/*
    Copyright (C) 2014-2018 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_content.h"
#include "video_content.h"
#include "audio_content.h"
#include "dcp_examiner.h"
#include "job.h"
#include "film.h"
#include "config.h"
#include "overlaps.h"
#include "compose.hpp"
#include "dcp_decoder.h"
#include "subtitle_content.h"
#include <dcp/dcp.h>
#include <dcp/raw_convert.h>
#include <dcp/exceptions.h>
#include <dcp/reel_picture_asset.h>
#include <dcp/reel.h>
#include <libxml++/libxml++.h>
#include <boost/foreach.hpp>
#include <iterator>
#include <iostream>

#include "i18n.h"

using std::string;
using std::cout;
using std::distance;
using std::pair;
using std::vector;
using std::list;
using boost::shared_ptr;
using boost::scoped_ptr;
using boost::optional;
using boost::function;
using boost::dynamic_pointer_cast;
using dcp::raw_convert;

int const DCPContentProperty::NEEDS_ASSETS       = 600;
int const DCPContentProperty::NEEDS_KDM          = 601;
int const DCPContentProperty::REFERENCE_VIDEO    = 602;
int const DCPContentProperty::REFERENCE_AUDIO    = 603;
int const DCPContentProperty::REFERENCE_SUBTITLE = 604;
int const DCPContentProperty::NAME               = 605;
int const DCPContentProperty::HAS_SUBTITLES      = 606;

DCPContent::DCPContent (shared_ptr<const Film> film, boost::filesystem::path p)
	: Content (film)
	, _encrypted (false)
	, _needs_assets (false)
	, _kdm_valid (false)
	, _reference_video (false)
	, _reference_audio (false)
	, _reference_subtitle (false)
	, _three_d (false)
{
	read_directory (p);
	set_default_colour_conversion ();
}

DCPContent::DCPContent (shared_ptr<const Film> film, cxml::ConstNodePtr node, int version)
	: Content (film, node)
{
	video = VideoContent::from_xml (this, node, version);
	audio = AudioContent::from_xml (this, node, version);
	subtitle = SubtitleContent::from_xml (this, node, version);

	if (video && audio) {
		audio->set_stream (
			AudioStreamPtr (
				new AudioStream (
					node->number_child<int> ("AudioFrameRate"),
					/* AudioLength was not present in some old metadata versions */
					node->optional_number_child<Frame>("AudioLength").get_value_or (
						video->length() * node->number_child<int>("AudioFrameRate") / video_frame_rate().get()
						),
					AudioMapping (node->node_child ("AudioMapping"), version)
					)
				)
			);
	}

	_name = node->string_child ("Name");
	_encrypted = node->bool_child ("Encrypted");
	_needs_assets = node->optional_bool_child("NeedsAssets").get_value_or (false);
	if (node->optional_node_child ("KDM")) {
		_kdm = dcp::EncryptedKDM (node->string_child ("KDM"));
	}
	_kdm_valid = node->bool_child ("KDMValid");
	_reference_video = node->optional_bool_child ("ReferenceVideo").get_value_or (false);
	_reference_audio = node->optional_bool_child ("ReferenceAudio").get_value_or (false);
	_reference_subtitle = node->optional_bool_child ("ReferenceSubtitle").get_value_or (false);
	if (node->optional_string_child("Standard")) {
		string const s = node->optional_string_child("Standard").get();
		if (s == "Interop") {
			_standard = dcp::INTEROP;
		} else if (s == "SMPTE") {
			_standard = dcp::SMPTE;
		} else {
			DCPOMATIC_ASSERT (false);
		}
	}
	_three_d = node->optional_bool_child("ThreeD").get_value_or (false);
	_cpl = node->optional_string_child("CPL");
	BOOST_FOREACH (cxml::ConstNodePtr i, node->node_children("ReelLength")) {
		_reel_lengths.push_back (raw_convert<int64_t> (i->content ()));
	}
}

void
DCPContent::read_directory (boost::filesystem::path p)
{
	for (boost::filesystem::directory_iterator i(p); i != boost::filesystem::directory_iterator(); ++i) {
		if (boost::filesystem::is_regular_file (i->path())) {
			_paths.push_back (i->path());
		} else if (boost::filesystem::is_directory (i->path ())) {
			read_directory (i->path());
		}
	}
}

void
DCPContent::examine (shared_ptr<Job> job)
{
	bool const needed_assets = needs_assets ();
	bool const needed_kdm = needs_kdm ();
	string const old_name = name ();
	bool had_subtitles = static_cast<bool> (subtitle);

