from datetime import date

from functools import partial

from collections import namedtuple
from mock import Mock, call
from re import compile
from testfixtures import (
    Comparison as C,
    Replacer,
    ShouldRaise,
    compare,
    generator,
    singleton,
    )
from testfixtures.compat import (
    class_type_name, exception_module, PY3, xrange,
    BytesLiteral, UnicodeLiteral,
    PY_37_PLUS
    )
from testfixtures.comparison import compare_sequence
from unittest import TestCase
from .compat import py_33_plus, py_2

hexaddr = compile('0x[0-9A-Fa-f]+')


def hexsub(raw):
    return hexaddr.sub('...', raw)

call_list_repr = repr(Mock().mock_calls.__class__)

marker = object()


class CompareHelper(object):

    def check_raises(self, x=marker, y=marker, message=None, regex=None,
                     compare=compare, **kw):
        args = []
        for value in x, y:
            if value is not marker:
                args.append(value)
        try:
            compare(*args, **kw)
        except Exception as e:
            if not isinstance(e, AssertionError):
                self.fail('Expected AssertionError, got %r' % e)
            actual = hexsub(e.args[0])
            if message is not None:
                # handy for debugging, but can't be relied on for tests!
                compare(actual, expected=message, show_whitespace=True)
                self.assertEqual(actual, message)
            else:
                if not regex.match(actual):  # pragma: no cover
                    self.fail('%r did not match %r' % (actual, regex.pattern))
        else:
            self.fail('No exception raised!')


class TestCompare(CompareHelper, TestCase):

    def test_object_same(self):
        o = object()
        compare(o, o)

    def test_object_diff(self):
        o1 = object()
        o2 = object()
        self.check_raises(
            o1, o2,
            '<object object at ...> != <object object at ...>'
            )

    def test_different_types(self):
        self.check_raises('x', 1, "'x' != 1")

    def test_number_same(self):
        compare(1, 1)

    def test_number_different(self):
        self.check_raises(1, 2, '1 != 2')

    def test_different_with_labels(self):
        self.check_raises(1, 2, '1 (expected) != 2 (actual)',
                          x_label='expected', y_label='actual')

    def test_string_same(self):
        compare('x', 'x')

    def test_unicode_string_different(self):
        if py_2:
            expected = "u'a' != 'b'"
        else:
            expected = "'a' != b'b'"
        self.check_raises(
            UnicodeLiteral('a'), BytesLiteral('b'),
            expected
            )

    def test_string_diff_short(self):
        self.check_raises(
            '\n'+('x'*9), '\n'+('y'*9),
            "'\\nxxxxxxxxx' != '\\nyyyyyyyyy'"
            )

    def test_string_diff_long(self):
        self.check_raises(
            'x'*11, 'y'*11,
            "\n'xxxxxxxxxxx'\n!=\n'yyyyyyyyyyy'"
            )

    def test_string_diff_long_newlines(self):
        self.check_raises(
            'x'*5+'\n'+'y'*5, 'x'*5+'\n'+'z'*5,
            "\n--- first\n+++ second\n@@ -1,2 +1,2 @@\n xxxxx\n-yyyyy\n+zzzzz"
            )

    def test_string_diff_short_labels(self):
        self.check_raises(
            '\n'+('x'*9), '\n'+('y'*9),
            "'\\nxxxxxxxxx' (expected) != '\\nyyyyyyyyy' (actual)",
            x_label='expected',
            y_label='actual'
            )

    def test_string_diff_long_labels(self):
        self.check_raises(
            'x'*11, 'y'*11,
            "\n'xxxxxxxxxxx' (expected)\n!=\n'yyyyyyyyyyy' (actual)",
            x_label='expected',
            y_label='actual'
            )

    def test_string_diff_long_newlines_labels(self):
        self.check_raises(
            'x'*5+'\n'+'y'*5, 'x'*5+'\n'+'z'*5,
            "\n--- expected\n+++ actual\n"
            "@@ -1,2 +1,2 @@\n xxxxx\n-yyyyy\n+zzzzz",
            x_label='expected',
            y_label='actual'
            )

    def test_exception_same_object(self):
        e = ValueError('some message')
        compare(e, e)

    def test_exception_same_c_wrapper(self):
        e1 = ValueError('some message')
        e2 = ValueError('some message')
        compare(C(e1), e2)

    def test_exception_different_object(self):
        e1 = ValueError('some message')
        e2 = ValueError('some message')
        if PY_37_PLUS:
            self.check_raises(
                e1, e2,
                "ValueError('some message') != ValueError('some message')"
                )
        else:
            self.check_raises(
                e1, e2,
                "ValueError('some message',) != ValueError('some message',)"
                )

    def test_exception_different_object_c_wrapper(self):
        e1 = ValueError('some message')
        e2 = ValueError('some message')
        compare(C(e1), e2)

    def test_exception_diff(self):
        e1 = ValueError('some message')
        e2 = ValueError('some other message')
        if PY_37_PLUS:
            self.check_raises(
                e1, e2,
                "ValueError('some message') != ValueError('some other message')"
                )
        else:
            self.check_raises(
                e1, e2,
                "ValueError('some message',) != ValueError('some other message',)"
                )

