/*
    Copyright (C) 2014-2020 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/>.

*/

#include "dcp_examiner.h"
#include "dcp_content.h"
#include "exceptions.h"
#include "image.h"
#include "config.h"
#include "util.h"
#include <dcp/dcp.h>
#include <dcp/decrypted_kdm.h>
#include <dcp/cpl.h>
#include <dcp/reel.h>
#include <dcp/reel_picture_asset.h>
#include <dcp/reel_sound_asset.h>
#include <dcp/mono_picture_asset.h>
#include <dcp/mono_picture_asset_reader.h>
#include <dcp/mono_picture_frame.h>
#include <dcp/stereo_picture_asset.h>
#include <dcp/stereo_picture_asset_reader.h>
#include <dcp/stereo_picture_frame.h>
#include <dcp/sound_asset.h>
#include <dcp/sound_asset_reader.h>
#include <dcp/subtitle_asset.h>
#include <dcp/reel_atmos_asset.h>
#include <dcp/reel_subtitle_asset.h>
#include <dcp/reel_closed_caption_asset.h>
#include <dcp/reel_markers_asset.h>
#include <dcp/sound_asset.h>
#include <iostream>

#include "i18n.h"

using std::list;
using std::cout;
using std::runtime_error;
using std::map;
using std::shared_ptr;
using std::string;
using std::dynamic_pointer_cast;
using boost::optional;


DCPExaminer::DCPExaminer (shared_ptr<const DCPContent> content, bool tolerant)
	: DCP (content, tolerant)
{
	shared_ptr<dcp::CPL> cpl;

	for (int i = 0; i < static_cast<int>(TextType::COUNT); ++i) {
		_text_count[i] = 0;
	}

	if (content->cpl ()) {
		/* Use the CPL that the content was using before */
		for (auto i: cpls()) {
			if (i->id() == content->cpl().get()) {
				cpl = i;
			}
		}
	} else {
		/* Choose the CPL with the fewest unsatisfied references */

		int least_unsatisfied = INT_MAX;

		for (auto i: cpls()) {
			int unsatisfied = 0;
			for (auto j: i->reels()) {
				if (j->main_picture() && !j->main_picture()->asset_ref().resolved()) {
					++unsatisfied;
				}
				if (j->main_sound() && !j->main_sound()->asset_ref().resolved()) {
					++unsatisfied;
				}
				if (j->main_subtitle() && !j->main_subtitle()->asset_ref().resolved()) {
					++unsatisfied;
				}
				if (j->atmos() && !j->atmos()->asset_ref().resolved()) {
					++unsatisfied;
				}
			}

			if (unsatisfied < least_unsatisfied) {
				least_unsatisfied = unsatisfied;
				cpl = i;
			}
		}
	}

	if (!cpl) {
		throw DCPError ("No CPLs found in DCP");
	}

	_cpl = cpl->id ();
	_name = cpl->content_title_text ();
	_content_kind = cpl->content_kind ();

	auto try_to_parse_language = [](optional<string> lang) -> boost::optional<dcp::LanguageTag> {
		try {
			if (lang) {
				return dcp::LanguageTag (*lang);
			}
		} catch (...) {}
		return boost::none;
	};

	for (auto i: cpl->reels()) {

		if (i->main_picture ()) {
			if (!i->main_picture()->asset_ref().resolved()) {
				/* We are missing this asset so we can't continue; examination will be repeated later */
				_needs_assets = true;
				return;
			}

			auto const frac = i->main_picture()->edit_rate ();
			float const fr = float(frac.numerator) / frac.denominator;
			if (!_video_frame_rate) {
				_video_frame_rate = fr;
			} else if (_video_frame_rate.get() != fr) {
				throw DCPError (_("Mismatched frame rates in DCP"));
			}

			_has_video = true;
			auto asset = i->main_picture()->asset();
			if (!_video_size) {
				_video_size = asset->size ();
			} else if (_video_size.get() != asset->size ()) {
				throw DCPError (_("Mismatched video sizes in DCP"));
			}

			_video_length += i->main_picture()->actual_duration();
		}

		if (i->main_sound ()) {
			if (!i->main_sound()->asset_ref().resolved()) {
				/* We are missing this asset so we can't continue; examination will be repeated later */
				_needs_assets = true;
				return;
			}

			_has_audio = true;
			auto asset = i->main_sound()->asset();

			if (!_audio_channels) {
				_audio_channels = asset->channels ();
			} else if (_audio_channels.get() != asset->channels ()) {
				throw DCPError (_("Mismatched audio channel counts in DCP"));
			}

			if (!_audio_frame_rate) {
				_audio_frame_rate = asset->sampling_rate ();
			} else if (_audio_frame_rate.get() != asset->sampling_rate ()) {
				throw DCPError (_("Mismatched audio sample rates in DCP"));
			}

