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// Basic FSF(FIRST Scheduling Framework) contract management
// S.Ha.R.K. Implementation
//=====================================================================

#include "fsf_contract.h"
#include "fsf_server.h"

#include <pthread.h>
#include <stdlib.h>

//#define FSF_DEBUG

int fsf_server_level;

int FSF_register_module(int server_level)
{

  printk("FSF Module\n");

  fsf_server_level = server_level;

  return 0;

}

/* Convert the contract specification to
 * budget parameters
 */
int set_SERVER_budget_from_contract
  (const fsf_contract_parameters_t *contract,
   int *budget)
{

  int local_scheduler_level = 0;

   switch (contract->local_scheduler_id) {
     case FSF_SCHEDULER_POSIX:
       local_scheduler_level = POSIXSTAR_register_level(fsf_server_level,5000,32);
       break;
     case FSF_SCHEDULER_EDF:
       local_scheduler_level = EDFSTAR_register_level(fsf_server_level);
       break;
     case FSF_SCHEDULER_RM:
       local_scheduler_level = RMSTAR_register_level(fsf_server_level);
       break;
   }    
 
  *budget = SERVER_setbudget(fsf_server_level,
                              TIMESPEC2USEC(&(contract->budget_min)),
                              TIMESPEC2USEC(&(contract->period_max)),
                              local_scheduler_level,contract->local_scheduler_id);

  return 0;

}

int adjust_SERVER_budget_from_contract
  (const fsf_contract_parameters_t *contract,
   int budget)
{

  SERVER_adjust_budget(fsf_server_level, 
                       TIMESPEC2USEC(&(contract->budget_min)),
                       TIMESPEC2USEC(&(contract->period_max)),
                       budget);

  return 0;

}

/* Admission Test function */
int add_contract(const fsf_contract_parameters_t *contract)
{

  return 0;

}

int link_contract_to_server(const fsf_contract_parameters_t *contract,
                            fsf_server_id_t server)
{

  return 0;

}

int remove_contract(fsf_server_id_t server)
{

  return 0;

}


int fsf_negotiate_contract
  (const fsf_contract_parameters_t *contract,
   fsf_server_id_t                 *server)
{
  
  /* Check if contract is initialized */
  if (!contract) return FSF_ERR_NOT_INITIALIZED;

  /* Admission Test */
  if (FSF_ADMISSION_TEST_IS_ENABLED)
    if (add_contract(contract))
      return FSF_ERR_CONTRACT_REJECTED; 

  /* SERVER => BUDGET */    
  set_SERVER_budget_from_contract(contract,server);

  #ifdef FSF_DEBUG
    kern_printf("(New Server %d)",*server);
  #endif

  if (*server >= 0) 
    link_contract_to_server(contract,*server);
  else
    return FSF_ERR_CREATE_SERVER;

  return 0;

}

int fsf_create_thread
  (fsf_server_id_t    server,
   pthread_t         *thread,
   pthread_attr_t    *attr,
   fsf_thread_code_t  thread_code,
   void              *arg,
   void              *local_scheduler_arg)
{

  NRT_TASK_MODEL nrt;
  int local_scheduler_level,scheduler_id;

  #ifdef FSF_DEBUG 
    kern_printf("(FSF:Insert thread = %d to Server = %d)",*thread,server);
  #endif

  /* Check if server and thread exsist */
  if (server == NIL)
    return FSF_ERR_INVALID_SERVER;

  local_scheduler_level = SERVER_get_local_scheduler_level_from_budget(fsf_server_level,server);
  scheduler_id = SERVER_get_local_scheduler_id_from_budget(fsf_server_level,server);

  /* Check if thread is already bind */
  switch (scheduler_id) {
    case FSF_SCHEDULER_POSIX:

      if (local_scheduler_arg == NULL) {
        nrt_task_default_model(nrt);
        nrt_task_def_save_arrivals(nrt);
        nrt_task_def_arg(nrt,arg);
        nrt_task_def_ctrl_jet(nrt);
        nrt_task_def_level(nrt,local_scheduler_level);

        *thread = task_create("POSIXSTAR", thread_code, &nrt, NULL);
      }
      if (*thread == NIL) {
        #ifdef FSF_DEBUG
          kern_printf("(FSF:Error creating thread)");
        #endif
        return FSF_ERR_CREATE_THREAD;
      }

