from datetime import datetime, timezone
from typing import Optional

from sqlalchemy import JSON, Boolean, DateTime, Enum, Integer, String
from sqlalchemy.orm import Mapped, mapped_column

from app.db.session import Base
from app.models.enums import Role


def _utcnow() -> datetime:
    return datetime.now(timezone.utc).replace(tzinfo=None)


class User(Base):
    __tablename__ = "users"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    username: Mapped[str] = mapped_column(String(64), unique=True, index=True, nullable=False)
    full_name: Mapped[str] = mapped_column(String(120), nullable=False)
    email: Mapped[Optional[str]] = mapped_column(String(255), unique=True)
    hashed_password: Mapped[str] = mapped_column(String(255), nullable=False)
    role: Mapped[Role] = mapped_column(Enum(Role), default=Role.viewer, nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    functionality_access: Mapped[Optional[list[str]]] = mapped_column(JSON, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=_utcnow, nullable=False)