/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 1996  Erich Boleyn  <erich@uruk.org>
 *  Copyright (C) 2000  Free Software Foundation, Inc.
 *
 *  This program 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 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "shared.h"

grub_jmp_buf restart_env;

static char *
get_entry (char *list, int num, int nested)
{
  int i;

  for (i = 0; i < num; i++)
    {
      do
	{
	  while (*(list++));
	}
      while (nested && *(list++));
    }

  return list;
}


static void
print_entries (int y, int size, int first, char *menu_entries)
{
  int i;

  gotoxy (77, y + 1);

  if (first)
    putchar (DISP_UP);
  else
    putchar (' ');

  menu_entries = get_entry (menu_entries, first, 0);

  for (i = 1; i <= size; i++)
    {
      int j = 0;

      gotoxy (3, y + i);

      while (*menu_entries)
	{
	  if (j < 71)
	    {
	      putchar (*menu_entries);
	      j++;
	    }

	  menu_entries++;
	}

      if (*(menu_entries - 1))
	menu_entries++;

      for (; j < 71; j++)
	putchar (' ');
    }

  gotoxy (77, y + size);

  if (*menu_entries)
    putchar (DISP_DOWN);
  else
    putchar (' ');
}


static void
print_border (int y, int size)
{
  int i;

#ifndef GRUB_UTIL
  /* Color the menu. The menu is 75 * 14 characters.  */
  for (i = 0; i < 14; i++)
    {
      int j;
      for (j = 0; j < 75; j++)
	{
	  gotoxy (j + 1, i + y);
	  set_attrib (normal_color);
	}
    }
#endif

  gotoxy (1, y);

  putchar (DISP_UL);
  for (i = 0; i < 73; i++)
    putchar (DISP_HORIZ);
  putchar (DISP_UR);

  i = 1;

  while (1)
    {
      gotoxy (1, y + i);

      if (i > size)
	break;

      putchar (DISP_VERT);
      gotoxy (75, y + i);
      putchar (DISP_VERT);

      i++;
    }

  putchar (DISP_LL);
  for (i = 0; i < 73; i++)
    putchar (DISP_HORIZ);
  putchar (DISP_LR);
}

static void
set_line (int y, int attr)
{
  int x;

  for (x = 2; x < 75; x++)
    {
      gotoxy (x, y);
      set_attrib (attr);
    }
}

/* Set the attribute of the line Y to normal state.  */
static void
set_line_normal (int y)
{
#ifdef GRUB_UTIL
  set_line (y, A_NORMAL);
#else
  set_line (y, normal_color);
#endif
}

/* Set the attribute of the line Y to highlight state.  */
static void
set_line_highlight (int y)
{
#ifdef GRUB_UTIL
  set_line (y, A_REVERSE);
#else
  set_line (y, highlight_color);
#endif
}

static void
run_menu (char *menu_entries, char *config_entries, int num_entries,
	  char *heap, int entryno)
{
  int c, time1, time2 = -1, first_entry = 0;
  char *cur_entry;

  /*
   *  Main loop for menu UI.
   */

restart:
  while (entryno > 11)
    {
      first_entry++;
      entryno--;
    }

  init_page ();
#ifndef GRUB_UTIL
  nocursor ();
#endif

  print_border (3, 12);

#ifdef GRUB_UTIL
  grub_printf ("\n
      Use the up and down arrows for selecting which entry is highlighted.\n");
#else
  grub_printf ("\n
      Use the %c and %c keys for selecting which entry is highlighted.\n",
	  DISP_UP, DISP_DOWN);
#endif

  if (! auth && password)
    {
      printf ("       Press enter to boot the selected OS or \'p\' to enter a
        password to unlock the next set of features.");
    }
  else
    {
      if (config_entries)
	printf ("       Press enter to boot the selected OS, \'e\' to edit the
        commands before booting, or \'c\' for a command-line.");
      else
	printf (
"      Press \'b\' to boot, \'e\' to edit the selected command in the
      boot sequence, \'c\' for a command-line, \'o\' to open a new line
      after (\'O\' for before) the selected line, \'d\' to remove the
      selected line, or escape to go back to the main menu.");
    }

  print_entries (3, 12, first_entry, menu_entries);

