// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#include "qtgroupboxpropertybrowser.h"

#include <QtCore/QHash>
#include <QtWidgets/QGridLayout>
#include <QtWidgets/QGroupBox>
#include <QtWidgets/QLabel>

QT_BEGIN_NAMESPACE

class QtGroupBoxPropertyBrowserPrivate
{
    QtGroupBoxPropertyBrowser *q_ptr;
    Q_DECLARE_PUBLIC(QtGroupBoxPropertyBrowser)
public:

    void init(QWidget *parent);

    void propertyInserted(QtBrowserItem *index, QtBrowserItem *afterIndex);
    void propertyRemoved(QtBrowserItem *index);
    void propertyChanged(QtBrowserItem *index);
    QWidget *createEditor(QtProperty *property, QWidget *parent) const
        { return q_ptr->createEditor(property, parent); }

    void slotEditorDestroyed();
    void slotUpdate();

    struct WidgetItem
    {
        QWidget *widget{nullptr}; // can be null
        QLabel *label{nullptr};
        QLabel *widgetLabel{nullptr};
        QGroupBox *groupBox{nullptr};
        QGridLayout *layout{nullptr};
        QFrame *line{nullptr};
        WidgetItem *parent{nullptr};
        QList<WidgetItem *> children;
    };
private:
    void updateLater();
    void updateItem(WidgetItem *item);
    void insertRow(QGridLayout *layout, int row) const;
    void removeRow(QGridLayout *layout, int row) const;

    bool hasHeader(WidgetItem *item) const;

    QHash<QtBrowserItem *, WidgetItem *> m_indexToItem;
    QHash<WidgetItem *, QtBrowserItem *> m_itemToIndex;
    QHash<QWidget *, WidgetItem *> m_widgetToItem;
    QGridLayout *m_mainLayout;
    QList<WidgetItem *> m_children;
    QList<WidgetItem *> m_recreateQueue;
};

void QtGroupBoxPropertyBrowserPrivate::init(QWidget *parent)
{
    m_mainLayout = new QGridLayout();
    parent->setLayout(m_mainLayout);
    auto *item = new QSpacerItem(0, 0, QSizePolicy::Fixed, QSizePolicy::Expanding);
    m_mainLayout->addItem(item, 0, 0);
}

void QtGroupBoxPropertyBrowserPrivate::slotEditorDestroyed()
{
    auto *editor = qobject_cast<QWidget *>(q_ptr->sender());
    if (!editor)
        return;
    if (!m_widgetToItem.contains(editor))
        return;
    m_widgetToItem[editor]->widget = nullptr;
    m_widgetToItem.remove(editor);
}

void QtGroupBoxPropertyBrowserPrivate::slotUpdate()
{
    for (WidgetItem *item : std::as_const(m_recreateQueue)) {
        WidgetItem *par = item->parent;
        QWidget *w = nullptr;
        QGridLayout *l = nullptr;
        int oldRow = -1;
        if (!par) {
            w = q_ptr;
            l = m_mainLayout;
            oldRow = m_children.indexOf(item);
        } else {
            w = par->groupBox;
            l = par->layout;
            oldRow = par->children.indexOf(item);
            if (hasHeader(par))
                oldRow += 2;
        }

        if (item->widget) {
            item->widget->setParent(w);
        } else if (item->widgetLabel) {
            item->widgetLabel->setParent(w);
        } else {
            item->widgetLabel = new QLabel(w);
        }
        int span = 1;
        if (item->widget)
            l->addWidget(item->widget, oldRow, 1, 1, 1);
        else if (item->widgetLabel)
            l->addWidget(item->widgetLabel, oldRow, 1, 1, 1);
        else
            span = 2;
        item->label = new QLabel(w);
        item->label->setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));
        l->addWidget(item->label, oldRow, 0, 1, span);

        updateItem(item);
    }
    m_recreateQueue.clear();
}

void QtGroupBoxPropertyBrowserPrivate::updateLater()
{
    QMetaObject::invokeMethod(q_ptr, [this] { slotUpdate(); }, Qt::QueuedConnection);
}

void QtGroupBoxPropertyBrowserPrivate::propertyInserted(QtBrowserItem *index, QtBrowserItem *afterIndex)
{
    WidgetItem *afterItem = m_indexToItem.value(afterIndex);
    WidgetItem *parentItem = m_indexToItem.value(index->parent());

    auto *newItem = new WidgetItem();
    newItem->parent = parentItem;

