from datetime import datetime, timezone
from sqlalchemy import String, Boolean, DateTime
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database import Base


def utcnow() -> datetime:
    return datetime.now(timezone.utc)


class User(Base):
    __tablename__ = "users"

    id: Mapped[int] = mapped_column(primary_key=True)
    email: Mapped[str] = mapped_column(String(255), unique=True, nullable=False, index=True)
    username: Mapped[str] = mapped_column(String(100), nullable=False)
    password_hash: Mapped[str] = mapped_column(String(255), nullable=False)
    role: Mapped[str] = mapped_column(String(20), default="participant")  # admin | participant
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow)

    # Profile fields
    full_name: Mapped[str | None] = mapped_column(String(255), nullable=True)
    telegram: Mapped[str | None] = mapped_column(String(100), nullable=True)
    vk: Mapped[str | None] = mapped_column(String(100), nullable=True)
    study_group: Mapped[str | None] = mapped_column(String(50), nullable=True)
    avatar_url: Mapped[str | None] = mapped_column(String(500), nullable=True)

    # Relationships
    submissions = relationship("Submission", back_populates="user", cascade="all, delete-orphan", passive_deletes=True)
    created_contests = relationship("Contest", back_populates="creator")
    participations = relationship("ContestParticipant", back_populates="user", cascade="all, delete-orphan", passive_deletes=True)