import copy

from django.db import models
from pytest import raises
from rest_framework import serializers

import graphene

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


def _get_type(
    rest_framework_field, is_input=True, convert_choices_to_enum=True, **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, is_input=is_input, convert_choices_to_enum=convert_choices_to_enum
    )


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_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_enum():
    field = assert_conversion(
        serializers.ChoiceField,
        graphene.Enum,
        choices=[("h", "Hello"), ("w", "World")],
        source="word",
    )
    assert field._meta.enum.__members__["H"].value == "h"
    assert field._meta.enum.__members__["H"].description == "Hello"
    assert field._meta.enum.__members__["W"].value == "w"
    assert field._meta.enum.__members__["W"].description == "World"


def test_should_choice_convert_string_if_enum_disabled():
    assert_conversion(
        serializers.ChoiceField,
        graphene.String,
        choices=[("h", "Hello"), ("w", "World")],
        source="word",
        convert_choices_to_enum=False,
    )


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_model_convert_field():
    class MyModelSerializer(serializers.ModelSerializer):
        class Meta:
            model = None
            fields = "__all__"

    assert_conversion(MyModelSerializer, graphene.Field, is_input=False)


def test_should_date_time_convert_datetime():
    assert_conversion(serializers.DateTimeField, graphene.types.datetime.DateTime)


def test_should_date_convert_date():
    assert_conversion(serializers.DateField, graphene.types.datetime.Date)


def test_should_time_convert_time():
    assert_conversion(serializers.TimeField, graphene.types.datetime.Time)


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_decimal():
    assert_conversion(
        serializers.DecimalField, graphene.Decimal, 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_list_serializer_convert_to_list():
    class FooModel(models.Model):
        pass

    class ChildSerializer(serializers.ModelSerializer):
        class Meta:
            model = FooModel
            fields = "__all__"

    class ParentSerializer(serializers.ModelSerializer):
        child = ChildSerializer(many=True)

        class Meta:
            model = FooModel
            fields = "__all__"

    converted_type = convert_serializer_field(
        ParentSerializer().get_fields()["child"], is_input=True
    )
    assert isinstance(converted_type, graphene.List)

    converted_type = convert_serializer_field(
        ParentSerializer().get_fields()["child"], is_input=False
    )
    assert isinstance(converted_type, graphene.List)
    assert converted_type.of_type is None


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

    assert issubclass(field.of_type, graphene.Enum)