from pydantic import BaseModel, Field, EmailStr
from typing import Optional
from datetime import datetime
from uuid import UUID

class UserBase(BaseModel):
    username: str = Field(..., min_length=3, max_length=50)
    email: EmailStr = Field(..., description="User's email address")
    first_name: Optional[str] = Field(None, max_length=50)
    last_name: Optional[str] = Field(None, max_length=50)

class UserCreate(UserBase):
    password: str = Field(..., min_length=8, max_length=100)

    class Config:
        schema_extra = {
            "example": {
                "username": "johndoe",
                "email": "john@example.com",
                "first_name": "John",
                "last_name": "Doe",
                "password": "securepass123"
            }
        }

class User(UserBase):
    id: UUID
    is_active: bool = Field(default=True)
    created_at: datetime
    updated_at: datetime

    class Config:
        orm_mode = True
        schema_extra = {
            "example": {
                "id": "550e8400-e29b-41d4-a716-446655440000",
                "username": "johndoe",
                "email": "john@example.com",
                "first_name": "John",
                "last_name": "Doe",
                "is_active": True,
                "created_at": "2023-01-01T00:00:00",
                "updated_at": "2023-01-01T00:00:00"
            }
        }