#!/usr/bin/env python
#
# A library that provides a Python interface to the Telegram Bot API
# Copyright (C) 2015-2021
# Leandro Toledo de Souza <devs@python-telegram-bot.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser Public License for more details.
#
# You should have received a copy of the GNU Lesser Public License
# along with this program.  If not, see [http://www.gnu.org/licenses/].
import datetime
import inspect

import pytest
import pytz

from telegram import User, ChatMember, Chat, ChatMemberUpdated, ChatInviteLink
from telegram.utils.helpers import to_timestamp


@pytest.fixture(scope='class')
def user():
    return User(1, 'First name', False)


@pytest.fixture(scope='class')
def chat():
    return Chat(1, Chat.SUPERGROUP, 'Chat')


@pytest.fixture(scope='class')
def old_chat_member(user):
    return ChatMember(user, TestChatMemberUpdated.old_status)


@pytest.fixture(scope='class')
def new_chat_member(user):
    return ChatMember(user, TestChatMemberUpdated.new_status)


@pytest.fixture(scope='class')
def time():
    return datetime.datetime.now(tz=pytz.utc)


@pytest.fixture(scope='class')
def invite_link(user):
    return ChatInviteLink('link', user, True, True)


@pytest.fixture(scope='class')
def chat_member_updated(user, chat, old_chat_member, new_chat_member, invite_link, time):
    return ChatMemberUpdated(chat, user, time, old_chat_member, new_chat_member, invite_link)


class TestChatMemberUpdated:
    old_status = ChatMember.MEMBER
    new_status = ChatMember.ADMINISTRATOR

    def test_slot_behaviour(self, recwarn, mro_slots, chat_member_updated):
        action = chat_member_updated
        for attr in action.__slots__:
            assert getattr(action, attr, 'err') != 'err', f"got extra slot '{attr}'"
        assert not action.__dict__, f"got missing slot(s): {action.__dict__}"
        assert len(mro_slots(action)) == len(set(mro_slots(action))), "duplicate slot"
        action.custom = 'should give warning'
        assert len(recwarn) == 1 and 'custom' in str(recwarn[0].message), recwarn.list

    def test_de_json_required_args(self, bot, user, chat, old_chat_member, new_chat_member, time):
        json_dict = {
            'chat': chat.to_dict(),
            'from': user.to_dict(),
            'date': to_timestamp(time),
            'old_chat_member': old_chat_member.to_dict(),
            'new_chat_member': new_chat_member.to_dict(),
        }

        chat_member_updated = ChatMemberUpdated.de_json(json_dict, bot)

        assert chat_member_updated.chat == chat
        assert chat_member_updated.from_user == user
        assert pytest.approx(chat_member_updated.date == time)
        assert to_timestamp(chat_member_updated.date) == to_timestamp(time)
        assert chat_member_updated.old_chat_member == old_chat_member
        assert chat_member_updated.new_chat_member == new_chat_member
        assert chat_member_updated.invite_link is None

    def test_de_json_all_args(
        self, bot, user, time, invite_link, chat, old_chat_member, new_chat_member
    ):
        json_dict = {
            'chat': chat.to_dict(),
            'from': user.to_dict(),
            'date': to_timestamp(time),
            'old_chat_member': old_chat_member.to_dict(),
            'new_chat_member': new_chat_member.to_dict(),
            'invite_link': invite_link.to_dict(),
        }

        chat_member_updated = ChatMemberUpdated.de_json(json_dict, bot)

        assert chat_member_updated.chat == chat
        assert chat_member_updated.from_user == user
        assert pytest.approx(chat_member_updated.date == time)
        assert to_timestamp(chat_member_updated.date) == to_timestamp(time)
        assert chat_member_updated.old_chat_member == old_chat_member
        assert chat_member_updated.new_chat_member == new_chat_member
        assert chat_member_updated.invite_link == invite_link