			_audio_length += i->main_sound()->actual_duration();
			_audio_language = try_to_parse_language (asset->language());
		}

		if (i->main_subtitle ()) {
			if (!i->main_subtitle()->asset_ref().resolved()) {
				/* We are missing this asset so we can't continue; examination will be repeated later */
				_needs_assets = true;
				return;
			}

			_text_count[static_cast<int>(TextType::OPEN_SUBTITLE)] = 1;
			_open_subtitle_language = try_to_parse_language (i->main_subtitle()->language());
		}

		for (auto j: i->closed_captions()) {
			if (!j->asset_ref().resolved()) {
				/* We are missing this asset so we can't continue; examination will be repeated later */
				_needs_assets = true;
				return;
			}

			_text_count[static_cast<int>(TextType::CLOSED_CAPTION)]++;
			_dcp_text_tracks.push_back (DCPTextTrack(j->annotation_text(), try_to_parse_language(j->language())));
		}

		if (i->main_markers ()) {
			auto rm = i->main_markers()->get();
			_markers.insert (rm.begin(), rm.end());
		}

		if (i->atmos()) {
			_has_atmos = true;
			_atmos_length += i->atmos()->actual_duration();
			if (_atmos_edit_rate != dcp::Fraction()) {
				DCPOMATIC_ASSERT (i->atmos()->edit_rate() == _atmos_edit_rate);
			}
			_atmos_edit_rate = i->atmos()->edit_rate();
		}

		if (i->main_picture()) {
			_reel_lengths.push_back (i->main_picture()->actual_duration());
		} else if (i->main_sound()) {
			_reel_lengths.push_back (i->main_sound()->actual_duration());
		} else if (i->main_subtitle()) {
			_reel_lengths.push_back (i->main_subtitle()->actual_duration());
		} else if (!i->closed_captions().empty()) {
			_reel_lengths.push_back (i->closed_captions().front()->actual_duration());
		} else if (!i->atmos()) {
			_reel_lengths.push_back (i->atmos()->actual_duration());
		}
	}

	_encrypted = cpl->any_encrypted ();
	_kdm_valid = true;

	/* Check first that anything encrypted has a key.  We must do this, as if we try to
	 * read encrypted data with asdcplib without even offering a key it will just return
	 * the encrypted data.  Secondly, check that we can read the first thing from each
	 * asset in each reel.  This checks that when we do have a key it's the right one.
	 */
	try {
		for (auto i: cpl->reels()) {
			auto pic = i->main_picture()->asset();
			if (pic->encrypted() && !pic->key()) {
				_kdm_valid = false;
			}
			auto mono = dynamic_pointer_cast<dcp::MonoPictureAsset>(pic);
			auto stereo = dynamic_pointer_cast<dcp::StereoPictureAsset>(pic);

			if (mono) {
				auto reader = mono->start_read();
				reader->set_check_hmac (false);
				reader->get_frame(0)->xyz_image();
			} else {
				auto reader = stereo->start_read();
				reader->set_check_hmac (false);
				reader->get_frame(0)->xyz_image(dcp::Eye::LEFT);
			}

			if (i->main_sound()) {
				auto sound = i->main_sound()->asset ();
				if (sound->encrypted() && !sound->key()) {
					_kdm_valid = false;
				}
				auto reader = i->main_sound()->asset()->start_read();
				reader->set_check_hmac (false);
				reader->get_frame(0);
			}

			if (i->main_subtitle()) {
				auto sub = i->main_subtitle()->asset();
				auto mxf_sub = dynamic_pointer_cast<dcp::MXF>(sub);
				if (mxf_sub && mxf_sub->encrypted() && !mxf_sub->key()) {
					_kdm_valid = false;
				}
				sub->subtitles ();
			}

			if (i->atmos()) {
				auto atmos = i->atmos()->asset();
				if (atmos->encrypted() && !atmos->key()) {
					_kdm_valid = false;
				}
				auto reader = atmos->start_read();
				reader->set_check_hmac (false);
				reader->get_frame(0);
			}
		}
	} catch (dcp::ReadError& e) {
		_kdm_valid = false;
	} catch (dcp::MiscError& e) {
		_kdm_valid = false;
	}

	_standard = cpl->standard();
	_three_d = !cpl->reels().empty() && cpl->reels().front()->main_picture() &&
		dynamic_pointer_cast<dcp::StereoPictureAsset> (cpl->reels().front()->main_picture()->asset());
	_ratings = cpl->ratings();
	for (auto i: cpl->content_versions()) {
		_content_versions.push_back (i.label_text);
	}

	_cpl = cpl->id ();
}