import datetime

from django.core.files.uploadedfile import SimpleUploadedFile
from django.db import models
from django.forms import CharField, FileField, Form, ModelForm
from django.forms.models import ModelFormMetaclass
from django.test import SimpleTestCase, TestCase

from ..models import (
    BoundaryModel,
    ChoiceFieldModel,
    ChoiceModel,
    ChoiceOptionModel,
    Defaults,
    FileModel,
    OptionalMultiChoiceModel,
)
from . import jinja2_tests


class ChoiceFieldForm(ModelForm):
    class Meta:
        model = ChoiceFieldModel
        fields = "__all__"


class OptionalMultiChoiceModelForm(ModelForm):
    class Meta:
        model = OptionalMultiChoiceModel
        fields = "__all__"


class ChoiceFieldExclusionForm(ModelForm):
    multi_choice = CharField(max_length=50)

    class Meta:
        exclude = ["multi_choice"]
        model = ChoiceFieldModel


class EmptyCharLabelChoiceForm(ModelForm):
    class Meta:
        model = ChoiceModel
        fields = ["name", "choice"]


class EmptyIntegerLabelChoiceForm(ModelForm):
    class Meta:
        model = ChoiceModel
        fields = ["name", "choice_integer"]


class EmptyCharLabelNoneChoiceForm(ModelForm):
    class Meta:
        model = ChoiceModel
        fields = ["name", "choice_string_w_none"]


class FileForm(Form):
    file1 = FileField()


class TestTicket14567(TestCase):
    """
    The return values of ModelMultipleChoiceFields are QuerySets
    """

    def test_empty_queryset_return(self):
        """
        If a model's ManyToManyField has blank=True and is saved with no data,
        a queryset is returned.
        """
        option = ChoiceOptionModel.objects.create(name="default")
        form = OptionalMultiChoiceModelForm(
            {"multi_choice_optional": "", "multi_choice": [option.pk]}
        )
        self.assertTrue(form.is_valid())
        # The empty value is a QuerySet
        self.assertIsInstance(
            form.cleaned_data["multi_choice_optional"], models.query.QuerySet
        )
        # While we're at it, test whether a QuerySet is returned if there *is* a value.
        self.assertIsInstance(form.cleaned_data["multi_choice"], models.query.QuerySet)


class ModelFormCallableModelDefault(TestCase):
    def test_no_empty_option(self):
        """
        If a model's ForeignKey has blank=False and a default, no empty option
        is created.
        """
        option = ChoiceOptionModel.objects.create(name="default")

        choices = list(ChoiceFieldForm().fields["choice"].choices)
        self.assertEqual(len(choices), 1)
        self.assertEqual(choices[0], (option.pk, str(option)))

    def test_callable_initial_value(self):
        """
        The initial value for a callable default returning a queryset is the
        pk.
        """
        ChoiceOptionModel.objects.create(id=1, name="default")
        ChoiceOptionModel.objects.create(id=2, name="option 2")
        ChoiceOptionModel.objects.create(id=3, name="option 3")
        self.assertHTMLEqual(
            ChoiceFieldForm().as_p(),
            """
            <p><label for="id_choice">Choice:</label>
            <select name="choice" id="id_choice">
            <option value="1" selected>ChoiceOption 1</option>
            <option value="2">ChoiceOption 2</option>
            <option value="3">ChoiceOption 3</option>
            </select>
            <input type="hidden" name="initial-choice" value="1" id="initial-id_choice">
            </p>
            <p><label for="id_choice_int">Choice int:</label>
            <select name="choice_int" id="id_choice_int">
            <option value="1" selected>ChoiceOption 1</option>
            <option value="2">ChoiceOption 2</option>
            <option value="3">ChoiceOption 3</option>
            </select>
            <input type="hidden" name="initial-choice_int" value="1"
                id="initial-id_choice_int">
            </p>
            <p><label for="id_multi_choice">Multi choice:</label>
            <select multiple name="multi_choice" id="id_multi_choice" required>
            <option value="1" selected>ChoiceOption 1</option>
            <option value="2">ChoiceOption 2</option>
            <option value="3">ChoiceOption 3</option>
            </select>
            <input type="hidden" name="initial-multi_choice" value="1"
                id="initial-id_multi_choice_0">
            </p>
            <p><label for="id_multi_choice_int">Multi choice int:</label>
            <select multiple name="multi_choice_int" id="id_multi_choice_int" required>
            <option value="1" selected>ChoiceOption 1</option>
            <option value="2">ChoiceOption 2</option>
            <option value="3">ChoiceOption 3</option>
            </select>
            <input type="hidden" name="initial-multi_choice_int" value="1"
                id="initial-id_multi_choice_int_0">
            </p>
            """,
        )

