/*
    Scan Tailor - Interactive post-processing tool for scanned pages.
    Copyright (C)  Joseph Artsimovich <joseph.artsimovich@gmail.com>

    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 3 of the License, 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.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "ThumbnailFactory.h"
#include "CompositeCacheDrivenTask.h"
#include "ThumbnailCollector.h"
#include <QGraphicsItem>
#include <QSizeF>

class ThumbnailFactory::Collector : public ThumbnailCollector
{
public:
    Collector(IntrusivePtr<ThumbnailPixmapCache> const& cache, QSizeF const& max_size);

    virtual void processThumbnail(std::unique_ptr<QGraphicsItem> thumbnail);

    virtual IntrusivePtr<ThumbnailPixmapCache> thumbnailCache();

    virtual QSizeF maxLogicalThumbSize() const;

    std::unique_ptr<QGraphicsItem> retrieveThumbnail()
    {
        return std::move(m_ptrThumbnail);
    }
private:
    IntrusivePtr<ThumbnailPixmapCache> m_ptrCache;
    QSizeF m_maxSize;
    std::unique_ptr<QGraphicsItem> m_ptrThumbnail;
};

ThumbnailFactory::ThumbnailFactory(
    IntrusivePtr<ThumbnailPixmapCache> const& pixmap_cache,
    QSizeF const& max_size, IntrusivePtr<CompositeCacheDrivenTask> const& task)
    :   m_ptrPixmapCache(pixmap_cache),
        m_maxSize(max_size),
        m_ptrTask(task)
{
}

ThumbnailFactory::~ThumbnailFactory()
{
}

std::unique_ptr<QGraphicsItem>
ThumbnailFactory::get(PageInfo const& page_info)
{
    Collector collector(m_ptrPixmapCache, m_maxSize);
    m_ptrTask->process(page_info, &collector);
    return std::move(collector.retrieveThumbnail());
}

/*======================= ThumbnailFactory::Collector ======================*/

ThumbnailFactory::Collector::Collector(
    IntrusivePtr<ThumbnailPixmapCache> const& cache, QSizeF const& max_size)
    :   m_ptrCache(cache),
        m_maxSize(max_size)
{
}

void
ThumbnailFactory::Collector::processThumbnail(
    std::unique_ptr<QGraphicsItem> thumbnail)
{
    m_ptrThumbnail = std::move(thumbnail);
}

IntrusivePtr<ThumbnailPixmapCache>
ThumbnailFactory::Collector::thumbnailCache()
{
    return m_ptrCache;
}

QSizeF
ThumbnailFactory::Collector::maxLogicalThumbSize() const
{
    return m_maxSize;
}