	if (job) {
		job->set_progress_unknown ();
	}
	Content::examine (job);

	shared_ptr<DCPExaminer> examiner (new DCPExaminer (shared_from_this ()));

	if (examiner->has_video()) {
		{
			boost::mutex::scoped_lock lm (_mutex);
			video.reset (new VideoContent (this));
		}
		video->take_from_examiner (examiner);
		set_default_colour_conversion ();
	}

	if (examiner->has_audio()) {
		{
			boost::mutex::scoped_lock lm (_mutex);
			audio.reset (new AudioContent (this));
		}
		AudioStreamPtr as (new AudioStream (examiner->audio_frame_rate(), examiner->audio_length(), examiner->audio_channels()));
		audio->set_stream (as);
		AudioMapping m = as->mapping ();
		film()->make_audio_mapping_default (m);
		as->set_mapping (m);
		signal_changed (AudioContentProperty::STREAMS);
	}

	bool has_subtitles = false;
	{
		boost::mutex::scoped_lock lm (_mutex);
		_name = examiner->name ();
		if (examiner->has_subtitles ()) {
			subtitle.reset (new SubtitleContent (this));
		} else {
			subtitle.reset ();
		}
		has_subtitles = static_cast<bool> (subtitle);
		_encrypted = examiner->encrypted ();
		_needs_assets = examiner->needs_assets ();
		_kdm_valid = examiner->kdm_valid ();
		_standard = examiner->standard ();
		_three_d = examiner->three_d ();
		_cpl = examiner->cpl ();
		_reel_lengths = examiner->reel_lengths ();
	}

	if (had_subtitles != has_subtitles) {
		signal_changed (DCPContentProperty::HAS_SUBTITLES);
	}

	if (needed_assets != needs_assets ()) {
		signal_changed (DCPContentProperty::NEEDS_ASSETS);
	}

	if (needed_kdm != needs_kdm ()) {
		signal_changed (DCPContentProperty::NEEDS_KDM);
	}

	if (old_name != name ()) {
		signal_changed (DCPContentProperty::NAME);
	}

	signal_changed (AudioContentProperty::STREAMS);

	if (video) {
		video->set_frame_type (_three_d ? VIDEO_FRAME_TYPE_3D : VIDEO_FRAME_TYPE_2D);
	}
}

string
DCPContent::summary () const
{
	boost::mutex::scoped_lock lm (_mutex);
	return String::compose (_("%1 [DCP]"), _name);
}

string
DCPContent::technical_summary () const
{
	string s = Content::technical_summary() + " - ";
	if (video) {
		s += video->technical_summary() + " - ";
	}
	if (audio) {
		s += audio->technical_summary() + " - ";
	}
	return s;
}

void
DCPContent::as_xml (xmlpp::Node* node, bool with_paths) const
{
	node->add_child("Type")->add_child_text ("DCP");

	Content::as_xml (node, with_paths);

	if (video) {
		video->as_xml (node);
	}

	if (audio) {
		audio->as_xml (node);
		node->add_child("AudioFrameRate")->add_child_text (raw_convert<string> (audio->stream()->frame_rate()));
		node->add_child("AudioLength")->add_child_text (raw_convert<string> (audio->stream()->length()));
		audio->stream()->mapping().as_xml (node->add_child("AudioMapping"));
	}

	if (subtitle) {
		subtitle->as_xml (node);
	}

	boost::mutex::scoped_lock lm (_mutex);
	node->add_child("Name")->add_child_text (_name);
	node->add_child("Encrypted")->add_child_text (_encrypted ? "1" : "0");
	node->add_child("NeedsAssets")->add_child_text (_needs_assets ? "1" : "0");
	if (_kdm) {
		node->add_child("KDM")->add_child_text (_kdm->as_xml ());
	}
	node->add_child("KDMValid")->add_child_text (_kdm_valid ? "1" : "0");
	node->add_child("ReferenceVideo")->add_child_text (_reference_video ? "1" : "0");
	node->add_child("ReferenceAudio")->add_child_text (_reference_audio ? "1" : "0");
	node->add_child("ReferenceSubtitle")->add_child_text (_reference_subtitle ? "1" : "0");
	if (_standard) {
		switch (_standard.get ()) {
		case dcp::INTEROP:
			node->add_child("Standard")->add_child_text ("Interop");
			break;
		case dcp::SMPTE:
			node->add_child("Standard")->add_child_text ("SMPTE");
			break;
		default:
			DCPOMATIC_ASSERT (false);
		}
	}
	node->add_child("ThreeD")->add_child_text (_three_d ? "1" : "0");
	if (_cpl) {
		node->add_child("CPL")->add_child_text (_cpl.get ());
	}
	BOOST_FOREACH (int64_t i, _reel_lengths) {
		node->add_child("ReelLength")->add_child_text (raw_convert<string> (i));
	}
}