    def test_initial_instance_value(self):
        "Initial instances for model fields may also be instances (refs #7287)"
        ChoiceOptionModel.objects.create(id=1, name="default")
        obj2 = ChoiceOptionModel.objects.create(id=2, name="option 2")
        obj3 = ChoiceOptionModel.objects.create(id=3, name="option 3")
        self.assertHTMLEqual(
            ChoiceFieldForm(
                initial={
                    "choice": obj2,
                    "choice_int": obj2,
                    "multi_choice": [obj2, obj3],
                    "multi_choice_int": ChoiceOptionModel.objects.exclude(
                        name="default"
                    ),
                }
            ).as_p(),
            """
            <p><label for="id_choice">Choice:</label>
            <select name="choice" id="id_choice">
            <option value="1">ChoiceOption 1</option>
            <option value="2" selected>ChoiceOption 2</option>
            <option value="3">ChoiceOption 3</option>
            </select>
            <input type="hidden" name="initial-choice" value="2" id="initial-id_choice">
            </p>
            <p><label for="id_choice_int">Choice int:</label>
            <select name="choice_int" id="id_choice_int">
            <option value="1">ChoiceOption 1</option>
            <option value="2" selected>ChoiceOption 2</option>
            <option value="3">ChoiceOption 3</option>
            </select>
            <input type="hidden" name="initial-choice_int" value="2"
                id="initial-id_choice_int">
            </p>
            <p><label for="id_multi_choice">Multi choice:</label>
            <select multiple name="multi_choice" id="id_multi_choice" required>
            <option value="1">ChoiceOption 1</option>
            <option value="2" selected>ChoiceOption 2</option>
            <option value="3" selected>ChoiceOption 3</option>
            </select>
            <input type="hidden" name="initial-multi_choice" value="2"
                id="initial-id_multi_choice_0">
            <input type="hidden" name="initial-multi_choice" value="3"
                id="initial-id_multi_choice_1">
            </p>
            <p><label for="id_multi_choice_int">Multi choice int:</label>
            <select multiple name="multi_choice_int" id="id_multi_choice_int" required>
            <option value="1">ChoiceOption 1</option>
            <option value="2" selected>ChoiceOption 2</option>
            <option value="3" selected>ChoiceOption 3</option>
            </select>
            <input type="hidden" name="initial-multi_choice_int" value="2"
                id="initial-id_multi_choice_int_0">
            <input type="hidden" name="initial-multi_choice_int" value="3"
                id="initial-id_multi_choice_int_1">
            </p>
            """,
        )


class FormsModelTestCase(TestCase):
    def test_unicode_filename(self):
        # FileModel with Unicode filename and data #########################
        file1 = SimpleUploadedFile(
            "我隻氣墊船裝滿晒鱔.txt", "मेरी मँडराने वाली नाव सर्पमीनों से भरी ह".encode()
        )
        f = FileForm(data={}, files={"file1": file1}, auto_id=False)
        self.assertTrue(f.is_valid())
        self.assertIn("file1", f.cleaned_data)
        m = FileModel.objects.create(file=f.cleaned_data["file1"])
        self.assertEqual(
            m.file.name,
            "tests/\u6211\u96bb\u6c23\u588a\u8239\u88dd\u6eff\u6652\u9c54.txt",
        )
        m.delete()

    def test_boundary_conditions(self):
        # Boundary conditions on a PositiveIntegerField #########################
        class BoundaryForm(ModelForm):
            class Meta:
                model = BoundaryModel
                fields = "__all__"

        f = BoundaryForm({"positive_integer": 100})
        self.assertTrue(f.is_valid())
        f = BoundaryForm({"positive_integer": 0})
        self.assertTrue(f.is_valid())
        f = BoundaryForm({"positive_integer": -100})
        self.assertFalse(f.is_valid())