    def test_exception_diff_c_wrapper(self):
        e1 = ValueError('some message')
        e2 = ValueError('some other message')
        self.check_raises(
            C(e1), e2,
            ("\n"
             "  <C(failed):{}.ValueError>\n"
             "  args:('some message',) != ('some other message',)\n"
             "  </C>"
             " != "
             "ValueError('some other message'{})"
             ).format(exception_module,
                      '' if PY_37_PLUS else ','))

    def test_sequence_long(self):
        self.check_raises(
            ['quite a long string 1', 'quite a long string 2',
             'quite a long string 3', 'quite a long string 4',
             'quite a long string 5', 'quite a long string 6',
             'quite a long string 7', 'quite a long string 8'],
            ['quite a long string 1', 'quite a long string 2',
             'quite a long string 3', 'quite a long string 4',
             'quite a long string 9', 'quite a long string 10',
             'quite a long string 11', 'quite a long string 12'],
            "sequence not as expected:\n\n"
            "same:\n"
            "['quite a long string 1',\n"
            " 'quite a long string 2',\n"
            " 'quite a long string 3',\n"
            " 'quite a long string 4']\n\n"
            "first:\n"
            "['quite a long string 5',\n"
            " 'quite a long string 6',\n"
            " 'quite a long string 7',\n"
            " 'quite a long string 8']\n\n"
            "second:\n"
            "['quite a long string 9',\n"
            " 'quite a long string 10',\n"
            " 'quite a long string 11',\n"
            " 'quite a long string 12']\n"
            "\n"
            "While comparing [4]: \n"
            "'quite a long string 5'\n"
            "!=\n"
            "'quite a long string 9'"
            )

    def test_sequence_different_labels_supplied(self):
        self.check_raises(
            [1, 2, 3], [1, 2, 4],
            "sequence not as expected:\n\n"
            "same:\n"
            "[1, 2]\n\n"
            "expected:\n"
            "[3]\n\n"
            "actual:\n"
            "[4]",
            x_label='expected',
            y_label='actual',
            )

    def test_list_same(self):
        compare([1, 2, 3], [1, 2, 3])

    def test_list_different(self):
        self.check_raises(
            [1, 2, 3], [1, 2, 4],
            "sequence not as expected:\n\n"
            "same:\n"
            "[1, 2]\n\n"
            "first:\n"
            "[3]\n\n"
            "second:\n"
            "[4]"
            )

    def test_list_totally_different(self):
        self.check_raises(
            [1], [2],
            "sequence not as expected:\n\n"
            "same:\n"
            "[]\n\n"
            "first:\n"
            "[1]\n\n"
            "second:\n"
            "[2]"
            )

    def test_list_first_shorter(self):
        self.check_raises(
            [1, 2], [1, 2, 3],
            "sequence not as expected:\n\n"
            "same:\n[1, 2]\n\n"
            "first:\n[]\n\n"
            "second:\n[3]"
            )

    def test_list_second_shorter(self):
        self.check_raises(
            [1, 2, 3], [1, 2],
            "sequence not as expected:\n\n"
            "same:\n[1, 2]\n\n"
            "first:\n[3]\n\n"
            "second:\n[]"
            )

    def test_dict_same(self):
        compare(dict(x=1), dict(x=1))

    def test_dict_first_missing_keys(self):
        self.check_raises(
            dict(), dict(z=3),
            "dict not as expected:\n"
            "\n"
            "in second but not first:\n"
            "'z': 3"
            )

    def test_dict_second_missing_keys(self):
        self.check_raises(
            dict(z=3), dict(),
            "dict not as expected:\n"
            "\n"
            "in first but not second:\n"
            "'z': 3"
            )

    def test_dict_values_different(self):
        self.check_raises(
            dict(x=1), dict(x=2),
            "dict not as expected:\n"
            "\n"
            "values differ:\n"
            "'x': 1 != 2"
            )

    def test_dict_labels_specified(self):
        self.check_raises(
            dict(x=1, y=2), dict(x=2, z=3),
            "dict not as expected:\n"
            "\n"
            "in expected but not actual:\n"
            "'y': 2\n"
            "\n"
            "in actual but not expected:\n"
            "'z': 3\n"
            "\n"
            "values differ:\n"
            "'x': 1 (expected) != 2 (actual)",
            x_label='expected',
            y_label='actual'
            )

    def test_dict_tuple_keys_same_value(self):
        compare({(1, 2): None}, {(1, 2): None})

    def test_dict_tuple_keys_different_value(self):
        self.check_raises(
            {(1, 2): 3},
            {(1, 2): 42},
            "dict not as expected:\n"
            "\n"
            "values differ:\n"
            "(1, 2): 3 != 42"
            )

