"""Template tree model — platform-owned troubleshooting trees, readable by all users.

No account_id. No RLS. Readable by any authenticated user.
Populated by promoting is_default=TRUE trees from the trees table.
"""
import uuid
from datetime import datetime, timezone
from typing import Optional, Any

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

from app.core.database import Base


class TemplateTree(Base):
    __tablename__ = "template_trees"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    category: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
    tree_type: Mapped[str] = mapped_column(String(20), nullable=False, index=True)
    tree_structure: Mapped[dict[str, Any]] = mapped_column(JSONB, nullable=False)
    tags: Mapped[list] = mapped_column(JSONB, nullable=False, default=list)
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
    source_tree_id: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("trees.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),
    )