/* ============================================================
 *
 * This file is a part of digiKam project
 * http://www.digikam.org
 *
 * Date        : 2005-05-06
 * Description : implementation of folder view.
 *
 * Copyright (C) 2005-2006 by Joern Ahrens <joern.ahrens@kdemail.net>
 * 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 <tqpixmap.h>
#include <tqstyle.h>
#include <tqvaluelist.h>

// KDE includes.

#include <tdeapplication.h>
#include <tdeconfig.h>
#include <kcursor.h>
#include <tdeglobalsettings.h>

// Local includes.

#include "albummanager.h"
#include "albumsettings.h"
#include "albumthumbnailloader.h"
#include "ddebug.h"
#include "dragobjects.h"
#include "folderitem.h"
#include "themeengine.h"
#include "folderview.h"
#include "folderview.moc"

namespace Digikam
{

class FolderViewPriv
{
public:

    FolderViewPriv()
    {
        active           = false;
        dragItem         = 0;
        oldHighlightItem = 0;
    }

    bool           active;

    int            itemHeight;

    TQPixmap        itemRegPix;
    TQPixmap        itemSelPix;

    TQPoint         dragStartPos;

    TQListViewItem *dragItem;
    TQListViewItem *oldHighlightItem;
};

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

FolderView::FolderView(TQWidget *parent, const char *name)
          : TQListView(parent, name)
{

    d = new FolderViewPriv;

    connect(ThemeEngine::instance(), TQ_SIGNAL(signalThemeChanged()),
            this, TQ_SLOT(slotThemeChanged()));

    connect(AlbumManager::instance(), TQ_SIGNAL(signalAllAlbumsLoaded()),
            this, TQ_SLOT(slotAllAlbumsLoaded()));

    connect(AlbumThumbnailLoader::instance(), TQ_SIGNAL(signalReloadThumbnails()),
            this, TQ_SLOT(slotIconSizeChanged()));

    setColumnAlignment(0, TQt::AlignLeft|TQt::AlignVCenter);
    setShowSortIndicator(true);
    fontChange(font());
}

FolderView::~FolderView()
{
    delete d;
}

void FolderView::setActive(bool val)
{
    d->active = val;

    if (d->active)
        slotSelectionChanged();
}

bool FolderView::active() const
{
    return d->active;
}

int FolderView::itemHeight() const
{
    return d->itemHeight;
}

TQRect FolderView::itemRect(TQListViewItem *item) const
{
    if(!item)
        return TQRect();

    TQRect r = TQListView::itemRect(item);
    r.setLeft(r.left()+(item->depth()+(rootIsDecorated() ? 1 : 0))*treeStepSize());
    return r;
}

TQPixmap FolderView::itemBasePixmapRegular() const
{
    return d->itemRegPix;
}

TQPixmap FolderView::itemBasePixmapSelected() const
{
    return d->itemSelPix;
}

void FolderView::resizeEvent(TQResizeEvent* e)
{
    TQListView::resizeEvent(e);

    int w = frameRect().width();
    int h = itemHeight();
    if (d->itemRegPix.width() != w ||
        d->itemRegPix.height() != h)
    {
        slotThemeChanged();
    }
}

void FolderView::fontChange(const TQFont& oldFont)
{
    // this is bad, since the settings value might not always be the _real_ height of the thumbnail.
    // (e.g. when it is blended, as for the tags)
    d->itemHeight = TQMAX(AlbumThumbnailLoader::instance()->thumbnailSize() + 2*itemMargin(), fontMetrics().height());
    TQListView::fontChange(oldFont);
    slotThemeChanged();
}

void FolderView::slotIconSizeChanged()
{
    d->itemHeight = TQMAX(AlbumThumbnailLoader::instance()->thumbnailSize() + 2*itemMargin(), fontMetrics().height());
    slotThemeChanged();
}

