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	diff --git a/autotests/core/cryptohelpertest.cpp b/autotests/core/cryptohelpertest.cpp
	index 982df83..ed807d7 100644
	--- a/autotests/core/cryptohelpertest.cpp
	+++ b/autotests/core/cryptohelpertest.cpp
	@@ -1,182 +1,186 @@
	// SPDX-FileCopyrightText: 2015 Sandro Knauß <knauss@kolabsys.com>
	// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL

	#include "cryptohelpertest.h"

	#include "cryptohelper.h"

	#include <QTest>

	using namespace MimeTreeParser;

	QByteArray readMailFromFile(const QString &mailFile)
	{
	QFile file(QLatin1StringView(MAIL_DATA_DIR) + QLatin1Char('/') + mailFile);
	file.open(QIODevice::ReadOnly);
	Q_ASSERT(file.isOpen());
	return file.readAll();
	}

	void CryptoHelperTest::testPMFDEmpty()
	{
	QCOMPARE(prepareMessageForDecryption("").count(), 0);
	}

	void CryptoHelperTest::testPMFDWithNoPGPBlock()
	{
	const QByteArray text = "testblabla";
	const QList<Block> blocks = prepareMessageForDecryption(text);
	QCOMPARE(blocks.count(), 1);
	QCOMPARE(blocks[0].text(), text);
	QCOMPARE(blocks[0].type(), NoPgpBlock);
	}

	void CryptoHelperTest::testPGPBlockType()
	{
	const QString blockText = QStringLiteral("text");
	const QString preString = QStringLiteral("before\n");
	for (int i = 1; i <= PrivateKeyBlock; ++i) {
	QString name;
	switch (i) {
	case PgpMessageBlock:
	name = QStringLiteral("MESSAGE");
	break;
	case MultiPgpMessageBlock:
	name = QStringLiteral("MESSAGE PART");
	break;
	case SignatureBlock:
	name = QStringLiteral("SIGNATURE");
	break;
	case ClearsignedBlock:
	name = QStringLiteral("SIGNED MESSAGE");
	break;
	case PublicKeyBlock:
	name = QStringLiteral("PUBLIC KEY BLOCK");
	break;
	case PrivateKeyBlock:
	name = QStringLiteral("PRIVATE KEY BLOCK");
	break;
	}
	QString text = QLatin1StringView("-----BEGIN PGP ") + name + QLatin1Char('\n') + blockText;
	QList<Block> blocks = prepareMessageForDecryption(preString.toLatin1() + text.toLatin1());
	QCOMPARE(blocks.count(), 1);
	QCOMPARE(blocks[0].type(), UnknownBlock);

	text += QLatin1StringView("\n-----END PGP ") + name + QLatin1Char('\n');
	blocks = prepareMessageForDecryption(preString.toLatin1() + text.toLatin1());
	QCOMPARE(blocks.count(), 2);
	QCOMPARE(blocks[1].text(), text.toLatin1());
	QCOMPARE(blocks[1].type(), static_cast<PGPBlockType>(i));
	}
	}

	void CryptoHelperTest::testDeterminePGPBlockType()
	{
	const QString blockText = QStringLiteral("text");
	for (int i = 1; i <= PrivateKeyBlock; ++i) {
	QString name;
	switch (i) {
	case PgpMessageBlock:
	name = QStringLiteral("MESSAGE");
	break;
	case MultiPgpMessageBlock:
	name = QStringLiteral("MESSAGE PART");
	break;
	case SignatureBlock:
	name = QStringLiteral("SIGNATURE");
	break;
	case ClearsignedBlock:
	name = QStringLiteral("SIGNED MESSAGE");
	break;
	case PublicKeyBlock:
	name = QStringLiteral("PUBLIC KEY BLOCK");
	break;
	case PrivateKeyBlock:
	name = QStringLiteral("PRIVATE KEY BLOCK");
	break;
	}
	const QString text = QLatin1StringView("-----BEGIN PGP ") + name + QLatin1Char('\n') + blockText + QLatin1Char('\n');
	const Block block = Block(text.toLatin1());
	QCOMPARE(block.text(), text.toLatin1());
	QCOMPARE(block.type(), static_cast<PGPBlockType>(i));
	}
	}

	void CryptoHelperTest::testEmbededPGPBlock()
	{
	const QByteArray text = QByteArray("before\n-----BEGIN PGP MESSAGE-----\ncrypted - you see :)\n-----END PGP MESSAGE-----\nafter");
	const QList<Block> blocks = prepareMessageForDecryption(text);
	QCOMPARE(blocks.count(), 3);
	QCOMPARE(blocks[0].text(), QByteArray("before\n"));
	QCOMPARE(blocks[1].text(), QByteArray("-----BEGIN PGP MESSAGE-----\ncrypted - you see :)\n-----END PGP MESSAGE-----\n"));
	QCOMPARE(blocks[2].text(), QByteArray("after"));
	}

