//
// This file is part of Kepka,
// an unofficial desktop version of Telegram messaging app,
// see https://github.com/procxx/kepka
//
// Kepka 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.
//
// In addition, as a special exception, the copyright holders give permission
// to link the code of portions of this program with the OpenSSL library.
//
// Full license: https://github.com/procxx/kepka/blob/master/LICENSE
// Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
// Copyright (c) 2017- Kepka Contributors, https://github.com/procxx
//
#pragma once
#include <QImageReader>

#include "media/media_clip_implementation.h"

namespace Media {
namespace Clip {
namespace internal {

class QtGifReaderImplementation : public ReaderImplementation {
public:
	QtGifReaderImplementation(FileLocation *location, QByteArray *data);

	ReadResult readFramesTill(TimeMs frameMs, TimeMs systemMs) override;

	TimeMs frameRealTime() const override;
	TimeMs framePresentationTime() const override;

	bool renderFrame(QImage &to, bool &hasAlpha, const QSize &size) override;

	TimeMs durationMs() const override;
	bool hasAudio() const override {
		return false;
	}

	bool start(Mode mode, TimeMs &positionMs) override;

	~QtGifReaderImplementation();

private:
	bool jumpToStart();
	ReadResult readNextFrame();

	Mode _mode = Mode::Normal;

	std::unique_ptr<QImageReader> _reader;
	int _framesLeft = 0;
	TimeMs _frameRealTime = 0;
	TimeMs _frameTime = 0;
	int _frameDelay = 0;
	QImage _frame;
};

} // namespace internal
} // namespace Clip
} // namespace Media