    def test_formfield_initial(self):
        # If the model has default values for some fields, they are used as the
        # formfield initial values.
        class DefaultsForm(ModelForm):
            class Meta:
                model = Defaults
                fields = "__all__"

        self.assertEqual(DefaultsForm().fields["name"].initial, "class default value")
        self.assertEqual(
            DefaultsForm().fields["def_date"].initial, datetime.date(1980, 1, 1)
        )
        self.assertEqual(DefaultsForm().fields["value"].initial, 42)
        r1 = DefaultsForm()["callable_default"].as_widget()
        r2 = DefaultsForm()["callable_default"].as_widget()
        self.assertNotEqual(r1, r2)

        # In a ModelForm that is passed an instance, the initial values come from the
        # instance's values, not the model's defaults.
        foo_instance = Defaults(
            name="instance value", def_date=datetime.date(1969, 4, 4), value=12
        )
        instance_form = DefaultsForm(instance=foo_instance)
        self.assertEqual(instance_form.initial["name"], "instance value")
        self.assertEqual(instance_form.initial["def_date"], datetime.date(1969, 4, 4))
        self.assertEqual(instance_form.initial["value"], 12)

        from django.forms import CharField

        class ExcludingForm(ModelForm):
            name = CharField(max_length=255)

            class Meta:
                model = Defaults
                exclude = ["name", "callable_default"]

        f = ExcludingForm(
            {"name": "Hello", "value": 99, "def_date": datetime.date(1999, 3, 2)}
        )
        self.assertTrue(f.is_valid())
        self.assertEqual(f.cleaned_data["name"], "Hello")
        obj = f.save()
        self.assertEqual(obj.name, "class default value")
        self.assertEqual(obj.value, 99)
        self.assertEqual(obj.def_date, datetime.date(1999, 3, 2))


class RelatedModelFormTests(SimpleTestCase):
    def test_invalid_loading_order(self):
        """
        Test for issue 10405
        """

        class A(models.Model):
            ref = models.ForeignKey("B", models.CASCADE)

        class Meta:
            model = A
            fields = "__all__"

        msg = (
            "Cannot create form field for 'ref' yet, because "
            "its related model 'B' has not been loaded yet"
        )
        with self.assertRaisesMessage(ValueError, msg):
            ModelFormMetaclass("Form", (ModelForm,), {"Meta": Meta})

        class B(models.Model):
            pass

    def test_valid_loading_order(self):
        """
        Test for issue 10405
        """

        class C(models.Model):
            ref = models.ForeignKey("D", models.CASCADE)

        class D(models.Model):
            pass

        class Meta:
            model = C
            fields = "__all__"

        self.assertTrue(
            issubclass(
                ModelFormMetaclass("Form", (ModelForm,), {"Meta": Meta}), ModelForm
            )
        )


class ManyToManyExclusionTestCase(TestCase):
    def test_m2m_field_exclusion(self):
        # Issue 12337. save_instance should honor the passed-in exclude keyword.
        opt1 = ChoiceOptionModel.objects.create(id=1, name="default")
        opt2 = ChoiceOptionModel.objects.create(id=2, name="option 2")
        opt3 = ChoiceOptionModel.objects.create(id=3, name="option 3")
        initial = {
            "choice": opt1,
            "choice_int": opt1,
        }
        data = {
            "choice": opt2.pk,
            "choice_int": opt2.pk,
            "multi_choice": "string data!",
            "multi_choice_int": [opt1.pk],
        }
        instance = ChoiceFieldModel.objects.create(**initial)
        instance.multi_choice.set([opt2, opt3])
        instance.multi_choice_int.set([opt2, opt3])
        form = ChoiceFieldExclusionForm(data=data, instance=instance)
        self.assertTrue(form.is_valid())
        self.assertEqual(form.cleaned_data["multi_choice"], data["multi_choice"])
        form.save()
        self.assertEqual(form.instance.choice.pk, data["choice"])
        self.assertEqual(form.instance.choice_int.pk, data["choice_int"])
        self.assertEqual(list(form.instance.multi_choice.all()), [opt2, opt3])
        self.assertEqual(
            [obj.pk for obj in form.instance.multi_choice_int.all()],
            data["multi_choice_int"],
        )