	void CryptoHelperTest::testClearSignedMessage()
	{
	const QByteArray text = QByteArray(
	"before\n-----BEGIN PGP SIGNED MESSAGE-----\nsigned content\n-----BEGIN PGP SIGNATURE-----\nfancy signature\n-----END PGP SIGNATURE-----\nafter");
	const QList<Block> blocks = prepareMessageForDecryption(text);
	QCOMPARE(blocks.count(), 3);
	QCOMPARE(blocks[0].text(), QByteArray("before\n"));
	QCOMPARE(blocks[1].text(),
	QByteArray("-----BEGIN PGP SIGNED MESSAGE-----\nsigned content\n-----BEGIN PGP SIGNATURE-----\nfancy signature\n-----END PGP SIGNATURE-----\n"));
	QCOMPARE(blocks[2].text(), QByteArray("after"));
	}

	void CryptoHelperTest::testMultipleBlockMessage()
	{
	const QByteArray text = QByteArray(
	"before\n-----BEGIN PGP SIGNED MESSAGE-----\nsigned content\n-----BEGIN PGP SIGNATURE-----\nfancy signature\n-----END PGP "
	"SIGNATURE-----\nafter\n-----BEGIN PGP MESSAGE-----\ncrypted - you see :)\n-----END PGP MESSAGE-----\n");
	const QList<Block> blocks = prepareMessageForDecryption(text);
	QCOMPARE(blocks.count(), 4);
	QCOMPARE(blocks[0].text(), QByteArray("before\n"));
	QCOMPARE(blocks[1].text(),
	QByteArray("-----BEGIN PGP SIGNED MESSAGE-----\nsigned content\n-----BEGIN PGP SIGNATURE-----\nfancy signature\n-----END PGP SIGNATURE-----\n"));
	QCOMPARE(blocks[2].text(), QByteArray("after\n"));
	QCOMPARE(blocks[3].text(), QByteArray("-----BEGIN PGP MESSAGE-----\ncrypted - you see :)\n-----END PGP MESSAGE-----\n"));
	}

	void CryptoHelperTest::testDecryptMessage()
	{
	auto message = KMime::Message::Ptr(new KMime::Message);
	message->setContent(readMailFromFile(QLatin1StringView("openpgp-encrypted+signed.mbox")));
	message->parse();

	bool wasEncrypted = false;
	- auto decryptedMessage = CryptoUtils::decryptMessage(message, wasEncrypted);
	+ GpgME::Protocol protocol;
	+ auto decryptedMessage = CryptoUtils::decryptMessage(message, wasEncrypted, protocol);
	QVERIFY(wasEncrypted);
	QVERIFY(decryptedMessage);
	QCOMPARE(decryptedMessage->decodedContent(), QByteArray("encrypted message text"));
	QCOMPARE(decryptedMessage->encodedContent(),
	QByteArray("From test@kolab.org Wed, 08 Sep 2010 17: 02:52 +0200\nFrom: OpenPGP Test <test@kolab.org>\nTo: test@kolab.org\nSubject: OpenPGP "
	"encrypted\nDate: Wed, 08 Sep 2010 17:02:52 +0200\nUser-Agent: KMail/4.6 pre (Linux/2.6.34-rc2-2-default; KDE/4.5.60; x86_64; ; "
	")\nMIME-Version: 1.0\nContent-Transfer-Encoding: 7Bit\nContent-Type: text/plain; charset=\"us-ascii\"\n\nencrypted message text"));
	+ QCOMPARE(protocol, GpgME::OpenPGP);
	}

	void CryptoHelperTest::testDecryptInlineMessage()
	{
	auto message = KMime::Message::Ptr(new KMime::Message);
	message->setContent(readMailFromFile(QLatin1StringView("openpgp-inline-encrypted+nonenc.mbox")));
	message->parse();

	qWarning() << message->decodedContent();

	bool wasEncrypted = false;
	- auto decryptedMessage = CryptoUtils::decryptMessage(message, wasEncrypted);
	+ GpgME::Protocol protocol;
	+ auto decryptedMessage = CryptoUtils::decryptMessage(message, wasEncrypted, protocol);
	QVERIFY(wasEncrypted);
	QVERIFY(decryptedMessage);
	QCOMPARE(decryptedMessage->decodedContent(), QByteArray("Not encrypted not signed :(\n\nsome random text\n"));
	qWarning() << decryptedMessage->encodedContent();
	QCOMPARE(decryptedMessage->encodedContent(),
	QByteArray("From test@kolab.org Wed, 25 May 2011 23: 49:40 +0100\nFrom: OpenPGP Test <test@kolab.org>\nTo: test@kolab.org\nSubject: "
	"inlinepgpencrypted + non enc text\nDate: Wed, 25 May 2011 23:49:40 +0100\nMessage-ID: "
	"<1786696.yKXrOjjflF@herrwackelpudding.localhost>\nX-KMail-Transport: GMX\nX-KMail-Fcc: 28\nX-KMail-Drafts: 7\nX-KMail-Templates: "
	"9\nUser-Agent: KMail/4.6 beta5 (Linux/2.6.34.7-0.7-desktop; KDE/4.6.41; x86_64;\n git-0269848; 2011-04-19)\nMIME-Version: "
	"1.0\nContent-Type: text/plain; charset=\"us-ascii\"\n\nNot encrypted not signed :(\n\nsome random text\n"));
	+ QCOMPARE(protocol, GpgME::OpenPGP);
	}

