/****************************************************************************
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** This file is part of the Qt QML Debugger of the Qt Toolkit.
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** contained in the Technology Preview License Agreement accompanying
** this package.
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** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
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****************************************************************************/
#include <QtCore/qdebug.h>

#include <QtGui/qtreewidget.h>
#include <QtGui/qlayout.h>
#include <QtGui/qheaderview.h>

#include <private/qmldebugservice_p.h>
#include <private/qmldebug_p.h>
#include <private/qmldebugclient_p.h>

#include "objectpropertiesview.h"

QT_BEGIN_NAMESPACE

class PropertiesViewItem : public QObject, public QTreeWidgetItem
{
    Q_OBJECT
public:
    enum Type {
        BindingType,
        OtherType
    };
    
    PropertiesViewItem(QTreeWidget *widget, Type type = OtherType);
    PropertiesViewItem(QTreeWidgetItem *parent, Type type = OtherType);

    QmlDebugPropertyReference property;
    Type type;
};

PropertiesViewItem::PropertiesViewItem(QTreeWidget *widget, Type type)
    : QTreeWidgetItem(widget), type(type)
{
}

PropertiesViewItem::PropertiesViewItem(QTreeWidgetItem *parent, Type type)
    : QTreeWidgetItem(parent), type(type)
{
}

ObjectPropertiesView::ObjectPropertiesView(QmlEngineDebug *client, QWidget *parent)
    : QWidget(parent),
      m_client(client),
      m_query(0),
      m_watch(0)
{
    QVBoxLayout *layout = new QVBoxLayout;
    layout->setContentsMargins(0, 0, 0, 0);
    layout->setSpacing(0);
    setLayout(layout);

    m_tree = new QTreeWidget(this);
    m_tree->setAlternatingRowColors(true);
    m_tree->setExpandsOnDoubleClick(false);
    m_tree->setHeaderLabels(QStringList()
            << tr("Name") << tr("Value") << tr("Type"));
    QObject::connect(m_tree, SIGNAL(itemActivated(QTreeWidgetItem *, int)),
                     this, SLOT(itemActivated(QTreeWidgetItem *)));

    m_tree->setColumnCount(3);
    m_tree->header()->setDefaultSectionSize(150);

    layout->addWidget(m_tree);
}

void ObjectPropertiesView::setEngineDebug(QmlEngineDebug *client)
{
    m_client = client;
}

void ObjectPropertiesView::clear()
{
    setObject(QmlDebugObjectReference());
}

void ObjectPropertiesView::reload(const QmlDebugObjectReference &obj)
{
    if (!m_client)
        return;
    if (m_query)
        delete m_query;

    m_query = m_client->queryObjectRecursive(obj, this);
    if (!m_query->isWaiting())
        queryFinished();
    else
        QObject::connect(m_query, SIGNAL(stateChanged(QmlDebugQuery::State)),
                         this, SLOT(queryFinished()));
}

void ObjectPropertiesView::queryFinished()
{
    if (!m_client || !m_query)
        return;

    QmlDebugObjectReference obj = m_query->object();

    QmlDebugWatch *watch = m_client->addWatch(obj, this);
    if (watch->state() == QmlDebugWatch::Dead) {
        delete watch;
        watch = 0;
    } else {
        if (m_watch) {
            m_client->removeWatch(m_watch);
            delete m_watch;
        }
        m_watch = watch;
        QObject::connect(watch, SIGNAL(valueChanged(QByteArray,QVariant)),
                        this, SLOT(valueChanged(QByteArray,QVariant)));
    }

    delete m_query;
    m_query = 0;

    setObject(obj);
}

void ObjectPropertiesView::setPropertyValue(PropertiesViewItem *item, const QVariant &value, bool makeGray)
{
    if (value.type() == QVariant::List || value.type() == QVariant::StringList) {
        PropertiesViewItem *bindingItem = static_cast<PropertiesViewItem*>(item->takeChild(item->childCount() - 1));
        if (bindingItem && bindingItem->type != PropertiesViewItem::BindingType) {
            delete bindingItem;
            bindingItem = 0;
        }    
            
        qDeleteAll(item->takeChildren());
        