    def test_dict_full_diff(self):
        self.check_raises(
            dict(x=1, y=2, a=4), dict(x=1, z=3, a=5),
            "dict not as expected:\n"
            "\n"
            'same:\n'
            "['x']\n"
            "\n"
            "in first but not second:\n"
            "'y': 2\n"
            '\n'
            "in second but not first:\n"
            "'z': 3\n"
            '\n'
            "values differ:\n"
            "'a': 4 != 5"
            )

    def test_dict_consistent_ordering(self):
        self.check_raises(
            dict(xa=1, xb=2, ya=1, yb=2, aa=3, ab=4),
            dict(xa=1, xb=2, za=3, zb=4, aa=5, ab=5),
            "dict not as expected:\n"
            "\n"
            'same:\n'
            "['xa', 'xb']\n"
            "\n"
            "in first but not second:\n"
            "'ya': 1\n"
            "'yb': 2\n"
            '\n'
            "in second but not first:\n"
            "'za': 3\n"
            "'zb': 4\n"
            '\n'
            "values differ:\n"
            "'aa': 3 != 5\n"
            "'ab': 4 != 5"
            )

    def test_dict_consistent_ordering_types_same(self):
        self.check_raises(
            {None: 1, 6: 2, 1: 3},
            {None: 1, 6: 2, 1: 4},
            "dict not as expected:\n"
            "\n"
            'same:\n'
            "[6, None]\n"
            "\n"
            "values differ:\n"
            "1: 3 != 4"
            )

    def test_dict_consistent_ordering_types_x_not_y(self):
        self.check_raises(
            {None: 1, 3: 2},
            {},
            "dict not as expected:\n"
            "\n"
            "in first but not second:\n"
            "3: 2\n"
            "None: 1"
            )

    def test_dict_consistent_ordering_types_y_not_x(self):
        self.check_raises(
            {},
            {None: 1, 3: 2},
            "dict not as expected:\n"
            "\n"
            "in second but not first:\n"
            "3: 2\n"
            "None: 1"
            )

    def test_dict_consistent_ordering_types_value(self):
        self.check_raises(
            {None: 1, 6: 2},
            {None: 3, 6: 4},
            "dict not as expected:\n"
            "\n"
            "values differ:\n"
            "6: 2 != 4\n"
            "None: 1 != 3"
            )

    def test_set_same(self):
        compare(set([1]), set([1]))

    def test_set_first_missing_keys(self):
        self.check_raises(
            set(), set([3]),
            "set not as expected:\n"
            "\n"
            "in second but not first:\n"
            "[3]\n"
            '\n'
            )

    def test_set_second_missing_keys(self):
        self.check_raises(
            set([3]), set(),
            "set not as expected:\n"
            "\n"
            "in first but not second:\n"
            "[3]\n"
            '\n'
            )

    def test_set_full_diff(self):
        self.check_raises(
            set([1, 2, 4]), set([1, 3, 5]),
            "set not as expected:\n"
            "\n"
            "in first but not second:\n"
            "[2, 4]\n"
            '\n'
            "in second but not first:\n"
            "[3, 5]\n"
            '\n'
            )

    def test_set_type_ordering(self):
        self.check_raises(
            {None, 1}, {'', 2},
            "set not as expected:\n"
            "\n"
            "in first but not second:\n"
            "[1, None]\n"
            '\n'
            "in second but not first:\n"
            "['', 2]\n"
            '\n'
            )

    def test_set_labels(self):
        self.check_raises(
            set([1, 2, 4]), set([1, 3, 5]),
            "set not as expected:\n"
            "\n"
            "in expected but not actual:\n"
            "[2, 4]\n"
            '\n'
            "in actual but not expected:\n"
            "[3, 5]\n"
            '\n',
            x_label='expected',
            y_label='actual',
        )

    def test_tuple_same(self):
        compare((1, 2, 3), (1, 2, 3))

    def test_tuple_different(self):
        self.check_raises(
            (1, 2, 3), (1, 2, 4),
            "sequence not as expected:\n\n"
            "same:\n(1, 2)\n\n"
            "first:\n(3,)\n\n"
            "second:\n(4,)"
            )

    def test_tuple_totally_different(self):
        self.check_raises(
            (1, ), (2, ),
            "sequence not as expected:\n\n"
            "same:\n()\n\n"
            "first:\n(1,)\n\n"
            "second:\n(2,)"
            )

    def test_tuple_first_shorter(self):
        self.check_raises(
            (1, 2), (1, 2, 3),
            "sequence not as expected:\n\n"
            "same:\n(1, 2)\n\n"
            "first:\n()\n\n"
            "second:\n(3,)"
            )

    def test_tuple_second_shorter(self):
        self.check_raises(
            (1, 2, 3), (1, 2),
            "sequence not as expected:\n\n"
            "same:\n(1, 2)\n\n"
            "first:\n(3,)\n\n"
            "second:\n()"
            )

    def test_generator_same(self):
        compare(generator(1, 2, 3), generator(1, 2, 3))

    def test_generator_different(self):
        self.check_raises(
            generator(1, 2, 3), generator(1, 2, 4),
            "sequence not as expected:\n\n"
            "same:\n(1, 2)\n\n"
            "first:\n(3,)\n\n"
            "second:\n(4,)"
            )

