"""Unit tests for collections.defaultdict."""

import copy
import unittest

from collections import defaultdict

def foobar():
    return list

class TestDefaultDict(unittest.TestCase):

    def test_basic(self):
        d1 = defaultdict()
        self.assertEqual(d1.default_factory, None)
        d1.default_factory = list
        d = defaultdict(list, {1:2})
        d[2].append(5)
        self.assertEqual(d[2], [5])
        self.assertEqual(d.get(2), [5])
        def abc():
            return 6
        d = defaultdict(abc)
        self.assertEqual(d[4], 6)
        d[4] += 8
        self.assertEqual(d[4], 14)
        # d1[12].append(42)
        # self.assertEqual(d1, {12: [42]})
        # d1[12].append(24)
        # self.assertEqual(d1, {12: [42, 24]})
        # d1[13]
        # d1[14]
        # self.assertEqual(d1, {12: [42, 24], 13: [], 14: []})
        # self.assertTrue(d1[12] is not d1[13] is not d1[14])
        # d2 = defaultdict(list, foo=1, bar=2)
        # self.assertEqual(d2.default_factory, list)
        # self.assertEqual(d2, {"foo": 1, "bar": 2})
        # self.assertEqual(d2["foo"], 1)
        # self.assertEqual(d2["bar"], 2)
        # self.assertEqual(d2[42], [])
        # self.assertIn("foo", d2)
        # self.assertIn("foo", d2.keys())
        # self.assertIn("bar", d2)
        # self.assertIn("bar", d2.keys())
        # self.assertIn(42, d2)
        # self.assertIn(42, d2.keys())
        # self.assertNotIn(12, d2)
        # self.assertNotIn(12, d2.keys())
        # d2.default_factory = None
        # self.assertEqual(d2.default_factory, None)
        # try:
        #     d2[15]
        # except KeyError as err:
        #     self.assertEqual(err.args, (15,))
        # else:
        #     self.fail("d2[15] didn't raise KeyError")
        # self.assertRaises(TypeError, defaultdict, 1)

    def test_missing(self):
        d1 = defaultdict()
        self.assertRaises(KeyError, d1.__missing__, 42)
        d1.default_factory = list
        # self.assertEqual(d1.__missing__(42), [])

    def test_repr(self):
        d1 = defaultdict()
        self.assertEqual(d1.default_factory, None)
        self.assertEqual(repr(d1), "defaultdict(None, {})")
        # self.assertEqual(eval(repr(d1)), d1)
        d1[11] = 41
        self.assertEqual(repr(d1), "defaultdict(None, {11: 41})")
        d2 = defaultdict(int)
        self.assertEqual(d2.default_factory, int)
        d2[12] = 42
        self.assertEqual(repr(d2), "defaultdict(<class 'int'>, {12: 42})")
        def foo(): return 43
        d3 = defaultdict(foo)
        self.assertTrue(d3.default_factory is foo)
        d3[13]
        self.assertEqual(repr(d3), "defaultdict(%s, {13: 43})" % repr(foo))


    # def test_copy(self):
    #     d1 = defaultdict()
    #     d2 = d1.copy()
    #     self.assertEqual(type(d2), defaultdict)
    #     self.assertEqual(d2.default_factory, None)
    #     self.assertEqual(d2, {})
    #     d1.default_factory = list
    #     d3 = d1.copy()
    #     self.assertEqual(type(d3), defaultdict)
    #     self.assertEqual(d3.default_factory, list)
    #     self.assertEqual(d3, {})
    #     d1[42]
    #     d4 = d1.copy()
    #     self.assertEqual(type(d4), defaultdict)
    #     self.assertEqual(d4.default_factory, list)
    #     self.assertEqual(d4, {42: []})
    #     d4[12]
    #     self.assertEqual(d4, {42: [], 12: []})
    #
    #     # Issue 6637: Copy fails for empty default dict
    #     d = defaultdict()
    #     d['a'] = 42
    #     e = d.copy()
    #     self.assertEqual(e['a'], 42)

    def test_shallow_copy(self):
        d1 = defaultdict(foobar, {1: 1, 2:[2]})
        d2 = copy.copy(d1)
        d1[2][0] = 3
        self.assertEqual(d2.default_factory, foobar)
        self.assertEqual(d2, d1)
        d2[1] = 2
        self.assertNotEqual(d2,d1)
        d1.default_factory = list
        d2 = copy.copy(d1)
        self.assertEqual(d2.default_factory, list)
        self.assertEqual(d2, d1)

    # def test_deep_copy(self):
    #     d1 = defaultdict(foobar, {1: [1]})
    #     d2 = copy.deepcopy(d1)
    #     self.assertEqual(d2.default_factory, foobar)
    #     self.assertEqual(d2, d1)
    #     self.assertTrue(d1[1] is not d2[1])
    #     d1.default_factory = list
    #     d2 = copy.deepcopy(d1)
    #     self.assertEqual(d2.default_factory, list)
    #     self.assertEqual(d2, d1)

    # def test_keyerror_without_factory(self):
    #     d1 = defaultdict()
    #     try:
    #         d1[(1,)]
    #     except KeyError as err:
    #         self.assertEqual(err.args[0], (1,))
    #     else:
    #         self.fail("expected KeyError")
    #
    # def test_recursive_repr(self):
    #     # Issue2045: stack overflow when default_factory is a bound method
    #     class sub(defaultdict):
    #         def __init__(self):
    #             self.default_factory = self._factory
    #         def _factory(self):
    #             return []
    #     d = sub()
    #     self.assertRegex(repr(d),
    #         r"defaultdict\(<bound method .*sub\._factory "
    #         r"of defaultdict\(\.\.\., \{\}\)>, \{\}\)")
    #
    #     # NOTE: printing a subclass of a builtin type does not call its
    #     # tp_print slot. So this part is essentially the same test as above.
    #     tfn = tempfile.mktemp()
    #     try:
    #         f = open(tfn, "w+")
    #         try:
    #             print(d, file=f)
    #         finally:
    #             f.close()
    #     finally:
    #         os.remove(tfn)
    #
    # def test_callable_arg(self):
    #     self.assertRaises(TypeError, defaultdict, {})
    #
    # def test_pickling(self):
    #     d = defaultdict(int)
    #     d[1]
    #     for proto in range(pickle.HIGHEST_PROTOCOL + 1):
    #         s = pickle.dumps(d, proto)
    #         o = pickle.loads(s)
    #         self.assertEqual(d, o)

    def test_errors(self):
        error = None
        self.assertRaises(TypeError, defaultdict, 1)
        self.assertRaises(TypeError, defaultdict, list(), {})
        self.assertRaises(TypeError, list, 12)
        d = defaultdict(None)
        self.assertRaises(KeyError, lambda x: d[x], 5)
        self.assertEqual(d.get(5), None)
        self.assertRaises(TypeError, d.__missing__, 1, 2)
        self.assertRaises(KeyError, d.__missing__, {1:2})

if __name__ == "__main__":
    unittest.main()