# Copyright (c) 2015 Nicolas JOUANIN
#
# See the file license.txt for copying permission.

import pytest

from amqtt.plugins.manager import BaseContext
from amqtt.plugins.topic_checking import (
    BaseTopicPlugin,
    TopicTabooPlugin,
    TopicAccessControlListPlugin,
)
from amqtt.session import Session


class DummyLogger(object):
    def __init__(self):
        self.messages = []

    def warning(self, *args, **kwargs):
        self.messages.append((args, kwargs))


# Base plug-in object


@pytest.mark.asyncio
async def test_base_no_config():
    """
    Check BaseTopicPlugin returns false if no topic-check is present.
    """
    context = BaseContext()
    context.logger = DummyLogger()
    context.config = {}

    plugin = BaseTopicPlugin(context)
    authorised = plugin.topic_filtering()
    assert authorised is False

    # Should have printed a couple of warnings
    assert len(context.logger.messages) == 2
    assert context.logger.messages[0] == (
        ("'topic-check' section not found in context configuration",),
        {},
    )
    assert context.logger.messages[1] == (
        ("'auth' section not found in context configuration",),
        {},
    )


@pytest.mark.asyncio
async def test_base_empty_config():
    """
    Check BaseTopicPlugin returns false if topic-check is empty.
    """
    context = BaseContext()
    context.logger = DummyLogger()
    context.config = {"topic-check": {}}

    plugin = BaseTopicPlugin(context)
    authorised = plugin.topic_filtering()
    assert authorised is False

    # Should NOT have printed warnings
    assert len(context.logger.messages) == 1
    assert context.logger.messages[0] == (
        ("'auth' section not found in context configuration",),
        {},
    )


@pytest.mark.asyncio
async def test_base_enabled_config():
    """
    Check BaseTopicPlugin returns true if enabled.
    """
    context = BaseContext()
    context.logger = DummyLogger()
    context.config = {"topic-check": {"enabled": True}}

    plugin = BaseTopicPlugin(context)
    authorised = plugin.topic_filtering()
    assert authorised is True

    # Should NOT have printed warnings
    assert len(context.logger.messages) == 0


# Taboo plug-in


@pytest.mark.asyncio
async def test_taboo_empty_config():
    """
    Check TopicTabooPlugin returns false if topic-check absent.
    """
    context = BaseContext()
    context.logger = DummyLogger()
    context.config = {}

    plugin = TopicTabooPlugin(context)
    authorised = await plugin.topic_filtering()
    assert authorised is False

    # Should have printed a couple of warnings
    assert len(context.logger.messages) == 2
    assert context.logger.messages[0] == (
        ("'topic-check' section not found in context configuration",),
        {},
    )
    assert context.logger.messages[1] == (
        ("'auth' section not found in context configuration",),
        {},
    )


@pytest.mark.asyncio
async def test_taboo_not_taboo_topic():
    """
    Check TopicTabooPlugin returns true if topic not taboo
    """
    context = BaseContext()
    context.logger = DummyLogger()
    context.config = {"topic-check": {"enabled": True}}

    session = Session()
    session.username = "anybody"

    plugin = TopicTabooPlugin(context)
    authorised = await plugin.topic_filtering(session=session, topic="not/prohibited")
    assert authorised is True

    # Should NOT have printed warnings
    assert len(context.logger.messages) == 0


@pytest.mark.asyncio
async def test_taboo_anon_taboo_topic():
    """
    Check TopicTabooPlugin returns false if topic is taboo and session is anonymous.
    """
    context = BaseContext()
    context.logger = DummyLogger()
    context.config = {"topic-check": {"enabled": True}}

    session = Session()
    session.username = ""

    plugin = TopicTabooPlugin(context)
    authorised = await plugin.topic_filtering(session=session, topic="prohibited")
    assert authorised is False

    # Should NOT have printed warnings
    assert len(context.logger.messages) == 0


@pytest.mark.asyncio
async def test_taboo_notadmin_taboo_topic():
    """
    Check TopicTabooPlugin returns false if topic is taboo and user is not "admin".
    """
    context = BaseContext()
    context.logger = DummyLogger()
    context.config = {"topic-check": {"enabled": True}}

    session = Session()
    session.username = "notadmin"

    plugin = TopicTabooPlugin(context)
    authorised = await plugin.topic_filtering(session=session, topic="prohibited")
    assert authorised is False

    # Should NOT have printed warnings
    assert len(context.logger.messages) == 0


@pytest.mark.asyncio
async def test_taboo_admin_taboo_topic():
    """
    Check TopicTabooPlugin returns true if topic is taboo and user is "admin".
    """
    context = BaseContext()
    context.logger = DummyLogger()
    context.config = {"topic-check": {"enabled": True}}

    session = Session()
    session.username = "admin"

    plugin = TopicTabooPlugin(context)
    authorised = await plugin.topic_filtering(session=session, topic="prohibited")
    assert authorised is True

    # Should NOT have printed warnings
    assert len(context.logger.messages) == 0


def test_topic_ac_not_match():
    """
    Test TopicAccessControlListPlugin.topic_ac returns false if topics do not match.
    """
    assert (
        TopicAccessControlListPlugin.topic_ac("a/topic/to/match", "a/topic/to/notmatch")
        is False
    )


def test_topic_ac_not_match_longer_acl():
    """
    Test TopicAccessControlListPlugin.topic_ac returns false if topics do not match and ACL topic is longer.
    """
    assert (
        TopicAccessControlListPlugin.topic_ac("topic", "topic/is/longer") is False
    )


def test_topic_ac_not_match_longer_rq():
    """
    Test TopicAccessControlListPlugin.topic_ac returns false if topics do not match and RQ topic is longer.
    """
    assert (
        TopicAccessControlListPlugin.topic_ac("topic/is/longer", "topic") is False
    )


def test_topic_ac_match_exact():
    """
    Test TopicAccessControlListPlugin.topic_ac returns true if topics match exactly.
    """
    assert TopicAccessControlListPlugin.topic_ac("exact/topic", "exact/topic") is True


def test_topic_ac_match_hash():
    """
    Test TopicAccessControlListPlugin.topic_ac correctly handles '+' wildcard.
    """
    assert (
        TopicAccessControlListPlugin.topic_ac(
            "a/topic/anything/value", "a/topic/+/value"
        )
        is True
    )


def test_topic_ac_match_hash():
    """
    Test TopicAccessControlListPlugin.topic_ac correctly handles '#' wildcard.
    """
    assert (
        TopicAccessControlListPlugin.topic_ac(
            "topic/prefix/and/suffix", "topic/prefix/#"
        )
        is True
    )