# -*- coding: utf-8 -*-
"""
    flask_admin._compat
    ~~~~~~~~~~~~~~~~~~~~~~~

    Some py2/py3 compatibility support based on a stripped down
    version of six so we don't have to depend on a specific version
    of it.

    :copyright: (c) 2013 by Armin Ronacher.
    :license: BSD, see LICENSE for more details.
"""
import sys

PY2 = sys.version_info[0] == 2
VER = sys.version_info

if not PY2:
    text_type = str
    string_types = (str,)
    integer_types = (int, )

    iterkeys = lambda d: iter(d.keys())
    itervalues = lambda d: iter(d.values())
    iteritems = lambda d: iter(d.items())
    filter_list = lambda f, l: list(filter(f, l))

    def as_unicode(s):
        if isinstance(s, bytes):
            return s.decode('utf-8')

        return str(s)

    # Various tools
    from functools import reduce
    from urllib.parse import urljoin, urlparse
else:
    text_type = unicode
    string_types = (str, unicode)
    integer_types = (int, long)

    iterkeys = lambda d: d.iterkeys()
    itervalues = lambda d: d.itervalues()
    iteritems = lambda d: d.iteritems()
    filter_list = filter

    def as_unicode(s):
        if isinstance(s, str):
            return s.decode('utf-8')

        return unicode(s)

    # Helpers
    reduce = __builtins__['reduce'] if isinstance(__builtins__, dict) else __builtins__.reduce
    from urlparse import urljoin, urlparse


def with_metaclass(meta, *bases):
    # This requires a bit of explanation: the basic idea is to make a
    # dummy metaclass for one level of class instantiation that replaces
    # itself with the actual metaclass.  Because of internal type checks
    # we also need to make sure that we downgrade the custom metaclass
    # for one level to something closer to type (that's why __call__ and
    # __init__ comes back from type etc.).
    #
    # This has the advantage over six.with_metaclass in that it does not
    # introduce dummy classes into the final MRO.
    class metaclass(meta):
        __call__ = type.__call__
        __init__ = type.__init__

        def __new__(cls, name, this_bases, d):
            if this_bases is None:
                return type.__new__(cls, name, (), d)
            return meta(name, bases, d)
    return metaclass('temporary_class', None, {})


try:
    from collections import OrderedDict
except ImportError:
    # Bare-bones OrderedDict implementation for Python2.6 compatibility
    class OrderedDict(dict):
        def __init__(self, *args, **kwargs):
            dict.__init__(self, *args, **kwargs)
            self.ordered_keys = []
        def __setitem__(self, key, value):
            self.ordered_keys.append(key)
            dict.__setitem__(self, key, value)
        def __iter__(self):
            return (k for k in self.ordered_keys)
        def iteritems(self):
            return ((k, self[k]) for k in self.ordered_keys)
        def items(self):
            return list(self.iteritems())