class EmptyLabelTestCase(TestCase):
    def test_empty_field_char(self):
        f = EmptyCharLabelChoiceForm()
        self.assertHTMLEqual(
            f.as_p(),
            """
            <p><label for="id_name">Name:</label>
            <input id="id_name" maxlength="10" name="name" type="text" required></p>
            <p><label for="id_choice">Choice:</label>
            <select id="id_choice" name="choice">
            <option value="" selected>No Preference</option>
            <option value="f">Foo</option>
            <option value="b">Bar</option>
            </select></p>
            """,
        )

    def test_empty_field_char_none(self):
        f = EmptyCharLabelNoneChoiceForm()
        self.assertHTMLEqual(
            f.as_p(),
            """
            <p><label for="id_name">Name:</label>
            <input id="id_name" maxlength="10" name="name" type="text" required></p>
            <p><label for="id_choice_string_w_none">Choice string w none:</label>
            <select id="id_choice_string_w_none" name="choice_string_w_none">
            <option value="" selected>No Preference</option>
            <option value="f">Foo</option>
            <option value="b">Bar</option>
            </select></p>
            """,
        )

    def test_save_empty_label_forms(self):
        # Saving a form with a blank choice results in the expected
        # value being stored in the database.
        tests = [
            (EmptyCharLabelNoneChoiceForm, "choice_string_w_none", None),
            (EmptyIntegerLabelChoiceForm, "choice_integer", None),
            (EmptyCharLabelChoiceForm, "choice", ""),
        ]

        for form, key, expected in tests:
            with self.subTest(form=form):
                f = form({"name": "some-key", key: ""})
                self.assertTrue(f.is_valid())
                m = f.save()
                self.assertEqual(expected, getattr(m, key))
                self.assertEqual(
                    "No Preference", getattr(m, "get_{}_display".format(key))()
                )

    def test_empty_field_integer(self):
        f = EmptyIntegerLabelChoiceForm()
        self.assertHTMLEqual(
            f.as_p(),
            """
            <p><label for="id_name">Name:</label>
            <input id="id_name" maxlength="10" name="name" type="text" required></p>
            <p><label for="id_choice_integer">Choice integer:</label>
            <select id="id_choice_integer" name="choice_integer">
            <option value="" selected>No Preference</option>
            <option value="1">Foo</option>
            <option value="2">Bar</option>
            </select></p>
            """,
        )

    def test_get_display_value_on_none(self):
        m = ChoiceModel.objects.create(name="test", choice="", choice_integer=None)
        self.assertIsNone(m.choice_integer)
        self.assertEqual("No Preference", m.get_choice_integer_display())

    def test_html_rendering_of_prepopulated_models(self):
        none_model = ChoiceModel(name="none-test", choice_integer=None)
        f = EmptyIntegerLabelChoiceForm(instance=none_model)
        self.assertHTMLEqual(
            f.as_p(),
            """
            <p><label for="id_name">Name:</label>
            <input id="id_name" maxlength="10" name="name" type="text"
                value="none-test" required>
            </p>
            <p><label for="id_choice_integer">Choice integer:</label>
            <select id="id_choice_integer" name="choice_integer">
            <option value="" selected>No Preference</option>
            <option value="1">Foo</option>
            <option value="2">Bar</option>
            </select></p>
            """,
        )

        foo_model = ChoiceModel(name="foo-test", choice_integer=1)
        f = EmptyIntegerLabelChoiceForm(instance=foo_model)
        self.assertHTMLEqual(
            f.as_p(),
            """
            <p><label for="id_name">Name:</label>
            <input id="id_name" maxlength="10" name="name" type="text"
                value="foo-test" required>
            </p>
            <p><label for="id_choice_integer">Choice integer:</label>
            <select id="id_choice_integer" name="choice_integer">
            <option value="">No Preference</option>
            <option value="1" selected>Foo</option>
            <option value="2">Bar</option>
            </select></p>
            """,
        )


@jinja2_tests
class Jinja2EmptyLabelTestCase(EmptyLabelTestCase):
    pass