DCPTime
DCPContent::full_length () const
{
	if (!video) {
		return DCPTime();
	}
	FrameRateChange const frc (active_video_frame_rate (), film()->video_frame_rate ());
	return DCPTime::from_frames (llrint (video->length () * frc.factor ()), film()->video_frame_rate ());
}

string
DCPContent::identifier () const
{
	string s = Content::identifier() + "_";

	if (video) {
		s += video->identifier() + "_";
	}

	if (subtitle) {
		s += subtitle->identifier () + " ";
	}

	s += string (_reference_video ? "1" : "0") + string (_reference_subtitle ? "1" : "0");
	return s;
}

void
DCPContent::add_kdm (dcp::EncryptedKDM k)
{
	_kdm = k;
}

void
DCPContent::add_ov (boost::filesystem::path ov)
{
	read_directory (ov);
}

bool
DCPContent::can_be_played () const
{
	return !needs_kdm() && !needs_assets();
}

bool
DCPContent::needs_kdm () const
{
	boost::mutex::scoped_lock lm (_mutex);
	return _encrypted && !_kdm_valid;
}

bool
DCPContent::needs_assets () const
{
	boost::mutex::scoped_lock lm (_mutex);
	return _needs_assets;
}

vector<boost::filesystem::path>
DCPContent::directories () const
{
	return dcp::DCP::directories_from_files (paths());
}

void
DCPContent::add_properties (list<UserProperty>& p) const
{
	Content::add_properties (p);
	if (video) {
		video->add_properties (p);
	}
	if (audio) {
		audio->add_properties (p);
	}
}

void
DCPContent::set_default_colour_conversion ()
{
	/* Default to no colour conversion for DCPs */
	if (video) {
		video->unset_colour_conversion ();
	}
}

void
DCPContent::set_reference_video (bool r)
{
	{
		boost::mutex::scoped_lock lm (_mutex);
		_reference_video = r;
	}

	signal_changed (DCPContentProperty::REFERENCE_VIDEO);
}

void
DCPContent::set_reference_audio (bool r)
{
	{
		boost::mutex::scoped_lock lm (_mutex);
		_reference_audio = r;
	}

	signal_changed (DCPContentProperty::REFERENCE_AUDIO);
}

void
DCPContent::set_reference_subtitle (bool r)
{
	{
		boost::mutex::scoped_lock lm (_mutex);
		_reference_subtitle = r;
	}

	signal_changed (DCPContentProperty::REFERENCE_SUBTITLE);
}

list<DCPTimePeriod>
DCPContent::reels () const
{
	list<int64_t> reel_lengths = _reel_lengths;
	if (reel_lengths.empty ()) {
		/* Old metadata with no reel lengths; get them here instead */
		try {
			scoped_ptr<DCPExaminer> examiner (new DCPExaminer (shared_from_this()));
			reel_lengths = examiner->reel_lengths ();
		} catch (...) {
			/* Could not examine the DCP; guess reels */
			reel_lengths.push_back (length_after_trim().frames_round (film()->video_frame_rate ()));
		}
	}

	list<DCPTimePeriod> p;

	/* This content's frame rate must be the same as the output DCP rate, so we can
	   convert `directly' from ContentTime to DCPTime.
	*/

	/* The starting point of this content on the timeline */
	DCPTime pos = position() - DCPTime (trim_start().get());

	BOOST_FOREACH (int64_t i, reel_lengths) {
		/* This reel runs from `pos' to `to' */
		DCPTime const to = pos + DCPTime::from_frames (i, film()->video_frame_rate());
		if (to > position()) {
			p.push_back (DCPTimePeriod (max(position(), pos), min(end(), to)));
			if (to > end()) {
				break;
			}
		}
		pos = to;
	}

	return p;
}

list<DCPTime>
DCPContent::reel_split_points () const
{
	list<DCPTime> s;
	BOOST_FOREACH (DCPTimePeriod i, reels()) {
		s.push_back (i.from);
	}
	return s;
}

bool
DCPContent::can_reference (function<shared_ptr<ContentPart> (shared_ptr<const Content>)> part, string overlapping, string& why_not) const
{
	/* We must be using the same standard as the film */
	if (_standard) {
		if (_standard.get() == dcp::INTEROP && !film()->interop()) {
			/// TRANSLATORS: this string will follow "Cannot reference this DCP: "
			why_not = _("it is Interop and the film is set to SMPTE.");
			return false;
		} else if (_standard.get() == dcp::SMPTE && film()->interop()) {
			/// TRANSLATORS: this string will follow "Cannot reference this DCP: "
			why_not = _("it is SMPTE and the film is set to Interop.");
			return false;
		}
	}

