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#include "cmakeprojectconstants.h"
#include "cmakekitconfigwidget.h"
#include "cmakekitinformation.h"
#include "cmaketoolmanager.h"
#include "cmaketool.h"

#include <utils/qtcassert.h>
#include <coreplugin/icore.h>
#include <projectexplorer/kit.h>
#include <projectexplorer/projectexplorerconstants.h>

#include <QComboBox>
#include <QPushButton>

namespace CMakeProjectManager {
namespace Internal {

CMakeKitConfigWidget::CMakeKitConfigWidget(ProjectExplorer::Kit *kit,
                                           const ProjectExplorer::KitInformation *ki) :
    ProjectExplorer::KitConfigWidget(kit, ki),
    m_removingItem(false)
{
    m_comboBox = new QComboBox;
    m_comboBox->setEnabled(false);
    m_comboBox->setToolTip(toolTip());

    foreach (CMakeTool *tool, CMakeToolManager::cmakeTools())
        cmakeToolAdded(tool->id());

    updateComboBox();

    refresh();
    connect(m_comboBox, static_cast<void(QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
            this, &CMakeKitConfigWidget::currentCMakeToolChanged);

    m_manageButton = new QPushButton(KitConfigWidget::msgManage());
    m_manageButton->setContentsMargins(0, 0, 0, 0);
    connect(m_manageButton, &QPushButton::clicked,
            this, &CMakeKitConfigWidget::manageCMakeTools);

    CMakeToolManager *cmakeMgr = CMakeToolManager::instance();
    connect(cmakeMgr, &CMakeToolManager::cmakeAdded,
            this, &CMakeKitConfigWidget::cmakeToolAdded);
    connect(cmakeMgr, &CMakeToolManager::cmakeRemoved,
            this, &CMakeKitConfigWidget::cmakeToolRemoved);
    connect(cmakeMgr, &CMakeToolManager::cmakeUpdated,
            this, &CMakeKitConfigWidget::cmakeToolUpdated);
}

CMakeKitConfigWidget::~CMakeKitConfigWidget()
{
    delete m_comboBox;
    delete m_manageButton;
}

QString CMakeKitConfigWidget::displayName() const
{
    return tr("CMake Tool:");
}

void CMakeKitConfigWidget::makeReadOnly()
{
    m_comboBox->setEnabled(false);
}

void CMakeKitConfigWidget::refresh()
{
    CMakeTool *tool = CMakeKitInformation::cmakeTool(m_kit);
    m_comboBox->setCurrentIndex(tool == 0 ? -1 : indexOf(tool->id()));
}

QWidget *CMakeKitConfigWidget::mainWidget() const
{
    return m_comboBox;
}

QWidget *CMakeKitConfigWidget::buttonWidget() const
{
    return m_manageButton;
}

QString CMakeKitConfigWidget::toolTip() const
{
    return tr("The CMake Tool to use when building a project with CMake.<br>"
              "This setting is ignored when using other build systems.");
}

int CMakeKitConfigWidget::indexOf(const Core::Id &id)
{
    for (int i = 0; i < m_comboBox->count(); ++i) {
        if (id == Core::Id::fromSetting(m_comboBox->itemData(i)))
            return i;
    }
    return -1;
}

void CMakeKitConfigWidget::cmakeToolAdded(const Core::Id &id)
{
    const CMakeTool *tool = CMakeToolManager::findById(id);
    QTC_ASSERT(tool, return);

    m_comboBox->addItem(tool->displayName(), tool->id().toSetting());
    updateComboBox();
    refresh();
}

void CMakeKitConfigWidget::cmakeToolUpdated(const Core::Id &id)
{
    const int pos = indexOf(id);
    QTC_ASSERT(pos >= 0, return);

    const CMakeTool *tool = CMakeToolManager::findById(id);
    QTC_ASSERT(tool, return);

    m_comboBox->setItemText(pos, tool->displayName());
}

void CMakeKitConfigWidget::cmakeToolRemoved(const Core::Id &id)
{
    const int pos = indexOf(id);
    QTC_ASSERT(pos >= 0, return);

    // do not handle the current index changed signal
    m_removingItem = true;
    m_comboBox->removeItem(pos);
    m_removingItem = false;

    // update the checkbox and set the current index
    updateComboBox();
    refresh();
}

void CMakeKitConfigWidget::updateComboBox()
{
    // remove unavailable cmake tool:
    int pos = indexOf(Core::Id());
    if (pos >= 0)
        m_comboBox->removeItem(pos);

    if (m_comboBox->count() == 0) {
        m_comboBox->addItem(tr("<No CMake Tool available>"),
                            Core::Id().toSetting());
        m_comboBox->setEnabled(false);
    } else {
        m_comboBox->setEnabled(true);
    }
}

void CMakeKitConfigWidget::currentCMakeToolChanged(int index)
{
    if (m_removingItem)
        return;

    const Core::Id id = Core::Id::fromSetting(m_comboBox->itemData(index));
    CMakeKitInformation::setCMakeTool(m_kit, id);
}

void CMakeKitConfigWidget::manageCMakeTools()
{
    Core::ICore::showOptionsDialog(Constants::CMAKE_SETTINGSPAGE_ID,
                                   buttonWidget());
}

} // namespace Internal
} // namespace CMakeProjectManager