// -*- indent-tabs-mode:nil -*-
// vim: set ts=4 sts=4 sw=4 et:
/* This file is part of the KDE project
   Copyright (C) 2000 David Faure <faure@kde.org>
   Copyright (C) 2002-2003 Alexander Kellett <lypanov@kde.org>

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public
   License version 2 or at your option version 3 as published by
   the Free Software Foundation.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; see the file COPYING.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#include "commands.h"
#include "commands_p.h"
#include "model.h"
#include "kinsertionsort_p.h"

#include <kdebug.h>
#include <klocale.h>
#include <kbookmarkmanager.h>
#include <kdesktopfile.h>

QString KEBMacroCommand::affectedBookmarks() const
{
    const int commandCount = childCount();
    if (commandCount == 0) {
        return QString();
    }
    // Need to use dynamic_cast here due to going cross-hierarchy, but it should never return 0.
    int i = 0;
    QString affectBook = dynamic_cast<const IKEBCommand *>(child(i))->affectedBookmarks();
    ++i;
    for(; i < commandCount; ++i) {
        affectBook = KBookmark::commonParent( affectBook, dynamic_cast<const IKEBCommand *>(child(i))->affectedBookmarks());
    }
    return affectBook;
}

DeleteManyCommand::DeleteManyCommand(KBookmarkModel* model, const QString &name, const QList<KBookmark> & bookmarks)
    : KEBMacroCommand(name)
{
    QList<KBookmark>::const_iterator it, begin;
    begin = bookmarks.constBegin();
    it = bookmarks.constEnd();
    while(begin != it)
    {
        --it;
        new DeleteCommand(model, (*it).address(), false, this);
    }
}

////

CreateCommand::CreateCommand(KBookmarkModel* model, const QString &address, QUndoCommand* parent)
    : QUndoCommand(parent), m_model(model), m_to(address),
      m_group(false), m_separator(true), m_originalBookmark(QDomElement())
{
    setText(i18nc("(qtundo-format)", "Insert Separator"));
}

CreateCommand::CreateCommand(KBookmarkModel* model, const QString &address,
                             const QString &text, const QString &iconPath,
                             const KUrl &url, QUndoCommand* parent)
    : QUndoCommand(parent), m_model(model), m_to(address), m_text(text), m_iconPath(iconPath), m_url(url),
      m_group(false), m_separator(false), m_originalBookmark(QDomElement())
{
    setText(i18nc("(qtundo-format)", "Create Bookmark"));
}

CreateCommand::CreateCommand(KBookmarkModel* model, const QString &address,
                             const QString &text, const QString &iconPath,
                             bool open, QUndoCommand* parent)
    : QUndoCommand(parent), m_model(model), m_to(address), m_text(text), m_iconPath(iconPath),
      m_group(true), m_separator(false), m_open(open), m_originalBookmark(QDomElement())
{
    setText(i18nc("(qtundo-format)", "Create Folder"));
}

CreateCommand::CreateCommand(KBookmarkModel* model, const QString &address,
                             const KBookmark &original, const QString &name, QUndoCommand* parent)
    : QUndoCommand(parent), m_model(model), m_to(address), m_group(false), m_separator(false),
      m_open(false), m_originalBookmark(original),
      m_originalBookmarkDocRef(m_originalBookmark.internalElement().ownerDocument())
{
    setText(i18nc("(qtundo-format)", "Copy %1", name));
}

void CreateCommand::redo()
{
    QString parentAddress = KBookmark::parentAddress(m_to);
    KBookmarkGroup parentGroup =
        m_model->bookmarkManager()->findByAddress(parentAddress).toGroup();

    QString previousSibling = KBookmark::previousAddress(m_to);

    // kDebug() << "previousSibling=" << previousSibling;
    KBookmark prev = (previousSibling.isEmpty())
        ? KBookmark(QDomElement())
        : m_model->bookmarkManager()->findByAddress(previousSibling);

    KBookmark bk = KBookmark(QDomElement());
    const int pos = KBookmark::positionInParent(m_to);
    m_model->beginInsert(parentGroup, pos, pos);

    if (m_separator) {
        bk = parentGroup.createNewSeparator();

