# -*- coding: utf-8 -*-
from __future__ import absolute_import, unicode_literals
import six


def to_text(value, encoding='utf-8'):
    """Convert value to unicode, default encoding is utf-8
    :param value: Value to be converted
    :param encoding: Desired encoding
    """
    if not value:
        return ''
    if isinstance(value, six.text_type):
        return value
    if isinstance(value, six.binary_type):
        return value.decode(encoding)
    return six.text_type(value)


def to_binary(value, encoding='utf-8'):
    """Convert value to binary string, default encoding is utf-8
    :param value: Value to be converted
    :param encoding: Desired encoding
    """
    if not value:
        return b''
    if isinstance(value, six.binary_type):
        return value
    if isinstance(value, six.text_type):
        return value.encode(encoding)
    return six.binary_type(value)
