/* ============================================================
 *
 * This file is a part of digiKam project
 * http://www.digikam.org
 *
 * Date        : 2006-18-12
 * Description : A list view to display digiKam Tags.
 *
 * Copyright (C) 2006-2009 by Gilles Caulier <caulier dot gilles at gmail dot com>
 * Copyright (C) 2009 by Andi Clemens <andi dot clemens at gmx dot net>
 *
 * This program is free software; you can redistribute it
 * and/or modify it under the terms of the GNU General
 * Public License as published by the Free Software Foundation;
 * either version 2, or (at your option)
 * any later version.
 *
 * 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.
 *
 * ============================================================ */

// TQt includes.

#include <tqheader.h>

// KDE includes.

#include <kpopupmenu.h>
#include <klocale.h>
#include <kurl.h>
#include <kcursor.h>
#include <kapplication.h>
#include <kiconloader.h>
#include <kmessagebox.h>
#include <tdeconfig.h>
#include <kglobalsettings.h>
#include <kdialogbase.h>

// Local includes.

#include "ddebug.h"
#include "albumiconitem.h"
#include "albumlister.h"
#include "albummanager.h"
#include "albumdb.h"
#include "album.h"
#include "albumsettings.h"
#include "imageinfo.h"
#include "navigatebarwidget.h"
#include "dragobjects.h"
#include "imageattributeswatch.h"
#include "albumthumbnailloader.h"
#include "statusprogressbar.h"
#include "talbumlistview.h"
#include "talbumlistview.moc"

// X11 includes.

extern "C"
{
#include <X11/Xlib.h>
}

namespace Digikam
{

TAlbumCheckListItem::TAlbumCheckListItem(TQListView* parent, TAlbum* album)
                   : FolderCheckListItem(parent, album->title(), TQCheckListItem::RadioButtonController)
{
    setDragEnabled(true);
    m_album = album;
    m_count = 0;

    if (m_album)
        m_album->setExtraData(listView(), this);
}

TAlbumCheckListItem::TAlbumCheckListItem(TQCheckListItem* parent, TAlbum* album)
                   : FolderCheckListItem(parent, album->title(), TQCheckListItem::CheckBox)
{
    setDragEnabled(true);
    m_album = album;
    m_count = 0;

    if (m_album)
        m_album->setExtraData(listView(), this);
}

void TAlbumCheckListItem::refresh()
{
    if (!m_album) return;

    if (AlbumSettings::instance()->getShowFolderTreeViewItemsCount() &&
        dynamic_cast<TAlbumCheckListItem*>(parent()))
    {
        if (isOpen())
            setText(0, TQString("%1 (%2)").arg(m_album->title()).arg(m_count));
        else
        {
            int countRecursive = m_count;
            AlbumIterator it(m_album);
            while ( it.current() )
            {
                TAlbumCheckListItem *item = (TAlbumCheckListItem*)it.current()->extraData(listView());
                if (item)
                    countRecursive += item->count();
                ++it;
            }
            setText(0, TQString("%1 (%2)").arg(m_album->title()).arg(countRecursive));
        }
    }
    else
    {
        setText(0, m_album->title());
    }
}

void TAlbumCheckListItem::stateChange(bool val)
{
    TQCheckListItem::stateChange(val);
    ((TAlbumListView*)listView())->stateChanged(this);
}

void TAlbumCheckListItem::setOpen(bool o)
{
    TQListViewItem::setOpen(o);
    refresh();
}

TAlbum* TAlbumCheckListItem::album() const
{
    return m_album;
}

int TAlbumCheckListItem::id() const
{
    return m_album ? m_album->id() : 0;
}

void TAlbumCheckListItem::setCount(int count)
{
    m_count = count;
    refresh();
}

int TAlbumCheckListItem::count()
{
    return m_count;
}

void TAlbumCheckListItem::setStatus(MetadataHub::TagStatus status)
{
    if (status == MetadataHub::MetadataDisjoint)
    {
        if (type() != TQCheckListItem::RadioButtonController) setTristate(true);
        setState(TQCheckListItem::NoChange);
    }
    else
    {
        if (type() != TQCheckListItem::RadioButtonController) setTristate(false);
        setOn(status.hasTag);
    }
}

// ------------------------------------------------------------------------

TAlbumListView::TAlbumListView(TQWidget* parent)
              : FolderView(parent, "TAlbumListView")
{
    addColumn(i18n("Tags"));
    header()->hide();
    setResizeMode(TQListView::LastColumn);
    setRootIsDecorated(true);

    setAcceptDrops(true);
    viewport()->setAcceptDrops(true);

    connect(AlbumManager::instance(), TQT_SIGNAL(signalTAlbumsDirty(const TQMap<int, int>&)),
            this, TQT_SLOT(slotRefresh(const TQMap<int, int>&)));
}

TAlbumListView::~TAlbumListView()
{
    saveViewState();
}

void TAlbumListView::stateChanged(TAlbumCheckListItem *item)
{
    emit signalItemStateChanged(item);
}