	QTEST_APPLESS_MAIN(CryptoHelperTest)

	#include "moc_cryptohelpertest.cpp"
	diff --git a/src/core/cryptohelper.cpp b/src/core/cryptohelper.cpp
	index c728791..9f2088f 100644
	--- a/src/core/cryptohelper.cpp
	+++ b/src/core/cryptohelper.cpp
	@@ -1,317 +1,317 @@
	// SPDX-FileCopyrightText: 2001,2002 the KPGP authors
	// SPDX-FileCopyrightText: 2015 Sandro Knauß <knauss@kolabsys.com>
	// SPDX-FileCopyrightText: 2017 Daniel Vrátil <dvratil@kde.org>
	// SPDX-License-Identifier: GPL-2.0-or-later

	#include "cryptohelper.h"

	#include "mimetreeparser_core_debug.h"

	#include <QGpgME/DecryptJob>
	#include <QGpgME/Protocol>
	#include <QGpgME/VerifyOpaqueJob>

	#include <gpgme++/context.h>
	#include <gpgme++/decryptionresult.h>
	#include <gpgme++/verificationresult.h>

	using namespace MimeTreeParser;

	PGPBlockType Block::determineType() const
	{
	const QByteArray data = text();
	if (data.startsWith("-----BEGIN PGP PUBLIC KEY BLOCK-----")) {
	return NoPgpBlock;
	} else if (data.startsWith("-----BEGIN PGP SIGNED")) {
	return ClearsignedBlock;
	} else if (data.startsWith("-----BEGIN PGP SIGNATURE")) {
	return SignatureBlock;
	} else if (data.startsWith("-----BEGIN PGP PUBLIC")) {
	return PublicKeyBlock;
	} else if (data.startsWith("-----BEGIN PGP PRIVATE") \|\| data.startsWith("-----BEGIN PGP SECRET")) {
	return PrivateKeyBlock;
	} else if (data.startsWith("-----BEGIN PGP MESSAGE")) {
	if (data.startsWith("-----BEGIN PGP MESSAGE PART")) {
	return MultiPgpMessageBlock;
	} else {
	return PgpMessageBlock;
	}
	} else if (data.startsWith("-----BEGIN PGP ARMORED FILE")) {
	return PgpMessageBlock;
	} else if (data.startsWith("-----BEGIN PGP ")) {
	return UnknownBlock;
	} else {
	return NoPgpBlock;
	}
	}

	QList<Block> MimeTreeParser::prepareMessageForDecryption(const QByteArray &msg)
	{
	PGPBlockType pgpBlock = NoPgpBlock;
	QList<Block> blocks;
	int start = -1; // start of the current PGP block
	int lastEnd = -1; // end of the last PGP block
	const int length = msg.length();

	if (msg.isEmpty()) {
	return blocks;
	}
	if (msg.startsWith("-----BEGIN PGP PUBLIC KEY BLOCK-----")) {
	return blocks;
	}

	if (msg.startsWith("-----BEGIN PGP ")) {
	start = 0;
	} else {
	start = msg.indexOf("\n-----BEGIN PGP ") + 1;
	if (start == 0) {
	blocks.append(Block(msg, NoPgpBlock));
	return blocks;
	}
	}

	while (start != -1) {
	int nextEnd;
	int nextStart;

	// is the PGP block a clearsigned block?
	if (!strncmp(msg.constData() + start + 15, "SIGNED", 6)) {
	pgpBlock = ClearsignedBlock;
	} else {
	pgpBlock = UnknownBlock;
	}

	nextEnd = msg.indexOf("\n-----END PGP ", start + 15);
	nextStart = msg.indexOf("\n-----BEGIN PGP ", start + 15);

	if (nextEnd == -1) { // Missing END PGP line
	if (lastEnd != -1) {
	blocks.append(Block(msg.mid(lastEnd + 1), UnknownBlock));
	} else {
	blocks.append(Block(msg.mid(start), UnknownBlock));
	}
	break;
	}

	if ((nextStart == -1) \|\| (nextEnd < nextStart) \|\| (pgpBlock == ClearsignedBlock)) {
	// most likely we found a PGP block (but we don't check if it's valid)