    def test_generator_totally_different(self):
        self.check_raises(
            generator(1, ), generator(2, ),
            "sequence not as expected:\n\n"
            "same:\n()\n\n"
            "first:\n(1,)\n\n"
            "second:\n(2,)"
            )

    def test_generator_first_shorter(self):
        self.check_raises(
            generator(1, 2), generator(1, 2, 3),
            "sequence not as expected:\n\n"
            "same:\n(1, 2)\n\n"
            "first:\n()\n\n"
            "second:\n(3,)"
            )

    def test_generator_second_shorted(self):
        self.check_raises(
            generator(1, 2, 3), generator(1, 2),
            "sequence not as expected:\n\n"
            "same:\n(1, 2)\n\n"
            "first:\n(3,)\n\n"
            "second:\n()"
            )

    def test_nested_generator_different(self):
        self.check_raises(
            generator(1, 2, generator(3), 4),
            generator(1, 2, generator(3), 5),
            "sequence not as expected:\n"
            "\n"
            "same:\n"
            "(1, 2, <generator object generator at ...>)\n"
            "\n"
            "first:\n"
            "(4,)\n"
            "\n"
            "second:\n"
            "(5,)"
            )

    def test_nested_generator_tuple_left(self):
        compare(
            generator(1, 2, (3, ), 4),
            generator(1, 2, generator(3), 4),
            )

    def test_nested_generator_tuple_right(self):
        compare(
            generator(1, 2, generator(3), 4),
            generator(1, 2, (3, ), 4),
            )

    def test_sequence_and_generator(self):
        compare((1, 2, 3), generator(1, 2, 3))

    def test_sequence_and_generator_strict(self):
        expected = compile(
            "\(1, 2, 3\) \(<(class|type) 'tuple'>\) \(expected\) != "
            "<generator object (generator )?at... "
            "\(<(class|type) 'generator'>\) \(actual\)"
            )
        self.check_raises(
            (1, 2, 3), generator(1, 2, 3),
            regex=expected,
            strict=True,
            x_label='expected',
            y_label='actual',
            )

    def test_generator_and_sequence(self):
        compare(generator(1, 2, 3), (1, 2, 3))

    def test_iterable_with_iterable_same(self):
        compare(xrange(1, 4), xrange(1, 4))

    def test_iterable_with_iterable_different(self):
        self.check_raises(
            xrange(1, 4), xrange(1, 3),
            "sequence not as expected:\n"
            "\n"
            "same:\n"
            "(1, 2)\n"
            "\n"
            "first:\n"
            "(3,)\n"
            "\n"
            "second:\n"
            "()"
            )

    def test_iterable_and_generator(self):
        compare(xrange(1, 4), generator(1, 2, 3))

    def test_iterable_and_generator_strict(self):
        expected = compile(
            "x?range\(1, 4\) \(<(class|type) 'x?range'>\) != "
            "<generator object (generator )?at... "
            "\(<(class|type) 'generator'>\)"
            )
        self.check_raises(
            xrange(1, 4), generator(1, 2, 3),
            regex=expected,
            strict=True,
            )

    def test_generator_and_iterable(self):
        compare(generator(1, 2, 3), xrange(1, 4))

    def test_tuple_and_list(self):
        compare((1, 2, 3), [1, 2, 3])

    def test_tuple_and_list_strict(self):
        if py_2:
            expected = ("(1, 2, 3) (<type 'tuple'>) != "
                        "[1, 2, 3] (<type 'list'>)")
        else:
            expected = ("(1, 2, 3) (<class 'tuple'>) != "
                        "[1, 2, 3] (<class 'list'>)")

        self.check_raises(
            (1, 2, 3), [1, 2, 3],
            expected,
            strict=True
            )

    def test_float_subclass_strict(self):
        class TestFloat(float):
            pass
        compare(TestFloat(0.75), TestFloat(0.75), strict=True)

    def test_old_style_classes_same(self):
        class X:
            pass
        compare(X, X)

    def test_old_style_classes_different(self):
        if PY3:
            expected = (
                "<class 'testfixtures.tests.test_compare.TestCompare."
                "test_old_style_classes_different.<locals>.X'>"
                " != "
                "<class 'testfixtures.tests.test_compare.TestCompare."
                "test_old_style_classes_different.<locals>.Y'>"
                )
        else:
            expected = (
                "<class testfixtures.tests.test_compare.X at ...>"
                " != "
                "<class testfixtures.tests.test_compare.Y at ...>"
                )

        class X:
            pass

        class Y:
            pass
        self.check_raises(X, Y, expected)

    def test_show_whitespace(self):
        # does nothing! ;-)
        self.check_raises(
            ' x \n\r', ' x \n \t',
            "' x \\n\\r' != ' x \\n \\t'",
            show_whitespace=True
            )

    def test_show_whitespace_long(self):
        self.check_raises(
            "\t         \n  '", '\r     \n  ',
            '\n--- first\n'
            '+++ second\n'
            '@@ -1,2 +1,2 @@\n'
            '-\'\\t         \\n\'\n'
            '-"  \'"\n'
            '+\'\\r     \\n\'\n'
            '+\'  \'',
            show_whitespace=True
            )

