/*
 * $Id: session_manager.c 44 2011-02-15 12:32:29Z kaori $
 *
 * Copyright (c) 2002-2011, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
 * Copyright (c) 2002-2011, Professor Benoit Macq
 * Copyright (c) 2010-2011, Kaori Hagihara
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "session_manager.h"
#include "target_manager.h"

#ifdef SERVER
#include "fcgi_stdio.h"
#define logstream FCGI_stdout
#else
#define FCGI_stdout stdout
#define FCGI_stderr stderr
#define logstream stderr
#endif /*SERVER */


sessionlist_param_t * gene_sessionlist(void)
{
  sessionlist_param_t *sessionlist;

  sessionlist = (sessionlist_param_t *)malloc( sizeof(sessionlist_param_t));
  
  sessionlist->first = NULL;
  sessionlist->last  = NULL;

  return sessionlist;
}

session_param_t * gene_session( sessionlist_param_t *sessionlist)
{
  session_param_t *session;
  
  session = (session_param_t *)malloc( sizeof(session_param_t));

  session->channellist = gene_channellist();
  session->cachemodellist = gene_cachemodellist();

  session->next = NULL;
  
  if( sessionlist->first) /* there are one or more entries */
    sessionlist->last->next = session;
  else                   /* first entry */
    sessionlist->first = session;
  sessionlist->last = session;
  
  return session;
}

bool search_session_and_channel( char cid[], 
				 sessionlist_param_t *sessionlist, 
				 session_param_t **foundsession, 
				 channel_param_t **foundchannel)
{
  *foundsession = sessionlist->first;
  
  while( *foundsession != NULL){

    *foundchannel = (*foundsession)->channellist->first;
    
    while( *foundchannel != NULL){
      
      if( strcmp( cid, (*foundchannel)->cid) == 0)
	return true;
      
      *foundchannel = (*foundchannel)->next;
    }
    *foundsession = (*foundsession)->next;
  }
  
  fprintf( FCGI_stdout, "Status: 503\r\n");
  fprintf( FCGI_stdout, "Reason: Channel %s not found\r\n", cid); 

  return false;
}

void insert_cachemodel_into_session( session_param_t *session, cachemodel_param_t *cachemodel)
{
  if(!cachemodel)
    return;

#ifndef SERVER
  fprintf( logstream, "local log: insert cachemodel into session\n");
#endif
  if( session->cachemodellist->first != NULL)
    session->cachemodellist->last->next = cachemodel;
  else
    session->cachemodellist->first = cachemodel;
  session->cachemodellist->last = cachemodel;
}

bool delete_session( session_param_t **session, sessionlist_param_t *sessionlist)
{
  session_param_t *ptr;

  if( *session == NULL)
    return false;


  if( *session == sessionlist->first)
    sessionlist->first = (*session)->next;
  else{
    ptr = sessionlist->first;
    while( ptr->next != *session)
      ptr = ptr->next;
    ptr->next = (*session)->next;

    if( *session == sessionlist->last)
      sessionlist->last = ptr;
  }
  
  delete_channellist( &((*session)->channellist));
  delete_cachemodellist( &((*session)->cachemodellist));

#ifndef SERVER
  fprintf( logstream, "local log: session: %p deleted!\n", (void *)(*session));
#endif
  free( *session);

  return true;
}

void delete_sessionlist( sessionlist_param_t **sessionlist)
{  
  session_param_t *sessionPtr, *sessionNext;

  sessionPtr = (*sessionlist)->first;
  while( sessionPtr != NULL){
    sessionNext=sessionPtr->next;

    delete_channellist( &(sessionPtr->channellist));
    delete_cachemodellist( &(sessionPtr->cachemodellist));

#ifndef SERVER
    fprintf( logstream, "local log: session: %p deleted!\n", (void *)sessionPtr);
#endif
    free( sessionPtr);

    sessionPtr=sessionNext;
  }

  (*sessionlist)->first = NULL;
  (*sessionlist)->last  = NULL;

  free(*sessionlist);
}

void print_allsession( sessionlist_param_t *sessionlist)
{
  session_param_t *ptr;
  cachemodel_param_t *cachemodel;
  int i=0;

  fprintf( logstream, "SESSIONS info:\n");

  ptr = sessionlist->first;
  while( ptr != NULL){
    fprintf( logstream, "session No.%d\n", i++);
    print_allchannel( ptr->channellist);
    cachemodel = ptr->cachemodellist->first;
    while( cachemodel){
      print_target( cachemodel->target);
      cachemodel = cachemodel->next;
    }
    ptr=ptr->next;
  }
}