/** Fill variables after crash / shutdown from XML dumps */

int start_data(){

  struct stat buffer;

  if(stat(SYSCONFDIR "/data.xml", &buffer) == 0){

    // @TODO: retrieve total_finished_jobs and total_finished_frames from xml file

    fprintf(stderr,"Parsing XML files and restoring previous state...\n");

    return 1;

  }

  else{

    general_info.total_finished_jobs = 0;

    general_info.total_frames_rendered = 0;

    fprintf(stderr,"Can't find XML dump, starting up fresh.\n");

    return 2;

  }

  free(&buffer); // @TODO: Is this pointless?

}

/** Finish-Setter: Sets a frame to the "completed" status.*/

void finish_frame(struct distrenjob *head, struct distrenjob *distrenjob, int frame){

  distrenjob->frameset[frame].status = 2;

  distrenjob->frameset[frame].time_to_render = (clock() - distrenjob[jobnum].frameset[frame].start_time); // Consider changing time-to-render to time-for-frame or something?

  distrenjob->avg_render_time = ((distrenjob->avg_render_time*(distrenjob->completed_frames)) + distrenjob->frameset[frame].time_to_render)/(distrenjob->completed_frames + 1);

  distrenjob->completed_frames++;

  general_info.total_frames_rendered++; // Increase total frames var for stats

  if(distrenjob->completed_frames == distrenjob->total_frames)

    {

      mortition(head, distrenjob);

    }

}

/** mortition check to see if a job is actually done by scanning the folder of the job to make sure all frames are present*/

// called mortition because it checks the finished "dead" job

void mortition(struct distrenjob *head, struct distrenjob *job){

  short int isJobDone;

  int counter;

  char path_and_number[20];

  struct stat buffer;

  isJobDone = 1; // set isJobDone to true

  for(counter = 0; counter < job->total_frames; counter++)

    {

      sprintf(path_and_number, "stor/job%d/out/%d.%s", job->jobnum, (counter + job->frameset[0].num), job->output_format);

      if(stat(path_and_number, &buffer) != -1)

        {

          job->frameset[counter].status = 0;

          job->completed_frames--;

          isJobDone = 0; // if a missing frame is found, set isJobDone to false

        }

    }

  if(isJobDone)

    {

      distrenjob_remove(&head, job);

    }

}

/**

   creates a structure from starting data, then calls another function to actually add that struct to the queue

*/

void prepare_distrenjob(struct frameset *head, int type, char *name, char *submitter, char *email, int priority, int start_frame, int end_frame)

{

  int counter2;

  int counter;

  struct distrenjob *distrenjob;

  distrenjob->type = 1;

  distrenjob->name = name;

  distrenjob->submitter = submitter;

  distrenjob->email = email;

  distrenjob->priority = priority;

  distrenjob->total_frames = (end_frame - start_frame + 1); // sets the total number of frames in animation for status purposes

  distrenjob->frameset = malloc(distrenjob->total_frames);

  /* @TODO: should the aove be malloc(sizeof(struct frameset) * distrenjob->total_frames? */

  /*

  distrenjob->frameset = malloc(sizeof(struct frameset) * numframes);

  if(!job->frameset)

    fprintf(stderr, "Error allocating memory\n");

  */

  /* prepares all the frames by setting that status to "unassigned" */

  counter2 = start_frame;

  for(counter = 0; counter <= (end_frame- start_frame + 1); counter++){

    distrenjob->frameset[counter].num = counter2;

    distrenjob->frameset[counter].status = 0;

    counter2++;

  }

  distrenjob_enqueue(head, distrenjob);

  general_info.jobs_in_queue++;

}

/* distrenjob_enqueue: This function adds the job to the queue based on its priority */

void distrenjob_enqueue(struct distrenjob *head, struct distrenjob *job) {

  @return 0 success, other: error

*/

/*@TODO: change frame_finder to job_finder */

int frame_finder(struct distrenjob *head, struct distrenjob **job, struct frameset **frame)

{

  int your_frame;  // your_frame is an integer value that will be given to the client as the frame number to render

  short int your_job_type;

  unsigned short int found;

  struct distrenjob *distrenjob_ptr;

  your_job_type = 0;

  found = 0;

  /* iterate through jobs from first to last */

  for(distrenjob_ptr = head->next; !found && !distrenjob_ptr; distrenjob_ptr = distrenjob_ptr->next)

    {

      // while frame hasn't been found, and your_frame is less than the length of the frameset array

      for(your_frame = 0; !found && your_frame < distrenjob_ptr->total_frames; your_frame++)

          if(distrenjob_ptr->frameset[your_frame].status == 0)

            {

              found = 1;

              your_job_type = distrenjob_ptr->type;

              distrenjob_ptr->frameset[your_frame].status = 1;

              distrenjob_ptr->frameset[your_frame].start_time = clock();

              break;

            }

    }

// end of while statement... job must be found or linked list must be ended to get out of here

      if(!found)

        {

          fprintf(stderr, "No more jobs to render\n");

          return 1;

        }

    // the actual frame number to be rendered by the client is start_frame + your_frame

    *job = distrenjob_ptr;

    *frame = &distrenjob_ptr->frameset[your_frame];

      /* should the job be removed now? ANSWER: well, if a computer decides not to return their frame then we lost our data... so its not done yet. */

      fprintf(stderr, "Job %d is finished, this is probably the place to call the job-removal function\n", distrenjob_ptr->jobnum);

      /* @TODO: At this point, all slaves should be instructed to delete the source data for this job. */

  return 0;

}

/** Checks for dead, laggy, or stale slaves */

void blend_frame_watchdog(struct distrenjob *distrenjob_head)

   Removes a distrenjob from the distrenjob linked list.

   @arg head a double pointer. the head pointer will have to be changed if distrenjob == *head. Thus, make sure that the pointer points to the pointer to the head that all functions use. (I'm going to come back to this and misunderstand myself ;-))

 */

void distrenjob_remove(struct distrenjob **head, struct distrenjob *bj)

{

  struct distrenjob *previous_distrenjob;

  if(bj == *head)

    *head = bj->next;

  else

    {

      for(previous_distrenjob = *head;

        previous_distrenjob

          && previous_distrenjob->next != bj; /*< stop on the distrenjob that comes before bj */

          previous_distrenjob = previous_distrenjob->next)

	/* all of the action is in the definition of the for loop itself */;

      /*

	This removes references to bj from the linked list. I.E., we now skip bj when iterating through the list

       */

      previous_distrenjob->next = bj->next;

    }

}

/* Grabs config info from confs */

int distrend_do_config(int argc, char *argv[], struct distrend_config **config)

{

  cfg_opt_t myopts_listen[] =

    {

      CFG_SIMPLE_STR("type", NULL),

      CFG_SIMPLE_STR("path", NULL),

      CFG_SIMPLE_INT("port", NULL),

      CFG_END()

    };

  cfg_opt_t myopts[] =

    {

      CFG_SEC("listen",  /* this must be imported into struct listens (which must still be declared) */

          myopts_listen,

          CFGF_MULTI),

      CFG_SIMPLE_STR("datadir", NULL),

      CFG_END()

    };

  struct distrenjob *distrenjob;