# -*- coding: utf-8 -*-
# Copyright (c) 2013-2014 Google, Inc.
# Copyright (c) 2013-2014 LOGILAB S.A. (Paris, FRANCE) <contact@logilab.fr>
# Copyright (c) 2014 Arun Persaud <arun@nubati.net>
# Copyright (c) 2015-2017 Claudiu Popa <pcmanticore@gmail.com>
# Copyright (c) 2015 Aru Sahni <arusahni@gmail.com>
# Copyright (c) 2015 Ionel Cristian Maries <contact@ionelmc.ro>
# Copyright (c) 2016 Derek Gustafson <degustaf@gmail.com>
# Copyright (c) 2016 Glenn Matthews <glenn@e-dad.net>
# Copyright (c) 2017 ttenhoeve-aa <ttenhoeve@appannie.com>
# Copyright (c) 2017 Anthony Sottile <asottile@umich.edu>
# Copyright (c) 2017 Łukasz Rogalski <rogalski.91@gmail.com>

# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/master/COPYING

import io
import re
import warnings

import astroid

from pylint import utils
from pylint.checkers.utils import check_messages, get_node_last_lineno
from pylint.exceptions import InvalidMessageError
import pytest


class TestPyLintASTWalker(object):
    class MockLinter(object):
        def __init__(self, msgs):
            self._msgs = msgs

        def is_message_enabled(self, msgid):
            return self._msgs.get(msgid, True)

    class Checker(object):
        def __init__(self):
            self.called = set()

        @check_messages('first-message')
        def visit_module(self, module):
            self.called.add('module')

        @check_messages('second-message')
        def visit_call(self, module):
            raise NotImplementedError

        @check_messages('second-message', 'third-message')
        def visit_assignname(self, module):
            self.called.add('assignname')

        @check_messages('second-message')
        def leave_assignname(self, module):
            raise NotImplementedError

    def test_check_messages(self):
        linter = self.MockLinter({'first-message': True,
                                  'second-message': False,
                                  'third-message': True})
        walker = utils.PyLintASTWalker(linter)
        checker = self.Checker()
        walker.add_checker(checker)
        walker.walk(astroid.parse("x = func()"))
        assert {'module', 'assignname'} == checker.called

    def test_deprecated_methods(self):
        class Checker(object):
            def __init__(self):
                self.called = False

            @check_messages('first-message')
            def visit_assname(self, node):
                self.called = True

        linter = self.MockLinter({'first-message': True})
        walker = utils.PyLintASTWalker(linter)
        checker = Checker()
        walker.add_checker(checker)
        with warnings.catch_warnings(record=True):
            warnings.simplefilter('always')
            walker.walk(astroid.parse("x = 1"))

            assert not checker.called


def test__basename_in_blacklist_re_match():
    patterns = [re.compile(".*enchilada.*"), re.compile("unittest_.*")]
    assert utils._basename_in_blacklist_re("unittest_utils.py", patterns)
    assert utils._basename_in_blacklist_re("cheese_enchiladas.xml", patterns)


def test__basename_in_blacklist_re_nomatch():
    patterns = [re.compile(".*enchilada.*"), re.compile("unittest_.*")]
    assert not utils._basename_in_blacklist_re("test_utils.py", patterns)
    assert not utils._basename_in_blacklist_re("enchilad.py", patterns)


@pytest.fixture
def store():
    return utils.MessagesStore()


@pytest.mark.parametrize("messages,expected", [
    ({'W1234': ('message one', 'msg-symbol-one', 'msg description'),
      'W4321': ('message two', 'msg-symbol-two', 'msg description')},
     r"Inconsistent checker part in message id 'W4321' (expected 'x12xx')"),

    ({'W1233': ('message two', 'msg-symbol-two', 'msg description',
                {'old_names': [('W1234', 'old-symbol')]}),
      'W1234': ('message one', 'msg-symbol-one', 'msg description')},
     "Message id 'W1234' is already defined"),

    ({'W1234': ('message one', 'msg-symbol-one', 'msg description'),
      'W1235': ('message two', 'msg-symbol-two', 'msg description',
                {'old_names': [('W1234', 'old-symbol')]})},
     "Message id 'W1234' is already defined"),

    ({'W1234': ('message one', 'msg-symbol-one', 'msg description',
                {'old_names': [('W1201', 'old-symbol-one')]}),
      'W1235': ('message two', 'msg-symbol-two', 'msg description',
                {'old_names': [('W1201', 'old-symbol-two')]})},
     "Message id 'W1201' is already defined"),
    ({'W1234': ('message one', 'msg-symbol', 'msg description'),
      'W1235': ('message two', 'msg-symbol', 'msg description')},
     "Message symbol 'msg-symbol' is already defined"),

    ({'W1233': ('message two', 'msg-symbol-two', 'msg description',
                {'old_names': [('W1230', 'msg-symbol-one')]}),
      'W1234': ('message one', 'msg-symbol-one', 'msg description')},
     "Message symbol 'msg-symbol-one' is already defined"),

    ({'W1234': ('message one', 'msg-symbol-one', 'msg description'),
      'W1235': ('message two', 'msg-symbol-two', 'msg description',
                {'old_names': [('W1230', 'msg-symbol-one')]})},
     "Message symbol 'msg-symbol-one' is already defined"),

    ({'W1234': ('message one', 'msg-symbol-one', 'msg description',
                {'old_names': [('W1230', 'old-symbol-one')]}),
      'W1235': ('message two', 'msg-symbol-two', 'msg description',
                {'old_names': [('W1231', 'old-symbol-one')]})},
     "Message alternate name 'old-symbol-one' is already defined"),

