import copy
from rest_framework import serializers
from py.test import raises

import graphene

from ..serializer_converter import convert_serializer_field
from ..types import DictType


def _get_type(rest_framework_field, **kwargs):
    # prevents the following error:
    # AssertionError: The `source` argument is not meaningful when applied to a `child=` field.
    # Remove `source=` from the field declaration.
    # since we are reusing the same child in when testing the required attribute

    if 'child' in kwargs:
        kwargs['child'] = copy.deepcopy(kwargs['child'])

    field = rest_framework_field(**kwargs)

    return convert_serializer_field(field)


def assert_conversion(rest_framework_field, graphene_field, **kwargs):
    graphene_type = _get_type(rest_framework_field, help_text='Custom Help Text', **kwargs)
    assert isinstance(graphene_type, graphene_field)

    graphene_type_required = _get_type(
        rest_framework_field, help_text='Custom Help Text', required=True, **kwargs
    )
    assert isinstance(graphene_type_required, graphene_field)

    return graphene_type


def test_should_unknown_rest_framework_field_raise_exception():
    with raises(Exception) as excinfo:
        convert_serializer_field(None)
    assert 'Don\'t know how to convert the serializer field' in str(excinfo.value)


def test_should_date_convert_string():
    assert_conversion(serializers.DateField, graphene.String)


def test_should_time_convert_string():
    assert_conversion(serializers.TimeField, graphene.String)


def test_should_date_time_convert_string():
    assert_conversion(serializers.DateTimeField, graphene.String)


def test_should_char_convert_string():
    assert_conversion(serializers.CharField, graphene.String)


def test_should_email_convert_string():
    assert_conversion(serializers.EmailField, graphene.String)


def test_should_slug_convert_string():
    assert_conversion(serializers.SlugField, graphene.String)


def test_should_url_convert_string():
    assert_conversion(serializers.URLField, graphene.String)


def test_should_choice_convert_string():
    assert_conversion(serializers.ChoiceField, graphene.String, choices=[])


def test_should_base_field_convert_string():
    assert_conversion(serializers.Field, graphene.String)


def test_should_regex_convert_string():
    assert_conversion(serializers.RegexField, graphene.String, regex='[0-9]+')


def test_should_uuid_convert_string():
    if hasattr(serializers, 'UUIDField'):
        assert_conversion(serializers.UUIDField, graphene.String)


def test_should_integer_convert_int():
    assert_conversion(serializers.IntegerField, graphene.Int)


def test_should_boolean_convert_boolean():
    assert_conversion(serializers.BooleanField, graphene.Boolean)


def test_should_float_convert_float():
    assert_conversion(serializers.FloatField, graphene.Float)


def test_should_decimal_convert_float():
    assert_conversion(serializers.DecimalField, graphene.Float, max_digits=4, decimal_places=2)


def test_should_list_convert_to_list():
    class StringListField(serializers.ListField):
        child = serializers.CharField()

    field_a = assert_conversion(
        serializers.ListField,
        graphene.List,
        child=serializers.IntegerField(min_value=0, max_value=100)
    )

    assert field_a.of_type == graphene.Int

    field_b = assert_conversion(StringListField, graphene.List)

    assert field_b.of_type == graphene.String


def test_should_dict_convert_dict():
    assert_conversion(serializers.DictField, DictType)


def test_should_duration_convert_string():
    assert_conversion(serializers.DurationField, graphene.String)


def test_should_file_convert_string():
    assert_conversion(serializers.FileField, graphene.String)


def test_should_filepath_convert_string():
    assert_conversion(serializers.FilePathField, graphene.String, path='/')


def test_should_ip_convert_string():
    assert_conversion(serializers.IPAddressField, graphene.String)


def test_should_image_convert_string():
    assert_conversion(serializers.ImageField, graphene.String)


def test_should_json_convert_jsonstring():
    assert_conversion(serializers.JSONField, graphene.types.json.JSONString)


def test_should_multiplechoicefield_convert_to_list_of_string():
    field = assert_conversion(serializers.MultipleChoiceField, graphene.List, choices=[1,2,3])

    assert field.of_type == graphene.String