from typing import Optional
from datetime import datetime, timezone

from sqlalchemy import (
    Column, String, Text, Integer, Float, Boolean,
    DateTime, ForeignKey, JSON, func,
)
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship


class Base(DeclarativeBase):
    pass


class User(Base):
    __tablename__ = "users"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    openid: Mapped[str] = mapped_column(String(128), unique=True, nullable=False, index=True)
    nickname: Mapped[Optional[str]] = mapped_column(String(128))
    avatar_url: Mapped[Optional[str]] = mapped_column(String(512))
    role: Mapped[str] = mapped_column(String(32), default="user")  # user / admin / pharmacist
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )