import uuid
from datetime import datetime, date

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

from app.db.base_class import Base


class ImpTransaction(Base):
    __tablename__ = "imp_transactions"

    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)
    site_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("sites.id"), index=True, nullable=False)
    batch_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("imp_batches.id"), index=True, nullable=False)
    subject_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("subjects.id"), nullable=True)
    tx_type: Mapped[str] = mapped_column(String(20), nullable=False)
    quantity: Mapped[int] = mapped_column(Integer, nullable=False)
    tx_date: Mapped[date] = mapped_column(Date, nullable=False)
    reference: Mapped[str | None] = mapped_column(String(255), nullable=True)
    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_by: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())