        QVariantList variants = value.toList();
        item->setText(1, tr("<%1 items>", "%1 = number of items").arg(variants.count()));
        item->setText(2, QString::fromUtf8(value.typeName()));
        
        PropertiesViewItem *child;
        for (int i=0; i<variants.count(); i++) {
            child = new PropertiesViewItem(item);
            setPropertyValue(child, variants[i], makeGray);
        }
        
        if (bindingItem)
            item->addChild(bindingItem);

        item->setExpanded(false);
    } else {
        item->setText(1, (value.isNull() ? QLatin1String("<no value>") : value.toString()));
        item->setExpanded(true);
    }
    
    if (makeGray) {
        for (int i=0; i<m_tree->columnCount(); i++)
            item->setForeground(i, Qt::gray);
    }    
}

void ObjectPropertiesView::setObject(const QmlDebugObjectReference &object)
{
    m_object = object;
    m_tree->clear();

    QList<QmlDebugPropertyReference> properties = object.properties();
    for (int i=0; i<properties.count(); i++) {
        const QmlDebugPropertyReference &p = properties[i];

        PropertiesViewItem *item = new PropertiesViewItem(m_tree);
        item->property = p;

        item->setText(0, p.name());
        item->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled);
        
        setPropertyValue(item, p.value(), !p.hasNotifySignal());
        item->setText(2, p.valueTypeName());

        // binding is set after property value to ensure it is added to the end of the
        // list, if the value is a list
        if (!p.binding().isEmpty()) {
            PropertiesViewItem *binding = new PropertiesViewItem(item, PropertiesViewItem::BindingType);
            binding->setText(1, p.binding());
            binding->setForeground(1, Qt::darkGreen);
        }
    }
}

void ObjectPropertiesView::watchCreated(QmlDebugWatch *watch)
{
    if (watch->objectDebugId() == m_object.debugId()
            && qobject_cast<QmlDebugPropertyWatch*>(watch)) {
        connect(watch, SIGNAL(stateChanged(QmlDebugWatch::State)), SLOT(watchStateChanged()));
        setWatched(qobject_cast<QmlDebugPropertyWatch*>(watch)->name(), true);
    }
}

void ObjectPropertiesView::watchStateChanged()
{
    QmlDebugWatch *watch = qobject_cast<QmlDebugWatch*>(sender());

    if (watch->objectDebugId() == m_object.debugId()
            && qobject_cast<QmlDebugPropertyWatch*>(watch)
            && watch->state() == QmlDebugWatch::Inactive) {
        setWatched(qobject_cast<QmlDebugPropertyWatch*>(watch)->name(), false);
    }
}

void ObjectPropertiesView::setWatched(const QString &property, bool watched)
{
    for (int i=0; i<m_tree->topLevelItemCount(); i++) {
        PropertiesViewItem *item = static_cast<PropertiesViewItem *>(m_tree->topLevelItem(i));
        if (item->property.name() == property && item->property.hasNotifySignal()) {
            QFont font = m_tree->font();
            font.setBold(watched);
            item->setFont(0, font);
        }
    }
}

void ObjectPropertiesView::valueChanged(const QByteArray &name, const QVariant &value)
{
    for (int i=0; i<m_tree->topLevelItemCount(); i++) {
        PropertiesViewItem *item = static_cast<PropertiesViewItem *>(m_tree->topLevelItem(i));
        if (item->property.name() == name) {
            setPropertyValue(item, value, !item->property.hasNotifySignal());
            return;
        }
    }
}

void ObjectPropertiesView::itemActivated(QTreeWidgetItem *i)
{
    PropertiesViewItem *item = static_cast<PropertiesViewItem *>(i);
    if (!item->property.name().isEmpty())
        emit activated(m_object, item->property);
}

QT_END_NAMESPACE

#include "objectpropertiesview.moc"