from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, func
from sqlalchemy.orm import relationship

from app.core.database import Base


class Instance(Base):
    __tablename__ = "instances"

    id = Column(Integer, primary_key=True, autoincrement=True)
    name = Column(String(100), nullable=False)
    db_type = Column(String(20), nullable=False)  # mysql / postgres / redis / mongo
    host = Column(String(200), nullable=False)
    port = Column(Integer, nullable=False)
    username = Column(String(100), nullable=False)
    password = Column(String(500), nullable=False)  # encrypted
    database = Column(String(100), nullable=True)
    env = Column(String(20), default="development")  # production / staging / development
    description = Column(Text, nullable=True)
    status = Column(String(20), default="disconnected")  # connected / disconnected / error
    version = Column(String(50), nullable=True)

    # 新增字段
    access_mode = Column(String(20), default="readwrite")  # readwrite / read / write
    workflow_id = Column(Integer, ForeignKey("workflow_definitions.id", ondelete="SET NULL"), nullable=True)
    excluded_databases = Column(Text, nullable=True)  # JSON: ["sys", "information_schema", ...]
    mask_fields = Column(Text, nullable=True)  # JSON: [{table, field, rule}]

    # 权限组关联
    group_id = Column(Integer, ForeignKey("instance_groups.id", ondelete="SET NULL"), nullable=True)

    created_at = Column(DateTime, server_default=func.now())
    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())

    # 关系
    group = relationship("InstanceGroup", back_populates="instances")
    workflow_def = relationship("WorkflowDefinition")