    def test_to_dict(self, chat_member_updated):
        chat_member_updated_dict = chat_member_updated.to_dict()
        assert isinstance(chat_member_updated_dict, dict)
        assert chat_member_updated_dict['chat'] == chat_member_updated.chat.to_dict()
        assert chat_member_updated_dict['from'] == chat_member_updated.from_user.to_dict()
        assert chat_member_updated_dict['date'] == to_timestamp(chat_member_updated.date)
        assert (
            chat_member_updated_dict['old_chat_member']
            == chat_member_updated.old_chat_member.to_dict()
        )
        assert (
            chat_member_updated_dict['new_chat_member']
            == chat_member_updated.new_chat_member.to_dict()
        )
        assert chat_member_updated_dict['invite_link'] == chat_member_updated.invite_link.to_dict()

    def test_equality(self, time, old_chat_member, new_chat_member, invite_link):
        a = ChatMemberUpdated(
            Chat(1, 'chat'),
            User(1, '', False),
            time,
            old_chat_member,
            new_chat_member,
            invite_link,
        )
        b = ChatMemberUpdated(
            Chat(1, 'chat'), User(1, '', False), time, old_chat_member, new_chat_member
        )
        # wrong date
        c = ChatMemberUpdated(
            Chat(1, 'chat'),
            User(1, '', False),
            time + datetime.timedelta(hours=1),
            old_chat_member,
            new_chat_member,
        )
        # wrong chat & form_user
        d = ChatMemberUpdated(
            Chat(42, 'wrong_chat'),
            User(42, 'wrong_user', False),
            time,
            old_chat_member,
            new_chat_member,
        )
        # wrong old_chat_member
        e = ChatMemberUpdated(
            Chat(1, 'chat'),
            User(1, '', False),
            time,
            ChatMember(User(1, '', False), ChatMember.CREATOR),
            new_chat_member,
        )
        # wrong new_chat_member
        f = ChatMemberUpdated(
            Chat(1, 'chat'),
            User(1, '', False),
            time,
            old_chat_member,
            ChatMember(User(1, '', False), ChatMember.CREATOR),
        )
        # wrong type
        g = ChatMember(User(1, '', False), ChatMember.CREATOR)

        assert a == b
        assert hash(a) == hash(b)
        assert a is not b

        for other in [c, d, e, f, g]:
            assert a != other
            assert hash(a) != hash(other)

    def test_difference_required(self, user, chat):
        old_chat_member = ChatMember(user, 'old_status')
        new_chat_member = ChatMember(user, 'new_status')
        chat_member_updated = ChatMemberUpdated(
            chat, user, datetime.datetime.utcnow(), old_chat_member, new_chat_member
        )
        assert chat_member_updated.difference() == {'status': ('old_status', 'new_status')}

        # We deliberately change an optional argument here to make sure that comparision doesn't
        # just happens by id/required args
        new_user = User(1, 'First name', False, last_name='last name')
        new_chat_member.user = new_user
        assert chat_member_updated.difference() == {
            'status': ('old_status', 'new_status'),
            'user': (user, new_user),
        }

    @pytest.mark.parametrize(
        'optional_attribute',
        # This gives the names of all optional arguments of ChatMember
        [
            name
            for name, param in inspect.signature(ChatMember).parameters.items()
            if name != 'self' and param.default != inspect.Parameter.empty
        ],
    )
    def test_difference_optionals(self, optional_attribute, user, chat):
        # we use datetimes here, because we need that for `until_date` and it doesn't matter for
        # the other attributes
        old_value = datetime.datetime(2020, 1, 1)
        new_value = datetime.datetime(2021, 1, 1)
        old_chat_member = ChatMember(user, 'status', **{optional_attribute: old_value})
        new_chat_member = ChatMember(user, 'status', **{optional_attribute: new_value})
        chat_member_updated = ChatMemberUpdated(
            chat, user, datetime.datetime.utcnow(), old_chat_member, new_chat_member
        )
        assert chat_member_updated.difference() == {optional_attribute: (old_value, new_value)}