import decimal

import datetime

from django.conf import settings

from django.utils.translation import get_language, to_locale, check_for_language

from django.utils.importlib import import_module

from django.utils.encoding import smart_str

from django.utils import dateformat, numberformat, datetime_safe

def get_format_modules(reverse=False):

    """

    Returns an iterator over the format modules found in the project and Django

    """

    modules = []

    if not check_for_language(get_language()) or not settings.USE_L10N:

        return modules

    locale = to_locale(get_language())

    if settings.FORMAT_MODULE_PATH:

        format_locations = [settings.FORMAT_MODULE_PATH + '.%s']

    else:

        format_locations = []

    format_locations.append('django.conf.locale.%s')

    for location in format_locations:

        for l in (locale, locale.split('_')[0]):

            try:

                mod = import_module('.formats', location % l)

            except ImportError:

                pass

            else:

                # Don't return duplicates

                if mod not in modules:

                    modules.append(mod)

    if reverse:

        modules.reverse()

    return modules

def get_format(format_type):

    """

    For a specific format type, returns the format for the current

    language (locale), defaults to the format in the settings.

    format_type is the name of the format, e.g. 'DATE_FORMAT'

    """

    format_type = smart_str(format_type)

    if settings.USE_L10N:

        for module in get_format_modules():

            try:

                return getattr(module, format_type)

            except AttributeError:

                pass

    return getattr(settings, format_type)

def date_format(value, format=None):

    """

    Formats a datetime.date or datetime.datetime object using a

    localizable format

    """

    return dateformat.format(value, get_format(format or 'DATE_FORMAT'))

def time_format(value, format=None):

    """

    Formats a datetime.time object using a localizable format

    """

    return dateformat.time_format(value, get_format(format or 'TIME_FORMAT'))

def number_format(value, decimal_pos=None):

    """

    Formats a numeric value using localization settings

    """

    return numberformat.format(

        value,

        get_format('DECIMAL_SEPARATOR'),

        decimal_pos,

        get_format('NUMBER_GROUPING'),

        get_format('THOUSAND_SEPARATOR'),

    )

def localize(value):

    """

    Checks if value is a localizable type (date, number...) and returns it

    formatted as a string using current locale format

    """

    if settings.USE_L10N:

        if isinstance(value, (decimal.Decimal, float, int)):

            return number_format(value)

        elif isinstance(value, datetime.datetime):

            return date_format(value, 'DATETIME_FORMAT')

        elif isinstance(value, datetime.date):

            return date_format(value)

        elif isinstance(value, datetime.time):

            return time_format(value, 'TIME_FORMAT')

    return value

def localize_input(value, default=None):

    """

    Checks if an input value is a localizable type and returns it

    formatted with the appropriate formatting string of the current locale.

    """

    if isinstance(value, (decimal.Decimal, float, int)):

        return number_format(value)

    if isinstance(value, datetime.datetime):

        value = datetime_safe.new_datetime(value)

        format = smart_str(default or get_format('DATETIME_INPUT_FORMATS')[0])

        return value.strftime(format)

    elif isinstance(value, datetime.date):

        value = datetime_safe.new_date(value)

        format = smart_str(default or get_format('DATE_INPUT_FORMATS')[0])

        return value.strftime(format)

    elif isinstance(value, datetime.time):

        format = smart_str(default or get_format('TIME_INPUT_FORMATS')[0])

        return value.strftime(format)

    return value

def sanitize_separators(value):

    """

    Sanitizes a value according to the current decimal and

    thousand separator setting. Used with form field input.

    """

    if settings.USE_L10N:

        decimal_separator = get_format('DECIMAL_SEPARATOR')

        if isinstance(value, basestring):

            parts = []

            if decimal_separator in value:

                value, decimals = value.split(decimal_separator, 1)

                parts.append(decimals)

            if settings.USE_THOUSAND_SEPARATOR:

                parts.append(value.replace(get_format('THOUSAND_SEPARATOR'), ''))

            else:

                parts.append(value)

            value = '.'.join(reversed(parts))

    return value