"""
User model for authentication.
Represents a registered user account with hashed password.
"""

from sqlmodel import SQLModel, Field
from datetime import datetime
from uuid import UUID, uuid4
from typing import Optional


class User(SQLModel, table=True):
    """User account model."""

    __tablename__ = "users"

    id: UUID = Field(default_factory=uuid4, primary_key=True)
    username: str = Field(max_length=50, unique=True, index=True)
    hashed_password: str = Field(max_length=255)
    created_at: datetime = Field(default_factory=datetime.utcnow)
    updated_at: datetime = Field(default_factory=datetime.utcnow)

    class Config:
        json_schema_extra = {
            "example": {
                "id": "550e8400-e29b-41d4-a716-446655440000",
                "username": "johndoe",
                "created_at": "2026-02-05T12:00:00",
                "updated_at": "2026-02-05T12:00:00"
            }
        }