/****************************************************************************

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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the Qt Designer of the Qt Toolkit.

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** this package.

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** $QT_END_LICENSE$

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****************************************************************************/

#include "signalslotdialog_p.h"

#include "ui_signalslotdialog.h"

#include "metadatabase_p.h"

#include "widgetdatabase_p.h"

#include "qdesigner_formwindowcommand_p.h"

#include "iconloader_p.h"

#include <QtDesigner/QDesignerMemberSheetExtension>

#include <QtDesigner/QExtensionManager>

#include <QtDesigner/QDesignerFormEditorInterface>

#include <QtDesigner/QDesignerFormWindowInterface>

#include <QtDesigner/QDesignerWidgetFactoryInterface>

#include <abstractdialoggui_p.h>

#include <QtGui/QStandardItemModel>

#include <QtGui/QRegExpValidator>

#include <QtGui/QItemDelegate>

#include <QtGui/QLineEdit>

#include <QtGui/QApplication>

#include <QtGui/QMessageBox>

#include <QtCore/QRegExp>

#include <QtCore/QDebug>

QT_BEGIN_NAMESPACE

// Regexp to match a function signature, arguments potentially

// with namespace colons.

static const char *signatureRegExp = "^[\\w+_]+\\(([\\w+:]\\*?,?)*\\)$";

static const char *methodNameRegExp = "^[\\w+_]+$";

static  QStandardItem *createEditableItem(const QString &text)

{

    QStandardItem *rc = new QStandardItem(text);

    rc->setFlags(Qt::ItemIsEnabled|Qt::ItemIsEditable|Qt::ItemIsSelectable);

    return rc;

}

static  QStandardItem *createDisabledItem(const QString &text)

{

    QStandardItem *rc = new QStandardItem(text);

    Qt::ItemFlags flags = rc->flags();

    rc->setFlags(flags & ~(Qt::ItemIsEnabled|Qt::ItemIsEditable|Qt::ItemIsSelectable));

    return rc;

}

static void fakeMethodsFromMetaDataBase(QDesignerFormEditorInterface *core, QObject *o, QStringList &slotList, QStringList &signalList)

{

    slotList.clear();

    signalList.clear();

    if (qdesigner_internal::MetaDataBase *metaDataBase = qobject_cast<qdesigner_internal::MetaDataBase *>(core->metaDataBase()))

        if (const qdesigner_internal::MetaDataBaseItem *item = metaDataBase->metaDataBaseItem(o)) {

            slotList = item->fakeSlots();

            signalList = item->fakeSignals();

        }

}

static void fakeMethodsToMetaDataBase(QDesignerFormEditorInterface *core, QObject *o, const QStringList &slotList, const QStringList &signalList)

{

    if (qdesigner_internal::MetaDataBase *metaDataBase = qobject_cast<qdesigner_internal::MetaDataBase *>(core->metaDataBase())) {

        qdesigner_internal::MetaDataBaseItem *item = metaDataBase->metaDataBaseItem(o);

        Q_ASSERT(item);

        item->setFakeSlots(slotList);

        item->setFakeSignals(signalList);

    }

}

static void existingMethodsFromMemberSheet(QDesignerFormEditorInterface *core,

                                           QObject *o,

                                           QStringList &slotList, QStringList &signalList)

{

    slotList.clear();

    signalList.clear();

    QDesignerMemberSheetExtension *msheet = qt_extension<QDesignerMemberSheetExtension*>(core->extensionManager(), o);

    if (!msheet)

        return;

    for (int i = 0, count = msheet->count(); i < count; ++i)

        if (msheet->isVisible(i)) {

            if (msheet->isSlot(i))

                slotList += msheet->signature(i);

            else

                if (msheet->isSignal(i))

                    signalList += msheet->signature(i);

        }

}

namespace {

    // Internal helper class: A Delegate that validates using RegExps and additionally checks