    def test_show_whitespace_equal(self):
        compare('x', 'x', show_whitespace=True)

    def test_show_whitespace_not_used_because_of_other_difference(self):
        self.check_raises(
            (1, 'a'),
            (2, 'b'),
            "sequence not as expected:\n"
            "\n"
            "same:\n"
            "()\n"
            "\n"
            "first:\n"
            "(1, 'a')\n"
            "\n"
            "second:\n"
            "(2, 'b')",
            show_whitespace=False
            )

    def test_include_trailing_whitespace(self):
        self.check_raises(
            ' x \n', ' x  \n',
            "' x \\n' != ' x  \\n'"
            )

    def test_ignore_trailing_whitespace(self):
        compare(' x \t\n', ' x\t  \n', trailing_whitespace=False)

    def test_ignore_trailing_whitespace_non_string(self):
        self.check_raises(
            1, '',
            "1 != ''",
            trailing_whitespace=False
            )

    def test_ignore_trailing_whitespace_but_respect_leading_whitespace(self):
        # NB: careful: this strips off the last newline too
        #     DON'T use if you care about that!
        self.check_raises(
            'a\n b\n  c\n',
            'a\nb\nc\n',
            "'a\\n b\\n  c' != 'a\\nb\\nc'",
            trailing_whitespace=False
            )

    def test_include_blank_lines(self):
        self.check_raises(
            '\n \n', '\n  ',
            "'\\n \\n' != '\\n  '"
            )

    def test_ignore_blank_lines(self):
        compare("""
    a

\t
b
  """,
                '    a\nb', blanklines=False)

    def test_ignore_blank_lines_non_string(self):
        self.check_raises(
            1, '',
            "1 != ''",
            blanklines=False
            )

    def test_supply_comparer(self):
        def compare_dict(x, y, context):
            self.assertEqual(x, {1: 1})
            self.assertEqual(y, {2: 2})
            self.assertEqual(context.get_option('foo'), 'bar')
            return 'not equal'
        with ShouldRaise(AssertionError('not equal')):
            compare({1: 1}, {2: 2},
                    foo='bar',
                    comparers={dict: compare_dict})

    def test_register_more_specific(self):
        class_ = namedtuple('Test', 'x')
        with ShouldRaise(AssertionError('compare class_')):
            compare(class_(1), class_(2),
                    comparers={
                    tuple: Mock(return_value='compare tuple'),
                    class_: Mock(return_value='compare class_')
                    })

    def test_extra_comparers_leave_existing(self):
        class MyObject(object):
            def __init__(self, name):
                self.name = name

            def __repr__(self):
                return 'MyObject instance'

        def compare_my_object(x, y, context):
            return '%s != %s' % (x.name, y.name)
        with Replacer() as r:
            r.replace('testfixtures.comparison._registry', {
                list: compare_sequence,
                })
            self.check_raises(
                [1, MyObject('foo')], [1, MyObject('bar')],
                "sequence not as expected:\n"
                "\n"
                "same:\n"
                "[1]\n"
                "\n"
                "first:\n"
                "[MyObject instance]\n"
                "\n"
                "second:\n"
                "[MyObject instance]\n"
                "\n"
                "While comparing [1]: foo != bar",
                comparers={MyObject: compare_my_object}
                )

    def test_list_subclass(self):
        m = Mock()
        m.aCall()
        # Mock().method_calls is a list subclass
        self.check_raises(
            [call.bCall()], m.method_calls,
            "sequence not as expected:\n\n"
            "same:\n[]\n\n"
            "first:\n[call.bCall()]\n\n"
            "second:\n[call.aCall()]"
            )

    def test_strict_okay(self):
        m = object()
        compare(m, m, strict=True)

    def test_strict_comparer_supplied(self):

        compare_obj = Mock()
        compare_obj.return_value = 'not equal'

        self.check_raises(
            object(), object(),
            "not equal",
            strict=True,
            comparers={object: compare_obj},
            )

    def test_strict_default_comparer(self):
        class MyList(list):
            pass
        # default comparer used!
        self.check_raises(
            MyList((1, 2, 3)), MyList((1, 2, 4)),
            "sequence not as expected:\n"
            "\n"
            "same:\n"
            "[1, 2]\n"
            "\n"
            "first:\n"
            "[3]\n"
            "\n"
            "second:\n"
            "[4]",
            strict=True,
            )

    def test_list_subclass_strict(self):
        m = Mock()
        m.aCall()
        self.check_raises(
            [call.aCall()], m.method_calls,
            ("[call.aCall()] (<{0} 'list'>) != [call.aCall()] "
             "({1})").format(class_type_name, call_list_repr),
            strict=True,
            )

