// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "bookmarkdialog.h"
#include "bookmarkfiltermodel.h"
#include "bookmarkitem.h"
#include "bookmarkmodel.h"
#include "helpenginewrapper.h"
#include "tracer.h"

#include <QtGui/QKeyEvent>
#include <QtWidgets/QMenu>

QT_BEGIN_NAMESPACE

using namespace Qt::StringLiterals;

BookmarkDialog::BookmarkDialog(BookmarkModel *sourceModel, const QString &title,
        const QString &url, QWidget *parent)
    : QDialog(parent)
    , m_url(url)
    , m_title(title)
    , bookmarkModel(sourceModel)
{
    TRACE_OBJ
    ui.setupUi(this);

    ui.bookmarkEdit->setText(m_title);
    ui.newFolderButton->setVisible(false);
    ui.buttonBox->button(QDialogButtonBox::Ok)->setDefault(true);

    connect(ui.buttonBox, &QDialogButtonBox::accepted, this, &BookmarkDialog::accepted);
    connect(ui.buttonBox, &QDialogButtonBox::rejected, this, &BookmarkDialog::rejected);
    connect(ui.newFolderButton, &QAbstractButton::clicked, this, &BookmarkDialog::addFolder);
    connect(ui.toolButton, &QAbstractButton::clicked, this, &BookmarkDialog::toolButtonClicked);
    connect(ui.bookmarkEdit, &QLineEdit::textChanged, this, &BookmarkDialog::textChanged);

    bookmarkProxyModel = new BookmarkFilterModel(this);
    bookmarkProxyModel->setSourceModel(bookmarkModel);
    ui.bookmarkFolders->setModel(bookmarkProxyModel);
    connect(ui.bookmarkFolders, &QComboBox::currentIndexChanged,
            this, QOverload<int>::of(&BookmarkDialog::currentIndexChanged));

    bookmarkTreeModel = new BookmarkTreeModel(this);
    bookmarkTreeModel->setSourceModel(bookmarkModel);
    ui.treeView->setModel(bookmarkTreeModel);

    ui.treeView->expandAll();
    ui.treeView->setVisible(false);
    ui.treeView->installEventFilter(this);
    ui.treeView->viewport()->installEventFilter(this);
    ui.treeView->setContextMenuPolicy(Qt::CustomContextMenu);

    connect(ui.treeView, &QWidget::customContextMenuRequested,
            this, &BookmarkDialog::customContextMenuRequested);
    connect(ui.treeView->selectionModel(), &QItemSelectionModel::currentChanged,
            this, QOverload<const QModelIndex &>::of(&BookmarkDialog::currentIndexChanged));

    ui.bookmarkFolders->setCurrentIndex(ui.bookmarkFolders->count() > 1 ? 1 : 0);

    const HelpEngineWrapper &helpEngine = HelpEngineWrapper::instance();
    if (helpEngine.usesAppFont())
        setFont(helpEngine.appFont());
}

BookmarkDialog::~BookmarkDialog()
{
    TRACE_OBJ
}

bool BookmarkDialog::isRootItem(const QModelIndex &index) const
{
    return !bookmarkTreeModel->parent(index).isValid();
}

bool BookmarkDialog::eventFilter(QObject *object, QEvent *event)
{
    TRACE_OBJ
    if (object != ui.treeView && object != ui.treeView->viewport())
        return QWidget::eventFilter(object, event);

    if (event->type() == QEvent::KeyPress) {
        QKeyEvent *ke = static_cast<QKeyEvent*>(event);
        switch (ke->key()) {
            case Qt::Key_F2: {
                const QModelIndex &index = ui.treeView->currentIndex();
                if (!isRootItem(index)) {
                    bookmarkModel->setItemsEditable(true);
                    ui.treeView->edit(index);
                    bookmarkModel->setItemsEditable(false);
                }
            }   break;
            default: break;
        }
    }

    return QObject::eventFilter(object, event);
}

void BookmarkDialog::currentIndexChanged(int row)
{
    TRACE_OBJ
    QModelIndex next = bookmarkProxyModel->index(row, 0, QModelIndex());
    if (next.isValid()) {
        next = bookmarkProxyModel->mapToSource(next);
        ui.treeView->setCurrentIndex(bookmarkTreeModel->mapFromSource(next));
    }
}

void BookmarkDialog::currentIndexChanged(const QModelIndex &index)
{
    TRACE_OBJ
    const QModelIndex current = bookmarkTreeModel->mapToSource(index);
    if (current.isValid()) {
        const int row = bookmarkProxyModel->mapFromSource(current).row();
        ui.bookmarkFolders->setCurrentIndex(row);
    }
}

void BookmarkDialog::accepted()
{
    TRACE_OBJ
    QModelIndex index = ui.treeView->currentIndex();
    if (index.isValid()) {
        index = bookmarkModel->addItem(bookmarkTreeModel->mapToSource(index));
        bookmarkModel->setData(index, DataVector() << m_title << m_url << false);
    } else
        rejected();

    accept();
}

void BookmarkDialog::rejected()
{
    TRACE_OBJ
    for (const QPersistentModelIndex &index : std::as_const(cache))
        bookmarkModel->removeItem(index);
    reject();
}

void BookmarkDialog::addFolder()
{
    TRACE_OBJ
    QModelIndex index = ui.treeView->currentIndex();
    if (index.isValid()) {
        index = bookmarkModel->addItem(bookmarkTreeModel->mapToSource(index),
            true);
        cache.append(index);

        index = bookmarkTreeModel->mapFromSource(index);
        if (index.isValid()) {
            bookmarkModel->setItemsEditable(true);
            ui.treeView->edit(index);
            ui.treeView->expand(index);
            ui.treeView->setCurrentIndex(index);
            bookmarkModel->setItemsEditable(false);
        }
    }
}

void BookmarkDialog::toolButtonClicked()
{
    TRACE_OBJ
    const bool visible = !ui.treeView->isVisible();
    ui.treeView->setVisible(visible);
    ui.newFolderButton->setVisible(visible);

    if (visible) {
        resize(QSize(width(), 400));
        ui.toolButton->setText("-"_L1);
    } else {
        resize(width(), minimumHeight());
        ui.toolButton->setText("+"_L1);
    }
}

void BookmarkDialog::textChanged(const QString& text)
{
    m_title = text;
}

void BookmarkDialog::customContextMenuRequested(const QPoint &point)
{
    TRACE_OBJ
    const QModelIndex &index = ui.treeView->currentIndex();
    if (isRootItem(index))
        return; // check if we go to rename the "Bookmarks Menu", bail

    QMenu menu(QString(), this);
    QAction *renameItem = menu.addAction(tr("Rename Folder"));

    QAction *picked = menu.exec(ui.treeView->mapToGlobal(point));
    if (picked == renameItem) {
        bookmarkModel->setItemsEditable(true);
        ui.treeView->edit(index);
        bookmarkModel->setItemsEditable(false);
    }
}

QT_END_NAMESPACE