    // on closing (adds missing parentheses).

    class SignatureDelegate : public QItemDelegate {

    public:

        SignatureDelegate(QObject * parent = 0);

        virtual QWidget * createEditor (QWidget * parent, const QStyleOptionViewItem &option, const QModelIndex &index ) const;

        virtual void setModelData (QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const;

    private:

        const QRegExp m_signatureRegexp;

        const QRegExp m_methodNameRegexp;

    };

    SignatureDelegate::SignatureDelegate(QObject * parent) :

        QItemDelegate(parent),

        m_signatureRegexp(QLatin1String(signatureRegExp)),

        m_methodNameRegexp(QLatin1String(methodNameRegExp))

    {

        Q_ASSERT(m_signatureRegexp.isValid());

        Q_ASSERT(m_methodNameRegexp.isValid());

    }

    QWidget * SignatureDelegate::createEditor ( QWidget * parent, const QStyleOptionViewItem &option, const QModelIndex &index ) const

    {

        QWidget *rc = QItemDelegate::createEditor(parent, option, index);

        QLineEdit *le = qobject_cast<QLineEdit *>(rc);

        Q_ASSERT(le);

        le->setValidator(new QRegExpValidator(m_signatureRegexp, le));

        return rc;

    }

    void SignatureDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index ) const

    {

        QLineEdit *le = qobject_cast<QLineEdit *>(editor);

        Q_ASSERT(le);

        // Did the user just type a name? .. Add parentheses

        QString signature = le->text();

        if (!m_signatureRegexp.exactMatch(signature )) {

            if (m_methodNameRegexp.exactMatch(signature )) {

                signature += QLatin1String("()");

                le->setText(signature);

            } else {

                return;

            }

        }

        QItemDelegate::setModelData(editor, model, index);

    }

    // ------ FakeMethodMetaDBCommand: Undo Command to change fake methods in the meta DB.

    class FakeMethodMetaDBCommand : public qdesigner_internal::QDesignerFormWindowCommand {

    public:

        explicit FakeMethodMetaDBCommand(QDesignerFormWindowInterface *formWindow);

        void init(QObject *o,

                  const QStringList &oldFakeSlots, const QStringList &oldFakeSignals,

                  const QStringList &newFakeSlots, const QStringList &newFakeSignals);

        virtual void undo() { fakeMethodsToMetaDataBase(core(), m_object, m_oldFakeSlots, m_oldFakeSignals); }

        virtual void redo() { fakeMethodsToMetaDataBase(core(), m_object, m_newFakeSlots, m_newFakeSignals); }

    private:

        QObject *m_object;

        QStringList m_oldFakeSlots;

        QStringList m_oldFakeSignals;

        QStringList m_newFakeSlots;

        QStringList m_newFakeSignals;

    };

    FakeMethodMetaDBCommand::FakeMethodMetaDBCommand(QDesignerFormWindowInterface *formWindow) :

        qdesigner_internal::QDesignerFormWindowCommand(QApplication::translate("Command", "Change signals/slots"), formWindow),

        m_object(0)

     {

     }

    void FakeMethodMetaDBCommand::init(QObject *o,

                                       const QStringList &oldFakeSlots, const QStringList &oldFakeSignals,

                                       const QStringList &newFakeSlots, const QStringList &newFakeSignals)

    {

        m_object = o;

        m_oldFakeSlots   = oldFakeSlots;

        m_oldFakeSignals = oldFakeSignals;

        m_newFakeSlots   = newFakeSlots;

        m_newFakeSignals = newFakeSignals;

    }

}

namespace qdesigner_internal {

//  ------ SignalSlotDialogData

void SignalSlotDialogData::clear()

{

    m_existingMethods.clear();

    m_fakeMethods.clear();

}

// ------ SignatureModel

SignatureModel::SignatureModel(QObject *parent) :

     QStandardItemModel(parent)

