"""Platform step model — platform-owned steps, readable by all users.

No account_id. No RLS. Readable by any authenticated user.
Populated by promoting visibility='public' steps from step_library.
"""
import uuid
from datetime import datetime, timezone
from typing import Optional, Any

from sqlalchemy import String, Boolean, DateTime, ForeignKey
from sqlalchemy.orm import Mapped, mapped_column
from sqlalchemy.dialects.postgresql import UUID, JSONB

from app.core.database import Base


class PlatformStep(Base):
    __tablename__ = "platform_steps"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    title: Mapped[str] = mapped_column(String(255), nullable=False)
    step_type: Mapped[str] = mapped_column(String(50), nullable=False, index=True)
    content: Mapped[dict[str, Any]] = mapped_column(JSONB, nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    source_step_id: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("step_library.id", ondelete="SET NULL"),
        nullable=True,
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(timezone.utc),
        onupdate=lambda: datetime.now(timezone.utc),
    )