import uuid
from datetime import datetime

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

from app.db.base_class import Base


class Study(Base):
    __tablename__ = "studies"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    code: Mapped[str] = mapped_column(String(50), unique=True, nullable=False, index=True)
    name: Mapped[str] = mapped_column(String(200), nullable=False)
    sponsor: Mapped[str | None] = mapped_column(String(200), nullable=True)
    protocol_no: Mapped[str | None] = mapped_column(String(100), nullable=True)
    phase: Mapped[str | None] = mapped_column(String(50), nullable=True)
    status: Mapped[str] = mapped_column(String(20), nullable=False, default="DRAFT")
    visit_interval_days: Mapped[int | None] = mapped_column(Integer, nullable=True)
    visit_total: Mapped[int | None] = mapped_column(Integer, nullable=True)
    visit_window_start_offset: Mapped[int | None] = mapped_column(Integer, nullable=True)
    visit_window_end_offset: Mapped[int | None] = mapped_column(Integer, nullable=True)
    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())