/*      $NetBSD: driver.c,v 1.9 2003/03/09 01:08:48 lukem Exp $ */

/*-
 * Copyright (c) 1998-1999 Brett Lymn (blymn@baea.com.au, brett_lymn@yahoo.com.au)
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <sys/cdefs.h>
__RCSID("$NetBSD: driver.c,v 1.9 2003/03/09 01:08:48 lukem Exp $");

#include <menu.h>
#include <ctype.h>
#include <stdlib.h>
#include "internals.h"

/*
 * The guts of the menu library.  This function processes the character
 * in c and performs actions based on the value of the character.  If the
 * character is a normal one then the driver attempts to match the character
 * against the items.  If the character is a recognised request then the
 * request is processed by the driver, if the character is not a recognised
 * request and is not printable then it assumed to be a user defined command.
 */
int
menu_driver(MENU *menu, int c)
{
        int drv_top_row, drv_scroll, i, it, status = E_OK;
        ITEM *drv_new_item;

        i = 0;
        
        if (menu == NULL)
                return E_BAD_ARGUMENT;
        if (menu->posted == 0)
                return E_NOT_POSTED;
        if (menu->items == NULL)
                return E_NOT_CONNECTED;
        if (*menu->items == NULL)
                return E_NOT_CONNECTED;
        if (menu->in_init == 1)
                return E_BAD_STATE;

          /* this one should never happen but just in case.... */
        if (menu->items[menu->cur_item] == NULL)
                return E_SYSTEM_ERROR;

        drv_new_item = menu->items[menu->cur_item];
        it = menu->cur_item;
        drv_top_row = menu->top_row;
        
        if ((c > REQ_BASE_NUM) && (c <= MAX_COMMAND)) {
                  /* is a known driver request  - first check if the pattern
                   * buffer needs to be cleared, we do this on non-search
                   * type requests.
                   */
                if (! ((c == REQ_BACK_PATTERN) || (c == REQ_NEXT_MATCH) ||
                       (c == REQ_PREV_MATCH))) {
                        if ((c == REQ_CLEAR_PATTERN)
                            && (menu->pattern == NULL))
                                return E_REQUEST_DENIED;
                        free(menu->pattern);
                        menu->pattern = NULL;
                        menu->plen = 0;
                        menu->match_len = 0;
                }
                
                switch (c) {
                  case REQ_LEFT_ITEM:
                          drv_new_item = drv_new_item->left;
                          break;
                  case REQ_RIGHT_ITEM:
                          drv_new_item = drv_new_item->right;
                          break;
                  case REQ_UP_ITEM:
                          drv_new_item = drv_new_item->up;
                          break;
                  case REQ_DOWN_ITEM:
                          drv_new_item = drv_new_item->down;
                          break;
                  case REQ_SCR_ULINE:
                          if (drv_top_row == 0)
                                  return E_REQUEST_DENIED;
                          drv_top_row--;
                          drv_new_item = drv_new_item->up;
                          break;
                  case REQ_SCR_DLINE:
                          drv_top_row++;
                          if ((drv_top_row + menu->rows - 1)> menu->item_rows)
                                  return E_REQUEST_DENIED;
                          drv_new_item = drv_new_item->down;
                          break;
                  case REQ_SCR_DPAGE:
                          drv_scroll = menu->item_rows - menu->rows
                                  - menu->top_row;
                          if (drv_scroll > menu->rows) {
                                  drv_scroll = menu->rows;
                          }
                          
                          if (drv_scroll <= 0) {
                                  return E_REQUEST_DENIED;
                          } else {
                                  drv_top_row += drv_scroll;
                                  while (drv_scroll-- > 0)
                                          drv_new_item = drv_new_item->down;
                          }
                          break;
                  case REQ_SCR_UPAGE:
                          if (menu->rows < menu->top_row) {
                                  drv_scroll = menu->rows;
                          } else {
                                  drv_scroll = menu->top_row;
                          }
                          if (drv_scroll == 0)
                                  return E_REQUEST_DENIED;