  /* highlight initial line */
  set_line_highlight (4 + entryno);

  /* XX using RT clock now, need to initialize value */
  while ((time1 = getrtsecs()) == 0xFF);

  while (1)
    {
      /* initilize to NULL just in case... */
      cur_entry = NULL;

      if (grub_timeout >= 0 && (time1 = getrtsecs()) != time2 && time1 != 0xFF)
	{
	  if (grub_timeout <= 0)
	    {
	      grub_timeout = -1;
	      break;
	    }

	  /* else not booting yet! */
	  time2  = time1;
	  gotoxy (3, 22);
	  printf ("The highlighted entry will be booted automatically in %d seconds.    ", grub_timeout);
	  gotoxy (74, 4 + entryno);
	  grub_timeout--;
	}

      if (checkkey () != -1)
	{
	  c = getkey ();

	  if (grub_timeout >= 0)
	    {
	      gotoxy (3, 22);
	      printf ("                                                                    ");
	      grub_timeout = -1;
	      fallback_entry = -1;
	      gotoxy (74, 4 + entryno);
	    }

	  if ((c == KEY_UP) || (ASCII_CHAR (c) == 16))
	    {
	      if (entryno > 0)
		{
		  set_line_normal (4 + entryno);
		  entryno--;
		  set_line_highlight (4 + entryno);
		}
	      else if (first_entry > 0)
		{
		  first_entry--;
		  print_entries (3, 12, first_entry, menu_entries);
		  set_line_highlight (4);
		}
	    }
	  if (((c == KEY_DOWN) || (ASCII_CHAR (c) == 14))
	      && (first_entry + entryno + 1) < num_entries)
	    {
	      if (entryno < 11)
		{
		  set_line_normal (4 + entryno);
		  entryno++;
		  set_line_highlight (4 + entryno);
		}
	      else if (num_entries > 12 + first_entry)
		{
		  first_entry++;
		  print_entries (3, 12, first_entry, menu_entries);
		  set_line_highlight (15);
		}
	    }

	  c = ASCII_CHAR (c);

	  if (config_entries)
	    {
	      if ((c == '\n') || (c == '\r'))
		break;
	    }
	  else
	    {
	      if ((c == 'd') || (c == 'o') || (c == 'O'))
		{
		  set_line_normal (4 + entryno);

		  /* insert after is almost exactly like insert before */
		  if (c == 'o')
		    {
		      /* But `o' differs from `O', since it may causes
			 the menu screen to scroll up.  */
		      if (entryno < 11)
			entryno++;
		      else
			first_entry++;
		      
		      c = 'O';
		    }

		  cur_entry = get_entry (menu_entries,
					 first_entry + entryno,
					 0);

		  if (c == 'O')
		    {
		      memmove (cur_entry + 2, cur_entry,
			       ((int) heap) - ((int) cur_entry));

		      cur_entry[0] = ' ';
		      cur_entry[1] = 0;

		      heap += 2;

		      num_entries++;
		    }
		  else if (num_entries > 0)
		    {
		      char *ptr = get_entry(menu_entries,
					    first_entry + entryno + 1,
					    0);

		      memmove (cur_entry, ptr, ((int) heap) - ((int) ptr));
		      heap -= (((int) ptr) - ((int) cur_entry));

		      num_entries--;

		      if (entryno >= num_entries)
			entryno--;
		      if (first_entry && num_entries < 12 + first_entry)
			first_entry--;
		    }

		  print_entries (3, 12, first_entry, menu_entries);
		  set_line_highlight (4 + entryno);
		}

	      cur_entry = menu_entries;
	      if (c == 27)
		return;
	      if (c == 'b')
		break;
	    }

	  if (! auth && password)
	    {
	      if (c == 'p')
		{
		  /* Do password check here! */
		  char entered[32];
		  char *pptr = password;

		  gotoxy (1, 21);

		  /* Wipe out the previously entered password */
		  memset (entered, 0, sizeof (entered));
		  get_cmdline (" Password: ", entered, 31, '*', 0);

		  while (! isspace (*pptr) && *pptr)
		    pptr++;