    QGridLayout *layout = nullptr;
    QWidget *parentWidget = nullptr;
    int row = -1;
    if (!afterItem) {
        row = 0;
        if (parentItem)
            parentItem->children.insert(0, newItem);
        else
            m_children.insert(0, newItem);
    } else {
        if (parentItem) {
            row = parentItem->children.indexOf(afterItem) + 1;
            parentItem->children.insert(row, newItem);
        } else {
            row = m_children.indexOf(afterItem) + 1;
            m_children.insert(row, newItem);
        }
    }
    if (parentItem && hasHeader(parentItem))
        row += 2;

    if (!parentItem) {
        layout = m_mainLayout;
        parentWidget = q_ptr;;
    } else {
        if (!parentItem->groupBox) {
            m_recreateQueue.removeAll(parentItem);
            WidgetItem *par = parentItem->parent;
            QWidget *w = nullptr;
            QGridLayout *l = nullptr;
            int oldRow = -1;
            if (!par) {
                w = q_ptr;
                l = m_mainLayout;
                oldRow = m_children.indexOf(parentItem);
            } else {
                w = par->groupBox;
                l = par->layout;
                oldRow = par->children.indexOf(parentItem);
                if (hasHeader(par))
                    oldRow += 2;
            }
            parentItem->groupBox = new QGroupBox(w);
            parentItem->layout = new QGridLayout();
            parentItem->groupBox->setLayout(parentItem->layout);
            if (parentItem->label) {
                l->removeWidget(parentItem->label);
                delete parentItem->label;
                parentItem->label = nullptr;
            }
            if (parentItem->widget) {
                l->removeWidget(parentItem->widget);
                parentItem->widget->setParent(parentItem->groupBox);
                parentItem->layout->addWidget(parentItem->widget, 0, 0, 1, 2);
                parentItem->line = new QFrame(parentItem->groupBox);
            } else if (parentItem->widgetLabel) {
                l->removeWidget(parentItem->widgetLabel);
                delete parentItem->widgetLabel;
                parentItem->widgetLabel = nullptr;
            }
            if (parentItem->line) {
                parentItem->line->setFrameShape(QFrame::HLine);
                parentItem->line->setFrameShadow(QFrame::Sunken);
                parentItem->layout->addWidget(parentItem->line, 1, 0, 1, 2);
            }
            l->addWidget(parentItem->groupBox, oldRow, 0, 1, 2);
            updateItem(parentItem);
        }
        layout = parentItem->layout;
        parentWidget = parentItem->groupBox;
    }

    newItem->label = new QLabel(parentWidget);
    newItem->label->setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));
    newItem->widget = createEditor(index->property(), parentWidget);
    if (!newItem->widget) {
        newItem->widgetLabel = new QLabel(parentWidget);
    } else {
        QObject::connect(newItem->widget, &QWidget::destroyed,
                         q_ptr, [this] { slotEditorDestroyed(); });
        m_widgetToItem[newItem->widget] = newItem;
    }

    insertRow(layout, row);
    int span = 1;
    if (newItem->widget)
        layout->addWidget(newItem->widget, row, 1);
    else if (newItem->widgetLabel)
        layout->addWidget(newItem->widgetLabel, row, 1);
    else
        span = 2;
    layout->addWidget(newItem->label, row, 0, 1, span);

    m_itemToIndex[newItem] = index;
    m_indexToItem[index] = newItem;

    updateItem(newItem);
}

void QtGroupBoxPropertyBrowserPrivate::propertyRemoved(QtBrowserItem *index)
{
    WidgetItem *item = m_indexToItem.value(index);

    m_indexToItem.remove(index);
    m_itemToIndex.remove(item);

