from sqlalchemy import Boolean, Column, DateTime, ForeignKey, String, Text, text
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import relationship
from sqlalchemy.sql import func
from backend.app.db.base import Base


class Role(Base):
    __tablename__ = "roles"

    id = Column(UUID(as_uuid=True), primary_key=True, server_default=text("gen_random_uuid()"))
    name = Column(String, unique=True, nullable=False)
    external_role_id = Column(String, unique=True)
    description = Column(Text)
    is_system = Column(Boolean, nullable=False, server_default="true")
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False)

    permissions = relationship("RolePermission", back_populates="role", cascade="all, delete-orphan")


class Permission(Base):
    __tablename__ = "permissions"

    code = Column(String, primary_key=True)
    name = Column(String, nullable=False)
    module = Column(String, nullable=False)
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)

    roles = relationship("RolePermission", back_populates="permission", cascade="all, delete-orphan")


class RolePermission(Base):
    __tablename__ = "role_permissions"

    role_id = Column(UUID(as_uuid=True), ForeignKey("roles.id", ondelete="CASCADE"), primary_key=True)
    permission_code = Column(String, ForeignKey("permissions.code", ondelete="CASCADE"), primary_key=True)

    role = relationship("Role", back_populates="permissions")
    permission = relationship("Permission", back_populates="roles")