/*
    SPDX-FileCopyrightText: 2006 Pino Toscano <pino@kde.org>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

#include "bookmarklist.h"

// qt/kde includes
#include <QAction>
#include <QCursor>
#include <QDebug>
#include <QHeaderView>
#include <QIcon>
#include <QLayout>
#include <QMenu>
#include <QToolBar>
#include <QTreeWidget>

#include <KLocalizedString>
#include <KTitleWidget>
#include <KTreeWidgetSearchLine>

#include <kwidgetsaddons_version.h>

#include "core/action.h"
#include "core/bookmarkmanager.h"
#include "core/document.h"
#include "pageitemdelegate.h"

static const int BookmarkItemType = QTreeWidgetItem::UserType + 1;
static const int FileItemType = QTreeWidgetItem::UserType + 2;
static const int UrlRole = Qt::UserRole + 1;

class BookmarkItem : public QTreeWidgetItem
{
public:
    explicit BookmarkItem(const KBookmark &bm)
        : QTreeWidgetItem(BookmarkItemType)
        , m_bookmark(bm)
    {
        setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsEditable);
        m_url = m_bookmark.url();
        m_viewport = Okular::DocumentViewport(m_url.fragment(QUrl::FullyDecoded));
        m_url.setFragment(QString());
        setText(0, m_bookmark.fullText());
        if (m_viewport.isValid())
            setData(0, PageItemDelegate::PageRole, QString::number(m_viewport.pageNumber + 1));
    }

    BookmarkItem(const BookmarkItem &) = delete;
    BookmarkItem &operator=(const BookmarkItem &) = delete;

    QVariant data(int column, int role) const override
    {
        switch (role) {
        case Qt::ToolTipRole:
            return m_bookmark.fullText();
        }
        return QTreeWidgetItem::data(column, role);
    }

    bool operator<(const QTreeWidgetItem &other) const override
    {
        if (other.type() == BookmarkItemType) {
            const BookmarkItem *cmp = static_cast<const BookmarkItem *>(&other);
            return m_viewport < cmp->m_viewport;
        }
        return QTreeWidgetItem::operator<(other);
    }

    KBookmark &bookmark()
    {
        return m_bookmark;
    }

    const Okular::DocumentViewport &viewport() const
    {
        return m_viewport;
    }

    QUrl url() const
    {
        return m_url;
    }

private:
    KBookmark m_bookmark;
    QUrl m_url;
    Okular::DocumentViewport m_viewport;
};

class FileItem : public QTreeWidgetItem
{
public:
    FileItem(const QUrl &url, QTreeWidget *tree, Okular::Document *document)
        : QTreeWidgetItem(tree, FileItemType)
    {
        setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsEditable);
        const QString fileString = document->bookmarkManager()->titleForUrl(url);
        setText(0, fileString);
        setData(0, UrlRole, QVariant::fromValue(url));
    }

    FileItem(const FileItem &) = delete;
    FileItem &operator=(const FileItem &) = delete;

    QVariant data(int column, int role) const override
    {
        switch (role) {
        case Qt::ToolTipRole:
            return i18ncp("%1 is the file name", "%1\n\nOne bookmark", "%1\n\n%2 bookmarks", text(0), childCount());
        }
        return QTreeWidgetItem::data(column, role);
    }
};

BookmarkList::BookmarkList(Okular::Document *document, QWidget *parent)
    : QWidget(parent)
    , m_document(document)
    , m_currentDocumentItem(nullptr)
{
    QVBoxLayout *mainlay = new QVBoxLayout(this);
    mainlay->setSpacing(6);