    def test_list_subclass_long_strict(self):
        m = Mock()
        m.call('X'*20)
        self.check_raises(
            [call.call('Y'*20)], m.method_calls,
            ("[call.call('YYYYYYYYYYYYYYYYYY... "
             "(<{0} 'list'>) != "
             "[call.call('XXXXXXXXXXXXXXXXXX... "
             "({1})").format(class_type_name, call_list_repr),
            strict=True,
            )

    def test_prefix(self):
        self.check_raises(1, 2, 'wrong number of orders: 1 != 2',
                          prefix='wrong number of orders')

    def test_prefix_multiline(self):
        self.check_raises(
            'x'*5+'\n'+'y'*5, 'x'*5+'\n'+'z'*5,
            "file content: \n--- first\n+++ second\n"
            "@@ -1,2 +1,2 @@\n xxxxx\n-yyyyy\n+zzzzz",
            prefix='file content'
            )

    def test_suffix(self):
        self.check_raises(
            1, 2,
            '1 != 2\n'
            'additional context',
            suffix='additional context',
            )

    def test_labels_multiline(self):
        self.check_raises(
            'x'*5+'\n'+'y'*5, 'x'*5+'\n'+'z'*5,
            "\n--- expected\n+++ actual\n"
            "@@ -1,2 +1,2 @@\n xxxxx\n-yyyyy\n+zzzzz",
            x_label='expected',
            y_label='actual'
            )

    def test_generator_with_non_generator(self):
        self.check_raises(
            generator(1, 2, 3), None,
            '<generator object generator at ...> != None',
            )

    def test_generator_with_buggy_generator(self):
        def bad_gen():
            yield 1
            # raising a TypeError here is important :-/
            raise TypeError('foo')

        with ShouldRaise(TypeError('foo')):
            compare(generator(1, 2, 3), bad_gen())

    def test_nested_dict_tuple_values_different(self):
        self.check_raises(
            dict(x=(1, 2, 3)), dict(x=(1, 2, 4)),
            "dict not as expected:\n"
            "\n"
            "values differ:\n"
            "'x': (1, 2, 3) != (1, 2, 4)\n"
            '\n'
            "While comparing ['x']: sequence not as expected:\n"
            "\n"
            "same:\n"
            "(1, 2)\n"
            "\n"
            "first:\n"
            "(3,)\n"
            "\n"
            "second:\n"
            "(4,)"
            )

    def test_nested_dict_different(self):
        self.check_raises(
            dict(x=dict(y=1)), dict(x=dict(y=2)),
            "dict not as expected:\n"
            "\n"
            "values differ:\n"
            "'x': {'y': 1} != {'y': 2}\n"
            '\n'
            "While comparing ['x']: dict not as expected:\n"
            "\n"
            "values differ:\n"
            "'y': 1 != 2"
            )

    def test_nested_dict_empty_but_same(self):
        compare(dict(x=dict()), dict(x=dict()), ignore_eq=True)

    def test_nested_dict_empty_with_keys(self):
        compare(dict(x=dict(x=1)), dict(x=dict(x=1)), ignore_eq=True)

    def test_tuple_list_different(self):
        self.check_raises(
            (1, [2, 3, 5]), (1, [2, 4, 5]),
            "sequence not as expected:\n"
            "\n"
            "same:\n"
            "(1,)\n"
            "\n"
            "first:\n"
            "([2, 3, 5],)\n"
            "\n"
            "second:\n"
            "([2, 4, 5],)\n"
            "\n"
            "While comparing [1]: sequence not as expected:\n"
            "\n"
            "same:\n"
            "[2]\n"
            "\n"
            "first:\n"
            "[3, 5]\n"
            "\n"
            "second:\n"
            "[4, 5]"
            )

    def test_tuple_long_strings_different(self):
        self.check_raises(
            (1, 2, "foo\nbar\nbaz\n", 4),
            (1, 2, "foo\nbob\nbaz\n", 4),
            "sequence not as expected:\n"
            "\n"
            "same:\n"
            "(1, 2)\n"
            "\n"
            "first:\n"
            "('foo\\nbar\\nbaz\\n', 4)\n"
            "\n"
            "second:\n"
            "('foo\\nbob\\nbaz\\n', 4)\n"
            "\n"
            "While comparing [2]: \n"
            "--- first\n"
            "+++ second\n"
            "@@ -1,4 +1,4 @@\n"
            # check that show_whitespace bubbles down
            " 'foo\\n'\n"
            "-'bar\\n'\n"
            "+'bob\\n'\n"
            " 'baz\\n'\n"
            " ''",
            show_whitespace=True
            )

    def test_dict_multiple_differences(self):
        self.check_raises(
            dict(x=(1, 2, 3), y=(4, 5, 6, )),
            dict(x=(1, 2, 4), y=(4, 5, 7, )),
            "dict not as expected:\n"
            "\n"
            "values differ:\n"
            "'x': (1, 2, 3) != (1, 2, 4)\n"
            "'y': (4, 5, 6) != (4, 5, 7)\n"
            "\n"
            "While comparing ['x']: sequence not as expected:\n"
            "\n"
            "same:\n"
            "(1, 2)\n"
            "\n"
            "first:\n"
            "(3,)\n"
            "\n"
            "second:\n"
            "(4,)\n"
            "\n"
            "While comparing ['y']: sequence not as expected:\n"
            "\n"
            "same:\n"
            "(4, 5)\n"
            "\n"
            "first:\n"
            "(6,)\n"
            "\n"
            "second:\n"
            "(7,)"
            )

