/*
  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/>.

*/

#include "protocol.h"
#include "options.h"
#include "slavefuncs.h"
#include "asprintf.h"
#include "remoteio.h"

#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include <stdlib.h>

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

  int counter;

  /* Parse arguments */
  for(counter = 0; counter < argc; counter ++)
    if(strcmp(argv[counter], "-h") == 0)
      {
	fprintf(stderr, "Usage: distrenslave [option] \nStarts a distren slave\n\t-h\tshow this help\n");
	return 2;
      }

  /* Get conf data */
  char *username;
  char *datadir;
  cfg_t * my_cfg;
  cfg_opt_t myopts[] = {
    CFG_SIMPLE_STR("username", &username),
    CFG_SIMPLE_STR("datadir", &datadir),
    CFG_END()
  };
  struct options_common *commonopts;
  username = NULL;
  options_init(argc, argv, &my_cfg, myopts, "slave", &commonopts);


  /* Notifies the user if there no username in .conf */
  if(username == NULL || strcmp(username, "!username") == 0 )
    fprintf(stderr, "\nPlease ensure that your username is present in distrenslave.conf\n");
  else 
    if( username != NULL || strcmp(username, "!username") != 0 )
      {
	// Log in the user
	if(login_user(username) == 1){
	  fprintf(stderr, "You should now be logged into distren.\n");
	}
	else
	  {
	    fprintf(stderr, "Login failed, please check your username. If you have not registered, please do so on the DistRen website.\n");
	    return 0;
	  }
      }
    else
      {
	fprintf(stderr, "Please check your distrenslave.conf, it appears to be incorrectly formatted.\n");
      }


  int jobnum = 0;
  int framenum = 0;

  char *urltoTar;      /* Full URL to the server-side location of job#.tgz */
  char *pathtoTar;     /* Full path to the location of the job#.tgz */

  char *urltoOutput;   /* Full URL where output is posted */
  char *pathtoJobfile; /* Full path to the job's main file */
  char *pathtoXml;     /* Full path to the job's xml file */
  char *pathtoOutput;  /* Full path to the output (rendered) file */
  char *outputExt;     /* Output Extension (e.g., JPG) */

  char *tarcmd;        /* Command to run for tar. Migrate to libtar sometime */
  char *outdir;        /* Output Directory for tar */
  char *jobdatapath;   /* Path to job data */

  struct distrenjob *myjob; /* Structure to hold data gathered from the XML file */

  int haveWork = 0;

  while(1)
    {

    tell_the_server(0); // Give me some work!
    /* If we got a frame */
    if(haveWork)
      {
        /* @TODO: Add remotio hooks */
        // jobnum = remoteio_read(jobnum); /* Set jobnum from remoteio (we could use info from struct, but we need this info to download the xmlfile */
        //framenum = remoteio_read(jobnum); /* Set framenum from remoteio */

        fprintf(stderr, "Preparing to render frame %d in job %d\n", framenum, jobnum);

        // Variable Preparation
        _distren_asprintf(&jobdatapath, "job%d", jobnum);
        _distren_asprintf(&urltoTar, "http://protofusion.org/distren/stor/job%d/job%d.tar.gz", jobnum); // Prepares URL to download from
        _distren_asprintf(&pathtoTar, "%s/stor/jobdata/job%d.tar.gz", datadir, jobnum); // Prepares destination to save to
        _distren_asprintf(&pathtoJobfile, "%s/%s/job.blend", datadir, jobdatapath ); // Prepares the path to the jobfile
        _distren_asprintf(&urltoOutput, "http://protofusion.org/distren/stor/tmp/", jobdatapath ); // Prepares the URL where output is posted
        _distren_asprintf(&pathtoXml, "%s/job%d/job%d.xml", datadir, jobnum ); // Prepares the path to the job's XML file
        free(jobdatapath);

        // Prepare to download the job tar if it isn't  present
        struct stat buffer;
        int fstatus = stat(pathtoJobfile, &buffer);
        if(fstatus == -1)
          {
            // Download the Tar
            if( curlget(urltoTar, pathtoTar) == 0){
              fprintf(stderr, "Job data retrieved successfully\n");
              free(urltoTar);
            }
            else {
              fprintf(stderr, "Downloading job data from server failed. Check your network connection.\n");
              return 1; // for now
            }
          }
        else
          fprintf(stderr, "Using cached job file...\n");

        _distren_asprintf(&outdir, "/tmp/distren/job%d", jobnum); /*< @TODO: free() */
        mkdir("/tmp/distren", 0750); /* @TODO: Make this less *nix-specific */
        mkdir(outdir, 0750);

        _distren_asprintf(&tarcmd, "tar -xvf \"%s\" -C \"%s\"", pathtoTar, outdir); /* @TODO: Make this portable. Libtar or something? */
        system(tarcmd);
        free(tarcmd);
        free(pathtoTar);
        free(outdir);

        /* Parses a job's XML file, puts data in the myjob struct */
        if(xml2distrenjob(&myjob, pathtoXml) == 0)
          {
            fprintf(stderr, "Well, the XML craziness may have worked. Maybe. \n");
            free(pathtoXml);

            /* Frees things up if it was successful. xml2distrenjob() really (usually) only fails if malloc'ing inside it fails */
            distrenjob_free(&myjob);
          }
        else
          {
            fprintf(stderr, "I think the XML craziness may have failed, so I'll terminate just for fun.\n");
            return 1;
          }

        /* Variable-fillers which require XML */
        outputExt = myjob->output_format; /* @TODO: FIXME! <-- I WILL! */
        /* Prepares the path to the jobfile */
        _distren_asprintf(&pathtoOutput, "%s/job%d/output/job%d-frame%d.%s", datadir, jobnum, jobnum, framenum, outputExt );
        free(outputExt);

        /* Execute blender */
        if(exec_blender(pathtoJobfile, pathtoOutput, framenum)){ /* @TODO: This warning should be fixed :D */
            fprintf(stderr,"Error running Blender. Check your installation and/or your PATH.");
            return 1;
        }
        free(pathtoJobfile);

        /* When blender is finished, run this... */
        fprintf(stderr, "Finished frame %d in job %d, uploading...", framenum, jobnum);
        if( !curlpost(pathtoOutput, urltoOutput)){ // Uploads output
          fprintf(stderr,"Upload successful, removing old output...\n");
          remove(pathtoOutput); // Delete the file after its uploaded
        }
        else{
          fprintf(stderr,"Upload failed. Check your network connection. Trying again...");
          int tries=0;
          while(tries<10 && curlpost(pathtoOutput, urltoOutput)){
              fprintf(stderr, "Upload failed. Trying again in 10 seconds... (attempt %d of 10)", tries);
              tries++;
              sleep(10);
          }
          // @TODO: Keep track of files that we were unable to upload, and upload them later
        }
        free(urltoOutput);
        free(pathtoOutput);

        tell_the_server(DISTREN_REQUEST_DONEFRAME); /* Tells the server that it's done rendering, and upload is done */
      }
    else
      fprintf(stderr,"Nothing to do. Idling...\n");

    // If the server says that every frame for the last jobnum is finished, OR if the data is getting old
    if(1 == 0){
      // Note: individual frames are already deleted after uploading,
      // except for ones that couldn't be uploaded
      delete_jobdata(jobnum, datadir);
    }

    sleep(5); // Poll 5 seconds. @TODO: Remove all polling
  }
  return 0;
}