	// store the preceding non-PGP block
	if (start - lastEnd - 1 > 0) {
	blocks.append(Block(msg.mid(lastEnd + 1, start - lastEnd - 1), NoPgpBlock));
	}

	lastEnd = msg.indexOf("\n", nextEnd + 14);
	if (lastEnd == -1) {
	if (start < length) {
	blocks.append(Block(msg.mid(start)));
	}
	break;
	} else {
	blocks.append(Block(msg.mid(start, lastEnd + 1 - start)));
	if ((nextStart != -1) && (nextEnd > nextStart)) {
	nextStart = msg.indexOf("\n-----BEGIN PGP ", lastEnd + 1);
	}
	}
	}

	start = nextStart;

	if (start == -1) {
	if (lastEnd + 1 < length) {
	// rest of mail is no PGP Block
	blocks.append(Block(msg.mid(lastEnd + 1), NoPgpBlock));
	}
	break;
	} else {
	start++; // move start behind the '\n'
	}
	}

	return blocks;
	}

	Block::Block() = default;

	Block::Block(const QByteArray &m)
	: msg(m)
	{
	mType = determineType();
	}

	Block::Block(const QByteArray &m, PGPBlockType t)
	: msg(m)
	, mType(t)
	{
	}

	QByteArray MimeTreeParser::Block::text() const
	{
	return msg;
	}

	PGPBlockType Block::type() const
	{
	return mType;
	}

	namespace
	{

	bool isPGP(const KMime::Content *part, bool allowOctetStream = false)
	{
	const auto ct = static_cast<KMime::Headers::ContentType *>(part->headerByType("Content-Type"));
	return ct && (ct->isSubtype("pgp-encrypted") \|\| ct->isSubtype("encrypted") \|\| (allowOctetStream && ct->isMimeType("application/octet-stream")));
	}

	bool isSMIME(const KMime::Content *part)
	{
	const auto ct = static_cast<KMime::Headers::ContentType *>(part->headerByType("Content-Type"));
	return ct && (ct->isSubtype("pkcs7-mime") \|\| ct->isSubtype("x-pkcs7-mime"));
	}

	void copyHeader(const KMime::Headers::Base *header, KMime::Message::Ptr msg)
	{
	auto newHdr = KMime::Headers::createHeader(header->type());
	if (!newHdr) {
	newHdr = new KMime::Headers::Generic(header->type());
	}
	newHdr->from7BitString(header->as7BitString(false));
	msg->appendHeader(newHdr);
	}

	bool isContentHeader(const KMime::Headers::Base *header)
	{
	return header->is("Content-Type") \|\| header->is("Content-Transfer-Encoding") \|\| header->is("Content-Disposition");
	}

	KMime::Message::Ptr assembleMessage(const KMime::Message::Ptr &orig, const KMime::Content *newContent)
	{
	auto out = KMime::Message::Ptr::create();
	// Use the new content as message content
	out->setBody(const_cast<KMime::Content *>(newContent)->encodedBody());
	out->parse();

	// remove default explicit content headers added by KMime::Content::parse()
	QList<KMime::Headers::Base *> headers = out->headers();
	for (const auto hdr : std::as_const(headers)) {
	if (isContentHeader(hdr)) {
	out->removeHeader(hdr->type());
	}
	}

	// Copy over headers from the original message, except for CT, CTE and CD
	// headers, we want to preserve those from the new content
	headers = orig->headers();
	for (const auto hdr : std::as_const(headers)) {
	if (isContentHeader(hdr)) {
	continue;
	}

	copyHeader(hdr, out);
	}

	// Overwrite some headers by those provided by the new content
	headers = newContent->headers();
	for (const auto hdr : std::as_const(headers)) {
	if (isContentHeader(hdr)) {
	copyHeader(hdr, out);
	}
	}

	out->assemble();
	out->parse();

