"""
测试配置读取功能。
使用 mock 配置文件，不依赖真实 config.json。
"""

from unittest.mock import patch

import pytest

from paste.core import config


class TestConfiguration:
    """配置管理测试"""

    def test_load_config_with_mock_file(self, temp_config_file):
        """使用临时配置文件测试加载"""
        with patch.object(config, 'load_config', wraps=config.load_config):
            # 模拟配置文件路径
            with patch('paste.core.config.os.path.abspath') as mock_abspath:
                mock_abspath.return_value = str(temp_config_file)
                cfg = config.load_config()
                assert isinstance(cfg, dict)
                assert 'db_engine' in cfg

    def test_get_config_by_path_existing(self, mock_config_dict):
        """测试读取存在的配置项"""
        with patch('paste.core.config.GLOBAL_CONFIG', mock_config_dict):
            result = config.get_config_by_path('db_engine.engine')
            assert result == "sqlite+pysqlite:///:memory:"

    def test_get_config_by_path_nested(self, mock_config_dict):
        """测试读取深层嵌套配置"""
        with patch('paste.core.config.GLOBAL_CONFIG', mock_config_dict):
            result = config.get_config_by_path('redis.connection.url')
            assert result == "redis://localhost:6379/15"

    def test_get_config_by_path_with_default(self, mock_config_dict):
        """测试带默认值的配置读取"""
        with patch('paste.core.config.GLOBAL_CONFIG', mock_config_dict):
            result = config.get_config_by_path('nonexistent.key', default='fallback')
            assert result == 'fallback'

    def test_get_config_by_path_missing_without_default(self, mock_config_dict):
        """测试缺失配置项且无默认值时抛出异常"""
        with patch('paste.core.config.GLOBAL_CONFIG', mock_config_dict):
            with pytest.raises(AssertionError):
                config.get_config_by_path('nonexistent.key')

    def test_get_config_shortcut(self, mock_config_dict):
        """测试 get_config 快捷方法"""
        with patch('paste.core.config.GLOBAL_CONFIG', mock_config_dict):
            result = config.get_config('tornado.demo.port')
            assert result == 9000

    def test_get_config_default_none(self, mock_config_dict):
        """测试 get_config 默认值 None 的情况"""
        with patch('paste.core.config.GLOBAL_CONFIG', mock_config_dict):
            with pytest.raises(AssertionError):
                config.get_config('completely.nonexistent')