    } else if (m_group) {
        Q_ASSERT(!m_text.isEmpty());
        bk = parentGroup.createNewFolder(m_text);
        bk.internalElement().setAttribute("folded", (m_open ? "no" : "yes"));
        if (!m_iconPath.isEmpty()) {
            bk.setIcon(m_iconPath);
        }
    } else if(!m_originalBookmark.isNull()) {
        QDomElement element = m_originalBookmark.internalElement().cloneNode().toElement();
        bk = KBookmark(element);
        parentGroup.addBookmark(bk);
    } else {
        bk = parentGroup.addBookmark(m_text, m_url, m_iconPath);
    }

    // move to right position
    parentGroup.moveBookmark(bk, prev);
    if (!(text().isEmpty()) && !parentAddress.isEmpty() ) {
        // open the parent (useful if it was empty) - only for manual commands
        Q_ASSERT( parentGroup.internalElement().tagName() != "xbel" );
        parentGroup.internalElement().setAttribute("folded", "no");
    }

    Q_ASSERT(bk.address() == m_to);
    m_model->endInsert();
}

QString CreateCommand::finalAddress() const
{
    Q_ASSERT( !m_to.isEmpty() );
    return m_to;
}

void CreateCommand::undo()
{
    KBookmark bk = m_model->bookmarkManager()->findByAddress(m_to);
    Q_ASSERT(!bk.isNull() && !bk.parentGroup().isNull());

    m_model->removeBookmark(bk);
}

QString CreateCommand::affectedBookmarks() const
{
    return KBookmark::parentAddress(m_to);
}

/* -------------------------------------- */

EditCommand::EditCommand(KBookmarkModel* model, const QString & address, int col, const QString & newValue, QUndoCommand* parent)
      : QUndoCommand(parent), m_model(model), mAddress(address), mCol(col)
{
    kDebug() << address << col << newValue;
    if(mCol == 1)
    {
        const KUrl u(newValue);
        if (!(u.isEmpty() && !newValue.isEmpty())) // prevent emptied line if the currently entered url is invalid
            mNewValue = u.url(KUrl::LeaveTrailingSlash);
        else
            mNewValue = newValue;
    }
    else
        mNewValue = newValue;

    if (mCol == -1)
        setText(i18nc("(qtundo-format)", "Icon Change"));
    else if (mCol == 0)
        setText(i18nc("(qtundo-format)", "Title Change"));
    else if (mCol == 1)
        setText(i18nc("(qtundo-format)", "URL Change"));
    else if (mCol == 2)
        setText(i18nc("(qtundo-format)", "Comment Change"));
}

void EditCommand::redo()
{
    KBookmark bk = m_model->bookmarkManager()->findByAddress(mAddress);
    if(mCol==-1)
    {
        if (mOldValue.isEmpty())
            mOldValue = bk.icon();
        bk.setIcon(mNewValue);
    }
    else if(mCol==0)
    {
        if (mOldValue.isEmpty()) // only the first time, not when compressing changes in modify()
            mOldValue = bk.fullText();
        kDebug() << "mOldValue=" << mOldValue;
        bk.setFullText(mNewValue);
    }
    else if(mCol==1)
    {
        if (mOldValue.isEmpty())
            mOldValue = bk.url().prettyUrl();
        const KUrl newUrl(mNewValue);
        if (!(newUrl.isEmpty() && !mNewValue.isEmpty())) // prevent emptied line if the currently entered url is invalid
            bk.setUrl(newUrl);
    }
    else if(mCol==2)
    {
        if (mOldValue.isEmpty())
            mOldValue = bk.description();
        bk.setDescription(mNewValue);
    }
    m_model->emitDataChanged(bk);
}

void EditCommand::undo()
{
    kDebug() << "Setting old value" << mOldValue << "in bk" << mAddress << "col" << mCol;
    KBookmark bk = m_model->bookmarkManager()->findByAddress(mAddress);
    if(mCol==-1)
    {
        bk.setIcon(mOldValue);
    }
    else if(mCol==0)
    {
        bk.setFullText(mOldValue);
    }
    else if(mCol==1)
    {
        bk.setUrl(KUrl(mOldValue));
    }
    else if(mCol==2)
    {
        bk.setDescription(mOldValue);
    }
    m_model->emitDataChanged(bk);
}

void EditCommand::modify(const QString &newValue)
{
    if(mCol == 1)
    {
        const KUrl u(newValue);
        if (!(u.isEmpty() && !newValue.isEmpty())) // prevent emptied line if the currently entered url is invalid
            mNewValue = u.url(KUrl::LeaveTrailingSlash);
        else
            mNewValue = newValue;
    }
    else
        mNewValue = newValue;
}

