/*
Gwenview: an image viewer
Copyright 2007 Aurélien Gâteau <aurelien.gateau@free.fr>

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
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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

*/
#include "jpegcontenttest.moc"
#include <iostream>

// Qt
#include <QDir>
#include <QFile>
#include <QImage>
#include <QString>

// KDE
#include <qtest_kde.h>
#include <kdebug.h>
#include <kfilemetainfo.h>

// Local
#include "../lib/orientation.h"
#include "../lib/jpegcontent.h"
#include "testutils.h"

using namespace std;

const char* ORIENT6_FILE="orient6.jpg";
const char* ORIENT1_VFLIP_FILE="orient1_vflip.jpg";
const char* CUT_FILE="cut.jpg";
const char* TMP_FILE="tmp.jpg";
const char* THUMBNAIL_FILE="test_thumbnail.jpg";

const int ORIENT6_WIDTH=128;  // This size is the size *after* orientation
const int ORIENT6_HEIGHT=256; // has been applied
const QString ORIENT6_COMMENT="a comment";


QTEST_KDEMAIN(JpegContentTest, GUI)


void JpegContentTest::initTestCase() {
	bool result;
	QFile in(pathForTestFile(ORIENT6_FILE));
	result=in.open(QIODevice::ReadOnly);
	QVERIFY(result);
	
	QFileInfo info(in);
	int size=info.size()/2;
	
	char* data=new char[size];
	int readSize=in.read(data, size);
	QCOMPARE(size,readSize);
	
	QFile out(CUT_FILE);
	result=out.open(QIODevice::WriteOnly);
	QVERIFY(result);
	
	int wroteSize=out.write(data, size);
	QCOMPARE(size,wroteSize);
	delete []data;
}

void JpegContentTest::cleanupTestCase() {
	QDir::current().remove(CUT_FILE);
}


typedef QMap<QString,QString> MetaInfoMap;

MetaInfoMap getMetaInfo(const QString& path) {
	KFileMetaInfo fmi(path);
	QStringList list=fmi.supportedKeys();
	QStringList::ConstIterator it=list.begin();
	MetaInfoMap map;
	
	for ( ; it!=list.end(); ++it) {
		KFileMetaInfoItem item=fmi.item(*it);
		map[*it]=item.value().toString();
	}

	return map;
}

void compareMetaInfo(const QString& path1, const QString& path2, const QStringList& ignoredKeys) {
	MetaInfoMap mim1=getMetaInfo(path1);
	MetaInfoMap mim2=getMetaInfo(path2);

	QCOMPARE(mim1.keys(),mim2.keys());
	QList<QString> keys=mim1.keys();
	QList<QString>::ConstIterator it=keys.begin();
	for ( ; it!=keys.end(); ++it) {
		QString key=*it;
		if (ignoredKeys.contains(key)) continue;

		QString msg =
			QString("Meta info differs for key '%1': v1=%2 v2=%3")
				.arg(key)
				.arg(mim1[key])
				.arg(mim2[key]);

		QVERIFY2(mim1[key] == mim2[key], msg.toUtf8());
	}
}


void JpegContentTest::testResetOrientation() {
	Gwenview::JpegContent content;
	bool result;

	// Test resetOrientation without transform
	result=content.load(pathForTestFile(ORIENT6_FILE));
	QVERIFY(result);

	content.resetOrientation();

	result=content.save(TMP_FILE);
	QVERIFY(result);

	result=content.load(TMP_FILE);
	QVERIFY(result);
	QCOMPARE(content.orientation(), Gwenview::NORMAL);

	// Test resetOrientation with transform
	result=content.load(pathForTestFile(ORIENT6_FILE));
	QVERIFY(result);

	content.resetOrientation();
	content.transform(Gwenview::ROT_90);

	result=content.save(TMP_FILE);
	QVERIFY(result);

	result=content.load(TMP_FILE);
	QVERIFY(result);
	QCOMPARE(content.orientation(), Gwenview::NORMAL);
}


/**
 * This function tests JpegContent::transform() by applying a ROT_90
 * transformation, saving, reloading and applying a ROT_270 to undo the ROT_90.
 * Saving and reloading are necessary because lossless transformation only
 * happens in JpegContent::save()
 */
void JpegContentTest::testTransform() {
	bool result;
	QImage finalImage, expectedImage;