	return out;
	}
	}

	-KMime::Message::Ptr CryptoUtils::decryptMessage(const KMime::Message::Ptr &msg, bool &wasEncrypted)
	+KMime::Message::Ptr CryptoUtils::decryptMessage(const KMime::Message::Ptr &msg, bool &wasEncrypted, GpgME::Protocol &protoName)
	{
	- GpgME::Protocol protoName = GpgME::UnknownProtocol;
	+ protoName = GpgME::UnknownProtocol;
	bool multipart = false;
	if (msg->contentType(false) && msg->contentType(false)->isMimeType("multipart/encrypted")) {
	multipart = true;
	const auto subparts = msg->contents();
	for (auto subpart : subparts) {
	if (isPGP(subpart, true)) {
	protoName = GpgME::OpenPGP;
	break;
	} else if (isSMIME(subpart)) {
	protoName = GpgME::CMS;
	break;
	}
	}
	} else {
	if (isPGP(msg.data())) {
	protoName = GpgME::OpenPGP;
	} else if (isSMIME(msg.data())) {
	protoName = GpgME::CMS;
	} else {
	const auto blocks = prepareMessageForDecryption(msg->body());
	QByteArray content;
	for (const auto &block : blocks) {
	if (block.type() == PgpMessageBlock) {
	const auto proto = QGpgME::openpgp();
	wasEncrypted = true;
	QByteArray outData;
	auto inData = block.text();
	auto decrypt = proto->decryptJob();
	auto ctx = QGpgME::Job::context(decrypt);
	ctx->setDecryptionFlags(GpgME::Context::DecryptUnwrap);
	auto result = decrypt->exec(inData, outData);
	if (result.error()) {
	// unknown key, invalid algo, or general error
	qCWarning(MIMETREEPARSER_CORE_LOG) << "Failed to decrypt:" << result.error().asString();
	return {};
	}

	inData = outData;
	auto verify = proto->verifyOpaqueJob(true);
	auto resultVerify = verify->exec(inData, outData);
	if (resultVerify.error()) {
	qCWarning(MIMETREEPARSER_CORE_LOG) << "Failed to verify:" << resultVerify.error().asString();
	return {};
	}

	content += KMime::CRLFtoLF(outData);
	} else if (block.type() == NoPgpBlock) {
	content += block.text();
	}
	}

	KMime::Content decCt;
	decCt.setBody(content);
	decCt.parse();
	decCt.assemble();

	return assembleMessage(msg, &decCt);
	}
	}

	if (protoName == GpgME::UnknownProtocol) {
	// Not encrypted, or we don't recognize the encryption
	wasEncrypted = false;
	return {};
	}

	const auto proto = (protoName == GpgME::OpenPGP) ? QGpgME::openpgp() : QGpgME::smime();

	wasEncrypted = true;
	QByteArray outData;
	auto inData = multipart ? msg->encodedContent() : msg->decodedContent(); // decodedContent in fact returns decoded body
	auto decrypt = proto->decryptJob();
	auto result = decrypt->exec(inData, outData);
	if (result.error()) {
	// unknown key, invalid algo, or general error
	qCWarning(MIMETREEPARSER_CORE_LOG) << "Failed to decrypt:" << result.error().asString();
	return {};
	}

	KMime::Content decCt;
	decCt.setContent(KMime::CRLFtoLF(outData));
	decCt.parse();
	decCt.assemble();

	return assembleMessage(msg, &decCt);
	}
	diff --git a/src/core/cryptohelper.h b/src/core/cryptohelper.h
	index 2dfceef..99b9369 100644
	--- a/src/core/cryptohelper.h
	+++ b/src/core/cryptohelper.h
	@@ -1,55 +1,56 @@
	// SPDX-FileCopyrightText: 2001,2002 the KPGP authors
	// SPDX-FileCopyrightText: 2015 Sandro Knauß <knauss@kolabsys.com>
	// SPDX-FileCopyrightText: 2017 Daniel Vrátil <dvratil@kde.org>
	// SPDX-License-Identifier: GPL-2.0-or-later

	#pragma once

	#include "mimetreeparser_core_export.h"

	#include <KMime/Message>
	#include <QByteArray>
	#include <QList>
	+#include <gpgme++/global.h>

	namespace MimeTreeParser
	{
	enum PGPBlockType {
	UnknownBlock = -1, // BEGIN PGP ???
	NoPgpBlock = 0,
	PgpMessageBlock = 1, // BEGIN PGP MESSAGE
	MultiPgpMessageBlock = 2, // BEGIN PGP MESSAGE, PART X[/Y]
	SignatureBlock = 3, // BEGIN PGP SIGNATURE
	ClearsignedBlock = 4, // BEGIN PGP SIGNED MESSAGE
	PublicKeyBlock = 5, // BEGIN PGP PUBLIC KEY BLOCK
	PrivateKeyBlock = 6, // BEGIN PGP PRIVATE KEY BLOCK (PGP 2.x: ...SECRET...)
	};

	class MIMETREEPARSER_CORE_EXPORT Block
	{
	public:
	Block();
	Block(const QByteArray &m);

	Block(const QByteArray &m, PGPBlockType t);

	[[nodiscard]] QByteArray text() const;
	[[nodiscard]] PGPBlockType type() const;
	[[nodiscard]] PGPBlockType determineType() const;

	QByteArray msg;
	PGPBlockType mType = UnknownBlock;
	};

