/*
  Copyright 2009 Nathan Phillip Brink, Ethan Zonca, Matthew Orlando

  This file is a part of DistRen.

  DistRen is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  DistRen 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 Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License
  along with DistRen.  If not, see <http://www.gnu.org/licenses/>.

 */

/*
 * **********************************************************************************
 * Slave functions / etc resides below. Wouldn't a separate file make this easier??
 *
 * Slave listens on server for a command in the format of each function...
 * We need if's for returns... ==> watchdog
 * **********************************************************************************
*/

// Provides DISTREN_REQUEST* which is in reality, DISTREN_SEND(signal) in the minds of your average joe
#include "protocol.h"
#include "options.h" // Confuse, etc.
#include "slavefuncs.h" // Slave functions
#include <string.h>
#include <stdio.h>

int slavestatus = 0; // Ugh global vars

int main(int argc, char *argv[])
{

int jobnum;
char *jobname;
int framenum;


/* Parses arguments, skips if there are no args */
	if(argc>1
		&& (strcmp("-c", argv[1]) == 0))
	{
		char *username;
		char *email;

		if(argc != 4)
		{
			fprintf(stderr, "I need more arguments!\n%d is not enough!\n Invoke 'distrenslave -c <username> <emailaddr> to register. \n Already registered? Edit your distrenslave.conf file!'", argc - 1);
			return 234;
		}

		username = argv[2];
		email = argv[3];

		if(!strchr(email, '@'))
		{
			fprintf(stderr, "I want to see an '@' in your email address!\n%s may be good enough for you, but I need more!\n", email);
			return 235;
		}
		register_user(username, email); // register_user returns a uniquely random url to a key
		fprintf(stderr, "You registered, hopefully successfully. Invoke distrenslave with no args now.");
	}
/* End arg parser */



/* Option getter: Creates vars to grab stuff from conf, uses the options include to grab this data */
char *username;
char *key;
username = NULL;
key = NULL;
cfg_t * my_cfg;
cfg_opt_t myopts[] = {
		CFG_SIMPLE_STR("username", &username),
		CFG_SIMPLE_STR("key", &key),
		CFG_END()
		};
struct options_common *commonopts;
options_init(argc,argv,&my_cfg, myopts, "slave", &commonopts);
/* End option getter */


/* If there's no key or username in the conf, let them know! */
	if(key == NULL || username == NULL){
	  fprintf(stderr, "You didn't register! Please register (Invoke '%s -c <username> <emailaddr> to register) or add your username to distrenslave.conf\n", argv[0]);
	}
	else if(key != NULL || username != NULL){
		loginuser(username); // Logs in user to the server
	}
	else{
		fprintf(stderr,"Something is terribly wrong!!!");
	}



/* Rendering code */
	if('slave recieves "start frame#, job#"'){
		fprintf(stderr, "Got frame %d in job %d, preparing to render...",framenum,jobnum);
		get('http://distren.protofusion.org/srv/job%d.tgz', jobnum); // use curl
		exec('tar -xvf job%d.tgz /tmp/distren/job%d',jobnum,jobnum); // somehow
		exec_blender("jobname. blendfile, jobnum.framenum.JPG, jobnum"); // (check the args, we'll need to adjust for different output formats, include this in the blendjob struct later)
			while('blender is running'){
				slavestatus=1; // really quite pointless now, but why not. Could be nice for logging.
				tell_the_server(DISTREN_REQUEST_PROGRESS);
				fprintf(stderr, "Rendering frame %d in job %d...",framenum,jobnum);
				delay(1000); // or not... this should be more event-driven, but should still give a heartbeat to the server
			}
		slavestatus=2; // When done rendering, set this.
	}
	if(slavestatus==2){
		fprintf(stderr, "Finished frame %d in job %d, uploading...",framenum,jobnum);
		curl_POST("/path/to/output.jpg", "http://protofusion.org/distren/output/job%d",jobnum);
		tell_the_server(DISTREN_REQUEST_DONEFRAME); // AKA "I'm done rendering that frame you sent me"
		// Slave now becomes idle, doesn't need to tell the server anything, ssh handles this.
	}

  return 0;
}