/*

  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 "asprintf.h"

#include "protocol.h"

#include "options.h"

#include "remoteio.h"

#include "slavefuncs.h"

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/stat.h>

#include <unistd.h>

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

{

  char curopt;

  char *username;

  while(-1 != (curopt = getopt(argc, argv, "u:h")))

     {

       if(curopt == ':')

         {

           fprintf(stderr, "-%c: is missing an argument\n", optopt);

           return 1;

         }

       else if(curopt == '?')

         {

           fprintf(stderr, "-%c: invalid option specified\n", optopt);

           return 1;

         }

       else if(curopt == 'h')

         {

           fprintf(stderr, "Usage: distrenslave [option] \nStarts a distren slave\n\t-u\tset username (run after fresh install)\n\t-h\tshow this help\n");

           return 2;

         }

       else if(curopt == 'u')

         username = strdup(optarg);

         fprintf(stderr, "Putting username \"%s\" in distrenslave.conf\n", username);

         conf_replace("distrenslave.conf", "!username", username);

         fprintf(stderr, "Please invoke distrenslave with no arguments to run with the username you just set\n");

         return 0;

     }

  /* Get conf data */

  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 */

  fprintf(stderr,"Connecting to server...\n");

  int haveWork = 0;

  while(1)

    {

    // request work

    fprintf(stderr,"Requesting work...\n");

    sendSignal(comm_slave, DISTREN_REQUEST_GETWORK);

    /* If we got a frame */

    if(haveWork)

      {

        fprintf(stderr,"Got work from server...\n");

        /* @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 %s failed. Check your network connection.\n",urltoTar);

              return 1; // Eventually make a retry loop

            }

          }

        else

          fprintf(stderr, "Using cached job file...\n");

        _distren_asprintf(&outdir, "/tmp/distren/job%d", jobnum);

        mkdir("/tmp/distren", 0750); /* @FIXME: Change to tmpdir once it exists */

        mkdir(outdir, 0750);

        _distren_asprintf(&tarcmd, "tar -xvf \"%s\" -C \"%s\"", pathtoTar, outdir); /* @TODO:Use a lib here! */

        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, "XML job data parsing has failed. Please contact a developer, or try again.\n");

            return 1;

          }

        /* Variable-fillers which require XML */

        outputExt = myjob->output_format;

        /* 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))

          {

            fprintf(stderr,"Error running Blender. Check your installation and/or your PATH.\n");

            return 1;

          }

        free(pathtoJobfile);

        /* Post-execution */

        fprintf(stderr, "Finished frame %d in job %d, uploading...\n", 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. Retrying upload...\n");

            int tries=1;

            while(tries<=10 && curlpost(pathtoOutput, urltoOutput))

              {

                fprintf(stderr, "Upload failed. Trying again in 10 seconds... (attempt %d of 10)\n", 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 that rendering and upload are complete

        // sendServer(DISTREN_REQUEST_DONEFRAME);

        sendSignal(comm_slave, DISTREN_REQUEST_DONEFRAME);

      }

    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

  }

  fprintf(stderr,"Closing connection to server...\n");

  remoteio_close(comm_slave);

  return 0;

}