import os
from unittest.mock import patch

import pytest

from scouter.utils.connectors_config import (
    build_druid_config,
    build_kafka_config,
    build_mongodb_config,
    build_postgres_config,
    build_redis_config,
)


@pytest.fixture
def mock_env_vars():
    with patch.dict(os.environ, {}, clear=True):
        yield


@pytest.mark.usefixtures('mock_env_vars')
def test_build_postgres_config_defaults():
    """Test that build_postgres_config returns default values when no env vars are set"""
    config = build_postgres_config()

    assert config == {
        'host': 'localhost',
        'port': 5432,
        'user': 'sientia',
        'password': 'sientia',
        'dbname': 'sientia',
        'min_connections': 5,
        'max_connections': 20,
    }


@pytest.mark.usefixtures('mock_env_vars')
def test_build_postgres_config_with_env_vars():
    """Test that build_postgres_config uses env vars when set"""
    with patch.dict(
        os.environ,
        {
            'POSTGRES_HOST': 'db.example.com',
            'POSTGRES_PORT': '5433',
            'POSTGRES_USER': 'admin',
            'POSTGRES_PASSWORD': 'secret',
            'POSTGRES_DBNAME': 'test_db',
            'POSTGRES_MIN_CONNECTIONS': '3',
            'POSTGRES_MAX_CONNECTIONS': '15',
        },
    ):
        config = build_postgres_config()

        assert config == {
            'host': 'db.example.com',
            'port': 5433,
            'user': 'admin',
            'password': 'secret',
            'dbname': 'test_db',
            'min_connections': 3,
            'max_connections': 15,
        }


@pytest.mark.usefixtures('mock_env_vars')
def test_build_kafka_config_defaults():
    """Test that build_kafka_config returns default values when no env vars are set"""
    config = build_kafka_config()

    assert config == {
        'bootstrap_servers': 'localhost:9092',
        'polling_time': 1000,
        'group_id': 'scouter-group',
    }


@pytest.mark.usefixtures('mock_env_vars')
def test_build_kafka_config_with_env_vars():
    """Test that build_kafka_config uses env vars when set"""
    with patch.dict(
        os.environ,
        {'KAFKA_BOOTSTRAP_SERVERS': 'kafka.example.com:9092', 'KAFKA_POLLING_TIME': '5000'},
    ):
        config = build_kafka_config()

        assert config == {
            'bootstrap_servers': 'kafka.example.com:9092',
            'polling_time': 5000,
            'group_id': 'scouter-group',
        }


@pytest.mark.usefixtures('mock_env_vars')
def test_build_redis_config_defaults():
    """Test that build_redis_config returns default values when no env vars are set"""
    config = build_redis_config()

    assert config == {'host': 'localhost', 'port': 6379, 'username': None, 'password': None}


@pytest.mark.usefixtures('mock_env_vars')
def test_build_redis_config_with_env_vars():
    """Test that build_redis_config uses env vars when set"""
    with patch.dict(
        os.environ,
        {
            'REDIS_HOST': 'redis.example.com',
            'REDIS_PORT': '6380',
            'REDIS_USERNAME': 'test',
            'REDIS_PASSWORD': 'test',
        },
    ):
        config = build_redis_config()

        assert config == {
            'host': 'redis.example.com',
            'port': 6380,
            'username': 'test',
            'password': 'test',
        }


def test_build_mongodb_config_defaults():
    """Test that build_mongodb_config returns default values when no env vars are set"""
    config = build_mongodb_config()

    assert config == {
        'connection_string': 'mongodb://sientia:sientia@localhost:27017',  # NOSONAR
        'database_name': 'sientia',
    }


def test_build_mongodb_config_with_env_vars():
    """Test that build_mongodb_config uses env vars when set"""
    with patch.dict(
        os.environ,
        {
            'MONGODB_URL': 'mongodb.example.com:27017',
            'MONGODB_DATABASE_NAME': 'test_db',
            'MONGODB_USERNAME': 'test',
            'MONGODB_PASSWORD': 'test',
        },
    ):
        config = build_mongodb_config()

        assert config == {
            'connection_string': 'mongodb://test:test@mongodb.example.com:27017',
            'database_name': 'test_db',
        }


def test_build_druid_config_defaults():
    """Test that build_druid_config returns default values when no env vars are set"""
    config = build_druid_config()

    assert config == {'host': 'localhost', 'port': 8082}


def test_build_druid_config_with_env_vars():
    """Test that build_druid_config uses env vars when set"""
    with patch.dict(os.environ, {'DRUID_HOST': 'druid.example.com', 'DRUID_PORT': '8083'}):
        config = build_druid_config()

        assert config == {'host': 'druid.example.com', 'port': 8083}