/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
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****************************************************************************/

#include "kitoptionspage.h"

#include "kitmodel.h"
#include "kit.h"
#include "projectexplorerconstants.h"
#include "projectexplorericons.h"
#include "kitmanagerconfigwidget.h"
#include "kitmanager.h"

#include <QHBoxLayout>
#include <QHeaderView>
#include <QItemSelectionModel>
#include <QPushButton>
#include <QTreeView>
#include <QVBoxLayout>

namespace ProjectExplorer {
namespace Internal {

// --------------------------------------------------------------------------
// KitOptionsPageWidget:
// --------------------------------------------------------------------------

class KitOptionsPageWidget : public QWidget
{
public:
    KitOptionsPageWidget();

    QModelIndex currentIndex() const;
    Kit *currentKit() const;

    void kitSelectionChanged();
    void addNewKit();
    void cloneKit();
    void removeKit();
    void makeDefaultKit();
    void updateState();

public:
    QTreeView *m_kitsView = nullptr;
    QPushButton *m_addButton = nullptr;
    QPushButton *m_cloneButton = nullptr;
    QPushButton *m_delButton = nullptr;
    QPushButton *m_makeDefaultButton = nullptr;

    KitModel *m_model = nullptr;
    QItemSelectionModel *m_selectionModel = nullptr;
    QWidget *m_currentWidget = nullptr;
};

KitOptionsPageWidget::KitOptionsPageWidget()
{
    m_kitsView = new QTreeView(this);
    m_kitsView->setUniformRowHeights(true);
    m_kitsView->header()->setStretchLastSection(true);
    m_kitsView->setSizePolicy(m_kitsView->sizePolicy().horizontalPolicy(),
                              QSizePolicy::Ignored);

    m_addButton = new QPushButton(KitOptionsPage::tr("Add"), this);
    m_cloneButton = new QPushButton(KitOptionsPage::tr("Clone"), this);
    m_delButton = new QPushButton(KitOptionsPage::tr("Remove"), this);
    m_makeDefaultButton = new QPushButton(KitOptionsPage::tr("Make Default"), this);

    auto buttonLayout = new QVBoxLayout;
    buttonLayout->setSpacing(6);
    buttonLayout->setContentsMargins(0, 0, 0, 0);
    buttonLayout->addWidget(m_addButton);
    buttonLayout->addWidget(m_cloneButton);
    buttonLayout->addWidget(m_delButton);
    buttonLayout->addWidget(m_makeDefaultButton);
    buttonLayout->addStretch();

    auto horizontalLayout = new QHBoxLayout;
    horizontalLayout->addWidget(m_kitsView);
    horizontalLayout->addLayout(buttonLayout);

    auto verticalLayout = new QVBoxLayout(this);
    verticalLayout->addLayout(horizontalLayout);

    m_model = new Internal::KitModel(verticalLayout, this);
    connect(m_model, &Internal::KitModel::kitStateChanged,
            this, &KitOptionsPageWidget::updateState);
    verticalLayout->setStretch(0, 1);
    verticalLayout->setStretch(1, 0);

    m_kitsView->setModel(m_model);
    m_kitsView->header()->setSectionResizeMode(0, QHeaderView::Stretch);
    m_kitsView->expandAll();

    m_selectionModel = m_kitsView->selectionModel();
    connect(m_selectionModel, &QItemSelectionModel::selectionChanged,
            this, &KitOptionsPageWidget::kitSelectionChanged);
    connect(KitManager::instance(), &KitManager::kitAdded,
            this, &KitOptionsPageWidget::kitSelectionChanged);
    connect(KitManager::instance(), &KitManager::kitRemoved,
            this, &KitOptionsPageWidget::kitSelectionChanged);
    connect(KitManager::instance(), &KitManager::kitUpdated,
            this, &KitOptionsPageWidget::kitSelectionChanged);