/* -------------------------------------- */

DeleteCommand::DeleteCommand(KBookmarkModel* model, const QString &from, bool contentOnly, QUndoCommand* parent)
    : QUndoCommand(parent), m_model(model), m_from(from), m_cmd(0), m_subCmd(0), m_contentOnly(contentOnly)
{
    // NOTE - DeleteCommand needs no text, it is always embedded in a macrocommand
}

void DeleteCommand::redo()
{
    KBookmark bk = m_model->bookmarkManager()->findByAddress(m_from);
    Q_ASSERT(!bk.isNull());

    if (m_contentOnly) {
        QDomElement groupRoot = bk.internalElement();

        QDomNode n = groupRoot.firstChild();
        while (!n.isNull()) {
            QDomElement e = n.toElement();
            if (!e.isNull()) {
                // kDebug() << e.tagName();
            }
            QDomNode next = n.nextSibling();
            groupRoot.removeChild(n);
            n = next;
        }
        return;
    }

    // TODO - bug - unparsed xml is lost after undo,
    //              we must store it all therefore

//FIXME this removes the comments, that's bad!
    if (!m_cmd) {
        if (bk.isGroup()) {
            m_cmd = new CreateCommand(m_model,
                    m_from, bk.fullText(), bk.icon(),
                    bk.internalElement().attribute("folded") == "no");
            m_subCmd = deleteAll(m_model, bk.toGroup());
            m_subCmd->redo();

        } else {
            m_cmd = (bk.isSeparator())
                ? new CreateCommand(m_model, m_from)
                : new CreateCommand(m_model, m_from, bk.fullText(),
                        bk.icon(), bk.url());
        }
    }
    m_cmd->undo();
}

void DeleteCommand::undo()
{
    // kDebug() << "DeleteCommand::undo " << m_from;

    if (m_contentOnly) {
        // TODO - recover saved metadata
        return;
    }

    m_cmd->redo();

    if (m_subCmd) {
        m_subCmd->undo();
    }
}

QString DeleteCommand::affectedBookmarks() const
{
    return KBookmark::parentAddress(m_from);
}

KEBMacroCommand* DeleteCommand::deleteAll(KBookmarkModel* model, const KBookmarkGroup & parentGroup)
{
    KEBMacroCommand *cmd = new KEBMacroCommand(QString());
    QStringList lstToDelete;
    // we need to delete from the end, to avoid index shifting
    for (KBookmark bk = parentGroup.first();
            !bk.isNull(); bk = parentGroup.next(bk))
        lstToDelete.prepend(bk.address());
    for (QStringList::const_iterator it = lstToDelete.constBegin();
            it != lstToDelete.constEnd(); ++it) {
        new DeleteCommand(model, (*it), false, cmd);
    }
    return cmd;
}

/* -------------------------------------- */

MoveCommand::MoveCommand(KBookmarkModel* model, const QString &from, const QString &to, const QString &name, QUndoCommand* parent)
       : QUndoCommand(parent), m_model(model), m_from(from), m_to(to), m_cc(0), m_dc(0)
{
    setText(i18nc("(qtundo-format)", "Move %1", name));
}

void MoveCommand::redo()
{
    // kDebug() << "moving from=" << m_from << "to=" << m_to;

    KBookmark fromBk = m_model->bookmarkManager()->findByAddress( m_from );

    m_cc = new CreateCommand(m_model, m_to, fromBk, QString());
    m_cc->redo();

    m_dc = new DeleteCommand(m_model, fromBk.address());
    m_dc->redo();
}

QString MoveCommand::finalAddress() const
{
    Q_ASSERT( !m_to.isEmpty() );
    return m_to;
}

void MoveCommand::undo()
{
    m_dc->undo();
    m_cc->undo();
}

QString MoveCommand::affectedBookmarks() const
{
    return KBookmark::commonParent(KBookmark::parentAddress(m_from), KBookmark::parentAddress(m_to));
}