void FolderView::contentsMouseMoveEvent(TQMouseEvent *e)
{
    TQListView::contentsMouseMoveEvent(e);

    if(e->state() == NoButton)
    {
        if(TDEGlobalSettings::changeCursorOverIcon())
        {
            TQPoint vp = contentsToViewport(e->pos());
            TQListViewItem *item = itemAt(vp);
            if (mouseInItemRect(item, vp.x()))
                setCursor(KCursor::handCursor());
            else
                unsetCursor();
        }
        return;
    }

    if(d->dragItem &&
       (d->dragStartPos - e->pos()).manhattanLength() > TQApplication::startDragDistance())
    {
        TQPoint vp = contentsToViewport(e->pos());
        TQListViewItem *item = itemAt(vp);
        if(!item)
        {
            d->dragItem = 0;
            return;
        }
    }
}

void FolderView::contentsMousePressEvent(TQMouseEvent *e)
{
    TQPoint vp           = contentsToViewport(e->pos());
    TQListViewItem *item = itemAt(vp);

    // With Check Box item, we will toggle on/off item using middle mouse button.
    // See B.K.O #130906
    FolderCheckListItem *citem = dynamic_cast<FolderCheckListItem*>(item);
    if(citem && e->button() == MidButton && mouseInItemRect(item, e->pos().x()))
    {
        TQListView::contentsMousePressEvent(e);
        citem->setOn(!citem->isOn());
        return;
    }

    TQListView::contentsMousePressEvent(e);

    if(item && e->button() == LeftButton)
    {
        // Prepare D&D if necessary
        d->dragStartPos = e->pos();
        d->dragItem     = item;
        return;
    }
}

void FolderView::contentsMouseReleaseEvent(TQMouseEvent *e)
{
    TQPoint vp           = contentsToViewport(e->pos());
    TQListViewItem *item = itemAt(vp);

    TQListView::contentsMouseReleaseEvent(e);

    if(item && e->button() == LeftButton)
    {
        // See B.K.O #126871: collapse/expand treeview using left mouse button single click.
        if (mouseInItemRect(item, e->pos().x()))
            item->setOpen(!item->isOpen());
    }

    d->dragItem = 0;
}

void FolderView::startDrag()
{
    TQDragObject *o = dragObject();
    if(o)
        o->drag();
}

TQListViewItem* FolderView::dragItem() const
{
    return d->dragItem;
}

void FolderView::contentsDragEnterEvent(TQDragEnterEvent *e)
{
    TQListView::contentsDragEnterEvent(e);

    e->accept(acceptDrop(e));
}

void FolderView::contentsDragLeaveEvent(TQDragLeaveEvent * e)
{
    TQListView::contentsDragLeaveEvent(e);

    if(d->oldHighlightItem)
    {
        FolderItem *fitem = dynamic_cast<FolderItem*>(d->oldHighlightItem);
        if (fitem)
            fitem->setFocus(false);
        else
        {
            FolderCheckListItem *citem = dynamic_cast<FolderCheckListItem*>(d->oldHighlightItem);
            if (citem)
                citem->setFocus(false);
        }
        d->oldHighlightItem->repaint();
        d->oldHighlightItem = 0;
    }
}

void FolderView::contentsDragMoveEvent(TQDragMoveEvent *e)
{
    TQListView::contentsDragMoveEvent(e);

    TQPoint vp           = contentsToViewport(e->pos());
    TQListViewItem *item = itemAt(vp);
    if(item)
    {
        if(d->oldHighlightItem)
        {
            FolderItem *fitem = dynamic_cast<FolderItem*>(d->oldHighlightItem);
            if (fitem)
                fitem->setFocus(false);
            else
            {
                FolderCheckListItem *citem = dynamic_cast<FolderCheckListItem*>(d->oldHighlightItem);
                if (citem)
                    citem->setFocus(false);
            }
            d->oldHighlightItem->repaint();
        }

