"""系统设置模型 — 键值对存储，支持分组。"""

from datetime import datetime, timezone
from sqlalchemy import Column, Integer, String, Text, DateTime, Boolean
from app.core.database import Base


class SystemSetting(Base):
    """系统设置表 — key-value 存储。

    每个设置项包含: key, value, value_type, group, description, default_value。
    value_type 用于前端控件渲染 (boolean → 开关, integer → 数字输入, string → 文本)。
    """
    __tablename__ = "system_settings"

    id = Column(Integer, primary_key=True, autoincrement=True)
    key = Column(String(100), unique=True, nullable=False, index=True, comment="设置键名")
    value = Column(Text, nullable=False, comment="设置值（字符串存储）")
    value_type = Column(String(20), nullable=False, default="string", comment="值类型: boolean/integer/string")
    group = Column(String(50), nullable=False, default="general", comment="分组: query/security/general")
    label = Column(String(100), nullable=False, comment="显示名称")
    description = Column(Text, nullable=True, comment="说明")
    default_value = Column(Text, nullable=True, comment="默认值")
    sort_order = Column(Integer, nullable=False, default=0, comment="排序权重")
    updated_at = Column(DateTime, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))

    def get_typed_value(self):
        """将字符串值转为实际类型。"""
        if self.value_type == "boolean":
            return self.value.lower() in ("true", "1", "yes")
        if self.value_type == "integer":
            try:
                return int(self.value)
            except (ValueError, TypeError):
                return int(self.default_value or 0)
        return self.value