/* -------------------------------------- */

class SortItem {
    public:
        SortItem(const KBookmark & bk) : m_bk(bk) {}

        bool operator == (const SortItem & s) {
            return (m_bk.internalElement() == s.m_bk.internalElement()); }

        bool isNull() const {
            return m_bk.isNull(); }

        SortItem previousSibling() const {
            return m_bk.parentGroup().previous(m_bk); }

        SortItem nextSibling() const {
            return m_bk.parentGroup().next(m_bk); }

        const KBookmark& bookmark() const {
            return m_bk; }

    private:
        KBookmark m_bk;
};

class SortByName {
    public:
        static QString key(const SortItem &item) {
            return (item.bookmark().isGroup() ? "a" : "b")
                + (item.bookmark().fullText().toLower());
        }
};

/* -------------------------------------- */

SortCommand::SortCommand(KBookmarkModel* model, const QString &name, const QString &groupAddress, QUndoCommand* parent)
    : KEBMacroCommand(name, parent), m_model(model), m_groupAddress(groupAddress)
{
}

void SortCommand::redo()
{
    if (childCount() == 0) {
        KBookmarkGroup grp = m_model->bookmarkManager()->findByAddress(m_groupAddress).toGroup();
        Q_ASSERT(!grp.isNull());
        SortItem firstChild(grp.first());
        // this will call moveAfter, which will add
        // the subcommands for moving the items
        kInsertionSort<SortItem, SortByName, QString, SortCommand>
            (firstChild, (*this));

    } else {
        // don't redo for second time on addCommand(cmd)
        KEBMacroCommand::redo();
    }
}

void SortCommand::moveAfter(const SortItem &moveMe,
                            const SortItem &afterMe) {
    const QString destAddress =
        afterMe.isNull()
        // move as first child
        ? KBookmark::parentAddress(moveMe.bookmark().address()) + "/0"
        // move after "afterMe"
        : KBookmark::nextAddress(afterMe.bookmark().address());

    MoveCommand *cmd = new MoveCommand(m_model, moveMe.bookmark().address(),
                                       destAddress, QString(), this);
    cmd->redo();
}

void SortCommand::undo() {
    KEBMacroCommand::undo();
}

QString SortCommand::affectedBookmarks() const
{
    return m_groupAddress;
}

/* -------------------------------------- */
KEBMacroCommand* CmdGen::insertMimeSource(KBookmarkModel* model, const QString &cmdName, const QMimeData *data, const QString &addr)
{
    KEBMacroCommand *mcmd = new KEBMacroCommand(cmdName);
    QString currentAddress = addr;
    QDomDocument doc;
    const KBookmark::List bookmarks = KBookmark::List::fromMimeData(data, doc);
    foreach (const KBookmark &bk, bookmarks) {
        new CreateCommand(model, currentAddress, bk, QString(), mcmd);
        currentAddress = KBookmark::nextAddress(currentAddress);
    }
    return mcmd;
}


KEBMacroCommand* CmdGen::itemsMoved(KBookmarkModel* model, const QList<KBookmark> & items,
        const QString &newAddress, bool copy)
{
    Q_ASSERT(!copy); // always called for a move, never for a copy (that's what insertMimeSource is about)
    Q_UNUSED(copy); // TODO: remove

    KEBMacroCommand *mcmd = new KEBMacroCommand(copy ? i18nc("(qtundo-format)", "Copy Items")
            : i18nc("(qtundo-format)", "Move Items"));
    QString bkInsertAddr = newAddress;
    foreach (const KBookmark &bk, items) {
        new CreateCommand(model, bkInsertAddr,
                          KBookmark(bk.internalElement().cloneNode(true).toElement()),
                          bk.text(), mcmd);
        bkInsertAddr = KBookmark::nextAddress(bkInsertAddr);
    }

    // Do the copying, and get the updated addresses of the bookmarks to remove.
    mcmd->redo();
    QStringList addresses;
    foreach (const KBookmark &bk, items) {
        addresses.append(bk.address());
    }
    mcmd->undo();

    foreach (const QString &address, addresses) {
        new DeleteCommand(model, address, false, mcmd);
    }

    return mcmd;
}