        FolderItem *fitem = dynamic_cast<FolderItem*>(item);
        if (fitem)
            fitem->setFocus(true);
        else
        {
            FolderCheckListItem *citem = dynamic_cast<FolderCheckListItem*>(item);
            if (citem)
                citem->setFocus(true);
        }
        d->oldHighlightItem = item;
        item->repaint();
    }
    e->accept(acceptDrop(e));
}

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

    if(d->oldHighlightItem)
    {
        FolderItem *fitem = dynamic_cast<FolderItem*>(d->oldHighlightItem);
        if (fitem)
            fitem->setFocus(false);
        else
        {
            FolderCheckListItem *citem = dynamic_cast<FolderCheckListItem*>(d->oldHighlightItem);
            if (citem)
                citem->setFocus(false);
        }
        d->oldHighlightItem->repaint();
        d->oldHighlightItem = 0;
    }
}

bool FolderView::acceptDrop(const TQDropEvent *) const
{
    return false;
}

bool FolderView::mouseInItemRect(TQListViewItem* item, int x) const
{
    if (!item)
        return false;

    x += contentsX();

    int offset = treeStepSize()*(item->depth() + (rootIsDecorated() ? 1 : 0));
    offset    += itemMargin();
    int width  = item->width(fontMetrics(), this, 0);

    int boxsize = 0;
    FolderCheckListItem* citem = dynamic_cast<FolderCheckListItem*>(item);
    if (citem &&
        ((citem->type() == TQCheckListItem::CheckBox) || (citem->type() == TQCheckListItem::CheckBoxController)))
        boxsize = style().pixelMetric(TQStyle::PM_CheckListButtonSize, this);

    return (x > (offset + boxsize) && x < (offset + boxsize + width));
}

void FolderView::slotThemeChanged()
{
    int w = frameRect().width();
    int h = itemHeight();

    d->itemRegPix = ThemeEngine::instance()->listRegPixmap(w, h);
    d->itemSelPix = ThemeEngine::instance()->listSelPixmap(w, h);

    viewport()->update();
}

void FolderView::slotAllAlbumsLoaded()
{
    disconnect(AlbumManager::instance(), TQ_SIGNAL(signalAllAlbumsLoaded()),
               this, TQ_SLOT(slotAllAlbumsLoaded()));
    loadViewState();
}

void FolderView::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");
    }

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

    for( ; it.current(); --it)
    {
        item = dynamic_cast<FolderItem*>(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 FolderView::saveViewState()
{
    TDEConfig *config = kapp->config();
    config->setGroup(name());

    FolderItem *item = dynamic_cast<FolderItem*>(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<FolderItem*>(it.current());
        if(item && isOpen(item))
            openFolders.push_back(item->id());
    }
    config->writeEntry("OpenFolders", openFolders);
}

void FolderView::slotSelectionChanged()
{
    TQListView::selectionChanged();
}

void FolderView::selectItem(int)
{
}

void FolderView::collapseView(CollapseMode mode)
{
    // collapse the whole list first
    TQListViewItemIterator iter(this);
    while (iter.current())
    {
        iter.current()->setOpen(false);
        iter.current()->setVisible(true);
        iter++;
    }

    // handle special cases
    switch (mode)
    {
        case OmitRoot:
        {
            firstChild()->setOpen(true);
            break;
        }
        case RestoreCurrentAlbum:
        {
            TQListViewItemIterator iter(this);
            FolderItem* restoredItem = 0;

            while (iter.current())
            {
                FolderItem* curItem = dynamic_cast<FolderItem*>(iter.current());

                if (curItem)
                {
                    if (curItem->id() == AlbumManager::instance()->currentAlbum()->id())
                    {
                        curItem->setOpen(true);
                        restoredItem = curItem;
                        break;
                    }
                }
                iter++;
            }
            if (restoredItem)
                ensureItemVisible(restoredItem);
            break;
        }
        default:
            break;
    }
}

}  // namespace Digikam
