/*
This file is part of Telegram Desktop,
an unofficial desktop messaging app, see https://telegram.org

Telegram Desktop 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.

It 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.

Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014 John Preston, https://tdesktop.com
*/
#include "stdafx.h"
#include "localimageloader.h"
#include <libexif/exif-data.h>

LocalImageLoaderPrivate::LocalImageLoaderPrivate(int32 currentUser, LocalImageLoader *loader, QThread *thread) : QObject(0)
    , loader(loader)
    , user(currentUser)
{
	moveToThread(thread);
	connect(loader, SIGNAL(needToPrepare()), this, SLOT(prepareImages()));
	connect(this, SIGNAL(imageReady()), loader, SLOT(onImageReady()));
	connect(this, SIGNAL(imageFailed(quint64)), loader, SLOT(onImageFailed(quint64)));
};

void LocalImageLoaderPrivate::prepareImages() {
	QString file, filename, mime;
    int32 filesize = 0;
	QImage img;
	QByteArray data;
	PeerId peer;
    uint64 id, jpeg_id = 0;
	ToPrepareMediaType type;
	{
		QMutexLocker lock(loader->toPrepareMutex());
		ToPrepareMedias &list(loader->toPrepareMedias());
		if (list.isEmpty()) return;

		file = list.front().file;
		img = list.front().img;
		data = list.front().data;
		peer = list.front().peer;
		id = list.front().id;
		type = list.front().type;
	}

	if (img.isNull()) {
		if (!file.isEmpty()) {
			QFileInfo info(file);
			if (type == ToPrepareAuto) {
				QString lower(file.toLower());
				const QStringList &photoExtensions(cPhotoExtensions());
				for (QStringList::const_iterator i = photoExtensions.cbegin(), e = photoExtensions.cend(); i != e; ++i) {
					if (lower.lastIndexOf(*i) == lower.size() - i->size()) {
						if (info.size() < MaxUploadPhotoSize) {
							type = ToPreparePhoto;
							break;
						}
					}
				}
				if (type == ToPrepareAuto && info.size() < MaxUploadDocumentSize) {
					type = ToPrepareDocument;
				}
			}
			if (type != ToPrepareAuto && info.size() < MaxUploadPhotoSize) {
				img = App::readImage(file);
			}
			if (type == ToPrepareDocument) {
				mime = QMimeDatabase().mimeTypeForFile(info).name();
			}
			filename = info.fileName();
			filesize = info.size();
		} else if (!data.isEmpty()) {
			img = App::readImage(data);
			if (type == ToPrepareAuto) {
				if (!img.isNull() && data.size() < MaxUploadPhotoSize) {
					type = ToPreparePhoto;
				} else if (data.size() < MaxUploadDocumentSize) {
					type = ToPrepareDocument;
				} else {
					img = QImage();
				}
			}
			QMimeType mimeType = QMimeDatabase().mimeTypeForData(data);
			if (type == ToPrepareDocument) {
				mime = mimeType.name();
			}
			filename = qsl("Document");
			QStringList patterns = mimeType.globPatterns();
			if (!patterns.isEmpty()) {
				filename = patterns.front().replace('*', filename);
			}
			filesize = data.size();
		}
	} else {
		type = ToPreparePhoto; // only photo from QImage
		filename = qsl("Untitled.jpg");
		filesize = 0;
	}

	if ((img.isNull() && (type != ToPrepareDocument || !filesize)) || type == ToPrepareAuto || (img.isNull() && file.isEmpty() && data.isEmpty())) { // if could not decide what type
		{
			QMutexLocker lock(loader->toPrepareMutex());
			ToPrepareMedias &list(loader->toPrepareMedias());
			list.pop_front();
		}

		QTimer::singleShot(1, this, SLOT(prepareImages()));

		emit imageFailed(id);
	} else {
		PreparedPhotoThumbs photoThumbs;
		QVector<MTPPhotoSize> photoSizes;

		MTPPhotoSize thumb(MTP_photoSizeEmpty(MTP_string("")));
		MTPPhoto photo(MTP_photoEmpty(MTP_long(0)));
		MTPDocument document(MTP_documentEmpty(MTP_long(0)));

		QByteArray jpeg;
		if (type == ToPreparePhoto) {
			int32 w = img.width(), h = img.height();

			QPixmap thumb = (w > 100 || h > 100) ? QPixmap::fromImage(img.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation)) : QPixmap::fromImage(img);
			photoThumbs.insert('s', thumb);
			photoSizes.push_back(MTP_photoSize(MTP_string("s"), MTP_fileLocationUnavailable(MTP_long(0), MTP_int(0), MTP_long(0)), MTP_int(thumb.width()), MTP_int(thumb.height()), MTP_int(0)));

			QPixmap full = (w > 800 || h > 800) ? QPixmap::fromImage(img.scaled(800, 800, Qt::KeepAspectRatio, Qt::SmoothTransformation)) : QPixmap::fromImage(img);
			photoThumbs.insert('x', full);
			photoSizes.push_back(MTP_photoSize(MTP_string("x"), MTP_fileLocationUnavailable(MTP_long(0), MTP_int(0), MTP_long(0)), MTP_int(full.width()), MTP_int(full.height()), MTP_int(0)));

