from django import forms
from django.core.exceptions import ImproperlyConfigured

import graphene

from .forms import GlobalIDFormField, GlobalIDMultipleChoiceField
from ..utils import import_single_dispatch

try:
    UUIDField = forms.UUIDField
except AttributeError:
    class UUIDField(object):
        pass


singledispatch = import_single_dispatch()


@singledispatch
def convert_form_field(field):
    raise ImproperlyConfigured(
        "Don't know how to convert the Django form field %s (%s) "
        "to Graphene type" %
        (field, field.__class__)
    )


@convert_form_field.register(forms.fields.BaseTemporalField)
@convert_form_field.register(forms.CharField)
@convert_form_field.register(forms.EmailField)
@convert_form_field.register(forms.SlugField)
@convert_form_field.register(forms.URLField)
@convert_form_field.register(forms.ChoiceField)
@convert_form_field.register(forms.RegexField)
@convert_form_field.register(forms.Field)
def convert_form_field_to_string(field):
    return graphene.String(description=field.help_text, required=field.required)


@convert_form_field.register(UUIDField)
def convert_form_field_to_uuid(field):
    return graphene.UUID(description=field.help_text, required=field.required)


@convert_form_field.register(forms.IntegerField)
@convert_form_field.register(forms.NumberInput)
def convert_form_field_to_int(field):
    return graphene.Int(description=field.help_text, required=field.required)


@convert_form_field.register(forms.BooleanField)
def convert_form_field_to_boolean(field):
    return graphene.Boolean(description=field.help_text, required=True)


@convert_form_field.register(forms.NullBooleanField)
def convert_form_field_to_nullboolean(field):
    return graphene.Boolean(description=field.help_text)


@convert_form_field.register(forms.DecimalField)
@convert_form_field.register(forms.FloatField)
def convert_form_field_to_float(field):
    return graphene.Float(description=field.help_text, required=field.required)


@convert_form_field.register(forms.ModelMultipleChoiceField)
@convert_form_field.register(GlobalIDMultipleChoiceField)
def convert_form_field_to_list(field):
    return graphene.List(graphene.ID, required=field.required)


@convert_form_field.register(forms.ModelChoiceField)
@convert_form_field.register(GlobalIDFormField)
def convert_form_field_to_id(field):
    return graphene.ID(required=field.required)


@convert_form_field.register(forms.DateField)
@convert_form_field.register(forms.DateTimeField)
def convert_form_field_to_datetime(field):
    return graphene.types.datetime.DateTime(description=field.help_text, required=field.required)


@convert_form_field.register(forms.TimeField)
def convert_form_field_to_time(field):
    return graphene.types.datetime.Time(description=field.help_text, required=field.required)