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#include "kitchooser.h"

#include "kitconfigwidget.h"
#include "kitinformation.h"
#include "kitmanager.h"
#include "projectexplorerconstants.h"

#include <coreplugin/icore.h>

#include <QComboBox>
#include <QHBoxLayout>
#include <QPushButton>
#include <QSettings>

namespace ProjectExplorer {

const char lastKitKey[] = "LastSelectedKit";

KitChooser::KitChooser(QWidget *parent) :
    QWidget(parent),
    m_kitMatcher([](const Kit *k) {
        return k->isValid();
    })
{
    m_chooser = new QComboBox(this);
    m_chooser->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Fixed);
    m_manageButton = new QPushButton(KitConfigWidget::msgManage(), this);

    QHBoxLayout *layout = new QHBoxLayout(this);
    layout->setContentsMargins(0, 0, 0, 0);
    layout->addWidget(m_chooser);
    layout->addWidget(m_manageButton);
    setFocusProxy(m_manageButton);

    connect(m_chooser, SIGNAL(currentIndexChanged(int)), SLOT(onCurrentIndexChanged(int)));
    connect(m_chooser, SIGNAL(activated(int)), SIGNAL(activated(int)));
    connect(m_manageButton, SIGNAL(clicked()), SLOT(onManageButtonClicked()));
    connect(KitManager::instance(), SIGNAL(kitsChanged()), SLOT(populate()));
}

void KitChooser::onManageButtonClicked()
{
    Core::ICore::showOptionsDialog(Constants::KITS_SETTINGS_PAGE_ID, this);
}

void KitChooser::onCurrentIndexChanged(int index)
{
    if (Kit *kit = kitAt(index))
        setToolTip(kitToolTip(kit));
    else
        setToolTip(QString());
    emit currentIndexChanged(index);
}

QString KitChooser::kitText(const Kit *k) const
{
    return k->displayName();
}

QString KitChooser::kitToolTip(Kit *k) const
{
    return k->toHtml();
}

void KitChooser::populate()
{
    m_chooser->clear();
    foreach (Kit *kit, KitManager::sortKits(KitManager::kits())) {
        if (m_kitMatcher(kit)) {
            m_chooser->addItem(kitText(kit), qVariantFromValue(kit->id()));
            m_chooser->setItemData(m_chooser->count() - 1, kitToolTip(kit), Qt::ToolTipRole);
        }
    }

    const int n = m_chooser->count();
    const int index = Core::ICore::settings()->value(QLatin1String(lastKitKey)).toInt();
    if (0 <= index && index < n)
        m_chooser->setCurrentIndex(index);
    m_chooser->setEnabled(n > 1);

    if (n > 1)
        setFocusProxy(m_chooser);
    else
        setFocusProxy(m_manageButton);

}

Kit *KitChooser::currentKit() const
{
    const int index = m_chooser->currentIndex();
    Core::ICore::settings()->setValue(QLatin1String(lastKitKey), index);
    return index == -1 ? 0 : kitAt(index);
}

void KitChooser::setCurrentKitId(Core::Id id)
{
    for (int i = 0, n = m_chooser->count(); i != n; ++i) {
        if (kitAt(i)->id() == id) {
            m_chooser->setCurrentIndex(i);
            break;
        }
    }
}

Core::Id KitChooser::currentKitId() const
{
    Kit *kit = currentKit();
    return kit ? kit->id() : Core::Id();
}

void KitChooser::setKitMatcher(const KitChooser::KitMatcher &matcher)
{
    m_kitMatcher = matcher;
    populate();
}

Kit *KitChooser::kitAt(int index) const
{
    Core::Id id = qvariant_cast<Core::Id>(m_chooser->itemData(index));
    return KitManager::find(id);
}

} // namespace ProjectExplorer