import os
import warnings

from django.conf import settings

CAPTCHA_FONT_PATH = getattr(settings, 'CAPTCHA_FONT_PATH', os.path.normpath(os.path.join(os.path.dirname(__file__), '..', 'fonts/Vera.ttf')))
CAPTCHA_FONT_SIZE = getattr(settings, 'CAPTCHA_FONT_SIZE', 22)
CAPTCHA_LETTER_ROTATION = getattr(settings, 'CAPTCHA_LETTER_ROTATION', (-35, 35))
CAPTCHA_BACKGROUND_COLOR = getattr(settings, 'CAPTCHA_BACKGROUND_COLOR', '#ffffff')
CAPTCHA_FOREGROUND_COLOR = getattr(settings, 'CAPTCHA_FOREGROUND_COLOR', '#001100')
CAPTCHA_CHALLENGE_FUNCT = getattr(settings, 'CAPTCHA_CHALLENGE_FUNCT', 'captcha.helpers.random_char_challenge')
CAPTCHA_NOISE_FUNCTIONS = getattr(settings, 'CAPTCHA_NOISE_FUNCTIONS', ('captcha.helpers.noise_arcs', 'captcha.helpers.noise_dots',))
CAPTCHA_FILTER_FUNCTIONS = getattr(settings, 'CAPTCHA_FILTER_FUNCTIONS', ('captcha.helpers.post_smooth',))
CAPTCHA_WORDS_DICTIONARY = getattr(settings, 'CAPTCHA_WORDS_DICTIONARY', '/usr/share/dict/words')
CAPTCHA_PUNCTUATION = getattr(settings, 'CAPTCHA_PUNCTUATION', '''_"',.;:-''')
CAPTCHA_FLITE_PATH = getattr(settings, 'CAPTCHA_FLITE_PATH', None)
CAPTCHA_SOX_PATH = getattr(settings, 'CAPTCHA_SOX_PATH', None)
CAPTCHA_TIMEOUT = getattr(settings, 'CAPTCHA_TIMEOUT', 5)  # Minutes
CAPTCHA_LENGTH = int(getattr(settings, 'CAPTCHA_LENGTH', 4))  # Chars
# CAPTCHA_IMAGE_BEFORE_FIELD = getattr(settings, 'CAPTCHA_IMAGE_BEFORE_FIELD', True)
CAPTCHA_DICTIONARY_MIN_LENGTH = getattr(settings, 'CAPTCHA_DICTIONARY_MIN_LENGTH', 0)
CAPTCHA_DICTIONARY_MAX_LENGTH = getattr(settings, 'CAPTCHA_DICTIONARY_MAX_LENGTH', 99)
CAPTCHA_IMAGE_SIZE = getattr(settings, 'CAPTCHA_IMAGE_SIZE', None)
CAPTCHA_IMAGE_TEMPLATE = getattr(settings, 'CAPTCHA_IMAGE_TEMPLATE', 'captcha/image.html')
CAPTCHA_HIDDEN_FIELD_TEMPLATE = getattr(settings, 'CAPTCHA_HIDDEN_FIELD_TEMPLATE', 'captcha/hidden_field.html')
CAPTCHA_TEXT_FIELD_TEMPLATE = getattr(settings, 'CAPTCHA_TEXT_FIELD_TEMPLATE', 'captcha/text_field.html')

if getattr(settings, 'CAPTCHA_FIELD_TEMPLATE', None):
    msg = ("CAPTCHA_FIELD_TEMPLATE setting is deprecated in favor of widget's template_name.")
    warnings.warn(msg, DeprecationWarning)
CAPTCHA_FIELD_TEMPLATE = getattr(settings, 'CAPTCHA_FIELD_TEMPLATE', None)
if getattr(settings, 'CAPTCHA_OUTPUT_FORMAT', None):
    msg = ("CAPTCHA_OUTPUT_FORMAT setting is deprecated in favor of widget's template_name.")
    warnings.warn(msg, DeprecationWarning)
CAPTCHA_OUTPUT_FORMAT = getattr(settings, 'CAPTCHA_OUTPUT_FORMAT', None)

CAPTCHA_MATH_CHALLENGE_OPERATOR = getattr(settings, 'CAPTCHA_MATH_CHALLENGE_OPERATOR', '*')
CAPTCHA_GET_FROM_POOL = getattr(settings, 'CAPTCHA_GET_FROM_POOL', False)
CAPTCHA_GET_FROM_POOL_TIMEOUT = getattr(settings, 'CAPTCHA_GET_FROM_POOL_TIMEOUT', 5)

CAPTCHA_TEST_MODE = getattr(settings, 'CAPTCHA_TEST_MODE', False)

# Failsafe
if CAPTCHA_DICTIONARY_MIN_LENGTH > CAPTCHA_DICTIONARY_MAX_LENGTH:
    CAPTCHA_DICTIONARY_MIN_LENGTH, CAPTCHA_DICTIONARY_MAX_LENGTH = CAPTCHA_DICTIONARY_MAX_LENGTH, CAPTCHA_DICTIONARY_MIN_LENGTH


def _callable_from_string(string_or_callable):
    if callable(string_or_callable):
        return string_or_callable
    else:
        return getattr(__import__('.'.join(string_or_callable.split('.')[:-1]), {}, {}, ['']), string_or_callable.split('.')[-1])


def get_challenge(generator=None):
    return _callable_from_string(generator or CAPTCHA_CHALLENGE_FUNCT)


def noise_functions():
    if CAPTCHA_NOISE_FUNCTIONS:
        return map(_callable_from_string, CAPTCHA_NOISE_FUNCTIONS)
    return []


def filter_functions():
    if CAPTCHA_FILTER_FUNCTIONS:
        return map(_callable_from_string, CAPTCHA_FILTER_FUNCTIONS)
    return []

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