from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, UniqueConstraint, Index
from sqlalchemy.sql import func
from app.database import Base

class SystemConfig(Base):
    __tablename__ = "system_config"
    __table_args__ = (
        UniqueConstraint("tenant_id", "config_key", name="uq_system_config_tenant_key"),
        Index("idx_system_config_tenant_id", "tenant_id"),
        {"schema": "aigcspace"},
    )

    id = Column(Integer, primary_key=True, index=True)
    tenant_id = Column(Integer, ForeignKey("aigcspace.tenants.id"), nullable=True, index=True)
    config_key = Column(String(100), nullable=False, index=True)
    config_value = Column(Text, nullable=False)
    config_type = Column(String(20), nullable=False)
    category = Column(String(50), nullable=False, index=True)
    description = Column(String(500))
    updated_by = Column(Integer, ForeignKey("aigcspace.enterprise_admins.id"), nullable=True)
    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())
    created_at = Column(DateTime, default=func.now())


class ConfigHistory(Base):
    __tablename__ = "config_history"
    __table_args__ = (
        Index("idx_config_history_tenant_id", "tenant_id"),
        {"schema": "aigcspace"},
    )

    id = Column(Integer, primary_key=True, index=True)
    tenant_id = Column(Integer, ForeignKey("aigcspace.tenants.id"), nullable=True, index=True)
    config_key = Column(String(100), nullable=False, index=True)
    old_value = Column(Text)
    new_value = Column(Text, nullable=False)
    updated_by = Column(Integer, ForeignKey("aigcspace.enterprise_admins.id"), nullable=True)
    updated_at = Column(DateTime, default=func.now(), index=True)