system bus and the session bus. Click on any service on the list
  on the left side to see all the exported objects.

  You can invoke methods by double-clicking on them. If a method takes one or more IN parameters,
  a property editor opens.

  Right-click on a signal to connect to it. All emitted signals including their parameters
  are output in the message view on the lower side of the window.
*/