	Gwenview::JpegContent content;
	result = content.load(pathForTestFile(ORIENT6_FILE));
	QVERIFY(result);

	content.transform(Gwenview::ROT_90);
	result = content.save(TMP_FILE);
	QVERIFY(result);

	result = content.load(TMP_FILE);
	QVERIFY(result);
	content.transform(Gwenview::ROT_270);
	result = content.save(TMP_FILE);
	QVERIFY(result);

	result = finalImage.load(TMP_FILE);
	QVERIFY(result);

	result = expectedImage.load(pathForTestFile(ORIENT6_FILE));
	QVERIFY(result);

	QCOMPARE(finalImage , expectedImage);
}


void JpegContentTest::testSetComment() {
	QString comment = "test comment";
	Gwenview::JpegContent content;
	bool result;
	result = content.load(pathForTestFile(ORIENT6_FILE));
	QVERIFY(result);

	content.setComment(comment);
	QCOMPARE(content.comment() , comment);
	result = content.save(TMP_FILE);
	QVERIFY(result);

	result = content.load(TMP_FILE);
	QVERIFY(result);
	QCOMPARE(content.comment() , comment);
}


void JpegContentTest::testReadInfo() {
	Gwenview::JpegContent content;
	bool result=content.load(pathForTestFile(ORIENT6_FILE));
	QVERIFY(result);
	QCOMPARE(int(content.orientation()), 6);
	QCOMPARE(content.comment() , ORIENT6_COMMENT);
	QCOMPARE(content.size() , QSize(ORIENT6_WIDTH, ORIENT6_HEIGHT));
}

void JpegContentTest::testThumbnail() {
	Gwenview::JpegContent content;
	bool result=content.load(pathForTestFile(ORIENT6_FILE));
	QVERIFY(result);
	QImage thumbnail=content.thumbnail();
	result=thumbnail.save(THUMBNAIL_FILE, "JPEG");
	QVERIFY(result);
}

void JpegContentTest::testMultipleRotations() {
	// Test that rotating a file a lot of times does not cause findJxform() to fail
	Gwenview::JpegContent content;
	bool result=content.load(pathForTestFile(ORIENT6_FILE));
	QVERIFY(result);
	result = content.load(pathForTestFile(ORIENT6_FILE));
	QVERIFY(result);

	// 12*4 + 1 is the same as 1, since rotating four times brings you back
	for(int loop=0; loop< 12*4 + 1; ++loop) {
		content.transform(Gwenview::ROT_90);
	}
	result = content.save(TMP_FILE);
	QVERIFY(result);

	result = content.load(TMP_FILE);
	QVERIFY(result);

	QCOMPARE(content.size() , QSize(ORIENT6_HEIGHT, ORIENT6_WIDTH));
	
	
	// Check the other meta info are still here
	QStringList ignoredKeys;
	ignoredKeys << "Orientation" << "Comment";
	compareMetaInfo(pathForTestFile(ORIENT6_FILE), pathForTestFile(ORIENT1_VFLIP_FILE), ignoredKeys);
}

void JpegContentTest::testLoadTruncated() {
	// Test that loading and manipulating a truncated file does not crash
	Gwenview::JpegContent content;
	bool result=content.load(CUT_FILE);
	QVERIFY(result);
	QCOMPARE(int(content.orientation()), 6);
	QCOMPARE(content.comment() , ORIENT6_COMMENT);
	content.transform(Gwenview::VFLIP);
	kWarning() << "# Next function should output errors about incomplete image" ;
	content.save(TMP_FILE);
	kWarning() << "#" ;
}

void JpegContentTest::testRawData() {
	Gwenview::JpegContent content;
	bool result=content.load(pathForTestFile(ORIENT6_FILE));
	QVERIFY(result);

	QByteArray fileData;
	QFile file(pathForTestFile(ORIENT6_FILE));
	result = file.open(QIODevice::ReadOnly);
	QVERIFY(result);
	fileData = file.readAll();

	QCOMPARE(content.rawData(), fileData);
}