	/** Parses the given message and splits it into OpenPGP blocks and
	Non-OpenPGP blocks.
	*/
	[[nodiscard]] MIMETREEPARSER_CORE_EXPORT QList<Block> prepareMessageForDecryption(const QByteArray &msg);

	namespace CryptoUtils
	{
	-[[nodiscard]] MIMETREEPARSER_CORE_EXPORT KMime::Message::Ptr decryptMessage(const KMime::Message::Ptr &decrypt, bool &wasEncrypted);
	+[[nodiscard]] MIMETREEPARSER_CORE_EXPORT KMime::Message::Ptr decryptMessage(const KMime::Message::Ptr &decrypt, bool &wasEncrypted, GpgME::Protocol &protoName);
	}

	} // namespace MimeTreeParser

	Q_DECLARE_TYPEINFO(MimeTreeParser::Block, Q_MOVABLE_TYPE);
	diff --git a/src/widgets/messageviewerdialog.cpp b/src/widgets/messageviewerdialog.cpp
	index 54e73fd..165511e 100644
	--- a/src/widgets/messageviewerdialog.cpp
	+++ b/src/widgets/messageviewerdialog.cpp
	@@ -1,321 +1,332 @@
	// SPDX-FileCopyrightText: 2023 g10 Code GmbH
	// SPDX-FileContributor: Carl Schwan <carl.schwan@gnupg.com>
	// SPDX-License-Identifier: GPL-2.0-or-later

	#include "messageviewerdialog.h"

	#include "messageviewer.h"
	#include "mimetreeparser_widgets_debug.h"
	#include <MimeTreeParserCore/CryptoHelper>
	#include <MimeTreeParserCore/FileOpener>

	#include <KLocalizedString>
	#include <KMessageBox>
	#include <KMessageWidget>

	#include <QDialogButtonBox>
	#include <QFileDialog>
	#include <QMenuBar>
	#include <QPainter>
	#include <QPrintDialog>
	#include <QPrintPreviewDialog>
	#include <QPrinter>
	#include <QPushButton>
	#include <QRegularExpression>
	#include <QSaveFile>
	#include <QStandardPaths>
	#include <QStyle>
	#include <QToolBar>
	#include <QVBoxLayout>

	using namespace MimeTreeParser::Widgets;

	namespace
	{

	-/// On windows, force the filename to end with .eml
	-/// On Linux, do nothing as this is handled by the file picker
	-inline QString changeExtension(const QString &fileName)
	+inline QString changeExtension(const QString &fileName, const QString &extension)
	{
	-#ifdef Q_OS_WIN
	auto renamedFileName = fileName;
	- renamedFileName.replace(QRegularExpression(QStringLiteral("\\.(mbox\|p7m\|asc)$")), QStringLiteral(".eml"));
	+ renamedFileName.replace(QRegularExpression(QStringLiteral("\\.(mbox\|p7m\|asc)$")), extension);

	// In case the file name didn't contain any of the expected extension: mbox, p7m, asc and eml
	// or doesn't contains an extension at all.
	- if (!renamedFileName.endsWith(QStringLiteral(".eml"))) {
	- renamedFileName += QStringLiteral(".eml");
	+ if (!renamedFileName.endsWith(extension)) {
	+ renamedFileName += extension;
	}

	return renamedFileName;
	-#else
	- // Handled automatically by the file picker on linux
	- return fileName;
	-#endif
	}
	-
	}

	class MessageViewerDialog::Private
	{
	public:
	Private(MessageViewerDialog *dialog)
	: q(dialog)
	{
	}

	MessageViewerDialog *const q;
	int currentIndex = 0;
	QList<KMime::Message::Ptr> messages;
	QString fileName;
	MimeTreeParser::Widgets::MessageViewer *messageViewer = nullptr;
	QAction *nextAction = nullptr;
	QAction *previousAction = nullptr;
	QToolBar *toolBar = nullptr;

	void setCurrentIndex(int currentIndex);
	QMenuBar createMenuBar(QWidget parent);

	private:
	void save(QWidget *parent);
	void saveDecrypted(QWidget *parent);
	void print(QWidget *parent);
	void printPreview(QWidget *parent);
	void printInternal(QPrinter *printer);
	};

	void MessageViewerDialog::Private::setCurrentIndex(int index)
	{
	Q_ASSERT(index >= 0);
	Q_ASSERT(index < messages.count());

	currentIndex = index;
	messageViewer->setMessage(messages[currentIndex]);
	q->setWindowTitle(messageViewer->subject());

	previousAction->setEnabled(currentIndex != 0);
	nextAction->setEnabled(currentIndex != messages.count() - 1);
	}

	QMenuBar MessageViewerDialog::Private::createMenuBar(QWidget parent)
	{
	const auto menuBar = new QMenuBar(parent);