		  /* Make sure that PASSWORD is NUL-terminated.  */
		  *pptr++ = 0;

		  if (! strcmp (password, entered))
		    {
		      char *new_file = config_file;
		      while (isspace (*pptr))
			pptr++;

		      /* If *PPTR is NUL, then allow the user to use
			 privileged instructions, otherwise, load
			 another configuration file.  */
		      if (*pptr != 0)
			{
			  while ((*(new_file++) = *(pptr++)) != 0)
			    ;

			  /* Make sure that the user will not have
			     authority in the next configuration.  */
			  auth = 0;
			  return;
			}
		      else
			{
			  /* Now the user is superhuman.  */
			  auth = 1;
			  goto restart;
			}
		    }
		  else
		    {
		      printf ("Failed!\n      Press any key to continue...");
		      getkey ();
		      goto restart;
		    }
		}
	    }
	  else
	    {
	      if (c == 'e')
		{
		  int num_entries = 0, i = 0;
		  char *new_heap;

		  if (config_entries)
		    {
		      new_heap = heap;
		      cur_entry = get_entry (config_entries,
					     first_entry + entryno,
					     1);
		    }
		  else
		    {
		      /* safe area! */
		      new_heap = heap + NEW_HEAPSIZE + 1;
		      cur_entry = get_entry (menu_entries,
					     first_entry + entryno,
					     0);
		    }

		  do
		    {
		      while ((*(new_heap++) = cur_entry[i++]) != 0);
		      num_entries++;
		    }
		  while (config_entries && cur_entry[i]);

		  /* this only needs to be done if config_entries is non-NULL,
		     but it doesn't hurt to do it always */
		  *(new_heap++) = 0;

		  if (config_entries)
		    run_menu (heap, NULL, num_entries, new_heap, 0);
		  else
		    {
		      cls ();
		      print_cmdline_message (0);

		      new_heap = heap + NEW_HEAPSIZE + 1;

		      saved_drive = boot_drive;
		      saved_partition = install_partition;
		      current_drive = 0xFF;

		      if (! get_cmdline (PACKAGE " edit> ", new_heap,
					 NEW_HEAPSIZE + 1, 0, 1))
			{
			  int j = 0;

			  /* get length of new command */
			  while (new_heap[j++])
			    ;

			  if (j < 2)
			    {
			      j = 2;
			      new_heap[0] = ' ';
			      new_heap[1] = 0;
			    }

			  /* align rest of commands properly */
			  memmove (cur_entry + j, cur_entry + i,
				   ((int) heap) - (((int) cur_entry) + i));

			  /* copy command to correct area */
			  memmove (cur_entry, new_heap, j);

			  heap += (j - i);
			}
		    }

		  goto restart;
		}
	      if (c == 'c')
		{
		  enter_cmdline (heap, 0);
		  goto restart;
		}
#ifdef GRUB_UTIL
	      if (c == 'q')
		{
		  /* The same as ``quit''.  */
		  stop ();
		}
#endif
	    }
	}
    }

  /*
   *  Attempt to boot an entry.
   */

  while (1)
    {
      cls ();

      if (config_entries)
	printf ("  Booting \'%s\'\n\n",
		get_entry (menu_entries, first_entry + entryno, 0));
      else
	printf ("  Booting command-list\n\n");

      if (! cur_entry)
	cur_entry = get_entry (config_entries, first_entry + entryno, 1);

      if (run_script (cur_entry, heap))
	{
	  if (fallback_entry < 0)
	    break;
	  else
	    {
	      cur_entry = NULL;
	      first_entry = 0;
	      entryno = fallback_entry;
	      fallback_entry = -1;
	    }
	}
      else
	break;
    }

  goto restart;
}


static int
get_line_from_config (char *cmdline, int maxlen)
{
  int pos = 0, literal = 0, comment = 0;
  char c;  /* since we're loading it a byte at a time! */

  while (grub_read (&c, 1))
    {
      /* translate characters first! */
      if (c == '\\' && ! literal)
	{
	  literal = 1;
	  continue;
	}
      if (c == '\r')
	continue;
      if ((c == '\t') || (literal && (c == '\n')))
	c = ' ';