			{
				QBuffer jpegBuffer(&jpeg);
				full.save(&jpegBuffer, "JPG", 87);
			}
			if (!filesize) filesize = jpeg.size();
		
			photo = MTP_photo(MTP_long(id), MTP_long(0), MTP_int(user), MTP_int(unixtime()), MTP_string(""), MTP_geoPointEmpty(), MTP_vector<MTPPhotoSize>(photoSizes));

			jpeg_id = id;
		} else if ((type == ToPrepareVideo || type == ToPrepareDocument) && !img.isNull()) {
			int32 w = img.width(), h = img.height();

			QPixmap full = (w > 90 || h > 90) ? QPixmap::fromImage(img.scaled(90, 90, Qt::KeepAspectRatio, Qt::SmoothTransformation)) : QPixmap::fromImage(img);

			{
				QBuffer jpegBuffer(&jpeg);
				full.save(&jpegBuffer, "JPG", 87);
			}

			photoThumbs.insert('0', full);
			thumb = MTP_photoSize(MTP_string(""), MTP_fileLocationUnavailable(MTP_long(0), MTP_int(0), MTP_long(0)), MTP_int(full.width()), MTP_int(full.height()), MTP_int(0));

			jpeg_id = MTP::nonce<uint64>();
		}

		if (type == ToPrepareDocument) {
			document = MTP_document(MTP_long(id), MTP_long(0), MTP_int(MTP::authedId()), MTP_int(unixtime()), MTP_string(filename), MTP_string(mime), MTP_int(filesize), thumb, MTP_int(MTP::maindc()));
		}

		{
			QMutexLocker lock(loader->readyMutex());
			loader->readyList().push_back(ReadyLocalMedia(type, file, filename, filesize, data, id, jpeg_id, peer, photo, photoThumbs, document, jpeg));
		}

		{
			QMutexLocker lock(loader->toPrepareMutex());
			ToPrepareMedias &list(loader->toPrepareMedias());
			list.pop_front();
		}

		QTimer::singleShot(1, this, SLOT(prepareImages()));

		emit imageReady();
	}
}

LocalImageLoaderPrivate::~LocalImageLoaderPrivate() {
	loader = 0;
}

LocalImageLoader::LocalImageLoader(QObject *parent) : QObject(parent), thread(0), priv(0) {
}

void LocalImageLoader::append(const QStringList &files, const PeerId &peer, ToPrepareMediaType t) {
	{
		QMutexLocker lock(toPrepareMutex());
		for (QStringList::const_iterator i = files.cbegin(), e = files.cend(); i != e; ++i) {
			toPrepare.push_back(ToPrepareMedia(*i, peer, t));
		}
	}
	if (!thread) {
		thread = new QThread();
		priv = new LocalImageLoaderPrivate(MTP::authedId(), this, thread);
		thread->start();
	}
	emit needToPrepare();
}

PhotoId LocalImageLoader::append(const QByteArray &img, const PeerId &peer, ToPrepareMediaType t) {
	PhotoId result = 0;
	{
		QMutexLocker lock(toPrepareMutex());
		toPrepare.push_back(ToPrepareMedia(img, peer, t));
		result = toPrepare.back().id;
	}
	if (!thread) {
		thread = new QThread();
		priv = new LocalImageLoaderPrivate(MTP::authedId(), this, thread);
		thread->start();
	}
	emit needToPrepare();
	return result;
}

PhotoId LocalImageLoader::append(const QImage &img, const PeerId &peer, ToPrepareMediaType t) {
	PhotoId result = 0;
	{
		QMutexLocker lock(toPrepareMutex());
		toPrepare.push_back(ToPrepareMedia(img, peer, t));
		result = toPrepare.back().id;
	}
	if (!thread) {
		thread = new QThread();
		priv = new LocalImageLoaderPrivate(MTP::authedId(), this, thread);
		thread->start();
	}
	emit needToPrepare();
	return result;
}

PhotoId LocalImageLoader::append(const QString &file, const PeerId &peer, ToPrepareMediaType t) {
	PhotoId result = 0;
	{
		QMutexLocker lock(toPrepareMutex());
		toPrepare.push_back(ToPrepareMedia(file, peer, t));
		result = toPrepare.back().id;
	}
	if (!thread) {
		thread = new QThread();
		priv = new LocalImageLoaderPrivate(MTP::authedId(), this, thread);
		thread->start();
	}
	emit needToPrepare();
	return result;
}

void LocalImageLoader::onImageReady() {
	{
		QMutexLocker lock(toPrepareMutex());
		if (toPrepare.isEmpty()) {
			if (priv) priv->deleteLater();
			priv = 0;
			if (thread) thread->deleteLater();
			thread = 0;
		}
	}

	emit imageReady();
}

void LocalImageLoader::onImageFailed(quint64 id) {
	{
		QMutexLocker lock(toPrepareMutex());
		if (toPrepare.isEmpty()) {
			if (priv) priv->deleteLater();
			priv = 0;
			if (thread) thread->deleteLater();
			thread = 0;
		}
	}

	emit imageFailed(id);
}

QMutex *LocalImageLoader::readyMutex() {
	return &readyLock;
}

ReadyLocalMedias &LocalImageLoader::readyList() {
	return ready;
}

QMutex *LocalImageLoader::toPrepareMutex() {
	return &toPrepareLock;
}

ToPrepareMedias &LocalImageLoader::toPrepareMedias() {
	return toPrepare;
}

LocalImageLoader::~LocalImageLoader() {
	delete priv;
	delete thread;
}