import uuid
from datetime import datetime

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

from app.db.base_class import Base


class SubjectPd(Base):
    __tablename__ = "subject_pds"
    __table_args__ = (UniqueConstraint("study_id", "pd_no", name="uq_subject_pds_study_pd_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)
    subject_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("subjects.id"), index=True, nullable=False)
    pd_no: Mapped[str] = mapped_column(String(64), nullable=False)
    pd_type: Mapped[str] = mapped_column(String(100), nullable=False)
    pd_level: Mapped[str] = mapped_column(String(20), nullable=False, server_default="GENERAL")
    approval_status: Mapped[str] = mapped_column(String(20), nullable=False, server_default="DRAFT")
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    status: Mapped[str] = mapped_column(String(20), nullable=False, server_default="OPEN")
    created_by: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
    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()
    )