/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Designer of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "formwindowbase_p.h"
#include "connectionedit_p.h"
#include "qdesigner_command_p.h"
#include "qdesigner_propertysheet_p.h"
#include "qdesigner_propertyeditor_p.h"
#include "qdesigner_menu_p.h"
#include "qdesigner_menubar_p.h"
#include "shared_settings_p.h"
#include "grid_p.h"
#include "deviceprofile_p.h"
#include "qdesigner_utils_p.h"
#include "spacer_widget_p.h"

#include <QtDesigner/abstractformeditor.h>
#include <QtDesigner/container.h>
#include <QtDesigner/qextensionmanager.h>
#include <QtDesigner/taskmenu.h>
#include <QtDesigner/abstractintegration.h>

#include <QtCore/qdebug.h>
#include <QtCore/qlist.h>
#include <QtCore/qset.h>
#include <QtCore/qtimer.h>
#include <QtWidgets/qmenu.h>
#include <QtWidgets/qlistwidget.h>
#include <QtWidgets/qtreewidget.h>
#include <QtWidgets/qtablewidget.h>
#include <QtWidgets/qcombobox.h>
#include <QtWidgets/qtabwidget.h>
#include <QtWidgets/qtoolbox.h>
#include <QtWidgets/qtoolbar.h>
#include <QtWidgets/qstatusbar.h>
#include <QtWidgets/qmenu.h>
#include <QtWidgets/qaction.h>
#include <QtWidgets/qlabel.h>

QT_BEGIN_NAMESPACE

namespace qdesigner_internal {

class FormWindowBasePrivate {
public:
    explicit FormWindowBasePrivate(QDesignerFormEditorInterface *core);

    static Grid m_defaultGrid;

    QDesignerFormWindowInterface::Feature m_feature;
    Grid m_grid;
    bool m_hasFormGrid;
    DesignerPixmapCache *m_pixmapCache;
    DesignerIconCache *m_iconCache;
    QtResourceSet *m_resourceSet;
    QMap<QDesignerPropertySheet *, QMap<int, bool> > m_reloadableResources; // bool is dummy, QMap used as QSet
    QMap<QDesignerPropertySheet *, QObject *> m_reloadablePropertySheets;
    const DeviceProfile m_deviceProfile;
    FormWindowBase::LineTerminatorMode m_lineTerminatorMode;
    FormWindowBase::ResourceFileSaveMode m_saveResourcesBehaviour;
    bool m_useIdBasedTranslations;
    bool m_connectSlotsByName;
};

FormWindowBasePrivate::FormWindowBasePrivate(QDesignerFormEditorInterface *core) :
    m_feature(QDesignerFormWindowInterface::DefaultFeature),
    m_grid(m_defaultGrid),
    m_hasFormGrid(false),
    m_pixmapCache(nullptr),
    m_iconCache(nullptr),
    m_resourceSet(nullptr),
    m_deviceProfile(QDesignerSharedSettings(core).currentDeviceProfile()),
    m_lineTerminatorMode(FormWindowBase::NativeLineTerminator),
    m_saveResourcesBehaviour(FormWindowBase::SaveAllResourceFiles),
    m_useIdBasedTranslations(false),
    m_connectSlotsByName(true)
{
}

Grid FormWindowBasePrivate::m_defaultGrid;

FormWindowBase::FormWindowBase(QDesignerFormEditorInterface *core, QWidget *parent, Qt::WindowFlags flags) :
    QDesignerFormWindowInterface(parent, flags),
    m_d(new FormWindowBasePrivate(core))
{
    syncGridFeature();
    m_d->m_pixmapCache = new DesignerPixmapCache(this);
    m_d->m_iconCache = new DesignerIconCache(m_d->m_pixmapCache, this);
    if (core->integration()->hasFeature(QDesignerIntegrationInterface::DefaultWidgetActionFeature))
        connect(this, &QDesignerFormWindowInterface::activated, this, &FormWindowBase::triggerDefaultAction);
}