    KTitleWidget *titleWidget = new KTitleWidget(this);
    titleWidget->setLevel(2);
    titleWidget->setText(i18n("Bookmarks"));
    mainlay->addWidget(titleWidget);
    mainlay->setAlignment(titleWidget, Qt::AlignHCenter);
    m_searchLine = new KTreeWidgetSearchLine(this);
    mainlay->addWidget(m_searchLine);
    m_searchLine->setPlaceholderText(i18n("Search..."));

    m_tree = new QTreeWidget(this);
    mainlay->addWidget(m_tree);
    QStringList cols;
    cols.append(QStringLiteral("Bookmarks"));
    m_tree->setContextMenuPolicy(Qt::CustomContextMenu);
    m_tree->setHeaderLabels(cols);
    m_tree->setSortingEnabled(false);
    m_tree->setRootIsDecorated(true);
    m_tree->setAlternatingRowColors(true);
    m_tree->setItemDelegate(new PageItemDelegate(m_tree));
    m_tree->header()->hide();
    m_tree->setSelectionBehavior(QAbstractItemView::SelectRows);
    m_tree->setEditTriggers(QAbstractItemView::EditKeyPressed);
    connect(m_tree, &QTreeWidget::itemActivated, this, &BookmarkList::slotExecuted);
    connect(m_tree, &QTreeWidget::customContextMenuRequested, this, &BookmarkList::slotContextMenu);
    m_searchLine->addTreeWidget(m_tree);

    QToolBar *bookmarkController = new QToolBar(this);
    mainlay->addWidget(bookmarkController);
    bookmarkController->setObjectName(QStringLiteral("BookmarkControlBar"));
    // change toolbar appearance
    bookmarkController->setIconSize(QSize(16, 16));
    bookmarkController->setMovable(false);
    QSizePolicy sp = bookmarkController->sizePolicy();
    sp.setVerticalPolicy(QSizePolicy::Minimum);
    bookmarkController->setSizePolicy(sp);
    // insert a togglebutton [show only bookmarks in the current document]
    m_showBoomarkOnlyAction = bookmarkController->addAction(QIcon::fromTheme(QStringLiteral("bookmarks")), i18n("Current document only"));
    m_showBoomarkOnlyAction->setCheckable(true);
    connect(m_showBoomarkOnlyAction, &QAction::toggled, this, &BookmarkList::slotFilterBookmarks);

    connect(m_document->bookmarkManager(), &Okular::BookmarkManager::bookmarksChanged, this, &BookmarkList::slotBookmarksChanged);

    rebuildTree(m_showBoomarkOnlyAction->isChecked());
}

BookmarkList::~BookmarkList()
{
    m_document->removeObserver(this);
}

void BookmarkList::notifySetup(const QVector<Okular::Page *> &pages, int setupFlags)
{
    Q_UNUSED(pages);
    if (!(setupFlags & Okular::DocumentObserver::UrlChanged))
        return;

    // clear contents
    m_searchLine->clear();

    if (m_showBoomarkOnlyAction->isChecked()) {
        rebuildTree(m_showBoomarkOnlyAction->isChecked());
    } else {
        disconnect(m_tree, &QTreeWidget::itemChanged, this, &BookmarkList::slotChanged);
        if (m_currentDocumentItem && m_currentDocumentItem != m_tree->invisibleRootItem()) {
            m_currentDocumentItem->setIcon(0, QIcon());
        }
        m_currentDocumentItem = itemForUrl(m_document->currentDocument());
        if (m_currentDocumentItem && m_currentDocumentItem != m_tree->invisibleRootItem()) {
            m_currentDocumentItem->setIcon(0, QIcon::fromTheme(QStringLiteral("bookmarks")));
            m_currentDocumentItem->setExpanded(true);
        }
        connect(m_tree, &QTreeWidget::itemChanged, this, &BookmarkList::slotChanged);
    }
}

void BookmarkList::slotFilterBookmarks(bool on)
{
    rebuildTree(on);
}

void BookmarkList::slotExecuted(QTreeWidgetItem *item)
{
    BookmarkItem *bmItem = dynamic_cast<BookmarkItem *>(item);
    if (!bmItem || !bmItem->viewport().isValid())
        return;

    goTo(bmItem);
}

void BookmarkList::slotChanged(QTreeWidgetItem *item)
{
    BookmarkItem *bmItem = dynamic_cast<BookmarkItem *>(item);
    if (bmItem && bmItem->viewport().isValid()) {
        bmItem->bookmark().setFullText(bmItem->text(0));
        m_document->bookmarkManager()->save();
    }

