import uuid
from datetime import datetime
from sqlalchemy import String, DateTime, Text, ForeignKey, Integer
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.dialects.postgresql import UUID
from app.database import Base


class Material(Base):
    __tablename__ = "materials"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str] = mapped_column(String(200), nullable=False, unique=True)
    description: Mapped[str] = mapped_column(Text, nullable=True)
    source: Mapped[str] = mapped_column(String(20), nullable=False, default="manual")
    schaeffler_code: Mapped[int | None] = mapped_column(Integer, nullable=True)
    created_by: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=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)

    creator: Mapped["User"] = relationship("User", foreign_keys=[created_by], lazy="select")  # type: ignore[name-defined]
    aliases = relationship("MaterialAlias", back_populates="material", cascade="all, delete-orphan")