	// File menu
	const auto fileMenu = menuBar->addMenu(i18nc("@action:inmenu", "&File"));

	const auto saveAction = new QAction(QIcon::fromTheme(QStringLiteral("document-save")), i18nc("@action:inmenu", "&Save"));
	QObject::connect(saveAction, &QAction::triggered, parent, [parent, this] {
	save(parent);
	});
	fileMenu->addAction(saveAction);

	const auto saveDecryptedAction = new QAction(QIcon::fromTheme(QStringLiteral("document-save")), i18nc("@action:inmenu", "Save Decrypted"));
	QObject::connect(saveDecryptedAction, &QAction::triggered, parent, [parent, this] {
	saveDecrypted(parent);
	});
	fileMenu->addAction(saveDecryptedAction);

	const auto printPreviewAction = new QAction(QIcon::fromTheme(QStringLiteral("document-print-preview")), i18nc("@action:inmenu", "Print Preview"));
	QObject::connect(printPreviewAction, &QAction::triggered, parent, [parent, this] {
	printPreview(parent);
	});
	fileMenu->addAction(printPreviewAction);

	const auto printAction = new QAction(QIcon::fromTheme(QStringLiteral("document-print")), i18nc("@action:inmenu", "&Print"));
	QObject::connect(printAction, &QAction::triggered, parent, [parent, this] {
	print(parent);
	});
	fileMenu->addAction(printAction);

	// Navigation menu
	const auto navigationMenu = menuBar->addMenu(i18nc("@action:inmenu", "&Navigation"));
	previousAction = new QAction(QIcon::fromTheme(QStringLiteral("go-previous")), i18nc("@action:button Previous email", "Previous Message"), parent);
	previousAction->setEnabled(false);
	navigationMenu->addAction(previousAction);

	nextAction = new QAction(QIcon::fromTheme(QStringLiteral("go-next")), i18nc("@action:button Next email", "Next Message"), parent);
	nextAction->setEnabled(false);
	navigationMenu->addAction(nextAction);

	return menuBar;
	}

	void MessageViewerDialog::Private::save(QWidget *parent)
	{
	- const QString location = QFileDialog::getSaveFileName(parent,
	- i18nc("@title:window", "Save File"),
	- changeExtension(fileName),
	- i18nc("File dialog accepted files", "Email files (.eml .mbox)"));
	+ QString extension;
	+ QString alternatives;
	+ auto message = messages[currentIndex];
	+ bool wasEncrypted = false;
	+ GpgME::Protocol protocol;
	+ auto decryptedMessage = CryptoUtils::decryptMessage(message, wasEncrypted, protocol);
	+ Q_UNUSED(decryptedMessage); // we save the message without modifying it
	+
	+ if (wasEncrypted) {
	+ extension = QStringLiteral(".mime");
	+ if (protocol == GpgME::OpenPGP) {
	+ alternatives = i18nc("File dialog accepted files", "Email files (.eml .mbox *.mime)");
	+ } else {
	+ alternatives = i18nc("File dialog accepted files", "Encrypted S/MIME files (*.p7m)");
	+ }
	+ } else {
	+ extension = QStringLiteral(".eml");
	+ alternatives = i18nc("File dialog accepted files", "Email files (.eml .mbox *.mime)");
	+ }
	+
	+ const QString location =
	+ QFileDialog::getSaveFileName(parent, i18nc("@title:window", "Save File"), changeExtension(fileName, QStringLiteral(".mime")), alternatives);

	QSaveFile file(location);
	if (!file.open(QIODevice::WriteOnly)) {
	KMessageBox::error(parent, i18n("File %1 could not be created.", location), i18n("Error saving message"));
	return;
	}
	file.write(messages[currentIndex]->encodedContent());
	file.commit();
	}

	void MessageViewerDialog::Private::saveDecrypted(QWidget *parent)
	{
	const QString location = QFileDialog::getSaveFileName(parent,
	i18nc("@title:window", "Save Decrypted File"),
	- changeExtension(fileName),
	- i18nc("File dialog accepted files", "Email files (.eml .mbox)"));
	+ changeExtension(fileName, QStringLiteral(".eml")),
	+ i18nc("File dialog accepted files", "Email files (.eml .mbox *mime)"));

	QSaveFile file(location);
	if (!file.open(QIODevice::WriteOnly)) {
	KMessageBox::error(parent, i18nc("Error message", "File %1 could not be created.", location), i18n("Error saving message"));
	return;
	}
	auto message = messages[currentIndex];
	bool wasEncrypted = false;
	- auto decryptedMessage = CryptoUtils::decryptMessage(message, wasEncrypted);
	+ GpgME::Protocol protocol;
	+ auto decryptedMessage = CryptoUtils::decryptMessage(message, wasEncrypted, protocol);
	if (!wasEncrypted) {
	decryptedMessage = message;
	}
	file.write(decryptedMessage->encodedContent());

	file.commit();
	}

	void MessageViewerDialog::Private::print(QWidget *parent)
	{
	QPrinter printer;
	QPrintDialog dialog(&printer, parent);
	dialog.setWindowTitle(i18nc("@title:window", "Print Document"));
	if (dialog.exec() != QDialog::Accepted)
	return;

