"""
配置服务
优先从数据库 system_configs 表读取配置，数据库无值时回退到 .env
"""
import logging
from typing import Optional
from sqlalchemy.orm import Session

from ..database import SessionLocal
from ..models.system_config import SystemConfig
from ..config import settings as env_settings

logger = logging.getLogger(__name__)


def get_config_value(key: str, default: Optional[str] = None) -> Optional[str]:
    """
    获取配置值（数据库优先，.env 兜底）
    
    Args:
        key: 配置键名（如 SILICONFLOW_API_KEY）
        default: 默认值
    Returns:
        配置值字符串
    """
    # 1. 尝试从数据库读取
    try:
        db = SessionLocal()
        try:
            config = db.query(SystemConfig).filter(SystemConfig.config_key == key).first()
            if config and config.config_value:
                return config.config_value
        finally:
            db.close()
    except Exception as e:
        logger.warning(f"从数据库读取配置 {key} 失败: {e}")
    
    # 2. 回退到 .env / Settings
    env_value = getattr(env_settings, key, None)
    if env_value is not None and env_value != "":
        return str(env_value)
    
    return default


def get_ai_config() -> dict:
    """
    获取所有 AI 相关配置
    返回字典，方便 ai_generator 使用
    """
    return {
        "SILICONFLOW_API_KEY": get_config_value("SILICONFLOW_API_KEY", ""),
        "SILICONFLOW_BASE_URL": get_config_value("SILICONFLOW_BASE_URL", "https://api.siliconflow.cn/v1"),
        "VOLCENGINE_API_KEY": get_config_value("VOLCENGINE_API_KEY", ""),
        "VOLCENGINE_BASE_URL": get_config_value("VOLCENGINE_BASE_URL", "https://ark.cn-beijing.volces.com/api/v3"),
        "AI_IMAGE_MODEL": get_config_value("AI_IMAGE_MODEL", "flux-dev"),
        "AI_IMAGE_SIZE": int(get_config_value("AI_IMAGE_SIZE", "1024")),
    }