{

}

bool SignatureModel::setData(const QModelIndex &index, const QVariant &value, int role)

{

    if (role != Qt::EditRole)

        return QStandardItemModel::setData(index, value, role);

    // check via signal (unless it is the same), in which case we can't be bothered.

    const QStandardItem *item = itemFromIndex(index);

    Q_ASSERT(item);

    const QString signature = value.toString();

    if (item->text() == signature)

        return true;

    bool ok = true;

    emit checkSignature(signature, &ok);

    if (!ok)

        return false;

    return QStandardItemModel::setData(index, value, role);

}

// ------ SignaturePanel

SignaturePanel::SignaturePanel(QObject *parent, QListView *listView, QToolButton *addButton, QToolButton *removeButton, const QString &newPrefix) :

    QObject(parent),

    m_newPrefix(newPrefix),

    m_model(new SignatureModel(this)),

    m_listView(listView),

    m_removeButton(removeButton)

{

    m_removeButton->setEnabled(false);

    connect(addButton, SIGNAL(clicked()), this, SLOT(slotAdd()));

    connect(m_removeButton, SIGNAL(clicked()), this, SLOT(slotRemove()));

    m_listView->setModel(m_model);

    SignatureDelegate *delegate = new SignatureDelegate(this);

    m_listView->setItemDelegate(delegate);

    connect(m_model, SIGNAL(checkSignature(QString,bool*)), this, SIGNAL(checkSignature(QString,bool*)));

    connect(m_listView->selectionModel(), SIGNAL(selectionChanged(QItemSelection, QItemSelection)),

            this, SLOT(slotSelectionChanged(QItemSelection, QItemSelection)));

}

void SignaturePanel::slotAdd()

{

    m_listView->selectionModel()->clearSelection();

    // find unique name

    for (int i = 1; ; i++) {

        QString newSlot = m_newPrefix;

        newSlot += QString::number(i); // Always add number, Avoid setting 'slot' for first entry

        newSlot += QLatin1Char('(');

        // check for function name independent of parameters

        if (m_model->findItems(newSlot, Qt::MatchStartsWith, 0).empty()) {

            newSlot += QLatin1Char(')');

            QStandardItem * item = createEditableItem(newSlot);

            m_model->appendRow(item);

            const  QModelIndex index = m_model->indexFromItem (item);

            m_listView->setCurrentIndex (index);

            m_listView->edit(index);

            return;

        }

    }

}

int SignaturePanel::count(const QString &signature) const

{

    return m_model->findItems(signature).size();

}

void SignaturePanel::slotRemove()

{

    const QModelIndexList selectedIndexes = m_listView->selectionModel()->selectedIndexes ();

    if (selectedIndexes.empty())

        return;

    closeEditor();

    // scroll to previous

    if (const int row = selectedIndexes.front().row())

        m_listView->setCurrentIndex (selectedIndexes.front().sibling(row - 1, 0));

    for (int  i = selectedIndexes.size() - 1; i >= 0; i--)

        qDeleteAll(m_model->takeRow(selectedIndexes[i].row()));

}

void SignaturePanel::slotSelectionChanged(const QItemSelection &selected, const QItemSelection &)

{

    m_removeButton->setEnabled(!selected.indexes().empty());

}

void SignaturePanel::setData(const SignalSlotDialogData &d)

{

    m_model->clear();

    QStandardItem *lastExisting = 0;

    foreach(const QString &s, d.m_existingMethods) {

        lastExisting = createDisabledItem(s);

        m_model->appendRow(lastExisting);

    }

    foreach(const QString &s, d.m_fakeMethods)

        m_model->appendRow(createEditableItem(s));

    if (lastExisting)

        m_listView->scrollTo(m_model->indexFromItem(lastExisting));

