import pygame
JOY_EVENT = 7
KEY_EVENT = 2
X = 0
Y = 1
(LEFT, RIGHT, UP, DOWN) = range(4) 
KEY_LEFT = 276
KEY_UP = 273
KEY_DOWN = 274
KEY_RIGHT = 275 
DIRECTIONS = {0:'LEFT', 1:'RIGHT',  2:'UP', 3:'DOWN'}
class DdrInput(object):
  """
  DdrInput is a class to get input from the particular DDR pads and adapters we have.  It is not
  general or cross platform.  It uses pygame.  For something more general, use pad.py in the pydance
  library.  The pydance library doesn't work with our adapter, so we had to write our own code.  A
  few lines of code here are borrowed from the pydance library.


  DEBUG MODE:
    Use the arrow keys.  Hold down a modifier (alt, control, etc.) to get player 2
  """
  def __init__(self, debug_mode=True):
    """
    Debug mode prints inputs and also enables the keyboard as in input
    """
    pygame.init() #safe to call multiple times
    self.init_joysticks()
    #This is just so that we can get key presses in the demo.  remove when we plug it into a ui
    screen = pygame.display.set_mode((640, 480))
    self.debug_mode = debug_mode

  def init_joysticks(self):
    pygame.joystick.init()
    try: totaljoy = pygame.joystick.get_count()
    except: totaljoy = 0
    print totaljoy, 'joysticks loaded'
    for i in range(totaljoy):
      m = pygame.joystick.Joystick(i)
      m.init()
  
  def poll(self):
    """
    Returns a tuple of player index (0 or 1) and move, 
    LEFT, RIGHT, UP, DOWN
    """
    event = pygame.event.poll()
    player_move = None
    if event.type == JOY_EVENT:
      player_index = event.joy
      #there may be a tricky quick way to code this, but this is more readable
      #value == 0 -> released
      if event.axis == X:
        if event.value < 0:
          player_move = LEFT
        elif event.value > 0:
          player_move = RIGHT
      else:
        if event.value > 0:
          player_move = DOWN
        elif event.value < 0:
          player_move = UP
      if self.debug_mode and player_move != None:
        print (player_index, player_move)
      if player_move != None:
        return (player_index, player_move)
      else:
        return None
    if self.debug_mode:
      if event.type == KEY_EVENT:
        if event.key == KEY_LEFT:
          player_move = LEFT
        elif event.key == KEY_RIGHT:
          player_move = RIGHT
        elif event.key == KEY_DOWN:
          player_move = DOWN
        elif event.key == KEY_UP:
          player_move = UP
        player_index = event.mod == 0
        if player_move != None:
          return (player_index, player_move)
        else:
          return None