"""
Checks that only valid values are used in a mapping context.
"""
# pylint: disable=missing-docstring,invalid-name,too-few-public-methods,no-self-use,import-error
from __future__ import print_function


def test(**kwargs):
    print(kwargs)


# dictionary value/comprehension
dict_value = dict(a=1, b=2, c=3)
dict_comp = {chr(x): x for x in range(256)}
test(**dict_value)
test(**dict_comp)


# in order to be used in kwargs custom mapping class should define
# __iter__(), __getitem__(key) and keys().
class CustomMapping(object):
    def __init__(self):
        self.data = dict(a=1, b=2, c=3, d=4, e=5)

    def __getitem__(self, key):
        return self.data[key]

    def keys(self):
        return self.data.keys()

test(**CustomMapping())
test(**CustomMapping)  # [not-a-mapping]

class NotMapping(object):
    pass

test(**NotMapping())  # [not-a-mapping]

# skip checks if statement is inside mixin/base/abstract class
class SomeMixin(object):
    kwargs = None

    def get_kwargs(self):
        return self.kwargs

    def run(self, **kwargs):
        print(kwargs)

    def dispatch(self):
        kws = self.get_kwargs()
        self.run(**kws)

class AbstractThing(object):
    kwargs = None

    def get_kwargs(self):
        return self.kwargs

    def run(self, **kwargs):
        print(kwargs)

    def dispatch(self):
        kws = self.get_kwargs()
        self.run(**kws)

class BaseThing(object):
    kwargs = None

    def get_kwargs(self):
        return self.kwargs

    def run(self, **kwargs):
        print(kwargs)

    def dispatch(self):
        kws = self.get_kwargs()
        self.run(**kws)

# abstract class
class Thing(object):
    def get_kwargs(self):
        raise NotImplementedError

    def run(self, **kwargs):
        print(kwargs)

    def dispatch(self):
        kwargs = self.get_kwargs()
        self.run(**kwargs)

# skip uninferable instances
from some_missing_module import Mapping

class MyClass(Mapping):
    pass

test(**MyClass())