/*
    Copyright (C) 2012 Carl Hetherington <cth@carlh.net>

    This program 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.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

/** @file  src/examine_content_job.cc
 *  @brief A class to run through content at high speed to find its length.
 */

#include <boost/filesystem.hpp>
#include "examine_content_job.h"
#include "options.h"
#include "decoder_factory.h"
#include "decoder.h"
#include "transcoder.h"
#include "log.h"
#include "film.h"
#include "video_decoder.h"

#include "i18n.h"

using std::string;
using std::vector;
using std::pair;
using boost::shared_ptr;

ExamineContentJob::ExamineContentJob (shared_ptr<Film> f)
	: Job (f)
{

}

ExamineContentJob::~ExamineContentJob ()
{
}

string
ExamineContentJob::name () const
{
	if (_film->name().empty ()) {
		return _("Examine content");
	}
	
	return String::compose (_("Examine content of %1"), _film->name());
}

void
ExamineContentJob::run ()
{
	descend (0.5);
	_film->set_content_digest (md5_digest (_film->content_path ()));
	ascend ();

	descend (0.5);

	/* Set the film's length to either
	   a) a length judged by running through the content or
	   b) the length from a decoder's header.
	*/
	if (!_film->trust_content_header()) {
		/* Decode the content to get an accurate length */
		
		/* We don't want to use any existing length here, as progress
		   will be messed up.
		*/
		_film->unset_length ();
		_film->set_crop (Crop ());
		
		DecodeOptions o;
		o.decode_audio = false;
		
		Decoders decoders = decoder_factory (_film, o);
		
		set_progress_unknown ();
		while (!decoders.video->pass()) {
			/* keep going */
		}
		
		_film->set_length (decoders.video->video_frame());
		
		_film->log()->log (String::compose (N_("Video length examined as %1 frames"), _film->length().get()));
		
	} else {

		/* Get a quick decoder to get the content's length from its header */
		
		Decoders d = decoder_factory (_film, DecodeOptions());
		_film->set_length (d.video->length());
	
		_film->log()->log (String::compose (N_("Video length obtained from header as %1 frames"), _film->length().get()));
	}

	ascend ();
	set_progress (1);
	set_state (FINISHED_OK);
}