      literal = 0;

      if (comment)
	{
	  if (c == '\n')
	    comment = 0;
	}
      else if (! pos)
	{
	  if (c == '#')
	    comment = 1;
	  else if ((c != ' ') && (c != '\n'))
	    cmdline[pos++] = c;
	}
      else
	{
	  if (c == '\n')
	    break;

	  if (pos < maxlen)
	    cmdline[pos++] = c;
	}
    }

  cmdline[pos] = 0;

  return pos;
}


/* This is the starting function in C.  */
void
cmain (void)
{
  int config_len, menu_len, num_entries;
  char *config_entries, *menu_entries;
  char *kill = (char *) KILL_BUF;

  /* Initialize the environment for restarting Stage 2.  */
  grub_setjmp (restart_env);
  
  /* Initialize the kill buffer.  */
  *kill = 0;

  /* Never return.  */
  for (;;)
    {
      config_len = 0;
      menu_len = 0;
      num_entries = 0;
      config_entries = (char *) (mbi.mmap_addr + mbi.mmap_length);
      menu_entries = (char *) MENU_BUF;
      init_config ();

      /* Here load the configuration file.  */

#ifdef GRUB_UTIL
      if (use_config_file && grub_open (config_file))
#else
      if (grub_open (config_file))
#endif
	{
	  /* STATE 0:  Before any title command.
	     STATE 1:  In a title command.
	     STATE >1: In a entry after a title command.  */
	  int state = 0, prev_config_len = 0, prev_menu_len = 0;
	  char *cmdline;

	  cmdline = (char *) CMDLINE_BUF;
	  while (get_line_from_config (cmdline, NEW_HEAPSIZE))
	    {
	      struct builtin *builtin;

	      /* Get the pointer to the builtin structure.  */
	      builtin = find_command (cmdline);
	      errnum = 0;
	      if (! builtin)
		/* Unknown command. Just skip now.  */
		continue;

	      if (builtin->flags & BUILTIN_TITLE)
		{
		  char *ptr;

		  /* the command "title" is specially treated.  */
		  if (state > 1)
		    {
		      /* The next title is found.  */
		      num_entries++;
		      config_entries[config_len++] = 0;
		      prev_menu_len = menu_len;
		      prev_config_len = config_len;
		    }
		  else
		    {
		      /* The first title is found.  */
		      menu_len = prev_menu_len;
		      config_len = prev_config_len;
		    }

		  /* Reset the state.  */
		  state = 1;

		  /* Copy title into menu area.  */
		  ptr = skip_to (1, cmdline);
		  while ((menu_entries[menu_len++] = *(ptr++)) != 0)
		    ;
		}
	      else if (! state)
		{
		  /* Run a command found is possible.  */
		  if (builtin->flags & BUILTIN_MENU)
		    {
		      char *arg = skip_to (1, cmdline);
		      (builtin->func) (arg, BUILTIN_MENU);
		      errnum = 0;
		    }
		  else
		    /* Ignored.  */
		    continue;
		}
	      else
		{
		  char *ptr = cmdline;

		  state++;
		  /* Copy config file data to config area.  */
		  while ((config_entries[config_len++] = *ptr++) != 0)
		    ;
		}
	    }

	  if (state > 1)
	    {
	      /* Finish the last entry.  */
	      num_entries++;
	      config_entries[config_len++] = 0;
	    }
	  else
	    {
	      menu_len = prev_menu_len;
	      config_len = prev_config_len;
	    }

	  menu_entries[menu_len++] = 0;
	  config_entries[config_len++] = 0;
	  grub_memmove (config_entries + config_len, menu_entries, menu_len);
	  menu_entries = config_entries + config_len;

	  grub_close ();
	}

      if (! num_entries)
	{
	  /* If no acceptable config file, goto command-line, starting
	     heap from where the config entries would have been stored
	     if there were any.  */
	  enter_cmdline (config_entries, 1);
	}
      else
	{
	  /* Run menu interface.  */
	  run_menu (menu_entries, config_entries, num_entries,
		    menu_entries + menu_len, default_entry);
	}
    }
}