	printInternal(&printer);
	}

	void MessageViewerDialog::Private::printPreview(QWidget *parent)
	{
	auto dialog = new QPrintPreviewDialog(parent);
	dialog->setAttribute(Qt::WA_DeleteOnClose);
	dialog->resize(800, 750);
	dialog->setWindowTitle(i18nc("@title:window", "Print Document"));
	QObject::connect(dialog, &QPrintPreviewDialog::paintRequested, parent, [this](QPrinter *printer) {
	printInternal(printer);
	});
	dialog->open();
	}

	void MessageViewerDialog::Private::printInternal(QPrinter *printer)
	{
	QPainter painter;
	painter.begin(printer);
	const auto pageLayout = printer->pageLayout();
	const auto pageRect = pageLayout.paintRectPixels(printer->resolution());
	const double xscale = pageRect.width() / double(messageViewer->width());
	const double yscale = pageRect.height() / double(messageViewer->height());
	const double scale = qMin(qMin(xscale, yscale), 1.);
	painter.translate(pageRect.x(), pageRect.y());
	painter.scale(scale, scale);
	messageViewer->print(&painter, pageRect.width());
	}

	MessageViewerDialog::MessageViewerDialog(const QList<KMime::Message::Ptr> &messages, QWidget *parent)
	: QDialog(parent)
	, d(std::make_unique<Private>(this))
	{
	d->messages += messages;
	initGUI();
	}

	MessageViewerDialog::MessageViewerDialog(const QString &fileName, QWidget *parent)
	: QDialog(parent)
	, d(std::make_unique<Private>(this))
	{
	d->fileName = fileName;
	d->messages += MimeTreeParser::Core::FileOpener::openFile(fileName);
	initGUI();
	}

	void MessageViewerDialog::initGUI()
	{
	const auto mainLayout = new QVBoxLayout(this);
	mainLayout->setContentsMargins({});
	mainLayout->setSpacing(0);

	const auto layout = new QVBoxLayout;

	const auto menuBar = d->createMenuBar(this);
	mainLayout->setMenuBar(menuBar);

	if (d->messages.isEmpty()) {
	auto errorMessage = new KMessageWidget(this);
	errorMessage->setMessageType(KMessageWidget::Error);
	errorMessage->setText(i18nc("@info", "Unable to read file"));
	layout->addWidget(errorMessage);
	return;
	}

	const bool multipleMessages = d->messages.length() > 1;
	d->toolBar = new QToolBar(this);

	if (multipleMessages) {
	#ifdef Q_OS_UNIX
	d->toolBar->setToolButtonStyle(Qt::ToolButtonFollowStyle);
	#else
	// on other platforms the default is IconOnly which is bad for
	// accessibility and can't be changed by the user.
	toolBar->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
	#endif

	d->toolBar->addAction(d->previousAction);
	connect(d->previousAction, &QAction::triggered, this, [this] {
	d->setCurrentIndex(d->currentIndex - 1);
	});

	const auto spacer = new QWidget(this);
	spacer->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
	d->toolBar->addWidget(spacer);

	d->toolBar->addAction(d->nextAction);
	connect(d->nextAction, &QAction::triggered, this, [this] {
	d->setCurrentIndex(d->currentIndex + 1);
	});
	d->nextAction->setEnabled(true);

	mainLayout->addWidget(d->toolBar);
	} else {
	mainLayout->addWidget(d->toolBar);
	d->toolBar->hide();
	}

	mainLayout->addLayout(layout);

	d->messageViewer = new MimeTreeParser::Widgets::MessageViewer(this);
	d->messageViewer->setMessage(d->messages[0]);
	setWindowTitle(d->messageViewer->subject());
	layout->addWidget(d->messageViewer);

	auto buttonBox = new QDialogButtonBox(this);
	buttonBox->setContentsMargins(style()->pixelMetric(QStyle::PM_LayoutLeftMargin, nullptr, this),
	style()->pixelMetric(QStyle::PM_LayoutTopMargin, nullptr, this),
	style()->pixelMetric(QStyle::PM_LayoutRightMargin, nullptr, this),
	style()->pixelMetric(QStyle::PM_LayoutBottomMargin, nullptr, this));
	auto closeButton = buttonBox->addButton(QDialogButtonBox::Close);
	connect(closeButton, &QPushButton::pressed, this, &QDialog::accept);
	layout->addWidget(buttonBox);

	setMinimumSize(300, 300);
	resize(600, 600);
	}

	MessageViewerDialog::~MessageViewerDialog() = default;

	QToolBar *MessageViewerDialog::toolBar() const
	{
	return d->toolBar;
	}

	QList<KMime::Message::Ptr> MessageViewerDialog::messages() const
	{
	return d->messages;
	}

	#include "moc_messageviewerdialog.cpp"

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