                          drv_top_row -= drv_scroll;
                          while (drv_scroll-- > 0)
                                  drv_new_item = drv_new_item->up;
                          break;
                  case REQ_FIRST_ITEM:
                          drv_new_item = menu->items[0];
                          break;
                  case REQ_LAST_ITEM:
                          drv_new_item = menu->items[menu->item_count - 1];
                          break;
                  case REQ_NEXT_ITEM:
                          if ((menu->cur_item + 1) >= menu->item_count) {
                                  if ((menu->opts & O_NONCYCLIC)
                                      == O_NONCYCLIC) {
                                          return E_REQUEST_DENIED;
                                  } else {
                                          drv_new_item = menu->items[0];
                                  }
                          } else {
                                  drv_new_item =
                                          menu->items[menu->cur_item + 1];
                          }
                          break;
                  case REQ_PREV_ITEM:
                          if (menu->cur_item == 0) {
                                  if ((menu->opts & O_NONCYCLIC)
                                      == O_NONCYCLIC) {
                                          return E_REQUEST_DENIED;
                                  } else {
                                          drv_new_item = menu->items[
                                                  menu->item_count - 1];
                                  }
                          } else {
                                  drv_new_item =
                                          menu->items[menu->cur_item - 1];
                          }
                          break;
                  case REQ_TOGGLE_ITEM:
                          if ((menu->opts & (O_RADIO | O_ONEVALUE)) != 0) {
                              if ((menu->opts & O_RADIO) == O_RADIO) {
                                  if ((drv_new_item->opts & O_SELECTABLE)
                                                        != O_SELECTABLE)
                                          return E_NOT_SELECTABLE;

                                    /* don't deselect selected item */
                                  if (drv_new_item->selected == 1)
                                          return E_REQUEST_DENIED;
                                  
                                  /* deselect all items */
                                  for (i = 0; i < menu->item_count; i++) {
                                      if ((menu->items[i]->selected) &&
                                          (drv_new_item->index != i)) {
                                          menu->items[i]->selected ^= 1;
                                          _menui_draw_item(menu,
                                                menu->items[i]->index);
                                      }
                                  }

                                    /* turn on selected item */
                                  drv_new_item->selected ^= 1;
                                  _menui_draw_item(menu, drv_new_item->index);
                              } else {
                                  return E_REQUEST_DENIED;
                              }
                          } else {
                                  if ((drv_new_item->opts
                                       & O_SELECTABLE) == O_SELECTABLE) {
                                            /* toggle select flag */
                                          drv_new_item->selected ^= 1;
                                            /* update item in menu */
                                          _menui_draw_item(menu,
                                                drv_new_item->index);
                                  } else {
                                          return E_NOT_SELECTABLE;
                                  }
                          }
                          break;
                  case REQ_CLEAR_PATTERN:
                            /* this action is taken before the
                               case statement */
                          break;
                  case REQ_BACK_PATTERN:
                          if (menu->pattern == NULL)
                                  return E_REQUEST_DENIED;
                          
                          if (menu->plen == 0)
                                  return E_REQUEST_DENIED;
                          menu->pattern[menu->plen--] = '\0';
                          break;
                  case REQ_NEXT_MATCH:
                          if (menu->pattern == NULL)
                                  return E_REQUEST_DENIED;

                          status = _menui_match_pattern(menu, 0,
                                                         MATCH_NEXT_FORWARD,
                                                         &it);
                          drv_new_item = menu->items[it];
                          break;
                  case REQ_PREV_MATCH:
                          if (menu->pattern == NULL)
                                  return E_REQUEST_DENIED;

                          status = _menui_match_pattern(menu, 0,
                                                         MATCH_NEXT_REVERSE,
                                                         &it);
                          drv_new_item = menu->items[it];
                          break; 
                }
        } else if (c > MAX_COMMAND) {
                  /* must be a user command */
                return E_UNKNOWN_COMMAND;
        } else if (isprint((unsigned char) c)) {
                  /* otherwise search items for the character. */
                status = _menui_match_pattern(menu, (unsigned char) c,
                                               MATCH_FORWARD, &it);
                drv_new_item = menu->items[it];

                  /* update the position of the cursor if we are doing
                   * show match and the current item has not changed.  If
                   * we don't do this here it won't get done since the
                   * display will not be updated due to the current item
                   * not changing.
                   */
                if ((drv_new_item->index == menu->cur_item)
                    && ((menu->opts & O_SHOWMATCH) == O_SHOWMATCH)) {
                        pos_menu_cursor(menu);
                }
                
                            
        } else {
                  /* bad character */
                return E_BAD_ARGUMENT;
        }

        if (drv_new_item == NULL)
                return E_REQUEST_DENIED;

        if (drv_new_item->row < drv_top_row) drv_top_row = drv_new_item->row;
        if (drv_new_item->row >= (drv_top_row + menu->rows))
                drv_top_row = drv_new_item->row - menu->rows + 1;
        
        if ((drv_new_item->index != menu->cur_item)
            || (drv_top_row != menu->top_row))
                _menui_goto_item(menu, drv_new_item, drv_top_row);

        return status;
}