FormWindowBase::~FormWindowBase()
{
    QSet<QDesignerPropertySheet *> sheets;
    for (auto it = m_d->m_reloadableResources.cbegin(), end = m_d->m_reloadableResources.cend(); it != end; ++it)
        sheets.insert(it.key());
    for (auto it = m_d->m_reloadablePropertySheets.cbegin(), end = m_d->m_reloadablePropertySheets.cend(); it != end; ++it)
        sheets.insert(it.key());

    m_d->m_reloadableResources.clear();
    m_d->m_reloadablePropertySheets.clear();

    for (QDesignerPropertySheet *sheet : sheets)
        disconnectSheet(sheet);

    delete m_d;
}

DesignerPixmapCache *FormWindowBase::pixmapCache() const
{
    return m_d->m_pixmapCache;
}

DesignerIconCache *FormWindowBase::iconCache() const
{
    return m_d->m_iconCache;
}

QtResourceSet *FormWindowBase::resourceSet() const
{
    return m_d->m_resourceSet;
}

void FormWindowBase::setResourceSet(QtResourceSet *resourceSet)
{
    m_d->m_resourceSet = resourceSet;
}

void FormWindowBase::addReloadableProperty(QDesignerPropertySheet *sheet, int index)
{
    connectSheet(sheet);
    m_d->m_reloadableResources[sheet][index] = true;
}

void FormWindowBase::removeReloadableProperty(QDesignerPropertySheet *sheet, int index)
{
    m_d->m_reloadableResources[sheet].remove(index);
    if (!m_d->m_reloadableResources[sheet].count()) {
        m_d->m_reloadableResources.remove(sheet);
        disconnectSheet(sheet);
    }
}

void FormWindowBase::addReloadablePropertySheet(QDesignerPropertySheet *sheet, QObject *object)
{
    if (qobject_cast<QTreeWidget *>(object) ||
            qobject_cast<QTableWidget *>(object) ||
            qobject_cast<QListWidget *>(object) ||
            qobject_cast<QComboBox *>(object)) {
        connectSheet(sheet);
        m_d->m_reloadablePropertySheets[sheet] = object;
    }
}

void FormWindowBase::connectSheet(QDesignerPropertySheet *sheet)
{
    if (m_d->m_reloadableResources.contains(sheet)
            || m_d->m_reloadablePropertySheets.contains(sheet)) {
        // already connected
        return;
    }
    connect(sheet, &QObject::destroyed, this, &FormWindowBase::sheetDestroyed);
}

void FormWindowBase::disconnectSheet(QDesignerPropertySheet *sheet)
{
    if (m_d->m_reloadableResources.contains(sheet)
            || m_d->m_reloadablePropertySheets.contains(sheet)) {
        // still need to be connected
        return;
    }
    disconnect(sheet, &QObject::destroyed, this, &FormWindowBase::sheetDestroyed);
}

void FormWindowBase::sheetDestroyed(QObject *object)
{
    // qobject_cast<QDesignerPropertySheet *>(object)
    // will fail since the destructor of QDesignerPropertySheet
    // has already finished

    for (auto it = m_d->m_reloadableResources.begin();
         it != m_d->m_reloadableResources.end(); ++it) {
        if (it.key() == object) {
            m_d->m_reloadableResources.erase(it);
            break;
        }
    }

    for (auto it = m_d->m_reloadablePropertySheets.begin();
         it != m_d->m_reloadablePropertySheets.end(); ++it) {
        if (it.key() == object) {
            m_d->m_reloadablePropertySheets.erase(it);
            break;
        }
    }
}