	/* And the same frame rate */
	if (!video_frame_rate() || (lrint(video_frame_rate().get()) != film()->video_frame_rate())) {
		/// TRANSLATORS: this string will follow "Cannot reference this DCP: "
		why_not = _("it has a different frame rate to the film.");
		return false;
	}

	list<DCPTimePeriod> const fr = film()->reels ();

	list<DCPTimePeriod> reel_list;
	try {
		reel_list = reels ();
	} catch (dcp::DCPReadError) {
		/* We couldn't read the DCP; it's probably missing */
		return false;
	} catch (dcp::KDMDecryptionError) {
		/* We have an incorrect KDM */
		return false;
	}

	/* fr must contain reels().  It can also contain other reels, but it must at
	   least contain reels().
	*/
	BOOST_FOREACH (DCPTimePeriod i, reel_list) {
		if (find (fr.begin(), fr.end(), i) == fr.end ()) {
			/// TRANSLATORS: this string will follow "Cannot reference this DCP: "
			why_not = _("its reel lengths differ from those in the film; set the reel mode to 'split by video content'.");
			return false;
		}
	}

	ContentList a = overlaps (film()->content(), part, position(), end());
	if (a.size() != 1 || a.front().get() != this) {
		why_not = overlapping;
		return false;
	}

	return true;
}

bool
DCPContent::can_reference_video (string& why_not) const
{
	if (!video) {
		why_not = _("There is no video in this DCP");
		return false;
	}

	if (film()->frame_size() != video->size()) {
		/// TRANSLATORS: this string will follow "Cannot reference this DCP: "
		why_not = _("its video frame size differs from the film's.");
		return false;
	}

	/// TRANSLATORS: this string will follow "Cannot reference this DCP: "
	return can_reference (bind (&Content::video, _1), _("it overlaps other video content; remove the other content."), why_not);
}

bool
DCPContent::can_reference_audio (string& why_not) const
{
	shared_ptr<DCPDecoder> decoder;
	try {
		decoder.reset (new DCPDecoder (shared_from_this(), film()->log(), false));
	} catch (dcp::DCPReadError) {
		/* We couldn't read the DCP, so it's probably missing */
		return false;
	} catch (dcp::KDMDecryptionError) {
		/* We have an incorrect KDM */
		return false;
	}

        BOOST_FOREACH (shared_ptr<dcp::Reel> i, decoder->reels()) {
                if (!i->main_sound()) {
			/// TRANSLATORS: this string will follow "Cannot reference this DCP: "
                        why_not = _("it does not have sound in all its reels.");
                        return false;
                }
        }

	/// TRANSLATORS: this string will follow "Cannot reference this DCP: "
        return can_reference (bind (&Content::audio, _1), _("it overlaps other audio content; remove the other content."), why_not);
}

bool
DCPContent::can_reference_subtitle (string& why_not) const
{
	shared_ptr<DCPDecoder> decoder;
	try {
		decoder.reset (new DCPDecoder (shared_from_this(), film()->log(), false));
	} catch (dcp::DCPReadError) {
		/* We couldn't read the DCP, so it's probably missing */
		return false;
	} catch (dcp::KDMDecryptionError) {
		/* We have an incorrect KDM */
		return false;
	}

        BOOST_FOREACH (shared_ptr<dcp::Reel> i, decoder->reels()) {
                if (!i->main_subtitle()) {
			/// TRANSLATORS: this string will follow "Cannot reference this DCP: "
                        why_not = _("it does not have subtitles in all its reels.");
                        return false;
                }
        }

	/// TRANSLATORS: this string will follow "Cannot reference this DCP: "
	return can_reference (bind (&Content::subtitle, _1), _("it overlaps other subtitle content; remove the other content."), why_not);
}

void
DCPContent::take_settings_from (shared_ptr<const Content> c)
{
	shared_ptr<const DCPContent> dc = dynamic_pointer_cast<const DCPContent> (c);
	if (!dc) {
		return;
	}

	_reference_video = dc->_reference_video;
	_reference_audio = dc->_reference_audio;
	_reference_subtitle = dc->_reference_subtitle;
}

void
DCPContent::set_cpl (string id)
{
	boost::mutex::scoped_lock lm (_mutex);
	_cpl = id;
}