}

QStringList SignaturePanel::fakeMethods() const

{

    QStringList rc;

    if (const int rowCount = m_model->rowCount())

        for (int  i = 0; i < rowCount; i++) {

            const QStandardItem *item =  m_model->item(i);

            if (item->flags() & Qt::ItemIsEditable)

                rc += item->text();

        }

    return rc;

}

void SignaturePanel::closeEditor()

{

    const QModelIndex idx = m_listView->currentIndex();

    if (idx.isValid())

        m_listView->closePersistentEditor(idx);

}

// ------ SignalSlotDialog

SignalSlotDialog::SignalSlotDialog(QDesignerDialogGuiInterface *dialogGui, QWidget *parent, FocusMode mode) :

    QDialog(parent),

    m_focusMode(mode),

    m_ui(new Ui::SignalSlotDialogClass),

    m_dialogGui(dialogGui)

{

    setModal(true);

    m_ui->setupUi(this);

    const QIcon plusIcon = qdesigner_internal::createIconSet(QString::fromUtf8("plus.png"));

    const QIcon minusIcon = qdesigner_internal::createIconSet(QString::fromUtf8("minus.png"));

    m_ui->addSlotButton->setIcon(plusIcon);

    m_ui->removeSlotButton->setIcon(minusIcon);

    m_ui->addSignalButton->setIcon(plusIcon);

    m_ui->removeSignalButton->setIcon(minusIcon);

    m_slotPanel = new SignaturePanel(this, m_ui->slotListView, m_ui->addSlotButton, m_ui->removeSlotButton, QLatin1String("slot"));

    m_signalPanel = new SignaturePanel(this, m_ui->signalListView, m_ui->addSignalButton, m_ui->removeSignalButton, QLatin1String("signal"));

    connect(m_slotPanel,   SIGNAL(checkSignature(QString,bool*)), this, SLOT(slotCheckSignature(QString,bool*)));

    connect(m_signalPanel, SIGNAL(checkSignature(QString,bool*)), this, SLOT(slotCheckSignature(QString,bool*)));

    connect(m_ui->buttonBox, SIGNAL(accepted()), this, SLOT(accept()));

    connect(m_ui->buttonBox, SIGNAL(rejected()), this, SLOT(reject()));

    switch(m_focusMode) {

    case FocusSlots:

        m_ui->slotListView->setFocus(Qt::OtherFocusReason);

        break;

    case  FocusSignals:

        m_ui->signalListView->setFocus(Qt::OtherFocusReason);

        break;

    }

}

SignalSlotDialog::~SignalSlotDialog()

{

    delete m_ui;

}

void SignalSlotDialog::slotCheckSignature(const QString &signature, bool *ok)

{

    QString errorMessage;

    do {

        if (m_slotPanel->count(signature)) {

            errorMessage = tr("There is already a slot with the signature '%1'.").arg(signature);

            *ok = false;

            break;

        }

        if (m_signalPanel->count(signature)) {

            errorMessage = tr("There is already a signal with the signature '%1'.").arg(signature);

            *ok = false;

            break;

        }

    } while (false);

    if (!*ok)

        m_dialogGui->message(this, QDesignerDialogGuiInterface::SignalSlotDialogMessage,

                             QMessageBox::Warning, tr("%1 - Duplicate Signature").arg(windowTitle()), errorMessage, QMessageBox::Close);

}

QDialog::DialogCode SignalSlotDialog::showDialog(SignalSlotDialogData &slotData, SignalSlotDialogData &signalData)

{

    m_slotPanel->setData(slotData);

    m_signalPanel->setData(signalData);

    const DialogCode rc = static_cast<DialogCode>(exec());

    if (rc == Rejected)

        return rc;

    slotData.m_fakeMethods   = m_slotPanel->fakeMethods();

    signalData.m_fakeMethods = m_signalPanel->fakeMethods();

    return rc;

}

bool SignalSlotDialog::editMetaDataBase(QDesignerFormWindowInterface *fw, QObject *object, QWidget *parent, FocusMode mode)

