from sqlalchemy import Column, String, Boolean, DateTime, ForeignKey, UniqueConstraint
from sqlalchemy.sql import func
from app.core.database.db_session import Base

class Permission(Base):
    __tablename__ = "permissions"

    permission_id = Column(String(26), primary_key=True)
    module = Column(String(50), nullable=False)
    resource = Column(String(50), nullable=False)
    action = Column(String(50), nullable=False)
    permission_code = Column(String(150), unique=True, nullable=False)  # module.resource.action
    description = Column(String(255), nullable=True)
    is_active = Column(Boolean, default=True)
    created_at = Column(DateTime, server_default=func.now())

class RolePermission(Base):
    __tablename__ = "role_permissions"

    id = Column(String(26), primary_key=True)
    role_id = Column(String(26), ForeignKey("roles.role_id", ondelete="CASCADE"), nullable=False)
    permission_id = Column(String(26), ForeignKey("permissions.permission_id", ondelete="CASCADE"), nullable=False)
    created_at = Column(DateTime, server_default=func.now())

    __table_args__ = (
        UniqueConstraint("role_id", "permission_id", name="uq_role_permission"),
    )