#include "project.h"

#ifdef MAP_NULL

void
map_output (int *computer, int *x, int *y)
{
  (*computer)--;
}

#elif defined(MAP_HOME)

void
map_output (int *computer, int *x, int *y)
{

  switch (*computer)
    {
    case 1:
      *computer = 5;
      break;
    case 2:
      *computer = 4;
      break;
    case 3:
      *computer = 0;
      if (x)
        *x = *x / 2;
      break;
    case 4:
      *computer = 0;
      if (x)
        *x = (*x / 2) + 1024;
      break;
    case 5:
    case 6:
    case 7:
      (*computer) -= 4;
      break;
    }
}

#endif

int
map_grace_left (int computer)
{
  int console = layout_computer_to_console (computer);
  int cl = layout_console_to_computer (console - 1);

  if ((cl < 1) || (cl > N_COMPUTER))
    return 1;

  map_output (&computer, NULL, NULL);
  map_output (&cl, NULL, NULL);

  return cl != computer;
}

int
map_grace_right (int computer)
{
  int console = layout_computer_to_console (computer);
  int cl = layout_console_to_computer (console + 1);
  if ((cl < 1) || (cl > N_COMPUTER))
    return 1;

  map_output (&computer, NULL, NULL);
  map_output (&cl, NULL, NULL);

  return cl != computer;
}

int
map_switch_left (int *cc)
{
  int computer;
  int console;
  int ok;

  for (computer = *cc - 1; computer > 0; computer--)
    {

/* First see if this computer is being displayed  - if so easy*/

      if (layout_computer_to_console (computer) > 0)
        {
          *cc = computer;
          layout_status (*cc);
          return 1;
        }

/* We're switching left so try console from the left to the right */
      ok = 0;

      for (console = 1; console <= N_CONSOLE; ++console)
        {
          if (layout_possible (console, computer))
            {
              layout_map (console, computer);
              if (!ok)
                *cc = computer;
              computer++;
              ok++;
            }
        }
      if (ok)
        {
          layout_status (*cc);
          return 1;
        }
    }


  return 0;
}

int
map_switch_right (int *cc)
{
  int computer;
  int console;
  int ok;


  for (computer = *cc + 1; computer <= N_COMPUTER; computer++)
    {

/* First see if this computer is being displayed  - if so easy*/

      if (layout_computer_to_console (computer) > 0)
        {
          *cc = computer;
          layout_status (*cc);
          return 1;
        }

/* We're switching right so try console from the left to the right */
      ok = 0;

      for (console = N_CONSOLE; console > 0; --console)
        {
          if (layout_possible (console, computer))
            {
              layout_map (console, computer);
              if (!ok)
                *cc = computer;

              computer--;
              ok++;
            }
        }
      if (ok)
        {
          layout_status (*cc);
          return 1;
        }
    }


  return 0;
}

int
map_init (void)
{
  return layout_init ();
}