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# -*- coding: utf-8 -*-
"""
    babel.lists
    ~~~~~~~~~~~

    Locale dependent formatting of lists.

    The default locale for the functions in this module is determined by the
    following environment variables, in that order:

     * ``LC_ALL``, and
     * ``LANG``

    :copyright: (c) 2015-2021 by the Babel Team.
    :license: BSD, see LICENSE for more details.
"""

from babel.core import Locale, default_locale

DEFAULT_LOCALE = default_locale()


def format_list(lst, style='standard', locale=DEFAULT_LOCALE):
    """
    Format the items in `lst` as a list.

    >>> format_list(['apples', 'oranges', 'pears'], locale='en')
    u'apples, oranges, and pears'
    >>> format_list(['apples', 'oranges', 'pears'], locale='zh')
    u'apples\u3001oranges\u548cpears'
    >>> format_list(['omena', 'peruna', 'aplari'], style='or', locale='fi')
    u'omena, peruna tai aplari'

    These styles are defined, but not all are necessarily available in all locales.
    The following text is verbatim from the Unicode TR35-49 spec [1].

    * standard:
      A typical 'and' list for arbitrary placeholders.
      eg. "January, February, and March"
    * standard-short:
      A short version of a 'and' list, suitable for use with short or abbreviated placeholder values.
      eg. "Jan., Feb., and Mar."
    * or:
      A typical 'or' list for arbitrary placeholders.
      eg. "January, February, or March"
    * or-short:
      A short version of an 'or' list.
      eg. "Jan., Feb., or Mar."
    * unit:
      A list suitable for wide units.
      eg. "3 feet, 7 inches"
    * unit-short:
      A list suitable for short units
      eg. "3 ft, 7 in"
    * unit-narrow:
      A list suitable for narrow units, where space on the screen is very limited.
      eg. "3′ 7″"

    [1]: https://www.unicode.org/reports/tr35/tr35-49/tr35-general.html#ListPatterns

    :param lst: a sequence of items to format in to a list
    :param style: the style to format the list with. See above for description.
    :param locale: the locale
    """
    locale = Locale.parse(locale)
    if not lst:
        return ''
    if len(lst) == 1:
        return lst[0]

    if style not in locale.list_patterns:
        raise ValueError('Locale %s does not support list formatting style %r (supported are %s)' % (
            locale,
            style,
            list(sorted(locale.list_patterns)),
        ))
    patterns = locale.list_patterns[style]

    if len(lst) == 2:
        return patterns['2'].format(*lst)

    result = patterns['start'].format(lst[0], lst[1])
    for elem in lst[2:-1]:
        result = patterns['middle'].format(result, elem)
    result = patterns['end'].format(result, lst[-1])

    return result