void FormWindowBase::reloadProperties()
{
    pixmapCache()->clear();
    iconCache()->clear();
    for (auto it = m_d->m_reloadableResources.cbegin(), end = m_d->m_reloadableResources.cend(); it != end; ++it) {
        QDesignerPropertySheet *sheet = it.key();
        for (auto jt = it.value().begin(), end = it.value().end(); jt != end; ++jt) {
            const int index = jt.key();
            const QVariant newValue = sheet->property(index);
            if (qobject_cast<QLabel *>(sheet->object()) && sheet->propertyName(index) == QStringLiteral("text")) {
                const PropertySheetStringValue newString = qvariant_cast<PropertySheetStringValue>(newValue);
                // optimize a bit, reset only if the text value might contain a reference to qt resources
                // (however reloading of icons other than taken from resources might not work here)
                if (newString.value().contains(QStringLiteral(":/"))) {
                    const QVariant resetValue = QVariant::fromValue(PropertySheetStringValue());
                    sheet->setProperty(index, resetValue);
                }
            }
            sheet->setProperty(index, newValue);
        }
        if (QTabWidget *tabWidget = qobject_cast<QTabWidget *>(sheet->object())) {
            const int count = tabWidget->count();
            const int current = tabWidget->currentIndex();
            const QString currentTabIcon = QStringLiteral("currentTabIcon");
            for (int i = 0; i < count; i++) {
                tabWidget->setCurrentIndex(i);
                const int index = sheet->indexOf(currentTabIcon);
                sheet->setProperty(index, sheet->property(index));
            }
            tabWidget->setCurrentIndex(current);
        } else if (QToolBox *toolBox = qobject_cast<QToolBox *>(sheet->object())) {
            const int count = toolBox->count();
            const int current = toolBox->currentIndex();
            const QString currentItemIcon = QStringLiteral("currentItemIcon");
            for (int i = 0; i < count; i++) {
                toolBox->setCurrentIndex(i);
                const int index = sheet->indexOf(currentItemIcon);
                sheet->setProperty(index, sheet->property(index));
            }
            toolBox->setCurrentIndex(current);
        }
    }
    for (QObject *object : qAsConst(m_d->m_reloadablePropertySheets)) {
        reloadIconResources(iconCache(), object);
    }
}

void FormWindowBase::resourceSetActivated(QtResourceSet *resource, bool resourceSetChanged)
{
    if (resource == resourceSet() && resourceSetChanged) {
        reloadProperties();
        emit pixmapCache()->reloaded();
        emit iconCache()->reloaded();
        if (QDesignerPropertyEditor *propertyEditor = qobject_cast<QDesignerPropertyEditor *>(core()->propertyEditor()))
            propertyEditor->reloadResourceProperties();
    }
}

QVariantMap FormWindowBase::formData()
{
    QVariantMap rc;
    if (m_d->m_hasFormGrid)
        m_d->m_grid.addToVariantMap(rc, true);
    return rc;
}

void FormWindowBase::setFormData(const QVariantMap &vm)
{
    Grid formGrid;
    m_d->m_hasFormGrid = formGrid.fromVariantMap(vm);
    if (m_d->m_hasFormGrid)
         m_d->m_grid = formGrid;
}

QPoint FormWindowBase::grid() const
{
    return QPoint(m_d->m_grid.deltaX(), m_d->m_grid.deltaY());
}

void FormWindowBase::setGrid(const QPoint &grid)
{
    m_d->m_grid.setDeltaX(grid.x());
    m_d->m_grid.setDeltaY(grid.y());
}

bool FormWindowBase::hasFeature(Feature f) const
{
    return f & m_d->m_feature;
}

static void recursiveUpdate(QWidget *w)
{
    w->update();

    const QObjectList &l = w->children();
    const QObjectList::const_iterator cend = l.constEnd();
    for (QObjectList::const_iterator it = l.constBegin(); it != cend; ++it) {
        if (QWidget *w = qobject_cast<QWidget*>(*it))
            recursiveUpdate(w);
    }
}

void FormWindowBase::setFeatures(Feature f)
{
    m_d->m_feature = f;
    const bool enableGrid = f & GridFeature;
    m_d->m_grid.setVisible(enableGrid);
    m_d->m_grid.setSnapX(enableGrid);
    m_d->m_grid.setSnapY(enableGrid);
    emit featureChanged(f);
    recursiveUpdate(this);
}

