/*
    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/transcode_job.cc
 *  @brief A job which transcodes from one format to another.
 */

#include <iostream>
#include <iomanip>
#include "transcode_job.h"
#include "film.h"
#include "format.h"
#include "transcoder.h"
#include "log.h"
#include "encoder.h"

using std::string;
using std::stringstream;
using std::fixed;
using std::setprecision;
using boost::shared_ptr;

/** @param s Film to use.
 *  @param o Decode options.
 *  @param req Job that must be completed before this job is run.
 */
TranscodeJob::TranscodeJob (shared_ptr<Film> f, DecodeOptions o, shared_ptr<Job> req)
	: Job (f, req)
	, _decode_opt (o)
{
	
}

string
TranscodeJob::name () const
{
	return String::compose ("Transcode %1", _film->name());
}

void
TranscodeJob::run ()
{
	try {

		_film->log()->log ("Transcode job starting");
		_film->log()->log (String::compose ("Audio delay is %1ms", _film->audio_delay()));

		_encoder.reset (new Encoder (_film));
		Transcoder w (_film, _decode_opt, this, _encoder);
		w.go ();
		set_progress (1);
		set_state (FINISHED_OK);

		_film->set_dcp_intrinsic_duration (_encoder->video_frames_out ());

		_film->log()->log ("Transcode job completed successfully");
		_film->log()->log (String::compose ("DCP intrinsic duration is %1", _encoder->video_frames_out()));

	} catch (std::exception& e) {

		set_progress (1);
		set_state (FINISHED_ERROR);
		_film->log()->log (String::compose ("Transcode job failed (%1)", e.what()));

		throw;
	}
}

string
TranscodeJob::status () const
{
	if (!_encoder) {
		return "0%";
	}

	float const fps = _encoder->current_frames_per_second ();
	if (fps == 0) {
		return Job::status ();
	}

	stringstream s;

	s << Job::status ();

	if (!finished ()) {
		s << "; " << fixed << setprecision (1) << fps << " frames per second";
	}
	
	return s.str ();
}

int
TranscodeJob::remaining_time () const
{
	float fps = _encoder->current_frames_per_second ();
	if (fps == 0) {
		return 0;
	}

	if (!_film->length()) {
		return 0;
	}

	/* Compute approximate proposed length here, as it's only here that we need it */
	int length = _film->length().get();
	DCPFrameRate const dfr (_film->frames_per_second ());
	if (dfr.skip) {
		length /= 2;
	}
	/* If we are repeating it shouldn't affect transcode time, so don't take it into account */

	/* We assume that dcp_length() is valid, if it is set */
	int const left = length - _encoder->video_frames_out();
	return left / fps;
}