/***************************************************************************
 *   This file is part of the Lime Report project                          *
 *   Copyright (C) 2021 by Alexander Arin                                  *
 *   arin_a@bk.ru                                                          *
 *                                                                         *
 **                   GNU General Public License Usage                    **
 *                                                                         *
 *   This library is free software: you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation, either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 *                                                                         *
 **                  GNU Lesser General Public License                    **
 *                                                                         *
 *   This library is free software: you can redistribute it and/or modify  *
 *   it under the terms of the GNU Lesser General Public License as        *
 *   published by the Free Software Foundation, either version 3 of the    *
 *   License, or (at your option) any later version.                       *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library.                                      *
 *   If not, see <http://www.gnu.org/licenses/>.                           *
 *                                                                         *
 *   This library is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 ****************************************************************************/
#include "lrpropertydelegate.h"

#include "lrglobal.h"
#include "lrobjectinspectorwidget.h"
#include "lrobjectitemmodel.h"

#include <QApplication>
#include <QLineEdit>
#include <QPainter>

LimeReport::PropertyDelegate::PropertyDelegate(QObject* parent):
    QStyledItemDelegate(parent),
    m_objectInspector(NULL),
    m_editingItem(0),
    m_isEditing(false)
{
}

void LimeReport::PropertyDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option,
                                         const QModelIndex& index) const
{
    if (!index.isValid())
        return;

#if QT_VERSION >= 0x050000
    QStyleOptionViewItem opt = option;
#else
    QStyleOptionViewItemV4 opt = option;
#endif

    QStyle* style = opt.widget ? opt.widget->style() : QApplication::style();

    LimeReport::ObjectPropItem* node
        = qvariant_cast<LimeReport::ObjectPropItem*>(index.data(Qt::UserRole));
    if (node) {
        if (!node->isHaveValue()) {
            if (index.column() == 0) {
                StyleOptionViewItem cellOpt = option;
                QTreeView const* tree = dynamic_cast<const QTreeView*>(cellOpt.widget);
                QStyleOptionViewItem primitiveOpt = cellOpt;
                primitiveOpt.rect.setWidth(tree->indentation());
                painter->save();
                painter->setPen(option.palette.color(QPalette::HighlightedText));
                painter->setBackground(QBrush(option.palette.color(QPalette::Highlight)));
                cellOpt.widget->style()->drawPrimitive(QStyle::PE_IndicatorBranch, &primitiveOpt,
                                                       painter);
                cellOpt.rect.adjust(primitiveOpt.rect.width(), 0, 0, 0);
                cellOpt.font.setBold(true);
                cellOpt.palette.setColor(QPalette::Text,
                                         cellOpt.palette.color(QPalette::BrightText));
                cellOpt.text = LimeReport::extractClassName(node->propertyName());
                style->drawControl(QStyle::CE_ItemViewItem, &cellOpt, painter, cellOpt.widget);
                painter->restore();
            }
        } else {

            StyleOptionViewItem so = option;
            if ((node->isValueReadonly()) && (!node->isHaveChildren())) {
                so.palette.setColor(QPalette::Text, so.palette.color(QPalette::Dark));
            }

            QColor backgroundColor = (so.features & StyleOptionViewItem::Alternate)
                ? so.palette.alternateBase().color()
                : so.palette.base().color();

            qreal luma = 0.2126 * backgroundColor.red() + 0.7152 * backgroundColor.green()
                + 0.0722 * backgroundColor.blue();

            if (luma < 128)
                so.palette.setColor(QPalette::Text, Qt::white);
            else
                so.palette.setColor(QPalette::Text, Qt::black);

            opt.text = "";
            opt.rect.setHeight(opt.rect.height() - 1);
            style->drawControl(QStyle::CE_ItemViewItem, &opt, painter, opt.widget);

            if (!node->paint(painter, so, index)) {
                so.state &= ~QStyle::State_HasFocus;
                so.rect.adjust(0, 0, 0, -1);
                QStyledItemDelegate::paint(painter, so, index);
            }

            if (index.column() == 0) {
                QPointF start(option.rect.x() + option.rect.width() - 1, option.rect.y());
                QPointF end(option.rect.x() + option.rect.width() - 1,
                            option.rect.y() + option.rect.height());
                painter->save();
                QColor color = static_cast<QRgb>(
                    QApplication::style()->styleHint(QStyle::SH_Table_GridLineColor, &option));
                painter->setPen(color);
                painter->drawLine(start, end);
                painter->restore();
            }
        }
    }
}

QSize LimeReport::PropertyDelegate::sizeHint(const QStyleOptionViewItem& option,
                                             const QModelIndex& index) const
{
    QSize size = option.rect.size();
    size.setHeight(option.fontMetrics.height()
                   + QApplication::style()->pixelMetric(QStyle::PM_ButtonMargin)
#ifdef Q_OS_MAC
                   + QApplication::style()->pixelMetric(QStyle::PM_FocusFrameVMargin)
#endif
                   + 4);
    // return size;
    QSize defaultSize = QStyledItemDelegate::sizeHint(option, index);
    return size.height() > defaultSize.height() ? size : defaultSize;
}

QWidget* LimeReport::PropertyDelegate::createEditor(QWidget* parent,
                                                    const QStyleOptionViewItem& option,
                                                    const QModelIndex& index) const
{
    m_editingItem = qvariant_cast<LimeReport::ObjectPropItem*>(index.data(Qt::UserRole));
    connect(m_editingItem, SIGNAL(destroyed(QObject*)), this, SLOT(slotItemDeleted(QObject*)));
    QWidget* editor = m_editingItem->createProperyEditor(parent);
    if (editor) {
        m_isEditing = true;
        editor->setMaximumHeight(option.rect.height() - 1);
        editor->setGeometry(option.rect);
        if (editor->metaObject()->indexOfSignal("editingFinished()") != -1)
            connect(editor, SIGNAL(editingFinished()), this, SLOT(commitAndCloseEditor()));
        connect(editor, SIGNAL(destroyed()), this, SLOT(slotEditorDeleted()));
    }
    return editor;
}

void LimeReport::PropertyDelegate::setEditorData(QWidget* editor, const QModelIndex& index) const
{
    if (m_editingItem)
        m_editingItem->setPropertyEditorData(editor, index);
}

void LimeReport::PropertyDelegate::commitAndCloseEditor()
{
    QWidget* editor = qobject_cast<QWidget*>(sender());
    emit commitData(editor);
    emit closeEditor(editor);
}

void LimeReport::PropertyDelegate::setModelData(QWidget* editor, QAbstractItemModel* model,
                                                const QModelIndex& index) const
{
    if (m_editingItem)
        m_editingItem->setModelData(editor, model, index);
}

void LimeReport::PropertyDelegate::updateEditorGeometry(QWidget* editor,
                                                        const QStyleOptionViewItem& option,
                                                        const QModelIndex& index) const
{
    if (m_editingItem)
        m_editingItem->updateEditorGeometry(editor, option, index);
}

void LimeReport::PropertyDelegate::setObjectInspector(ObjectInspectorTreeView* objectInspector)
{
    m_objectInspector = objectInspector;
}

void LimeReport::PropertyDelegate::slotEditorDeleted() { m_isEditing = false; }

void LimeReport::PropertyDelegate::slotItemDeleted(QObject* item)
{
    if (item == m_editingItem)
        m_editingItem = 0;
}

LimeReport::ObjectPropItem* LimeReport::PropertyDelegate::editingItem() { return m_editingItem; }