from django.core.exceptions import ValidationError

from django.forms import MultipleChoiceField

from django.test import SimpleTestCase

class MultipleChoiceFieldTest(SimpleTestCase):

    def test_multiplechoicefield_1(self):

        f = MultipleChoiceField(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"]))

        self.assertEqual(["1", "2"], f.clean(["1", "2"]))

        self.assertEqual(["1", "2"], f.clean([1, "2"]))

        self.assertEqual(["1", "2"], f.clean((1, "2")))

        with self.assertRaisesMessage(ValidationError, "'Enter a list of values.'"):

            f.clean("hello")

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

            f.clean([])

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

            f.clean(())

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

        with self.assertRaisesMessage(ValidationError, msg):

            f.clean(["3"])

    def test_multiplechoicefield_2(self):

        f = MultipleChoiceField(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"]))

        self.assertEqual(["1", "2"], f.clean(["1", "2"]))

        self.assertEqual(["1", "2"], f.clean([1, "2"]))

        self.assertEqual(["1", "2"], f.clean((1, "2")))

        with self.assertRaisesMessage(ValidationError, "'Enter a list of values.'"):

            f.clean("hello")

        self.assertEqual([], f.clean([]))

        self.assertEqual([], f.clean(()))

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

        with self.assertRaisesMessage(ValidationError, msg):

            f.clean(["3"])

    def test_multiplechoicefield_3(self):

        f = MultipleChoiceField(

            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(["1", "5"], f.clean([1, 5]))

        self.assertEqual(["1", "5"], f.clean([1, "5"]))

        self.assertEqual(["1", "5"], f.clean(["1", 5]))

        self.assertEqual(["1", "5"], f.clean(["1", "5"]))

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

        with self.assertRaisesMessage(ValidationError, msg):

            f.clean(["6"])

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

        with self.assertRaisesMessage(ValidationError, msg):

            f.clean(["1", "6"])

    def test_multiplechoicefield_changed(self):

        f = MultipleChoiceField(choices=[("1", "One"), ("2", "Two"), ("3", "Three")])

        self.assertFalse(f.has_changed(None, None))

        self.assertFalse(f.has_changed([], None))

        self.assertTrue(f.has_changed(None, ["1"]))

        self.assertFalse(f.has_changed([1, 2], ["1", "2"]))

        self.assertFalse(f.has_changed([2, 1], ["1", "2"]))

        self.assertTrue(f.has_changed([1, 2], ["1"]))

        self.assertTrue(f.has_changed([1, 2], ["1", "3"]))

    def test_disabled_has_changed(self):

        f = MultipleChoiceField(choices=[("1", "One"), ("2", "Two")], disabled=True)

        self.assertIs(f.has_changed("x", "y"), False)