/* Copyright (c) 2002,2003,2004,2009 James M. Kretchmar
 *
 * This file is part of Owl.
 *
 * Owl is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Owl 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Owl.  If not, see <http://www.gnu.org/licenses/>.
 *
 * ---------------------------------------------------------------
 * 
 * As of Owl version 2.1.12 there are patches contributed by
 * developers of the branched BarnOwl project, Copyright (c)
 * 2006-2009 The BarnOwl Developers. All rights reserved.
 */

#include "owl.h"

static const char fileIdent[] = "$Id$";

void owl_history_init(owl_history *h)
{
  owl_list_create(&(h->hist));
  h->cur=0;			/* current position in history */
  h->touched=0;			/* whether we've gone into history */
  h->partial=0;			/* is the 0th element is partially composed? */
  h->repeats=1;                 /* by default we'll allow repeat entries */
}

void owl_history_set_norepeats(owl_history *h)
{
  h->repeats=0;
}

char *owl_history_get_prev(owl_history *h)
{

  if (!h) return NULL;
  h->touched=1;

  if (owl_list_get_size(&(h->hist))==0) return(NULL);

  if (h->cur == owl_list_get_size(&(h->hist))-1) {
    return(NULL);
  }

  h->cur++;

  return(owl_list_get_element(&(h->hist), h->cur));
}

char *owl_history_get_next(owl_history *h)
{
  if (!h) return NULL;
  if (owl_list_get_size(&(h->hist))==0) return(NULL);
  if (h->cur==0) {
    return(NULL);
  }

  h->cur--;
  return(owl_list_get_element(&(h->hist), h->cur));
}

void owl_history_store(owl_history *h, char *line)
{
  int size;

  if (!h) return;
  size=owl_list_get_size(&(h->hist));

  /* if partial is set, remove the first entry first */
  if (h->partial) {
    owl_list_remove_element(&(h->hist), 0);
  }

  /* if repeats are disallowed, check if the line is the same as the last */
  if (owl_list_get_size(&(h->hist))>0) {
    if (!strcmp(line, owl_list_get_element(&(h->hist), 0))) return;
  }

  /* if we've reached the max history size, pop off the last element */
  if (size>OWL_HISTORYSIZE) {
    owl_free(owl_list_get_element(&(h->hist), size-1));
    owl_list_remove_element(&(h->hist), size-1);
  }

  /* add the new line */
  owl_list_prepend_element(&(h->hist), owl_strdup(line));
}

void owl_history_set_partial(owl_history *h)
{
  if (!h) return;
  h->partial=1;
}

void owl_history_reset(owl_history *h)
{
  if (!h) return;
  h->cur=0;
  h->touched=0;
  h->partial=0;
}

int owl_history_is_touched(owl_history *h)
{
  if (!h) return(0);
  if (h->touched) return(1);
  return(0);
}