FormWindowBase::Feature FormWindowBase::features() const
{
    return m_d->m_feature;
}

bool FormWindowBase::gridVisible() const
{
    return m_d->m_grid.visible() && currentTool() == 0;
}

FormWindowBase::ResourceFileSaveMode FormWindowBase::resourceFileSaveMode() const
{
    return m_d->m_saveResourcesBehaviour;
}

void FormWindowBase::setResourceFileSaveMode(ResourceFileSaveMode behaviour)
{
    m_d->m_saveResourcesBehaviour = behaviour;
}

void FormWindowBase::syncGridFeature()
{
    if (m_d->m_grid.snapX() || m_d->m_grid.snapY())
        m_d->m_feature |= GridFeature;
    else
        m_d->m_feature &= ~GridFeature;
}

void FormWindowBase::setDesignerGrid(const  Grid& grid)
{
    m_d->m_grid = grid;
    syncGridFeature();
    recursiveUpdate(this);
}

const Grid &FormWindowBase::designerGrid() const
{
    return m_d->m_grid;
}

bool FormWindowBase::hasFormGrid() const
{
    return m_d->m_hasFormGrid;
}

void FormWindowBase::setHasFormGrid(bool b)
{
    m_d->m_hasFormGrid = b;
}

void FormWindowBase::setDefaultDesignerGrid(const Grid& grid)
{
    FormWindowBasePrivate::m_defaultGrid = grid;
}

const Grid &FormWindowBase::defaultDesignerGrid()
{
    return FormWindowBasePrivate::m_defaultGrid;
}

QMenu *FormWindowBase::initializePopupMenu(QWidget * /*managedWidget*/)
{
    return nullptr;
}

// Widget under mouse for finding the Widget to highlight
// when doing DnD. Restricts to pages by geometry if a container with
// a container extension (or one of its helper widgets) is hit; otherwise
// returns the widget as such (be it managed/unmanaged)

QWidget *FormWindowBase::widgetUnderMouse(const QPoint &formPos, WidgetUnderMouseMode /* wum */)
{
    // widget_under_mouse might be some temporary thing like the dropLine. We need
    // the actual widget that's part of the edited GUI.
    QWidget *rc = widgetAt(formPos);
    if (!rc || qobject_cast<ConnectionEdit*>(rc))
        return nullptr;

    if (rc == mainContainer()) {
        // Refuse main container areas if the main container has a container extension,
        // for example when hitting QToolBox/QTabWidget empty areas.
        if (qt_extension<QDesignerContainerExtension*>(core()->extensionManager(), rc))
            return nullptr;
        return rc;
    }

    // If we hit on container extension type container, make sure
    // we use the top-most current page
    if (QWidget *container = findContainer(rc, false))
        if (QDesignerContainerExtension *c = qt_extension<QDesignerContainerExtension*>(core()->extensionManager(), container)) {
            // For container that do not have a "stacked" nature (QToolBox, QMdiArea),
            // make sure the position is within the current page
            const int ci = c->currentIndex();
            if (ci < 0)
                return nullptr;
            QWidget *page = c->widget(ci);
            QRect pageGeometry = page->geometry();
            pageGeometry.moveTo(page->mapTo(this, pageGeometry.topLeft()));
            if (!pageGeometry.contains(formPos))
                return nullptr;
            return page;
        }

    return rc;
}

void FormWindowBase::deleteWidgetList(const QWidgetList &widget_list)
{
    // We need a macro here even for single widgets because the some components (for example,
    // the signal slot editor are connected to widgetRemoved() and add their
    // own commands (for example, to delete w's connections)
    const QString description = widget_list.size() == 1 ?
        tr("Delete '%1'").arg(widget_list.constFirst()->objectName()) : tr("Delete");

    commandHistory()->beginMacro(description);
    for (QWidget *w : qAsConst(widget_list)) {
        emit widgetRemoved(w);
        DeleteWidgetCommand *cmd = new DeleteWidgetCommand(this);
        cmd->init(w);
        commandHistory()->push(cmd);
    }
    commandHistory()->endMacro();
}

