from datetime import datetime
from uuid import uuid4

from sqlalchemy import DateTime, ForeignKey, String, UniqueConstraint, func
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column

from app.db.base import Base


class Permission(Base):
    __tablename__ = "permissions"
    __table_args__ = (
        UniqueConstraint(
            "user_id",
            "scope_type",
            "scope_id",
            "module",
            "action",
            name="uq_permissions_user_scope_module_action",
        ),
    )

    id: Mapped[str] = mapped_column(UUID(as_uuid=False), primary_key=True, default=lambda: str(uuid4()))
    user_id: Mapped[str] = mapped_column(UUID(as_uuid=False), ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    scope_type: Mapped[str] = mapped_column(String(32), nullable=False)
    scope_id: Mapped[str] = mapped_column(String(128), nullable=False)
    module: Mapped[str] = mapped_column(String(128), nullable=False)
    action: Mapped[str] = mapped_column(String(32), nullable=False)

    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), nullable=False)