    FileItem *fItem = dynamic_cast<FileItem *>(item);
    if (fItem) {
        const QUrl url = fItem->data(0, UrlRole).value<QUrl>();
        m_document->bookmarkManager()->renameBookmark(url, fItem->text(0));
        m_document->bookmarkManager()->save();
    }
}

void BookmarkList::slotContextMenu(const QPoint p)
{
    QTreeWidgetItem *item = m_tree->itemAt(p);
    BookmarkItem *bmItem = item ? dynamic_cast<BookmarkItem *>(item) : nullptr;
    if (bmItem)
        contextMenuForBookmarkItem(p, bmItem);
    else if (FileItem *fItem = dynamic_cast<FileItem *>(item))
        contextMenuForFileItem(p, fItem);
}

void BookmarkList::contextMenuForBookmarkItem(const QPoint p, BookmarkItem *bmItem)
{
    Q_UNUSED(p);
    if (!bmItem || !bmItem->viewport().isValid())
        return;

    QMenu menu(this);
    QAction *gotobm = menu.addAction(i18n("Go to This Bookmark"));
    QAction *editbm = menu.addAction(QIcon::fromTheme(QStringLiteral("edit-rename")), i18n("Rename Bookmark"));
    QAction *removebm = menu.addAction(QIcon::fromTheme(QStringLiteral("list-remove")), i18n("Remove Bookmark"));
    QAction *res = menu.exec(QCursor::pos());
    if (!res)
        return;

    if (res == gotobm)
        goTo(bmItem);
    else if (res == editbm)
        m_tree->editItem(bmItem, 0);
    else if (res == removebm)
        m_document->bookmarkManager()->removeBookmark(bmItem->url(), bmItem->bookmark());
}

void BookmarkList::contextMenuForFileItem(const QPoint p, FileItem *fItem)
{
    Q_UNUSED(p);
    if (!fItem)
        return;

    const QUrl itemurl = fItem->data(0, UrlRole).value<QUrl>();
    const bool thisdoc = itemurl == m_document->currentDocument();

    QMenu menu(this);
    QAction *open = nullptr;
    if (!thisdoc)
        open = menu.addAction(i18nc("Opens the selected document", "Open Document"));
    QAction *editbm = menu.addAction(QIcon::fromTheme(QStringLiteral("edit-rename")), i18n("Rename Bookmark"));
    QAction *removebm = menu.addAction(QIcon::fromTheme(QStringLiteral("list-remove")), i18n("Remove Bookmarks"));
    QAction *res = menu.exec(QCursor::pos());
    if (!res)
        return;

    if (res == open) {
        Okular::GotoAction action(itemurl.toDisplayString(QUrl::PreferLocalFile), Okular::DocumentViewport());
        m_document->processAction(&action);
    } else if (res == editbm)
        m_tree->editItem(fItem, 0);
    else if (res == removebm) {
        KBookmark::List list;
        for (int i = 0; i < fItem->childCount(); ++i) {
            list.append(static_cast<BookmarkItem *>(fItem->child(i))->bookmark());
        }
        m_document->bookmarkManager()->removeBookmarks(itemurl, list);
    }
}

void BookmarkList::slotBookmarksChanged(const QUrl &url)
{
    // special case here, as m_currentDocumentItem could represent
    // the invisible root item
    if (url == m_document->currentDocument()) {
        selectiveUrlUpdate(m_document->currentDocument(), m_currentDocumentItem);
        return;
    }

    // we are showing the bookmarks for the current document only
    if (m_showBoomarkOnlyAction->isChecked())
        return;

    QTreeWidgetItem *item = itemForUrl(url);
    selectiveUrlUpdate(url, item);
}

QList<QTreeWidgetItem *> createItems(const QUrl &baseurl, const KBookmark::List &bmlist)
{
    Q_UNUSED(baseurl)
    QList<QTreeWidgetItem *> ret;
    for (const KBookmark &bm : bmlist) {
        //        qCDebug(OkularUiDebug).nospace() << "checking '" << tmp << "'";
        //        qCDebug(OkularUiDebug).nospace() << "      vs '" << baseurl << "'";
        // TODO check that bm and baseurl are the same (#ref excluded)
        QTreeWidgetItem *item = new BookmarkItem(bm);
        ret.append(item);
    }
    return ret;
}

