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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** This file is part of Qt Creator.
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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
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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****************************************************************************/

#include "kitmanagerconfigwidget.h"

#include "kit.h"
#include "kitmanager.h"

#include <utils/detailswidget.h>
#include <utils/qtcassert.h>

#include <QFileDialog>
#include <QGridLayout>
#include <QLabel>
#include <QLineEdit>
#include <QPainter>
#include <QToolButton>
#include <QScrollArea>
#include <QSizePolicy>
#include <QStyle>

static const char WORKING_COPY_KIT_ID[] = "modified kit";

namespace ProjectExplorer {
namespace Internal {

KitManagerConfigWidget::KitManagerConfigWidget(Kit *k) :
    m_layout(new QGridLayout),
    m_iconButton(new QToolButton),
    m_nameEdit(new QLineEdit),
    m_kit(k),
    m_modifiedKit(new Kit(Core::Id(WORKING_COPY_KIT_ID))),
    m_fixingKit(false)
{
    m_layout->addWidget(m_nameEdit, 0, WidgetColumn);
    m_layout->addWidget(m_iconButton, 0, ButtonColumn);
    setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);

    QWidget *inner = new QWidget;
    inner->setLayout(m_layout);

    QScrollArea *scroll = new QScrollArea;
    scroll->setWidget(inner);
    scroll->setFrameShape(QFrame::NoFrame);
    scroll->setWidgetResizable(true);
    scroll->setFocusPolicy(Qt::NoFocus);

    QGridLayout *mainLayout = new QGridLayout(this);
    mainLayout->setMargin(1);
    mainLayout->addWidget(scroll, 0, 0);

    static const Qt::Alignment alignment
            = static_cast<Qt::Alignment>(style()->styleHint(QStyle::SH_FormLayoutLabelAlignment));
    QString toolTip = tr("Kit name and icon.");
    QLabel *label = createLabel(tr("Name:"), toolTip);
    m_layout->addWidget(label, 0, LabelColumn, alignment);
    m_iconButton->setToolTip(toolTip);

    discard();

    connect(m_iconButton, SIGNAL(clicked()), this, SLOT(setIcon()));
    connect(m_nameEdit, SIGNAL(textChanged(QString)), this, SLOT(setDisplayName()));

    KitManager *km = KitManager::instance();
    connect(km, SIGNAL(unmanagedKitUpdated(ProjectExplorer::Kit*)),
            this, SLOT(workingCopyWasUpdated(ProjectExplorer::Kit*)));
    connect(km, SIGNAL(kitUpdated(ProjectExplorer::Kit*)),
            this, SLOT(kitWasUpdated(ProjectExplorer::Kit*)));
}

KitManagerConfigWidget::~KitManagerConfigWidget()
{
    qDeleteAll(m_widgets);
    m_widgets.clear();

    KitManager::deleteKit(m_modifiedKit);
    // Make sure our workingCopy did not get registered somehow:
    foreach (const Kit *k, KitManager::instance()->kits())
        QTC_CHECK(k->id() != Core::Id(WORKING_COPY_KIT_ID));
}

QString KitManagerConfigWidget::displayName() const
{
    return m_nameEdit->text();
}

void KitManagerConfigWidget::apply()
{
    bool mustSetDefault = m_isDefaultKit;
    KitManager *km = KitManager::instance();
    bool mustRegister = false;
    if (!m_kit) {
        mustRegister = true;
        m_kit = new Kit;
    }
    m_kit->copyFrom(m_modifiedKit);//m_isDefaultKit is reset in discard() here.
    if (mustRegister)
        km->registerKit(m_kit);

    if (mustSetDefault)
        km->setDefaultKit(m_kit);

    m_isDefaultKit = mustSetDefault;
    emit dirty();
}

void KitManagerConfigWidget::discard()
{
    if (m_kit) {
        m_modifiedKit->copyFrom(m_kit);
        m_isDefaultKit = (m_kit == KitManager::instance()->defaultKit());
    } else {
        // This branch will only ever get reached once during setup of widget for a not-yet-existing
        // kit.
        m_isDefaultKit = false;
    }
    m_iconButton->setIcon(m_modifiedKit->icon());
    m_nameEdit->setText(m_modifiedKit->displayName());
    emit dirty();
}

bool KitManagerConfigWidget::isDirty() const
{
    return !m_kit
            || !m_kit->isEqual(m_modifiedKit)
            || m_isDefaultKit != (KitManager::instance()->defaultKit() == m_kit);
}

bool KitManagerConfigWidget::isValid() const
{
    return m_modifiedKit->isValid();
}

bool KitManagerConfigWidget::hasWarning() const
{
    return m_modifiedKit->hasWarning();
}

