#include <confuse.h>

#include <stdio.h>

#include <stdlib.h>

#include <malloc.h>

#include <unistd.h> /* getopt */

#include <time.h>

#include <sys/stat.h>

/* ******************* Structs ************************ */

// Gets config info from confs

struct distrend_config

{

  cfg_t *mycfg;

  struct options_common *options;

  struct distrend_listen **listens; /*< Null terminated array of structs */

  char *datadir;

};

/*

 frame[frame] Status Assignments:

  "NULL" - don't render me

  "0" - canceled

  "1" - unassigned

  "2" - assigned to slave

  "3" - completed by slave and uploaded

*/

struct general_info {

  short int jobs_in_queue; //

  unsigned short int free_clients;

  unsigned short int rendering_clients;//

  unsigned short int total_finished_jobs; //

  unsigned int total_frames_rendered; //

  unsigned int highest_jobnum;

} general_info;

/*

  internally defined funcs's prototypes

*/

void status_report_generator(struct distrenjob **distrenjobs_head);

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

struct distrenjob *distrenjob_get(struct distrenjob *head, jobnum_t jobnum);

/* Global Vars, try to cut down on these */

jobnum_t jobnum = 0; // The next job number to create in the queue

int hcfjob; // Highest consecutively finished job

int highest_jobnum; // The job number of the most recently created job, this is used when creating new jobs

/* ********************** Functions ************************* */

/** Dumps all data in RAM to an xml file (such as current jobs, etc) which is parsed by start_data. Remember to invoke this before shutting down! */

int xml_dump()

{

  return 0;

}

/**

   Performs command stored in a client's request.

*/

int distrend_do()

{

  return 0;

}

/**

   Accepts a client's connection

 */

void distrend_accept()

{

}

/**

   Frees the action

*/

void distrend_action_free()

{

}

/**

   Start listening

*/

void distrend_listen()

{

}

/**

   Stop listening

*/

void distrend_unlisten()

{

}

/**

   This is probably just a placeholder for remotio

*/

void remotio_send_to_client()

{

	// I am futile!

}

/** 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 *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?

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

}

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

void queue(int type, char *name, char *submitter, char *email, int priority, int start_frame, int end_frame){

  struct distrenjob *distrenjob;

  distrenjob->type = 1; /*@TODO: add type to blendjob struct*/

  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

  /* @TODO: what does this do? frameset array is declared above */

  /*

  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" */

  int counter2 = start_frame;

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

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

    counter2++;

  }

  /* @TODO: change frame_num_struct_builder to add_blendjob_to_queue */

  add_job_to_queue(distrenjob);

  general_info.jobs_in_queue++;

}

/** -- OLD -- Queuer: Adds files to the queue

int queue(struct distrenjob *distrenjob, int type, char *name, char *submitter, char *email, int priority, int mode, int spp, struct frameset *frameset) {

  // Type: 1 = blender, add more types later

  // jobnum is the next available job number

  if(type == 1){

    distrenjob->name = name;

    distrenjob->submitter = submitter;

    distrenjob->email = email;

    distrenjob->priority = priority;

    distrenjob->frameset = frameset;

  }

  else{

    // Throw error.

    fprintf(stderr,"You tried to queue a job type that isn't supported by this version of DistRen.\nI have no idea how this would happen, but it just did.\n");

    return 0; // fail

  }

jobnum++; // Advance the jobnumber for the next queued job

return 0; // OK

}*/

/**

  Status Report Generator:

  -figures out how much of the job is done, where jobnum corresponds to the job number

  -removes finished jobs

  @param distrenjobs_head a pointer to a pointer because the head of the distrenjobs linked list may need to be changed by distrenjob_remove

*/

void status_report_generator(struct distrenjob **distrenjobs_head)

{

  struct distrenjob *distrenjob_ptr;

  unsigned short workers_working; /*< used to count the total number of workers working */

  unsigned int numjobs; /*< used to track number of jobs */

  distrenjob_ptr = *distrenjobs_head;

  workers_working = 0;

	      distrenjob_ptr->priority = 0; /*< set priority to zero to indicate job is complete */

	      distrenjob_remove(distrenjobs_head, distrenjob_ptr); /*< remove this job from the linkedlist */

	      general_info.total_finished_jobs++; /*< add one to the total finished jobs */

	    }

	  else if (finished_frames > distrenjob_ptr->total_frames)

	    /* just in case ;-) */

	    {

	      fprintf(stderr, "%s:%d: finished_frames (%lu) > distrenjob_ptr->total_frames (%d)",

		      __FILE__, __LINE__,

		      finished_frames,

		      distrenjob_ptr->total_frames);

	      abort();

	    }

	}

      general_info.rendering_clients = workers_working; /*< should this be a +=? */

      distrenjob_ptr = distrenjob_ptr->next; /*< This is the essence of linked lists and iterating through them */

      numjobs ++;

    } /* while(distrenjob_ptr) */

  general_info.jobs_in_queue = (highest_jobnum - general_info.total_finished_jobs); /*< extraneous parentheses! */

}

/** Structure Builder: This function creates frame array based on the total number of frames to be rendered, which will then be parsed by function frame_farmer. */

void add_job_to_queue(struct distrenjob *job) {

  struct distrenjob *prev_job = head; // create pointer to previous job

  struct distrenjob *current_job;     // create pointer to current_job (which job is being compared to)

  // iterate through linked list of jobs

  for(current_job = head; current_job != NULL; current_job = current_job->next){

    if(current_job == NULL){ // if it has reached the end of the list, add job there

      current_job = job;

      break;

    }

    else if(job->priority < current_job->priority){ // if job's priority is less than current_job's priority, insert job

      prev_job->next = job;                        // keep in mind 1 is the lowest priority

      job->next = current_job;

      break;

    }

    prev_job = current_job;

  } // end of for statement

}

void change_job_priority(int jobnum, int new_priority){

  job->priority = new_priority;

  add_job_to_queue(job);

}

  struct distrenjob *job;

  struct distrenjob *prev_job = head;

  for(job = head; job != NULL; job = job->next){

    if(job == NULL){

      return NULL;

    }

    if(job->jobnum = jobnum_t){

      prev_job = job->next;

      return job;

    }

    prev_job = job;

  }

  // job was not found if this point is reached

  return NULL;

}

/**

  Frame Finder: matches your computer up with a lovely frame to render

  TODO: Major issue here, the client needs to know the frame number, AND the job number!

  Notice that this function starts by looking at the oldest job first

	TODO: Link this up with the main() function to check if there are frames available or not and provide jobnum/framenum to the client

  @return 0 success, other: error

*/

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

  int your_job;	   // @TODO: Fixme: do we need this var? you_job is an integer value that must ALSO be given to the client

  unsigned short int found;

  unsigned short int priority;

  struct distrenjob *distrenjob_ptr;

  found = 0;

  while(!found)

    {

      /* enumerate through priority levels */

      for(priority = 10;

        priority > 0

            && !found;

           priority --)