/*
    Scan Tailor - Interactive post-processing tool for scanned pages.
    Copyright (C) 2015  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 "Filter.h"
#include "FilterUiInterface.h"
#include "OptionsWidget.h"
#include "Settings.h"
#include "Task.h"
#include "CacheDrivenTask.h"
#include "OrthogonalRotation.h"
#include "PageId.h"
#include "ImageId.h"
#include "ProjectReader.h"
#include "ProjectWriter.h"
#include "XmlMarshaller.h"
#include "XmlUnmarshaller.h"
#include <QString>
#include <QObject>
#include <QCoreApplication>
#include <QDomDocument>
#include <QDomElement>
#include <QDomNode>
#include <iostream>
#include "CommandLine.h"

namespace fix_orientation
{

Filter::Filter(
	PageSelectionAccessor const& page_selection_accessor)
:	m_ptrSettings(new Settings)
{
	if (CommandLine::get().isGui()) {
		m_ptrOptionsWidget.reset(
			new OptionsWidget(m_ptrSettings, page_selection_accessor)
		);
	}
}

Filter::~Filter()
{
}

QString
Filter::getName() const
{
	return QCoreApplication::translate(
		"fix_orientation::Filter", "Fix Orientation"
	);
}

PageView
Filter::getView() const
{
	return IMAGE_VIEW;
}

void
Filter::performRelinking(AbstractRelinker const& relinker)
{
	m_ptrSettings->performRelinking(relinker);
}

void
Filter::preUpdateUI(FilterUiInterface* ui, PageId const& page_id)
{
	if (m_ptrOptionsWidget.get()) {
		OrthogonalRotation const rotation(
			m_ptrSettings->getRotationFor(page_id.imageId())
		);
		m_ptrOptionsWidget->preUpdateUI(page_id, rotation);
		ui->setOptionsWidget(m_ptrOptionsWidget.get(), ui->KEEP_OWNERSHIP);
	}
}

QDomElement
Filter::saveSettings(
	ProjectWriter const& writer, QDomDocument& doc) const
{
	QDomElement filter_el(doc.createElement("fix-orientation"));

	writer.enumImages([this, &doc, &filter_el](ImageId const& image_id, int numeric_id) {
		writeImageSettings(doc, filter_el, image_id, numeric_id);
	});
	
	return filter_el;
}

void
Filter::loadSettings(ProjectReader const& reader, QDomElement const& filters_el)
{
	m_ptrSettings->clear();
	
	QDomElement filter_el(filters_el.namedItem("fix-orientation").toElement());
	
	QString const image_tag_name("image");
	QDomNode node(filter_el.firstChild());
	for (; !node.isNull(); node = node.nextSibling()) {
		if (!node.isElement()) {
			continue;
		}
		if (node.nodeName() != image_tag_name) {
			continue;
		}
		QDomElement el(node.toElement());
		
		bool ok = true;
		int const id = el.attribute("id").toInt(&ok);
		if (!ok) {
			continue;
		}
		
		ImageId const image_id(reader.imageId(id));
		if (image_id.isNull()) {
			continue;
		}
		
		OrthogonalRotation const rotation(el.namedItem("rotation").toElement());
		m_ptrSettings->applyRotation(image_id, rotation);
	}
}

IntrusivePtr<Task>
Filter::createTask(
	PageId const& page_id,
	IntrusivePtr<page_split::Task> const& next_task,
	bool const batch_processing)
{
	return IntrusivePtr<Task>(
		new Task(
			page_id.imageId(), IntrusivePtr<Filter>(this),
			m_ptrSettings, next_task, batch_processing
		)
	);
}

IntrusivePtr<CacheDrivenTask>
Filter::createCacheDrivenTask(
	IntrusivePtr<page_split::CacheDrivenTask> const& next_task)
{
	return IntrusivePtr<CacheDrivenTask>(
		new CacheDrivenTask(m_ptrSettings, next_task)
	);
}

void
Filter::writeImageSettings(
	QDomDocument& doc, QDomElement& filter_el,
	ImageId const& image_id, int const numeric_id) const
{
	OrthogonalRotation const rotation(m_ptrSettings->getRotationFor(image_id));
	if (rotation.toDegrees() == 0) {
		return;
	}
	
	XmlMarshaller marshaller(doc);
	
	QDomElement image_el(doc.createElement("image"));
	image_el.setAttribute("id", numeric_id);
	image_el.appendChild(rotation.toXml(doc, "rotation"));
	filter_el.appendChild(image_el);
}

} // namespace fix_orientation
