from __future__ import absolute_import
from future.builtins import object
from .external.pybass import *
from functools import update_wrapper

EAX_ENVIRONMENTS = {
 'generic': EAX_ENVIRONMENT_GENERIC,
 'padded_cell': EAX_ENVIRONMENT_PADDEDCELL,
 'room': EAX_ENVIRONMENT_ROOM,
 'bathroom': EAX_ENVIRONMENT_BATHROOM,
 'living_room': EAX_ENVIRONMENT_LIVINGROOM,
 'stone_room': EAX_ENVIRONMENT_STONEROOM,
 'auditorium': EAX_ENVIRONMENT_AUDITORIUM,
 'concert_hall': EAX_ENVIRONMENT_CONCERTHALL,
 'cave': EAX_ENVIRONMENT_CAVE,
 'arena': EAX_ENVIRONMENT_ARENA,
 'hanger': EAX_ENVIRONMENT_HANGAR,
 'carpeted_hallway': EAX_ENVIRONMENT_CARPETEDHALLWAY,
 'hallway':  EAX_ENVIRONMENT_HALLWAY,
 'stone_corridor': EAX_ENVIRONMENT_STONECORRIDOR,
 'alley': EAX_ENVIRONMENT_ALLEY,
 'forest': EAX_ENVIRONMENT_FOREST,
 'city': EAX_ENVIRONMENT_CITY,
 'mountains': EAX_ENVIRONMENT_MOUNTAINS,
 'quarry': EAX_ENVIRONMENT_QUARRY,
 'plain': EAX_ENVIRONMENT_PLAIN,
 'parking_lot':  EAX_ENVIRONMENT_PARKINGLOT,
 'sewer_pipe': EAX_ENVIRONMENT_SEWERPIPE,
 'underwater':  EAX_ENVIRONMENT_UNDERWATER,
 'drugged':  EAX_ENVIRONMENT_DRUGGED,
 'dizzy': EAX_ENVIRONMENT_DIZZY,
 'psychotic':  EAX_ENVIRONMENT_PSYCHOTIC
}

class BassError (Exception):
 """Error that is raised when there is a problem with a Bass call."""

 def __init__(self, code, description):
  self.code = code
  self.description = description

 def __str__(self):
  return '%d, %s' % (self.code, self.description)

def bass_call(function, *args):
 """Makes a call to bass and raises an exception if it fails."""
 res = function(*args)
 if res == 0 or res == -1:
  code = BASS_ErrorGetCode()
  raise BassError(code, get_error_description(code))
 return res

def bass_call_0(function, *args):
 """Makes a call to bass and raises an exception if it fails.  Does not consider 0 an error."""
 res = function(*args)
 if res == -1:
  code = BASS_ErrorGetCode()
  raise BassError(code, get_error_description(code))
 return res

def update_3d_system(func):
 """Decorator to automatically update the 3d system after a function call."""
 def update_3d_system_wrapper(*args, **kwargs):
  val = func(*args, **kwargs)
  bass_call( BASS_Apply3D)
  return val
 update_wrapper(update_3d_system_wrapper, func)
 return update_3d_system_wrapper

class FlagObject(object):
 """An object which translates bass flags into human-readable/usable items"""

 def flags_for(self, **flags):
  res = 0
  for k, v in flags.items():
   if v:
    res |= self.flag_mapping[k]
  return res

 def setup_flag_mapping(self):
  self.flag_mapping = {
   'loop': BASS_SAMPLE_LOOP,
   'autofree': BASS_STREAM_AUTOFREE,
   'mono': BASS_SAMPLE_MONO,
   'software': BASS_SAMPLE_SOFTWARE,
   'three_d': BASS_SAMPLE_3D,
   'fx': BASS_SAMPLE_FX,
   'decode': BASS_STREAM_DECODE,
  }