    def test_deep_breadcrumbs(self):
        obj1 = singleton('obj1')
        obj2 = singleton('obj2')
        gen1 = generator(obj1, obj2)
        gen2 = generator(obj1, )
        # dict -> list -> tuple -> generator
        self.check_raises(
            dict(x=[1, ('a', 'b', gen1), 3], y=[3, 4]),
            dict(x=[1, ('a', 'b', gen2), 3], y=[3, 4]), (
                "dict not as expected:\n"
                "\n"
                "same:\n"
                "['y']\n"
                "\n"
                "values differ:\n"
                "'x': [1, ('a', 'b', {gen1}), 3] != [1, ('a', 'b', {gen2}), 3]"
                "\n\n"
                "While comparing ['x']: sequence not as expected:\n"
                "\n"
                "same:\n"
                "[1]\n"
                "\n"
                "first:\n"
                "[('a', 'b', {gen1}), 3]\n"
                "\n"
                "second:\n"
                "[('a', 'b', {gen2}), 3]\n"
                "\n"
                "While comparing ['x'][1]: sequence not as expected:\n"
                "\n"
                "same:\n"
                "('a', 'b')\n"
                "\n"
                "first:\n"
                "({gen1},)\n"
                "\n"
                "second:\n"
                "({gen2},)\n"
                "\n"
                "While comparing ['x'][1][2]: sequence not as expected:\n"
                "\n"
                "same:\n"
                "(<obj1>,)\n"
                "\n"
                "first:\n"
                "(<obj2>,)\n"
                "\n"
                "second:\n"
                "()"
                ).format(gen1=hexsub(repr(gen1)),
                         gen2=hexsub(repr(gen2)))
            )

    def test_nested_labels(self):
        obj1 = singleton('obj1')
        obj2 = singleton('obj2')
        gen1 = generator(obj1, obj2)
        gen2 = generator(obj1, )
        # dict -> list -> tuple -> generator
        self.check_raises(
            dict(x=[1, ('a', 'b', gen1), 3], y=[3, 4]),
            dict(x=[1, ('a', 'b', gen2), 3], y=[3, 4]), (
                "dict not as expected:\n"
                "\n"
                "same:\n"
                "['y']\n"
                "\n"
                "values differ:\n"
                "'x': [1, ('a', 'b', {gen1}), 3] (expected) != "
                "[1, ('a', 'b', {gen2}), 3] (actual)\n"
                "\n"
                "While comparing ['x']: sequence not as expected:\n"
                "\n"
                "same:\n"
                "[1]\n"
                "\n"
                "expected:\n"
                "[('a', 'b', {gen1}), 3]\n"
                "\n"
                "actual:\n"
                "[('a', 'b', {gen2}), 3]\n"
                "\n"
                "While comparing ['x'][1]: sequence not as expected:\n"
                "\n"
                "same:\n"
                "('a', 'b')\n"
                "\n"
                "expected:\n"
                "({gen1},)\n"
                "\n"
                "actual:\n"
                "({gen2},)\n"
                "\n"
                "While comparing ['x'][1][2]: sequence not as expected:\n"
                "\n"
                "same:\n"
                "(<obj1>,)\n"
                "\n"
                "expected:\n"
                "(<obj2>,)\n"
                "\n"
                "actual:\n"
                "()"
                ).format(gen1=hexsub(repr(gen1)),
                         gen2=hexsub(repr(gen2))),
            x_label='expected',
            y_label='actual',
            )

    def test_nested_strict_only_type_difference(self):
        MyTuple = namedtuple('MyTuple', 'x y z')
        type_repr = repr(MyTuple)
        tuple_repr = repr(tuple)
        self.check_raises(
            [MyTuple(1, 2, 3)],
            [(1, 2, 3)],
            ("sequence not as expected:\n"
             "\n"
             "same:\n"
             "[]\n"
             "\n"
             "first:\n"
             "[MyTuple(x=1, y=2, z=3)]\n"
             "\n"
             "second:\n"
             "[(1, 2, 3)]\n"
             "\n"
             "While comparing [0]: MyTuple(x=1, y=2, z=3) "
             "(%s) "
             "!= (1, 2, 3) "
             "(%s)") % (type_repr, tuple_repr),
            strict=True
            )

    def test_strict_nested_different(self):
        if py_2:
            expected = "[1, 2] (<type 'list'>) != (1, 3) (<type 'tuple'>)"
        else:
            expected = "[1, 2] (<class 'list'>) != (1, 3) (<class 'tuple'>)"

        self.check_raises(
            (1, 2, [1, 2]), (1, 2, (1, 3)),
            "sequence not as expected:\n"
            "\n"
            "same:\n"
            "(1, 2)\n"
            "\n"
            "first:\n"
            "([1, 2],)\n"
            "\n"
            "second:\n"
            "((1, 3),)"
            "\n\n"
            "While comparing [2]: " + expected,
            strict=True,
            )

