#!/usr/bin/env python
#
# A library that provides a Python interface to the Telegram Bot API
# Copyright (C) 2015-2022
# 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 json as json_lib

import pytest

try:
    import ujson
except ImportError:
    ujson = None

from telegram import TelegramObject


class TestTelegramObject:
    def test_to_json_native(self, monkeypatch):
        if ujson:
            monkeypatch.setattr('ujson.dumps', json_lib.dumps)
        # to_json simply takes whatever comes from to_dict, therefore we only need to test it once
        telegram_object = TelegramObject()

        # Test that it works with a dict with str keys as well as dicts as lists as values
        d = {'str': 'str', 'str2': ['str', 'str'], 'str3': {'str': 'str'}}
        monkeypatch.setattr('telegram.TelegramObject.to_dict', lambda _: d)
        json = telegram_object.to_json()
        # Order isn't guarantied
        assert '"str": "str"' in json
        assert '"str2": ["str", "str"]' in json
        assert '"str3": {"str": "str"}' in json

        # Now make sure that it doesn't work with not json stuff and that it fails loudly
        # Tuples aren't allowed as keys in json
        d = {('str', 'str'): 'str'}

        monkeypatch.setattr('telegram.TelegramObject.to_dict', lambda _: d)
        with pytest.raises(TypeError):
            telegram_object.to_json()

    @pytest.mark.skipif(not ujson, reason='ujson not installed')
    def test_to_json_ujson(self, monkeypatch):
        # to_json simply takes whatever comes from to_dict, therefore we only need to test it once
        telegram_object = TelegramObject()

        # Test that it works with a dict with str keys as well as dicts as lists as values
        d = {'str': 'str', 'str2': ['str', 'str'], 'str3': {'str': 'str'}}
        monkeypatch.setattr('telegram.TelegramObject.to_dict', lambda _: d)
        json = telegram_object.to_json()
        # Order isn't guarantied and ujon discards whitespace
        assert '"str":"str"' in json
        assert '"str2":["str","str"]' in json
        assert '"str3":{"str":"str"}' in json

        # Test that ujson allows tuples
        # NOTE: This could be seen as a bug (since it's differnt from the normal "json",
        # but we test it anyways
        d = {('str', 'str'): 'str'}

        monkeypatch.setattr('telegram.TelegramObject.to_dict', lambda _: d)
        telegram_object.to_json()

    def test_to_dict_private_attribute(self):
        class TelegramObjectSubclass(TelegramObject):
            __slots__ = ('a', '_b')  # Added slots so that the attrs are converted to dict

            def __init__(self):
                self.a = 1
                self._b = 2

        subclass_instance = TelegramObjectSubclass()
        assert subclass_instance.to_dict() == {'a': 1}

    def test_slot_behaviour(self, mro_slots):
        inst = TelegramObject()
        for attr in inst.__slots__:
            assert getattr(inst, attr, 'err') != 'err', f"got extra slot '{attr}'"
        assert len(mro_slots(inst)) == len(set(mro_slots(inst))), "duplicate slot"

    def test_meaningless_comparison(self, recwarn):
        expected_warning = "Objects of type TGO can not be meaningfully tested for equivalence."

        class TGO(TelegramObject):
            pass

        a = TGO()
        b = TGO()
        assert a == b
        assert len(recwarn) == 1
        assert str(recwarn[0].message) == expected_warning
        assert recwarn[0].filename == __file__, "wrong stacklevel"

    def test_meaningful_comparison(self, recwarn):
        class TGO(TelegramObject):
            def __init__(self):
                self._id_attrs = (1,)

        a = TGO()
        b = TGO()
        assert a == b
        assert len(recwarn) == 0
        assert b == a
        assert len(recwarn) == 0

    def test_bot_instance_none(self):
        tg_object = TelegramObject()
        with pytest.raises(RuntimeError):
            tg_object.get_bot()

    @pytest.mark.parametrize('bot_inst', ['bot', None])
    def test_bot_instance_states(self, bot_inst):
        tg_object = TelegramObject()
        tg_object.set_bot('bot' if bot_inst == 'bot' else bot_inst)
        if bot_inst == 'bot':
            assert tg_object.get_bot() == 'bot'
        elif bot_inst is None:
            with pytest.raises(RuntimeError):
                tg_object.get_bot()