/*
    Copyright (C) 2014-2021 Carl Hetherington <cth@carlh.net>

    This file is part of DCP-o-matic.

    DCP-o-matic 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.

    DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.

*/


/** @file  src/dcp_decoder.h
 *  @brief A decoder of existing DCPs.
 */


#include "atmos_metadata.h"
#include "decoder.h"
#include "font_id_allocator.h"
#include <dcp/mono_picture_asset_reader.h>
#include <dcp/stereo_picture_asset_reader.h>
#include <dcp/sound_asset_reader.h>
#include <dcp/text_asset.h>


namespace dcp {
	class Reel;
}

class DCPContent;
class Log;
struct dcp_subtitle_within_dcp_test;


class DCPDecoder : public Decoder
{
public:
	DCPDecoder (
		std::shared_ptr<const Film> film,
		std::shared_ptr<const DCPContent> content,
		bool fast,
		bool tolerant,
		std::shared_ptr<DCPDecoder> old
		);

	std::vector<std::shared_ptr<dcp::Reel>> reels () const {
		return _reels;
	}

	void set_decode_referenced (bool r);
	void set_forced_reduction (boost::optional<int> reduction);

	bool pass () override;
	void seek (dcpomatic::ContentTime t, bool accurate) override;

	std::string lazy_digest () const {
		return _lazy_digest;
	}

	dcpomatic::ContentTime position () const override;

private:
	friend struct dcp_subtitle_within_dcp_test;

	void next_reel ();
	void get_readers ();
	void pass_texts (dcpomatic::ContentTime next, dcp::Size size);
	void pass_texts (
		dcpomatic::ContentTime next,
		std::shared_ptr<dcp::TextAsset> asset,
		bool reference,
		int64_t entry_point,
		std::shared_ptr<TextDecoder> decoder,
		dcp::Size size
		);
	std::string calculate_lazy_digest (std::shared_ptr<const DCPContent>) const;

	std::shared_ptr<const DCPContent> _dcp_content;

	/** Time of next thing to return from pass relative to the start of _reel */
	dcpomatic::ContentTime _next;
	std::vector<std::shared_ptr<dcp::Reel>> _reels;

	std::vector<std::shared_ptr<dcp::Reel>>::iterator _reel;
	/** Offset of _reel from the start of the content in frames */
	int64_t _offset = 0;
	/** Reader for current mono picture asset, if applicable */
	std::shared_ptr<dcp::MonoPictureAssetReader> _mono_reader;
	/** Reader for current stereo picture asset, if applicable */
	std::shared_ptr<dcp::StereoPictureAssetReader> _stereo_reader;
	/** Reader for current sound asset, if applicable */
	std::shared_ptr<dcp::SoundAssetReader> _sound_reader;
	std::shared_ptr<dcp::AtmosAssetReader> _atmos_reader;
	boost::optional<AtmosMetadata> _atmos_metadata;

	bool _decode_referenced = false;
	boost::optional<int> _forced_reduction;

	std::string _lazy_digest;

	FontIDAllocator _font_id_allocator;
};