/***********************************************************
* Artsoft Retro-Game Library                               *
*----------------------------------------------------------*
* (c) 1995-2006 Artsoft Entertainment                      *
*               Holger Schemel                             *
*               Detmolder Strasse 189                      *
*               33604 Bielefeld                            *
*               Germany                                    *
*               e-mail: info@artsoft.org                   *
*----------------------------------------------------------*
* joystick.c                                               *
***********************************************************/

#include "joystick.h"
#include "misc.h"

#if defined(PLATFORM_FREEBSD)
#include <sys/joystick.h>
#endif


/* ========================================================================= */
/* platform dependent joystick functions                                     */
/* ========================================================================= */

#if defined(PLATFORM_UNIX) && !defined(TARGET_SDL)
void UnixInitJoysticks()
{
  static boolean unix_joystick_subsystem_initialized = FALSE;
  boolean print_warning = !unix_joystick_subsystem_initialized;
  int i;

  for (i = 0; i < MAX_PLAYERS; i++)
  {
    char *device_name = setup.input[i].joy.device_name;

    /* this allows subsequent calls to 'InitJoysticks' for re-initialization */
    if (joystick.fd[i] != -1)
    {
      close(joystick.fd[i]);
      joystick.fd[i] = -1;
    }

    if (!setup.input[i].use_joystick)
      continue;

    if (access(device_name, R_OK) != 0)
    {
      if (print_warning)
	Error(ERR_WARN, "cannot access joystick device '%s'", device_name);

      continue;
    }

    if ((joystick.fd[i] = open(device_name, O_RDONLY)) < 0)
    {
      if (print_warning)
	Error(ERR_WARN, "cannot open joystick device '%s'", device_name);

      continue;
    }

    joystick.status = JOYSTICK_ACTIVATED;
  }

  unix_joystick_subsystem_initialized = TRUE;
}

boolean UnixReadJoystick(int fd, int *x, int *y, boolean *b1, boolean *b2)
{
#if defined(PLATFORM_FREEBSD)
  struct joystick joy_ctrl;
#else
  struct joystick_control
  {
    int buttons;
    int x;
    int y;
  } joy_ctrl;
#endif

  if (read(fd, &joy_ctrl, sizeof(joy_ctrl)) != sizeof(joy_ctrl))
    return FALSE;

  if (x != NULL)
    *x = joy_ctrl.x;
  if (y != NULL)
    *y = joy_ctrl.y;

#if defined(PLATFORM_FREEBSD)
  if (b1 != NULL)
    *b1 = joy_ctrl.b1;
  if (b2 != NULL)
    *b2 = joy_ctrl.b2;
#else
  if (b1 != NULL)
    *b1 = joy_ctrl.buttons & 1;
  if (b2 != NULL)
    *b2 = joy_ctrl.buttons & 2;
#endif

  return TRUE;
}
#endif /* PLATFORM_UNIX && !TARGET_SDL */


/* ========================================================================= */
/* platform independent joystick functions                                   */
/* ========================================================================= */

#define TRANSLATE_JOYSYMBOL_TO_JOYNAME	0
#define TRANSLATE_JOYNAME_TO_JOYSYMBOL	1

void translate_joyname(int *joysymbol, char **name, int mode)
{
  static struct
  {
    int joysymbol;
    char *name;
  } translate_joy[] =
  {
    { JOY_LEFT,		"joystick_left" },
    { JOY_RIGHT,	"joystick_right" },
    { JOY_UP,		"joystick_up" },
    { JOY_DOWN,		"joystick_down" },
    { JOY_BUTTON_1,	"joystick_button_1" },
    { JOY_BUTTON_2,	"joystick_button_2" },
  };

  int i;

  if (mode == TRANSLATE_JOYSYMBOL_TO_JOYNAME)
  {
    *name = "[undefined]";

    for (i = 0; i < 6; i++)
    {
      if (*joysymbol == translate_joy[i].joysymbol)
      {
	*name = translate_joy[i].name;
	break;
      }
    }
  }
  else if (mode == TRANSLATE_JOYNAME_TO_JOYSYMBOL)
  {
    *joysymbol = 0;

    for (i = 0; i < 6; i++)
    {
      if (strEqual(*name, translate_joy[i].name))
      {
	*joysymbol = translate_joy[i].joysymbol;
	break;
      }
    }
  }
}

char *getJoyNameFromJoySymbol(int joysymbol)
{
  char *name;

  translate_joyname(&joysymbol, &name, TRANSLATE_JOYSYMBOL_TO_JOYNAME);
  return name;
}

int getJoySymbolFromJoyName(char *name)
{
  int joysymbol;

  translate_joyname(&joysymbol, &name, TRANSLATE_JOYNAME_TO_JOYSYMBOL);
  return joysymbol;
}

int getJoystickNrFromDeviceName(char *device_name)
{
  char c;
  int joystick_nr = 0;

  if (device_name == NULL || device_name[0] == '\0')
    return 0;

  c = device_name[strlen(device_name) - 1];

  if (c >= '0' && c <= '9')
    joystick_nr = (int)(c - '0');

  if (joystick_nr < 0 || joystick_nr >= MAX_PLAYERS)
    joystick_nr = 0;