QString KitManagerConfigWidget::validityMessage() const
{
    return m_modifiedKit->toHtml();
}

void KitManagerConfigWidget::addConfigWidget(ProjectExplorer::KitConfigWidget *widget)
{
    QTC_ASSERT(widget, return);
    QTC_ASSERT(!m_widgets.contains(widget), return);

    QString name = widget->displayName();
    QString toolTip = widget->toolTip();

    int row = m_layout->rowCount();
    m_layout->addWidget(widget->mainWidget(), row, WidgetColumn);
    if (QWidget *button = widget->buttonWidget())
        m_layout->addWidget(button, row, ButtonColumn);

    static const Qt::Alignment alignment
        = static_cast<Qt::Alignment>(style()->styleHint(QStyle::SH_FormLayoutLabelAlignment));
    QLabel *label = createLabel(name, toolTip);
    m_layout->addWidget(label, row, LabelColumn, alignment);
    m_widgets.append(widget);
    m_labels.append(label);
}

void KitManagerConfigWidget::updateVisibility()
{
    int count = m_widgets.count();
    for (int i = 0; i < count; ++i) {
        KitConfigWidget *widget = m_widgets.at(i);
        bool visible = widget->visibleInKit();
        widget->mainWidget()->setVisible(visible);
        if (widget->buttonWidget())
            widget->buttonWidget()->setVisible(visible);
        m_labels.at(i)->setVisible(visible);
    }
}

void KitManagerConfigWidget::makeReadOnly()
{
    foreach (KitConfigWidget *w, m_widgets)
        w->makeReadOnly();
    m_iconButton->setEnabled(false);
    m_nameEdit->setEnabled(false);
}

Kit *KitManagerConfigWidget::workingCopy() const
{
    return m_modifiedKit;
}

bool KitManagerConfigWidget::configures(Kit *k) const
{
    return m_kit == k;
}

void KitManagerConfigWidget::setIsDefaultKit(bool d)
{
    if (m_isDefaultKit == d)
        return;
    m_isDefaultKit = d;
    emit dirty();
}

bool KitManagerConfigWidget::isDefaultKit() const
{
    return m_isDefaultKit;
}

void KitManagerConfigWidget::removeKit()
{
    if (!m_kit)
        return;
    KitManager::instance()->deregisterKit(m_kit);
}

void KitManagerConfigWidget::setIcon()
{
    const QString path = QFileDialog::getOpenFileName(this, tr("Select Icon"), m_modifiedKit->iconPath(), tr("Images (*.png *.xpm *.jpg)"));
    if (path.isEmpty())
        return;

    const QIcon icon = QIcon(path);
    if (icon.isNull())
        return;

    m_iconButton->setIcon(icon);
    m_modifiedKit->setIconPath(path);
    emit dirty();
}

void KitManagerConfigWidget::setDisplayName()
{
    int pos = m_nameEdit->cursorPosition();
    m_modifiedKit->setDisplayName(m_nameEdit->text());
    m_nameEdit->setCursorPosition(pos);
}

void KitManagerConfigWidget::workingCopyWasUpdated(Kit *k)
{
    if (k != m_modifiedKit || m_fixingKit)
        return;

    m_fixingKit = true;
    k->fix();
    m_fixingKit = false;

    foreach (KitConfigWidget *w, m_widgets)
        w->refresh();
    m_nameEdit->setText(k->displayName());
    m_iconButton->setIcon(k->icon());
    updateVisibility();
    emit dirty();
}

void KitManagerConfigWidget::kitWasUpdated(Kit *k)
{
    if (m_kit == k)
        discard();
    updateVisibility();
}

QLabel *KitManagerConfigWidget::createLabel(const QString &name, const QString &toolTip)
{
    QLabel *label = new QLabel(name);
    label->setToolTip(toolTip);
    return label;
}

void KitManagerConfigWidget::paintEvent(QPaintEvent *)
{
    QPainter p(this);
    if (m_background.size() != size())
        m_background = Utils::DetailsWidget::createBackground(size(), 0, this);
    p.drawPixmap(rect(), m_background);
}

} // namespace Internal
} // namespace ProjectExplorer