void BookmarkList::rebuildTree(bool filter)
{
    // disconnect and reconnect later, otherwise we'll get many itemChanged()
    // signals for all the current items
    disconnect(m_tree, &QTreeWidget::itemChanged, this, &BookmarkList::slotChanged);

    m_currentDocumentItem = nullptr;
    m_tree->clear();

    const QList<QUrl> urls = m_document->bookmarkManager()->files();
    if (filter) {
        if (m_document->isOpened()) {
            for (const QUrl &url : urls) {
                if (url == m_document->currentDocument()) {
                    m_tree->addTopLevelItems(createItems(url, m_document->bookmarkManager()->bookmarks(url)));
                    m_currentDocumentItem = m_tree->invisibleRootItem();
                    break;
                }
            }
        }
    } else {
        QTreeWidgetItem *currenturlitem = nullptr;
        for (const QUrl &url : urls) {
            QList<QTreeWidgetItem *> subitems = createItems(url, m_document->bookmarkManager()->bookmarks(url));
            if (!subitems.isEmpty()) {
                FileItem *item = new FileItem(url, m_tree, m_document);
                item->addChildren(subitems);
                if (!currenturlitem && url == m_document->currentDocument()) {
                    currenturlitem = item;
                }
            }
        }
        if (currenturlitem) {
            currenturlitem->setExpanded(true);
            currenturlitem->setIcon(0, QIcon::fromTheme(QStringLiteral("bookmarks")));
            m_tree->scrollToItem(currenturlitem, QAbstractItemView::PositionAtTop);
            m_currentDocumentItem = currenturlitem;
        }
    }

    m_tree->sortItems(0, Qt::AscendingOrder);

    connect(m_tree, &QTreeWidget::itemChanged, this, &BookmarkList::slotChanged);
}

void BookmarkList::goTo(BookmarkItem *item)
{
    if (item->url() == m_document->currentDocument()) {
        m_document->setViewport(item->viewport(), nullptr, true);
    } else {
        Okular::GotoAction action(item->url().toDisplayString(QUrl::PreferLocalFile), item->viewport());
        m_document->processAction(&action);
    }
}

void BookmarkList::selectiveUrlUpdate(const QUrl &url, QTreeWidgetItem *&item)
{
    disconnect(m_tree, &QTreeWidget::itemChanged, this, &BookmarkList::slotChanged);

    const KBookmark::List urlbookmarks = m_document->bookmarkManager()->bookmarks(url);
    if (urlbookmarks.isEmpty()) {
        if (item != m_tree->invisibleRootItem()) {
            m_tree->invisibleRootItem()->removeChild(item);
            item = nullptr;
        } else if (item) {
            for (int i = item->childCount(); i >= 0; --i) {
                item->removeChild(item->child(i));
            }
        }
    } else {
        bool fileitem_created = false;

        if (item) {
            for (int i = item->childCount() - 1; i >= 0; --i) {
                item->removeChild(item->child(i));
            }
        } else {
            item = new FileItem(url, m_tree, m_document);
            fileitem_created = true;
        }
        if (m_document->isOpened() && url == m_document->currentDocument()) {
            item->setIcon(0, QIcon::fromTheme(QStringLiteral("bookmarks")));
            item->setExpanded(true);
        }
        item->addChildren(createItems(url, urlbookmarks));

        if (fileitem_created) {
            // we need to sort also the parent of the new file item,
            // so it can be properly shown in the correct place
            m_tree->invisibleRootItem()->sortChildren(0, Qt::AscendingOrder);
        }
        item->sortChildren(0, Qt::AscendingOrder);
    }

    connect(m_tree, &QTreeWidget::itemChanged, this, &BookmarkList::slotChanged);
}

QTreeWidgetItem *BookmarkList::itemForUrl(const QUrl &url) const
{
    const int count = m_tree->topLevelItemCount();
    for (int i = 0; i < count; ++i) {
        QTreeWidgetItem *item = m_tree->topLevelItem(i);
        const QUrl itemurl = item->data(0, UrlRole).value<QUrl>();
        if (itemurl.isValid() && itemurl == url) {
            return item;
        }
    }
    return nullptr;
}

#include "moc_bookmarklist.cpp"