    // Set up add menu:
    connect(m_addButton, &QAbstractButton::clicked,
            this, &KitOptionsPageWidget::addNewKit);
    connect(m_cloneButton, &QAbstractButton::clicked,
            this, &KitOptionsPageWidget::cloneKit);
    connect(m_delButton, &QAbstractButton::clicked,
            this, &KitOptionsPageWidget::removeKit);
    connect(m_makeDefaultButton, &QAbstractButton::clicked,
            this, &KitOptionsPageWidget::makeDefaultKit);

    updateState();
}

void KitOptionsPageWidget::kitSelectionChanged()
{
    QModelIndex current = currentIndex();
    QWidget *newWidget = m_model->widget(current);
    if (newWidget == m_currentWidget)
        return;

    if (m_currentWidget)
        m_currentWidget->setVisible(false);

    m_currentWidget = newWidget;

    if (m_currentWidget) {
        m_currentWidget->setVisible(true);
        m_kitsView->scrollTo(current);
    }

    updateState();
}

void KitOptionsPageWidget::addNewKit()
{
    Kit *k = m_model->markForAddition(0);

    QModelIndex newIdx = m_model->indexOf(k);
    m_selectionModel->select(newIdx,
                             QItemSelectionModel::Clear
                             | QItemSelectionModel::SelectCurrent
                             | QItemSelectionModel::Rows);
}

Kit *KitOptionsPageWidget::currentKit() const
{
    return m_model->kit(currentIndex());
}

void KitOptionsPageWidget::cloneKit()
{
    Kit *current = currentKit();
    if (!current)
        return;

    Kit *k = m_model->markForAddition(current);
    QModelIndex newIdx = m_model->indexOf(k);
    m_kitsView->scrollTo(newIdx);
    m_selectionModel->select(newIdx,
                             QItemSelectionModel::Clear
                             | QItemSelectionModel::SelectCurrent
                             | QItemSelectionModel::Rows);
}

void KitOptionsPageWidget::removeKit()
{
    if (Kit *k = currentKit())
        m_model->markForRemoval(k);
}

void KitOptionsPageWidget::makeDefaultKit()
{
    m_model->setDefaultKit(currentIndex());
    updateState();
}

void KitOptionsPageWidget::updateState()
{
    if (!m_kitsView)
        return;

    bool canCopy = false;
    bool canDelete = false;
    bool canMakeDefault = false;

    if (Kit *k = currentKit()) {
        canCopy = true;
        canDelete = !k->isAutoDetected();
        canMakeDefault = !m_model->isDefaultKit(k);
    }

    m_cloneButton->setEnabled(canCopy);
    m_delButton->setEnabled(canDelete);
    m_makeDefaultButton->setEnabled(canMakeDefault);
}

QModelIndex KitOptionsPageWidget::currentIndex() const
{
    if (!m_selectionModel)
        return QModelIndex();

    QModelIndexList idxs = m_selectionModel->selectedRows();
    if (idxs.count() != 1)
        return QModelIndex();
    return idxs.at(0);
}

} // namespace Internal

// --------------------------------------------------------------------------
// KitOptionsPage:
// --------------------------------------------------------------------------

static KitOptionsPage *theKitOptionsPage = nullptr;

KitOptionsPage::KitOptionsPage()
{
    theKitOptionsPage = this;
    setId(Constants::KITS_SETTINGS_PAGE_ID);
    setDisplayName(tr("Kits"));
    setCategory(Constants::KITS_SETTINGS_CATEGORY);
    setDisplayCategory(QCoreApplication::translate("ProjectExplorer", "Kits"));
    setCategoryIcon(Utils::Icon({{":/projectexplorer/images/settingscategory_kits.png",
                    Utils::Theme::PanelTextColorDark}}, Utils::Icon::Tint));
}

QWidget *KitOptionsPage::widget()
{
    if (!m_widget)
        m_widget = new Internal::KitOptionsPageWidget;

    return m_widget;
}

void KitOptionsPage::apply()
{
    if (m_widget)
        m_widget->m_model->apply();
}

void KitOptionsPage::finish()
{
    if (m_widget) {
        delete m_widget;
        m_widget = nullptr;
    }
}

void KitOptionsPage::showKit(Kit *k)
{
    if (!k)
        return;

    (void) widget();
    QModelIndex index = m_widget->m_model->indexOf(k);
    m_widget->m_selectionModel->select(index,
                                QItemSelectionModel::Clear
                                | QItemSelectionModel::SelectCurrent
                                | QItemSelectionModel::Rows);
    m_widget->m_kitsView->scrollTo(index);
}

KitOptionsPage *KitOptionsPage::instance()
{
    return theKitOptionsPage;
}

} // namespace ProjectExplorer