      POSIXSTAR_setbudget(local_scheduler_level, *thread, (int)(server));

      task_activate(*thread);

    break;
    case FSF_SCHEDULER_EDF:

      hard_task_def_arg(*(HARD_TASK_MODEL *)(local_scheduler_arg),arg);
      hard_task_def_level(*(HARD_TASK_MODEL *)(local_scheduler_arg),local_scheduler_level);

      *thread = task_create("EDFSTAR", thread_code, local_scheduler_arg, NULL);
      if (*thread == NIL)
        return FSF_ERR_CREATE_THREAD;

      EDFSTAR_setbudget(local_scheduler_level, *thread, (int)(server));

      task_activate(*thread);

      break;

    case FSF_SCHEDULER_RM:

      hard_task_def_arg(*(HARD_TASK_MODEL *)(local_scheduler_arg),arg);
      hard_task_def_level(*(HARD_TASK_MODEL *)(local_scheduler_arg),local_scheduler_level);

      *thread = task_create("RMSTAR", thread_code, local_scheduler_arg, NULL);
      if (*thread == NIL)
        return FSF_ERR_CREATE_THREAD;

      RMSTAR_setbudget(local_scheduler_level, *thread, (int)(server));

      task_activate(*thread);

      break;
    default:
      return FSF_ERR_INVALID_SERVER;
      break;
  }

  return 0;
  
}

int fsf_get_server
  (fsf_server_id_t *server,
   pthread_t       thread)
{
  int local_scheduler_level, scheduler_id;

  local_scheduler_level = SERVER_get_local_scheduler_level_from_pid(fsf_server_level,thread);
  scheduler_id = SERVER_get_local_scheduler_id_from_pid(fsf_server_level, thread);

  switch (scheduler_id) {
    case FSF_SCHEDULER_POSIX:  
      return POSIXSTAR_getbudget(local_scheduler_level,thread);
    case FSF_SCHEDULER_EDF:
      return EDFSTAR_getbudget(local_scheduler_level,thread);
    case FSF_SCHEDULER_RM:
      return RMSTAR_getbudget(local_scheduler_level,thread);
    default:
      return -1;
  }

  return -1;

}

int fsf_cancel_contract
  (fsf_server_id_t *server)
{

  int local_scheduler_level, scheduler_id;

  #ifdef FSF_DEBUG
    kern_printf("(Remove server %d)",*server);
  #endif

  /* Check server id */
  if (*server < 0)
    return FSF_ERR_INVALID_SERVER;

  local_scheduler_level = SERVER_get_local_scheduler_level_from_budget(fsf_server_level,*server);
  scheduler_id = SERVER_get_local_scheduler_id_from_budget(fsf_server_level,*server);

  switch (scheduler_id) {
    case FSF_SCHEDULER_POSIX:
  
      /* Check if some thread use the server */
      if(POSIXSTAR_budget_has_thread(local_scheduler_level,*server))
        return FSF_ERR_SERVER_USED;
 
      break;
    case FSF_SCHEDULER_EDF:
      /* Check if some thread use the server */
      if(EDFSTAR_budget_has_thread(local_scheduler_level,*server))
        return FSF_ERR_SERVER_USED;
      break;

    case FSF_SCHEDULER_RM:
      /* Check if some thread use the server */
      if(RMSTAR_budget_has_thread(local_scheduler_level,*server))
        return FSF_ERR_SERVER_USED;

      break;
  }

  SERVER_removebudget(fsf_server_level,*server);

  level_free_descriptor(local_scheduler_level); 

  remove_contract(*server);

  *server = -1;

  return 0;

}

int fsf_renegotiate_contract
  (const fsf_contract_parameters_t *new_contract,
   fsf_server_id_t server)
{

  #ifdef FSF_DEBUG
    kern_printf("(Renegotiate for server %d)",server);
  #endif

  if (!new_contract)
    return FSF_ERR_NOT_INITIALIZED;

  if (server < 0)
    return FSF_ERR_INVALID_SERVER;

  return adjust_SERVER_budget_from_contract(new_contract,server);

}