import uuid
from datetime import datetime

from sqlalchemy import Boolean, 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 StudyMember(Base):
    __tablename__ = "study_members"
    __table_args__ = (UniqueConstraint("study_id", "user_id", name="uq_study_member"),)

    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"), nullable=False, index=True)
    user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=False)
    role_in_study: Mapped[str] = mapped_column(String(20), nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, server_default="true")
    added_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())