    def test_namedtuple_equal(self):
        class_ = namedtuple('Foo', 'x')
        compare(class_(1), class_(1))

    def test_namedtuple_same_type(self):
        class_ = namedtuple('Foo', 'x y')
        self.check_raises(
            class_(1, 2), class_(1, 3),
            "Foo not as expected:\n\n"
            "same:\n"
            "['x']\n\n"
            "values differ:\n"
            "'y': 2 != 3"
            )

    def test_namedtuple_different_type(self):
        class_a = namedtuple('Foo', 'x y')
        class_b = namedtuple('Bar', 'x y z')
        self.check_raises(
            class_a(1, 2), class_b(1, 2, 3),
            "Foo(x=1, y=2) (<class 'testfixtures.tests.test_compare.Foo'>) != "
            "Bar(x=1, y=2, z=3) "
            "(<class 'testfixtures.tests.test_compare.Bar'>)"
            )

    def test_dict_with_list(self):
        self.check_raises(
            {1: 'one', 2: 'two'}, [1, 2],
            "{1: 'one', 2: 'two'} != [1, 2]"
        )

    def test_explicit_expected(self):
        self.check_raises('x', expected='y',
                          message="'y' (expected) != 'x' (actual)")

    def test_explicit_actual(self):
        self.check_raises('x', actual='y',
                          message="'x' (expected) != 'y' (actual)")

    def test_explicit_both(self):
        self.check_raises(message="'x' (expected) != 'y' (actual)",
                          expected='x', actual='y')

    def test_explicit_and_labels(self):
        self.check_raises(message="'x' (x_label) != 'y' (y_label)",
                          expected='x', actual='y',
                          x_label='x_label', y_label='y_label')

    def test_invalid_two_args_expected(self):
        with ShouldRaise(TypeError(
                "Exactly two objects needed, you supplied: ['z', 'x', 'y']"
        )):
            compare('x', 'y', expected='z')

    def test_invalid_two_args_actual(self):
        with ShouldRaise(TypeError(
                "Exactly two objects needed, you supplied: ['x', 'y', 'z']"
        )):
            compare('x', 'y', actual='z')

    def test_invalid_zero_args(self):
        with ShouldRaise(TypeError(
                'Exactly two objects needed, you supplied: []'
        )):
            compare()

    def test_invalid_one_args(self):
        with ShouldRaise(TypeError(
                "Exactly two objects needed, you supplied: ['x']"
        )):
            compare('x')

    def test_invalid_three_args(self):
        with ShouldRaise(TypeError(
                "Exactly two objects needed, you supplied: ['x', 'y', 'z']"
        )):
            compare('x', 'y', 'z')

    def test_dont_raise(self):
        self.assertEqual(compare('x', 'y', raises=False), "'x' != 'y'")

    class OrmObj(object):
        def __init__(self, a):
            self.a = a
        def __eq__(self, other):
            return True
        def __repr__(self):
            return 'OrmObj: '+str(self.a)

    def test_django_orm_is_horrible(self):

        self.assertTrue(self.OrmObj(1) == self.OrmObj(2))

        def query_set():
            yield self.OrmObj(1)
            yield self.OrmObj(2)

        def compare_orm_obj(x, y, context):
            if x.a != y.a:
                return 'OrmObj: %s != %s' % (x.a, y.a)

        self.check_raises(
            message=(
                "sequence not as expected:\n\n"
                "same:\n(OrmObj: 1,)\n\n"
                "expected:\n(OrmObj: 3,)\n\n"
                "actual:\n(OrmObj: 2,)\n\n"
                "While comparing [1]: OrmObj: 3 != 2"
            ),
            expected=[self.OrmObj(1), self.OrmObj(3)],
            actual=query_set(),
            comparers={self.OrmObj: compare_orm_obj},
            ignore_eq=True
        )

    def test_django_orm_is_horrible_part_2(self):

        def compare_orm_obj(x, y, context):
            return context.different(x.a, y.a, '.a')

        t_compare = partial(compare,
                            comparers={self.OrmObj: compare_orm_obj},
                            ignore_eq=True)

        t_compare(self.OrmObj(1), self.OrmObj(1))
        t_compare(self.OrmObj('some longish string'),
                  self.OrmObj('some longish string'))
        t_compare(self.OrmObj(date(2016, 1, 1)),
                  self.OrmObj(date(2016, 1, 1)))

    def test_django_orm_is_horrible_part_3(self):
        self.check_raises(
            message=(
                "OrmObj: 1 (expected) != OrmObj: 1 (actual)"
            ),
            expected=self.OrmObj(1),
            actual=self.OrmObj(1),
            ignore_eq=True
        )

    def test_django_orm_is_horrible_part_4(self):
        self.check_raises(
            message='[1] (expected) != 2 (actual)',
            expected=[1],
            actual=2,
            ignore_eq=True
        )