])
def test_register_error(store, messages, expected):
    class Checker(object):
        name = 'checker'
        msgs = messages
    with pytest.raises(InvalidMessageError) as cm:
        store.register_messages(Checker())
    assert str(cm.value) == expected


def test_register_error_new_id_duplicate_of_new(store):
    class CheckerOne(object):
        name = 'checker_one'
        msgs = {
            'W1234': ('message one', 'msg-symbol-one', 'msg description.'),
            }

    class CheckerTwo(object):
        name = 'checker_two'
        msgs = {
            'W1234': ('message two', 'msg-symbol-two', 'another msg description.'),
            }
    store.register_messages(CheckerOne())
    test_register_error(store,
                        {'W1234': ('message two', 'msg-symbol-two', 'another msg description.')},
                        "Message id 'W1234' is already defined")


@pytest.mark.parametrize("msgid,expected", [
    ("Q1234", "Bad message type Q in 'Q1234'"),
    ("W12345", "Invalid message id 'W12345'"),
])
def test_create_invalid_message_type(msgid, expected):
    with pytest.raises(InvalidMessageError) as cm:
        utils.MessageDefinition('checker', msgid,
                                'msg', 'descr', 'symbol', 'scope')
    assert str(cm.value) == expected


def test__decoding_readline():
    """_decoding_readline should yield line at a time even if the binary
    representation of the text is not splittable line-by-line.

    For convenience this test uses a codec that is easy to understand, though
    this *specific* codec is unlikely to be seen in the wild for files.
    """
    binary_io = io.BytesIO(b'foo\\nbaz\\n')
    readline = utils._decoding_readline(binary_io, 'unicode_escape')

    ret = []
    s = readline()
    while s != '':
        ret.append(s)
        s = readline()

    assert ret == ['foo\n', 'baz\n']


def test_decoding_stream_unknown_encoding():
    """decoding_stream should fall back to *some* decoding when given an
    unknown encoding.
    """
    binary_io = io.BytesIO(b'foo\nbar')
    stream = utils.decoding_stream(binary_io, 'garbage-encoding')
    # should still act like a StreamReader
    ret = stream.readlines()
    assert ret == ['foo\n', 'bar']


def test_decoding_stream_known_encoding():
    binary_io = io.BytesIO(u'€'.encode('cp1252'))
    stream = utils.decoding_stream(binary_io, 'cp1252')
    assert stream.read() == u'€'

class TestGetNodeLastLineno:

    def test_get_node_last_lineno_simple(self):
        node = astroid.extract_node("""
            pass
        """)
        assert get_node_last_lineno(node) == 2


    def test_get_node_last_lineno_if_simple(self):
        node = astroid.extract_node("""
            if True:
                print(1)
                pass
            """)
        assert get_node_last_lineno(node) == 4


    def test_get_node_last_lineno_if_elseif_else(self):
        node = astroid.extract_node("""
            if True:
                print(1)
            elif False:
                print(2)
            else:
                print(3)
            """)
        assert get_node_last_lineno(node) == 7


    def test_get_node_last_lineno_while(self):
        node = astroid.extract_node("""
            while True:
                print(1)
            """)
        assert get_node_last_lineno(node) == 3


    def test_get_node_last_lineno_while_else(self):
        node = astroid.extract_node("""
            while True:
                print(1)
            else:
                print(2)
            """)
        assert get_node_last_lineno(node) == 5


    def test_get_node_last_lineno_for(self):
        node = astroid.extract_node("""
            for x in range(0, 5):
                print(1)
            """)
        assert get_node_last_lineno(node) == 3


    def test_get_node_last_lineno_for_else(self):
        node = astroid.extract_node("""
            for x in range(0, 5):
                print(1)
            else:
                print(2)
            """)
        assert get_node_last_lineno(node) == 5


    def test_get_node_last_lineno_try(self):
        node = astroid.extract_node("""
            try:
                print(1)
            except ValueError:
                print(2)
            except Exception:
                print(3)
            """)
        assert get_node_last_lineno(node) == 7


    def test_get_node_last_lineno_try_except_else(self):
        node = astroid.extract_node("""
            try:
                print(1)
            except Exception:
                print(2)
                print(3)
            else:
                print(4)
            """)
        assert get_node_last_lineno(node) == 8


    def test_get_node_last_lineno_try_except_finally(self):
        node = astroid.extract_node("""
            try:
                print(1)
            except Exception:
                print(2)
            finally:
                print(4)
            """)
        assert get_node_last_lineno(node) == 7


    def test_get_node_last_lineno_try_except_else_finally(self):
        node = astroid.extract_node("""
            try:
                print(1)
            except Exception:
                print(2)
            else:
                print(3)
            finally:
                print(4)
            """)
        assert get_node_last_lineno(node) == 9


    def test_get_node_last_lineno_with(self):
        node = astroid.extract_node("""
            with x as y:
                print(1)
                pass
            """)
        assert get_node_last_lineno(node) == 4


    def test_get_node_last_lineno_method(self):
        node = astroid.extract_node("""
            def x(a, b):
                print(a, b)
                pass
            """)
        assert get_node_last_lineno(node) == 4


    def test_get_node_last_lineno_decorator(self):
        node = astroid.extract_node("""
            @decor()
            def x(a, b):
                print(a, b)
                pass
            """)
        assert get_node_last_lineno(node) == 5

    def test_get_node_last_lineno_class(self):
        node = astroid.extract_node("""
            class C(object):
                CONST = True

                def x(self, b):
                    print(b)

                def y(self):
                    pass
                    pass
            """)
        assert get_node_last_lineno(node) == 10


    def test_get_node_last_lineno_combined(self):
        node = astroid.extract_node("""
            class C(object):
                CONST = True

                def y(self):
                    try:
                        pass
                    except:
                        pass
                    finally:
                        pass
            """)
        assert get_node_last_lineno(node) == 11