QMenu *FormWindowBase::createExtensionTaskMenu(QDesignerFormWindowInterface *fw, QObject *o, bool trailingSeparator)
{
    using ActionList = QList<QAction *>;
    ActionList actions;
    // 1) Standard public extension
    QExtensionManager *em = fw->core()->extensionManager();
    if (const QDesignerTaskMenuExtension *extTaskMenu = qt_extension<QDesignerTaskMenuExtension*>(em, o))
        actions += extTaskMenu->taskActions();
    if (const QDesignerTaskMenuExtension *intTaskMenu = qobject_cast<QDesignerTaskMenuExtension *>(em->extension(o, QStringLiteral("QDesignerInternalTaskMenuExtension")))) {
        if (!actions.isEmpty()) {
            QAction *a = new QAction(fw);
            a->setSeparator(true);
            actions.push_back(a);
        }
        actions += intTaskMenu->taskActions();
    }
    if (actions.isEmpty())
        return nullptr;
    if (trailingSeparator && !actions.constLast()->isSeparator()) {
        QAction *a  = new QAction(fw);
        a->setSeparator(true);
        actions.push_back(a);
    }
    QMenu *rc = new QMenu;
    const ActionList::const_iterator cend = actions.constEnd();
    for (ActionList::const_iterator it = actions.constBegin(); it != cend; ++it)
        rc->addAction(*it);
    return rc;
}

void FormWindowBase::emitObjectRemoved(QObject *o)
{
    emit objectRemoved(o);
}

DeviceProfile FormWindowBase::deviceProfile() const
{
    return m_d->m_deviceProfile;
}

QString FormWindowBase::styleName() const
{
    return m_d->m_deviceProfile.isEmpty() ? QString() : m_d->m_deviceProfile.style();
}

void FormWindowBase::emitWidgetRemoved(QWidget *w)
{
    emit widgetRemoved(w);
}

QString FormWindowBase::deviceProfileName() const
{
    return m_d->m_deviceProfile.isEmpty() ? QString() : m_d->m_deviceProfile.name();
}

void FormWindowBase::setLineTerminatorMode(FormWindowBase::LineTerminatorMode mode)
{
    m_d->m_lineTerminatorMode = mode;
}

FormWindowBase::LineTerminatorMode FormWindowBase::lineTerminatorMode() const
{
    return m_d->m_lineTerminatorMode;
}

void FormWindowBase::triggerDefaultAction(QWidget *widget)
{
    if (QAction *action = qdesigner_internal::preferredEditAction(core(), widget))
        QTimer::singleShot(0, action, &QAction::trigger);
}

bool FormWindowBase::useIdBasedTranslations() const
{
    return m_d->m_useIdBasedTranslations;
}

void FormWindowBase::setUseIdBasedTranslations(bool v)
{
    m_d->m_useIdBasedTranslations = v;
}

bool FormWindowBase::connectSlotsByName() const
{
    return m_d->m_connectSlotsByName;
}

void FormWindowBase::setConnectSlotsByName(bool v)
{
    m_d->m_connectSlotsByName = v;
}

QStringList FormWindowBase::checkContents() const
{
    if (!mainContainer())
        return QStringList(tr("Invalid form"));
    // Test for non-laid toplevel spacers, which will not be saved
    // as not to throw off uic.
    QStringList problems;
    const auto &spacers = mainContainer()->findChildren<Spacer *>();
    for (const Spacer *spacer : spacers) {
        if (spacer->parentWidget() && !spacer->parentWidget()->layout()) {
            problems.push_back(tr("<p>This file contains top level spacers.<br/>"
                                  "They will <b>not</b> be saved.</p><p>"
                                  "Perhaps you forgot to create a layout?</p>"));
            break;
        }
    }
    return problems;
}

} // namespace qdesigner_internal

QT_END_NAMESPACE