import uuid
from datetime import datetime, date

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

from app.db.base_class import Base


class ImpBatch(Base):
    __tablename__ = "imp_batches"
    __table_args__ = (UniqueConstraint("study_id", "batch_no", "product_id", name="uq_imp_batch_no"),)

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    study_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("studies.id"), index=True, nullable=False)
    product_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("imp_products.id"), index=True, nullable=False)
    batch_no: Mapped[str] = mapped_column(String(100), nullable=False)
    expiry_date: Mapped[date | None] = mapped_column(Date, nullable=True)
    manufacture_date: Mapped[date | None] = mapped_column(Date, nullable=True)
    status: Mapped[str] = mapped_column(String(20), nullable=False, default="ACTIVE")
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
    )