TQDragObject* TAlbumListView::dragObject()
{
    TAlbumCheckListItem *item = dynamic_cast<TAlbumCheckListItem*>(dragItem());
    if(!item)
        return 0;

    if(!item->parent())
        return 0;

    TagDrag *t = new TagDrag(item->id(), this);
    t->setPixmap(*item->pixmap(0));

    return t;
}

bool TAlbumListView::acceptDrop(const TQDropEvent *e) const
{
    TQPoint vp = contentsToViewport(e->pos());
    TAlbumCheckListItem *itemDrop = dynamic_cast<TAlbumCheckListItem*>(itemAt(vp));
    TAlbumCheckListItem *itemDrag = dynamic_cast<TAlbumCheckListItem*>(dragItem());

    if(TagDrag::canDecode(e) || TagListDrag::canDecode(e))
    {
        // Allow dragging at the root, to move the tag to the root
        if(!itemDrop)
            return true;

        // Dragging an item on itself makes no sense
        if(itemDrag == itemDrop)
            return false;

        // Dragging a parent on its child makes no sense
        if(itemDrag && itemDrag->album()->isAncestorOf(itemDrop->album()))
            return false;

        return true;
    }

    if (ItemDrag::canDecode(e) && itemDrop && itemDrop->album()->parent())
    {
        // Only other possibility is image items being dropped
        // And allow this only if there is a Tag to be dropped
        // on and also the Tag is not root.
        return true;
    }

    return false;
}

void TAlbumListView::contentsDropEvent(TQDropEvent *e)
{
    TQListView::contentsDropEvent(e);

    if(!acceptDrop(e))
        return;

    TQPoint vp = contentsToViewport(e->pos());
    TAlbumCheckListItem *itemDrop = dynamic_cast<TAlbumCheckListItem*>(itemAt(vp));

    if(TagDrag::canDecode(e))
    {
        TQByteArray ba = e->encodedData("digikam/tag-id");
        TQDataStream ds(ba, IO_ReadOnly);
        int tagID;
        ds >> tagID;

        AlbumManager* man = AlbumManager::instance();
        TAlbum* talbum    = man->findTAlbum(tagID);

        if(!talbum)
            return;

        if (talbum == itemDrop->album())
            return;

        KPopupMenu popMenu(this);
        popMenu.insertTitle(SmallIcon("digikam"), i18n("Tags"));
        popMenu.insertItem(SmallIcon("goto"), i18n("&Move Here"), 10);
        popMenu.insertSeparator(-1);
        popMenu.insertItem(SmallIcon("cancel"), i18n("C&ancel"), 20);
        popMenu.setMouseTracking(true);
        int id = popMenu.exec(TQCursor::pos());

        if(id == 10)
        {
            TAlbum *newParentTag = 0;

            if (!itemDrop)
            {
                // move dragItem to the root
                newParentTag = AlbumManager::instance()->findTAlbum(0);
            }
            else
            {
                // move dragItem as child of dropItem
                newParentTag = itemDrop->album();
            }

            TQString errMsg;
            if (!AlbumManager::instance()->moveTAlbum(talbum, newParentTag, errMsg))
            {
                KMessageBox::error(this, errMsg);
            }

            if(itemDrop && !itemDrop->isOpen())
                itemDrop->setOpen(true);
        }

        return;
    }

    if (ItemDrag::canDecode(e))
    {
        TAlbum *destAlbum = itemDrop->album();
        TAlbum *srcAlbum;

        KURL::List      urls;
        KURL::List      kioURLs;
        TQValueList<int> albumIDs;
        TQValueList<int> imageIDs;

        if (!ItemDrag::decode(e, urls, kioURLs, albumIDs, imageIDs))
            return;

        if (urls.isEmpty() || kioURLs.isEmpty() || albumIDs.isEmpty() || imageIDs.isEmpty())
            return;

        // all the albumids will be the same
        int albumID = albumIDs.first();
        srcAlbum    = AlbumManager::instance()->findTAlbum(albumID);
        if (!srcAlbum)
        {
            DWarning() << "Could not find source album of drag"
                       << endl;
            return;
        }

        int id = 0;
        char keys_return[32];
        XQueryKeymap(x11Display(), keys_return);
        int key_1 = XKeysymToKeycode(x11Display(), 0xFFE3);
        int key_2 = XKeysymToKeycode(x11Display(), 0xFFE4);

        if(srcAlbum == destAlbum)
        {
            // Setting the dropped image as the album thumbnail
            // If the ctrl key is pressed, when dropping the image, the
            // thumbnail is set without a popup menu
            if (((keys_return[key_1 / 8]) && (1 << (key_1 % 8))) ||
                ((keys_return[key_2 / 8]) && (1 << (key_2 % 8))))
            {
                id = 12;
            }
            else
            {
                KPopupMenu popMenu(this);
                popMenu.insertTitle(SmallIcon("digikam"), i18n("Tags"));
                popMenu.insertItem(i18n("Set as Tag Thumbnail"), 12);
                popMenu.insertSeparator(-1);
                popMenu.insertItem( SmallIcon("cancel"), i18n("C&ancel") );

                popMenu.setMouseTracking(true);
                id = popMenu.exec(TQCursor::pos());
            }

            if(id == 12)
            {
                TQString errMsg;
                AlbumManager::instance()->updateTAlbumIcon(destAlbum, TQString(),
                                                           imageIDs.first(), errMsg);
            }
            return;
        }

