import uuid
from datetime import datetime
from sqlalchemy import String, Boolean, DateTime, Text, ForeignKey
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.dialects.postgresql import UUID, JSONB
from app.database import Base
from typing import TYPE_CHECKING
if TYPE_CHECKING:
    from app.domains.tenants.models import Tenant


class Template(Base):
    __tablename__ = "templates"

    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)
    category_key: Mapped[str] = mapped_column(String(100), unique=True, nullable=False, index=True)
    # JSONB config for each of the 11 standard columns: {col_index: {label, required, optional}}
    standard_fields: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict)
    # JSONB schema for expected component pairs
    component_schema: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict)
    description: Mapped[str] = mapped_column(Text, nullable=True)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    tenant_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("tenants.id"), nullable=True, index=True
    )
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)

    orders: Mapped[list["Order"]] = relationship("Order", back_populates="template")