from django.core.exceptions import ValidationError

from django.db import models

from django.forms import ChoiceField, Form

from django.test import SimpleTestCase

from . import FormFieldAssertionsMixin

class ChoiceFieldTest(FormFieldAssertionsMixin, SimpleTestCase):

    def test_choicefield_1(self):

        f = ChoiceField(choices=[("1", "One"), ("2", "Two")])

        with self.assertRaisesMessage(ValidationError, "'This field is required.'"):

            f.clean("")

        with self.assertRaisesMessage(ValidationError, "'This field is required.'"):

            f.clean(None)

        self.assertEqual("1", f.clean(1))

        self.assertEqual("1", f.clean("1"))

        msg = "'Select a valid choice. 3 is not one of the available choices.'"

        with self.assertRaisesMessage(ValidationError, msg):

            f.clean("3")

    def test_choicefield_2(self):

        f = ChoiceField(choices=[("1", "One"), ("2", "Two")], required=False)

        self.assertEqual("", f.clean(""))

        self.assertEqual("", f.clean(None))

        self.assertEqual("1", f.clean(1))

        self.assertEqual("1", f.clean("1"))

        msg = "'Select a valid choice. 3 is not one of the available choices.'"

        with self.assertRaisesMessage(ValidationError, msg):

            f.clean("3")

    def test_choicefield_3(self):

        f = ChoiceField(choices=[("J", "John"), ("P", "Paul")])

        self.assertEqual("J", f.clean("J"))

        msg = "'Select a valid choice. John is not one of the available choices.'"

        with self.assertRaisesMessage(ValidationError, msg):

            f.clean("John")

    def test_choicefield_4(self):

        f = ChoiceField(

            choices=[

                ("Numbers", (("1", "One"), ("2", "Two"))),

                ("Letters", (("3", "A"), ("4", "B"))),

                ("5", "Other"),

            ]

        )

        self.assertEqual("1", f.clean(1))

        self.assertEqual("1", f.clean("1"))

        self.assertEqual("3", f.clean(3))

        self.assertEqual("3", f.clean("3"))

        self.assertEqual("5", f.clean(5))

        self.assertEqual("5", f.clean("5"))

        msg = "'Select a valid choice. 6 is not one of the available choices.'"

        with self.assertRaisesMessage(ValidationError, msg):

            f.clean("6")

    def test_choicefield_choices_default(self):

        f = ChoiceField()

        self.assertEqual(f.choices, [])

    def test_choicefield_callable(self):

        def choices():

            return [("J", "John"), ("P", "Paul")]

        f = ChoiceField(choices=choices)

        self.assertEqual("J", f.clean("J"))

    def test_choicefield_callable_may_evaluate_to_different_values(self):

        choices = []

        def choices_as_callable():

            return choices

        class ChoiceFieldForm(Form):

            choicefield = ChoiceField(choices=choices_as_callable)

        choices = [("J", "John")]

        form = ChoiceFieldForm()

        self.assertEqual([("J", "John")], list(form.fields["choicefield"].choices))

        choices = [("P", "Paul")]

        form = ChoiceFieldForm()

        self.assertEqual([("P", "Paul")], list(form.fields["choicefield"].choices))

    def test_choicefield_disabled(self):

        f = ChoiceField(choices=[("J", "John"), ("P", "Paul")], disabled=True)

        self.assertWidgetRendersTo(

            f,

            '<select id="id_f" name="f" disabled><option value="J">John</option>'

            '<option value="P">Paul</option></select>',

        )

    def test_choicefield_enumeration(self):

        class FirstNames(models.TextChoices):

            JOHN = "J", "John"

            PAUL = "P", "Paul"

        f = ChoiceField(choices=FirstNames.choices)

        self.assertEqual(f.clean("J"), "J")

        msg = "'Select a valid choice. 3 is not one of the available choices.'"

        with self.assertRaisesMessage(ValidationError, msg):

            f.clean("3")