  return joystick_nr;
}

char *getDeviceNameFromJoystickNr(int joystick_nr)
{
  static char *joystick_device_name[MAX_PLAYERS] =
  {
    DEV_JOYSTICK_0,
    DEV_JOYSTICK_1,
    DEV_JOYSTICK_2,
    DEV_JOYSTICK_3
  };

  return (joystick_nr >= 0 && joystick_nr <= 3 ?
	  joystick_device_name[joystick_nr] : "");
}

static int JoystickPositionPercent(int center, int border, int actual)
{
  long range, position;
  int percent;

  if (border < center && actual > center)
    return 0;
  if (border > center && actual < center)
    return 0;

  range = ABS(border - center);
  position = ABS(actual - center);

  percent = (int)(position * 100 / range);

  if (percent > 100)
    percent = 100;

  return percent;
}

void CheckJoystickData()
{
  int i;
  int distance = 100;

  for (i = 0; i < MAX_PLAYERS; i++)
  {
    if (setup.input[i].joy.xleft >= setup.input[i].joy.xmiddle)
      setup.input[i].joy.xleft = setup.input[i].joy.xmiddle - distance;
    if (setup.input[i].joy.xright <= setup.input[i].joy.xmiddle)
      setup.input[i].joy.xright = setup.input[i].joy.xmiddle + distance;

    if (setup.input[i].joy.yupper >= setup.input[i].joy.ymiddle)
      setup.input[i].joy.yupper = setup.input[i].joy.ymiddle - distance;
    if (setup.input[i].joy.ylower <= setup.input[i].joy.ymiddle)
      setup.input[i].joy.ylower = setup.input[i].joy.ymiddle + distance;
  }
}

int Joystick(int player_nr)
{
  int joystick_fd = joystick.fd[player_nr];
  int js_x, js_y;
  boolean js_b1, js_b2;
  int left, right, up, down;
  int result = JOY_NO_ACTION;

  if (joystick.status != JOYSTICK_ACTIVATED)
    return JOY_NO_ACTION;

  if (joystick_fd < 0 || !setup.input[player_nr].use_joystick)
    return JOY_NO_ACTION;

  if (!ReadJoystick(joystick_fd, &js_x, &js_y, &js_b1, &js_b2))
  {
    Error(ERR_WARN, "cannot read joystick device '%s'",
	  setup.input[player_nr].joy.device_name);

    joystick.status = JOYSTICK_NOT_AVAILABLE;
    return JOY_NO_ACTION;
  }

  left  = JoystickPositionPercent(setup.input[player_nr].joy.xmiddle,
				  setup.input[player_nr].joy.xleft,  js_x);
  right = JoystickPositionPercent(setup.input[player_nr].joy.xmiddle,
				  setup.input[player_nr].joy.xright, js_x);
  up    = JoystickPositionPercent(setup.input[player_nr].joy.ymiddle,
				  setup.input[player_nr].joy.yupper, js_y);
  down  = JoystickPositionPercent(setup.input[player_nr].joy.ymiddle,
				  setup.input[player_nr].joy.ylower, js_y);

  if (left > JOYSTICK_PERCENT)
    result |= JOY_LEFT;
  else if (right > JOYSTICK_PERCENT)
    result |= JOY_RIGHT;
  if (up > JOYSTICK_PERCENT)
    result |= JOY_UP;
  else if (down > JOYSTICK_PERCENT)
    result |= JOY_DOWN;

  if (js_b1)
    result |= JOY_BUTTON_1;
  if (js_b2)
    result |= JOY_BUTTON_2;

  return result;
}

int JoystickButton(int player_nr)
{
  static int last_joy_button[MAX_PLAYERS] = { 0, 0, 0, 0 };
  int joy_button = (Joystick(player_nr) & JOY_BUTTON);
  int result;

  if (joy_button)
  {
    if (last_joy_button[player_nr])
      result = JOY_BUTTON_PRESSED;
    else
      result = JOY_BUTTON_NEW_PRESSED;
  }
  else
  {
    if (last_joy_button[player_nr])
      result = JOY_BUTTON_NEW_RELEASED;
    else
      result = JOY_BUTTON_NOT_PRESSED;
  }

  last_joy_button[player_nr] = joy_button;
  return result;
}

int AnyJoystick()
{
  int i;
  int result = 0;

  for (i = 0; i < MAX_PLAYERS; i++)
    result |= Joystick(i);

  return result;
}

int AnyJoystickButton()
{
  int i;
  int result = JOY_BUTTON_NOT_PRESSED;

  for (i = 0; i < MAX_PLAYERS; i++)
  {
    result = JoystickButton(i);
    if (result != JOY_BUTTON_NOT_PRESSED)
      break;
  }

  return result;
}

void DeactivateJoystick()
{
  /* Temporarily deactivate joystick. This is needed for calibration
     screens, where the player has to select a joystick device that
     should be calibrated. If there is a totally uncalibrated joystick
     active, it may be impossible (due to messed up input from joystick)
     to select the joystick device to calibrate even when trying to use
     the mouse or keyboard to select the device. */

  if (joystick.status & JOYSTICK_AVAILABLE)
    joystick.status &= ~JOYSTICK_ACTIVE;
}

void ActivateJoystick()
{
  /* reactivate temporarily deactivated joystick */

  if (joystick.status & JOYSTICK_AVAILABLE)
    joystick.status |= JOYSTICK_ACTIVE;
}