    WidgetItem *parentItem = item->parent;

    int row = -1;

    if (parentItem) {
        row = parentItem->children.indexOf(item);
        parentItem->children.removeAt(row);
        if (hasHeader(parentItem))
            row += 2;
    } else {
        row = m_children.indexOf(item);
        m_children.removeAt(row);
    }

    if (item->widget)
        delete item->widget;
    if (item->label)
        delete item->label;
    if (item->widgetLabel)
        delete item->widgetLabel;
    if (item->groupBox)
        delete item->groupBox;

    if (!parentItem) {
        removeRow(m_mainLayout, row);
    } else if (parentItem->children.size() != 0) {
        removeRow(parentItem->layout, row);
    } else {
        WidgetItem *par = parentItem->parent;
        QGridLayout *l = (par ? par->layout : m_mainLayout);
        if (parentItem->widget) {
            parentItem->widget->hide();
            parentItem->widget->setParent(0);
        } else if (parentItem->widgetLabel) {
            parentItem->widgetLabel->hide();
            parentItem->widgetLabel->setParent(0);
        } else {
            //parentItem->widgetLabel = new QLabel(w);
        }
        l->removeWidget(parentItem->groupBox);
        delete parentItem->groupBox;
        parentItem->groupBox = nullptr;
        parentItem->line = nullptr;
        parentItem->layout = nullptr;
        if (!m_recreateQueue.contains(parentItem))
            m_recreateQueue.append(parentItem);
        updateLater();
    }
    m_recreateQueue.removeAll(item);

    delete item;
}

void QtGroupBoxPropertyBrowserPrivate::insertRow(QGridLayout *layout, int row) const
{
    QHash<QLayoutItem *, QRect> itemToPos;
    int idx = 0;
    while (idx < layout->count()) {
        int r, c, rs, cs;
        layout->getItemPosition(idx, &r, &c, &rs, &cs);
        if (r >= row) {
            itemToPos[layout->takeAt(idx)] = QRect(r + 1, c, rs, cs);
        } else {
            idx++;
        }
    }

    for (auto it = itemToPos.cbegin(), icend = itemToPos.cend(); it != icend; ++it) {
        const QRect r = it.value();
        layout->addItem(it.key(), r.x(), r.y(), r.width(), r.height());
    }
}

void QtGroupBoxPropertyBrowserPrivate::removeRow(QGridLayout *layout, int row) const
{
    QHash<QLayoutItem *, QRect> itemToPos;
    int idx = 0;
    while (idx < layout->count()) {
        int r, c, rs, cs;
        layout->getItemPosition(idx, &r, &c, &rs, &cs);
        if (r > row) {
            itemToPos[layout->takeAt(idx)] = QRect(r - 1, c, rs, cs);
        } else {
            idx++;
        }
    }

    for (auto it = itemToPos.cbegin(), icend = itemToPos.cend(); it != icend; ++it) {
        const QRect r = it.value();
        layout->addItem(it.key(), r.x(), r.y(), r.width(), r.height());
    }
}

bool QtGroupBoxPropertyBrowserPrivate::hasHeader(WidgetItem *item) const
{
    return item->widget;
}

void QtGroupBoxPropertyBrowserPrivate::propertyChanged(QtBrowserItem *index)
{
    WidgetItem *item = m_indexToItem.value(index);

