from django.template.defaultfilters import dictsortreversed
from django.test import SimpleTestCase


class FunctionTests(SimpleTestCase):
    def test_sort(self):
        sorted_dicts = dictsortreversed(
            [
                {"age": 23, "name": "Barbara-Ann"},
                {"age": 63, "name": "Ra Ra Rasputin"},
                {"name": "Jonny B Goode", "age": 18},
            ],
            "age",
        )

        self.assertEqual(
            [sorted(dict.items()) for dict in sorted_dicts],
            [
                [("age", 63), ("name", "Ra Ra Rasputin")],
                [("age", 23), ("name", "Barbara-Ann")],
                [("age", 18), ("name", "Jonny B Goode")],
            ],
        )

    def test_sort_list_of_tuples(self):
        data = [("a", "42"), ("c", "string"), ("b", "foo")]
        expected = [("c", "string"), ("b", "foo"), ("a", "42")]
        self.assertEqual(dictsortreversed(data, 0), expected)

    def test_sort_list_of_tuple_like_dicts(self):
        data = [
            {"0": "a", "1": "42"},
            {"0": "c", "1": "string"},
            {"0": "b", "1": "foo"},
        ]
        expected = [
            {"0": "c", "1": "string"},
            {"0": "b", "1": "foo"},
            {"0": "a", "1": "42"},
        ]
        self.assertEqual(dictsortreversed(data, "0"), expected)

    def test_invalid_values(self):
        """
        If dictsortreversed is passed something other than a list of
        dictionaries, fail silently.
        """
        self.assertEqual(dictsortreversed([1, 2, 3], "age"), "")
        self.assertEqual(dictsortreversed("Hello!", "age"), "")
        self.assertEqual(dictsortreversed({"a": 1}, "age"), "")
        self.assertEqual(dictsortreversed(1, "age"), "")

    def test_invalid_args(self):
        """Fail silently if invalid lookups are passed."""
        self.assertEqual(dictsortreversed([{}], "._private"), "")
        self.assertEqual(dictsortreversed([{"_private": "test"}], "_private"), "")
        self.assertEqual(
            dictsortreversed([{"nested": {"_private": "test"}}], "nested._private"), ""
        )