{

    QDesignerFormEditorInterface *core = fw->core();

    SignalSlotDialog dlg(core->dialogGui(), parent, mode);

    dlg.setWindowTitle(tr("Signals/Slots of %1").arg(object->objectName()));

    SignalSlotDialogData slotData;

    SignalSlotDialogData signalData;

    existingMethodsFromMemberSheet(core, object, slotData.m_existingMethods, signalData.m_existingMethods);

    fakeMethodsFromMetaDataBase(core, object, slotData.m_fakeMethods, signalData.m_fakeMethods);

    const QStringList oldSlots =  slotData.m_fakeMethods;

    const QStringList oldSignals = signalData.m_fakeMethods;

    if (dlg.showDialog(slotData, signalData) == QDialog::Rejected)

        return false;

    if (oldSlots == slotData.m_fakeMethods && oldSignals == signalData.m_fakeMethods)

        return false;

    FakeMethodMetaDBCommand *cmd = new FakeMethodMetaDBCommand(fw);

    cmd->init(object, oldSlots, oldSignals, slotData.m_fakeMethods, signalData.m_fakeMethods);

    fw->commandHistory()->push(cmd);

    return true;

}

bool SignalSlotDialog::editPromotedClass(QDesignerFormEditorInterface *core, const QString &promotedClassName, QWidget *parent, FocusMode mode)

{

    const int index = core->widgetDataBase()->indexOfClassName(promotedClassName);

    if (index == -1)

        return false;

    const QString baseClassName = core->widgetDataBase()->item(index)->extends();

    if (baseClassName.isEmpty())

        return false;

    QWidget *widget = core->widgetFactory()->createWidget(baseClassName, 0);

    if (!widget)

        return false;

    const bool rc = editPromotedClass(core, promotedClassName, widget, parent, mode);

    widget->deleteLater();

    return rc;

}

bool SignalSlotDialog::editPromotedClass(QDesignerFormEditorInterface *core, QObject *baseObject, QWidget *parent, FocusMode mode)

{

    if (!baseObject->isWidgetType())

        return false;

    const QString promotedClassName = promotedCustomClassName(core, qobject_cast<QWidget*>(baseObject));

    if (promotedClassName.isEmpty())

        return false;

    return  editPromotedClass(core, promotedClassName, baseObject, parent, mode);

}

bool SignalSlotDialog::editPromotedClass(QDesignerFormEditorInterface *core, const QString &promotedClassName, QObject *object, QWidget *parent, FocusMode mode)

{

    WidgetDataBase *db = qobject_cast<WidgetDataBase *>(core->widgetDataBase());

    if (!db)

        return false;

    const int index = core->widgetDataBase()->indexOfClassName(promotedClassName);

    if (index == -1)

        return false;

    WidgetDataBaseItem* item = static_cast<WidgetDataBaseItem*>(db->item(index));

    SignalSlotDialogData slotData;

    SignalSlotDialogData signalData;

    existingMethodsFromMemberSheet(core, object, slotData.m_existingMethods, signalData.m_existingMethods);

    slotData.m_fakeMethods = item->fakeSlots();

    signalData.m_fakeMethods = item->fakeSignals();

    const QStringList oldSlots =  slotData.m_fakeMethods;

    const QStringList oldSignals = signalData.m_fakeMethods;

    SignalSlotDialog dlg(core->dialogGui(), parent, mode);

    dlg.setWindowTitle(tr("Signals/Slots of %1").arg(promotedClassName));

    if (dlg.showDialog(slotData, signalData) == QDialog::Rejected)

        return false;

    if (oldSlots == slotData.m_fakeMethods && oldSignals == signalData.m_fakeMethods)

        return false;

    item->setFakeSlots(slotData.m_fakeMethods);

    item->setFakeSignals(signalData.m_fakeMethods);

    return true;

}

}

QT_END_NAMESPACE