    updateItem(item);
}

void QtGroupBoxPropertyBrowserPrivate::updateItem(WidgetItem *item)
{
    QtProperty *property = m_itemToIndex[item]->property();
    if (item->groupBox) {
        QFont font = item->groupBox->font();
        font.setUnderline(property->isModified());
        item->groupBox->setFont(font);
        item->groupBox->setTitle(property->propertyName());
        item->groupBox->setToolTip(property->descriptionToolTip());
        item->groupBox->setStatusTip(property->statusTip());
        item->groupBox->setWhatsThis(property->whatsThis());
        item->groupBox->setEnabled(property->isEnabled());
    }
    if (item->label) {
        QFont font = item->label->font();
        font.setUnderline(property->isModified());
        item->label->setFont(font);
        item->label->setText(property->propertyName());
        item->label->setToolTip(property->descriptionToolTip());
        item->label->setStatusTip(property->statusTip());
        item->label->setWhatsThis(property->whatsThis());
        item->label->setEnabled(property->isEnabled());
    }
    if (item->widgetLabel) {
        QFont font = item->widgetLabel->font();
        font.setUnderline(false);
        item->widgetLabel->setFont(font);
        item->widgetLabel->setText(property->valueText());
        item->widgetLabel->setEnabled(property->isEnabled());
    }
    if (item->widget) {
        QFont font = item->widget->font();
        font.setUnderline(false);
        item->widget->setFont(font);
        item->widget->setEnabled(property->isEnabled());
        const QString valueToolTip = property->valueToolTip();
        item->widget->setToolTip(valueToolTip.isEmpty() ? property->valueText() : valueToolTip);
    }
    //item->setIcon(1, property->valueIcon());
}



/*!
    \class QtGroupBoxPropertyBrowser
    \internal
    \inmodule QtDesigner
    \since 4.4

    \brief The QtGroupBoxPropertyBrowser class provides a QGroupBox
    based property browser.

    A property browser is a widget that enables the user to edit a
    given set of properties. Each property is represented by a label
    specifying the property's name, and an editing widget (e.g. a line
    edit or a combobox) holding its value. A property can have zero or
    more subproperties.

    QtGroupBoxPropertyBrowser provides group boxes for all nested
    properties, i.e. subproperties are enclosed by a group box with
    the parent property's name as its title. For example:

    \image qtgroupboxpropertybrowser.png

    Use the QtAbstractPropertyBrowser API to add, insert and remove
    properties from an instance of the QtGroupBoxPropertyBrowser
    class. The properties themselves are created and managed by
    implementations of the QtAbstractPropertyManager class.

    \sa QtTreePropertyBrowser, QtAbstractPropertyBrowser
*/

/*!
    Creates a property browser with the given \a parent.
*/
QtGroupBoxPropertyBrowser::QtGroupBoxPropertyBrowser(QWidget *parent)
    : QtAbstractPropertyBrowser(parent), d_ptr(new QtGroupBoxPropertyBrowserPrivate)
{
    d_ptr->q_ptr = this;

    d_ptr->init(this);
}

/*!
    Destroys this property browser.

    Note that the properties that were inserted into this browser are
    \e not destroyed since they may still be used in other
    browsers. The properties are owned by the manager that created
    them.

    \sa QtProperty, QtAbstractPropertyManager
*/
QtGroupBoxPropertyBrowser::~QtGroupBoxPropertyBrowser()
{
    for (auto it = d_ptr->m_itemToIndex.cbegin(), icend = d_ptr->m_itemToIndex.cend(); it != icend; ++it)
        delete it.key();
}

/*!
    \reimp
*/
void QtGroupBoxPropertyBrowser::itemInserted(QtBrowserItem *item, QtBrowserItem *afterItem)
{
    d_ptr->propertyInserted(item, afterItem);
}

/*!
    \reimp
*/
void QtGroupBoxPropertyBrowser::itemRemoved(QtBrowserItem *item)
{
    d_ptr->propertyRemoved(item);
}

/*!
    \reimp
*/
void QtGroupBoxPropertyBrowser::itemChanged(QtBrowserItem *item)
{
    d_ptr->propertyChanged(item);
}

QT_END_NAMESPACE

#include "moc_qtgroupboxpropertybrowser.cpp"
