/****************************************************************************
  
  GLUI User Interface Toolkit
  ---------------------------

     glui_commandline.cpp - GLUI_CommandLine control class


      --------------------------------------------------

  Copyright (c) 1998 Paul Rademacher, 2005 William Baxter

  This library is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation; either version 2.1 of the
  License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA

  This program is -not- in the public domain.

*****************************************************************************/

#include "glui.h"
#include "glui_internal.h"

/****************************** GLUI_CommandLine::GLUI_CommandLine() **********/
GLUI_CommandLine::GLUI_CommandLine( GLUI_Node *parent, const char *name, 
                                    void *data, int id, GLUI_CB cb )
{
  common_init();
  set_name( name );
    
  data_type   = GLUI_EDITTEXT_TEXT;
  ptr_val     = data;
  user_id     = id;
  callback    = cb;
    
  live_type = GLUI_LIVE_TEXT;

  parent->add_control( this );

  init_live();
}

/****************************** GLUI_CommandLine::key_handler() **********/

int    GLUI_CommandLine::key_handler( unsigned char key,int modifiers )
{
  int ret;

  if ( NOT glui )
    return false;

  if ( debug )
    dump( stdout, "-> CMD_TEXT KEY HANDLER" );

  if ( key == 13 ) {           /* RETURN */
    commit_flag = true;
  }

  ret = Super::key_handler( key, modifiers );

  if ( debug )
    dump( stdout, "<- CMD_TEXT KEY HANDLER" );

  return ret;
}


/****************************** GLUI_CommandLine::deactivate() **********/

void    GLUI_CommandLine::deactivate( void )
{
  // if the commit_flag is set, add the current command to 
  // history and call deactivate as normal

  // Trick deactivate into calling callback if and only if commit_flag set.
  // A bit subtle, but deactivate checks that orig_text and text
  // are the same to decide whether or not to call the callback.
  // Force them to be different for commit, and the same for no commit.
  if (commit_flag) {
    add_to_history(text.c_str());
    orig_text = "";
    Super::deactivate( );
    set_text( "" );
    commit_flag = false;
  }
  else {
    orig_text = text;
  }
}

/**************************** GLUI_CommandLine::special_handler() **********/

int    GLUI_CommandLine::special_handler( int key,int modifiers )
{
  if ( NOT glui )
    return false;
  
  if ( debug )
    printf( "CMD_TEXT SPECIAL:%d - mod:%d   subs:%d/%d  ins:%d  sel:%d/%d\n", 
	    key, modifiers, substring_start, substring_end,insertion_pt,
	    sel_start, sel_end );	 

  if ( key == GLUT_KEY_UP )  // PREVIOUS HISTORY
  {
    scroll_history(-1);
  }
  else if ( key == GLUT_KEY_DOWN )  // NEXT HISTORY
  {
    scroll_history(+1);
  }
  else {
    return Super::special_handler( key, modifiers );
  }
  return false;
}



/**************************** GLUI_CommandLine::scroll_history() ********/

void    GLUI_CommandLine::scroll_history( int direction )
{
  recall_history(curr_hist + direction);
}

/**************************** GLUI_CommandLine::recall_history() ********/

void    GLUI_CommandLine::recall_history( int hist_num )
{
  if (hist_num < oldest_hist OR
      hist_num > newest_hist OR
      hist_num == curr_hist)
    return;

  // Commit the current text first before we blow it away!
  if (curr_hist == newest_hist) {
    get_history_str(newest_hist) = text;
  }

  curr_hist = hist_num;
  set_text(get_history_str(curr_hist));
  sel_end = sel_start = insertion_pt = (int)text.length();
  update_and_draw_text();
}

/**************************** GLUI_CommandLine::add_to_history() ********/

void    GLUI_CommandLine::add_to_history( const char *cmd )
{
  if (cmd[0]=='\0') return; // don't add if it's empty

  curr_hist = newest_hist;
  get_history_str(newest_hist) = text;

  newest_hist = ++curr_hist;
  if ( newest_hist >= HIST_SIZE )
  {
    // bump oldest off the list
    hist_list.erase(hist_list.begin());
    hist_list.push_back("");

    oldest_hist++;
  }
}

/**************************** GLUI_CommandLine::reset_history() ********/

void    GLUI_CommandLine::reset_history( void )
{
  oldest_hist = newest_hist = curr_hist = 0;
}



/*************************************** GLUI_CommandLine::dump() **************/

void   GLUI_CommandLine::dump( FILE *out, const char *name )
{
  fprintf( out, 
	   "%s (commandline@%p):  ins_pt:%d  subs:%d/%d  sel:%d/%d   len:%d\n",
	   name, this, 
	   insertion_pt, substring_start, substring_end, sel_start, sel_end,
	   (int)text.length());
}


