import ast
import pytest

from mutable_defaults import MutableDefaultChecker


@pytest.mark.parametrize('code,error_count', [
    ('def foo(bar={}): pass', 1),
    ('def foo(bar=[]): pass', 1),
    ('def foo(): pass', 0),
    ('def foo(a, b, c=False): pass', 0),
    (
        '\n'.join([
            'def foo():',
            '    def bar(a={}):',
            '        pass',
            '    pass',
        ]),
        1
    ),
    ('def foo(bar=[], baz={}): pass', 2),
    ('def foo(bar=range(10)): pass', 1),
    ('def foo(bar=set()): pass', 1),
    (
        '\n'.join([
            'def foo():',
            '    return True',
            'def bar(a=foo()):',
            '    pass',
        ]),
        1
    ),
    ('', 0),
], ids=(
    'dict',
    'list',
    'empty_arg_list',
    'valid_args_and_kwargs',
    'nested_function',
    'multiple_mutable_defaults',
    'builtin_callable_with_value',
    'builtin_callable_without_value',
    'user_defined_callable',
    'empty_tree',
))
def test_mutable_defaults(code, error_count):
    tree = ast.parse(code)
    assert (
        len(list(MutableDefaultChecker(tree, 'filename').run())) ==
        error_count
    )


@pytest.mark.parametrize('code,location_list', [
    ('def foo(bar={}): pass', [(1, 12)]),
    ('def foo(bar=[]): pass', [(1, 12)]),
    (
        '\n'.join([
            'def foo():',
            '    def bar(a={}):',
            '        pass',
            '    pass',
        ]),
        [(2, 14)]
    ),
    ('def foo(bar=[], baz={}): pass', [(1, 12), (1, 20)]),
    ('def foo(bar=range(10)): pass', [(1, 12)]),
    ('def foo(bar=set()): pass', [(1, 12)]),
    (
        '\n'.join([
            'def foo():',
            '    return True',
            'def bar(a=foo()):',
            '    pass',
        ]),
        [(3, 10)]
    ),
    (
        '\n'.join([
            'def foo(bar=[],',
            '        baz={}):',
            '    pass',
        ]),
        [(1, 12), (2, 12)]
    ),
], ids=(
    'dict',
    'list',
    'nested_function',
    'multiple_mutable_defaults',
    'builtin_callable_with_value',
    'builtin_callable_without_value',
    'user_defined_callable',
    'multiple_line_function_def',
))
def test_mutable_defaults_location(code, location_list):
    tree = ast.parse(code)
    assert (
        location_list ==
        [(e[0], e[1]) for e in MutableDefaultChecker(tree, 'filename').run()]
    )