"""
统一配置管理系统

提供集中化、类型安全、环境感知的配置管理能力
"""

import threading
from typing import Any

from .exceptions import (
    ConfigException,
    ConfigFileError,
    ConfigNotFoundError,
    ConfigTypeError,
    ConfigValidationError,
    SensitiveConfigError,
)

# 导入新的配置管理组件
from .manager import ConfigChangeListener, ConfigManager
from .providers.base import ConfigProvider
from .providers.env import EnvProvider
from .providers.yaml import YamlProvider
from .schema.field import ConfigField
from .schema.registry import CONFIG_REGISTRY, get_config_field
from .schema.schema import ConfigSchema
from .utils import (
    get_case_chat_config,
    get_config_value,
    get_court_sms_config,
    get_document_processing_config,
    get_feishu_config,
    is_config_manager_available,
    migrate_legacy_config_access,
    register_config_change_listener,
)

# 全局配置管理器实例（线程安全）
_global_config_manager: ConfigManager | None = None
_global_config_lock = threading.Lock()


def get_config_manager() -> ConfigManager:
    """获取全局配置管理器实例（线程安全单例）"""
    global _global_config_manager
    if _global_config_manager is not None:
        return _global_config_manager
    with _global_config_lock:
        if _global_config_manager is not None:
            return _global_config_manager
        _global_config_manager = ConfigManager()
        schema = ConfigSchema()
        for _key, field in CONFIG_REGISTRY.items():
            schema.register(field)
        _global_config_manager.set_schema(schema)
        _global_config_manager.add_provider(EnvProvider())

        from pathlib import Path

        current_dir = Path(__file__).parent
        config_file = current_dir / "config.yaml"

        if not config_file.exists():
            try:
                from django.conf import settings

                base_dir = getattr(settings, "BASE_DIR", None)
                if base_dir:
                    config_file = Path(base_dir).parent / "apps" / "core" / "config.yaml"
            except ImportError:
                pass

        _global_config_manager.add_provider(YamlProvider(str(config_file)))
        return _global_config_manager


def get_config(key: str, default: Any = None) -> Any:
    """
    获取配置项的便捷函数

    Args:
        key: 配置键（支持点号路径）
        default: 默认值

    Returns:
        Any: 配置值
    """
    return get_config_manager().get(key, default)


# 向后兼容性说明：
# 原有的 business_config, BusinessConfig, CaseTypeCode 已迁移到统一配置管理系统
# 如需使用这些配置，请直接从 apps.core.config 模块导入

__all__ = [
    # 新配置管理系统
    "ConfigManager",
    "ConfigChangeListener",
    "ConfigField",
    "ConfigSchema",
    "CONFIG_REGISTRY",
    "get_config_field",
    "ConfigProvider",
    "EnvProvider",
    "YamlProvider",
    "ConfigException",
    "ConfigNotFoundError",
    "ConfigTypeError",
    "ConfigValidationError",
    "ConfigFileError",
    "SensitiveConfigError",
    # 全局访问函数
    "get_config_manager",
    "get_config",
    # 配置工具函数
    "get_config_value",
    "get_feishu_config",
    "get_document_processing_config",
    "get_case_chat_config",
    "get_court_sms_config",
    "is_config_manager_available",
    "register_config_change_listener",
    "migrate_legacy_config_access",
]