        // If a ctrl key is pressed while dropping the drag object,
        // the tag is assigned to the images without showing a
        // popup menu.
        if (((keys_return[key_1 / 8]) && (1 << (key_1 % 8))) ||
            ((keys_return[key_2 / 8]) && (1 << (key_2 % 8))))
        {
            id = 10;
        }
        else
        {
            KPopupMenu popMenu(this);
            popMenu.insertTitle(SmallIcon("digikam"), i18n("Tags"));
            popMenu.insertItem( SmallIcon("tag"), i18n("Assign Tag '%1' to Items")
                                .arg(destAlbum->prettyURL()), 10) ;
            popMenu.insertSeparator(-1);
            popMenu.insertItem( SmallIcon("cancel"), i18n("C&ancel") );

            popMenu.setMouseTracking(true);
            id = popMenu.exec(TQCursor::pos());
        }

        if (id == 10)
        {
            emit signalProgressBarMode(StatusProgressBar::ProgressBarMode,
                                       i18n("Assign tag to images. Please wait..."));

            AlbumLister::instance()->blockSignals(true);
            AlbumManager::instance()->albumDB()->beginTransaction();
            int i=0;
            for (TQValueList<int>::const_iterator it = imageIDs.begin();
                 it != imageIDs.end(); ++it)
            {
                // create temporary ImageInfo object
                ImageInfo info(*it);

                MetadataHub hub;
                hub.load(&info);
                hub.setTag(destAlbum, true);
                hub.write(&info, MetadataHub::PartialWrite);
                hub.write(info.filePath(), MetadataHub::FullWriteIfChanged);

                emit signalProgressValue((int)((i++/(float)imageIDs.count())*100.0));
                kapp->processEvents();
            }
            AlbumLister::instance()->blockSignals(false);
            AlbumManager::instance()->albumDB()->commitTransaction();

            ImageAttributesWatch::instance()->imagesChanged(destAlbum->id());

            emit signalProgressBarMode(StatusProgressBar::TextMode, TQString());
        }
    }
}

void TAlbumListView::refresh()
{
    TQListViewItemIterator it(this);

    while (it.current())
    {
        TAlbumCheckListItem* item = dynamic_cast<TAlbumCheckListItem*>(*it);
        if (item)
            item->refresh();
        ++it;
    }
}

void TAlbumListView::slotRefresh(const TQMap<int, int>& tagsStatMap)
{
    TQListViewItemIterator it(this);

    while (it.current())
    {
        TAlbumCheckListItem* item = dynamic_cast<TAlbumCheckListItem*>(*it);
        if (item)
        {
            if (item->album())
            {
                int id = item->id();
                TQMap<int, int>::const_iterator it2 = tagsStatMap.find(id);
                if ( it2 != tagsStatMap.end() )
                    item->setCount(it2.data());
            }
        }
        ++it;
    }

    refresh();
}

void TAlbumListView::loadViewState()
{
    TDEConfig *config = kapp->config();
    config->setGroup(name());

    int selectedItem = config->readNumEntry("LastSelectedItem", 0);

    TQValueList<int> openFolders;
    if(config->hasKey("OpenFolders"))
    {
        openFolders = config->readIntListEntry("OpenFolders");
    }

    TAlbumCheckListItem *item      = 0;
    TAlbumCheckListItem *foundItem = 0;
    TQListViewItemIterator it(this->lastItem());

    for( ; it.current(); --it)
    {
        item = dynamic_cast<TAlbumCheckListItem*>(it.current());
        if(!item)
            continue;

        // Start the album root always open
        if(openFolders.contains(item->id()) || item->id() == 0)
            setOpen(item, true);
        else
            setOpen(item, false);

        if(item->id() == selectedItem)
        {
            // Save the found selected item so that it can be made visible.
            foundItem = item;
        }
    }

    // Important note: this cannot be done inside the previous loop
    // because opening folders prevents the visibility.
    // Fixes bug #144815.
    // (Looks a bit like a bug in TQt to me ...)
    if (foundItem)
    {
        setSelected(foundItem, true);
        ensureItemVisible(foundItem);
    }
}

void TAlbumListView::saveViewState()
{
    TDEConfig *config = kapp->config();
    config->setGroup(name());

    TAlbumCheckListItem *item = dynamic_cast<TAlbumCheckListItem*>(selectedItem());
    if(item)
        config->writeEntry("LastSelectedItem", item->id());
    else
        config->writeEntry("LastSelectedItem", 0);

    TQValueList<int> openFolders;
    TQListViewItemIterator it(this);
    for( ; it.current(); ++it)
    {
        item = dynamic_cast<TAlbumCheckListItem*>(it.current());
        if(item && isOpen(item))
            openFolders.push_back(item->id());
    }
    config->writeEntry("OpenFolders", openFolders);
}

}  // NameSpace Digikam