from pydantic import BaseModel, Field
from typing import Optional
from datetime import datetime


class UserBase(BaseModel):
    username: str = Field(..., min_length=3, max_length=50)
    display_name: Optional[str] = None
    email: Optional[str] = None
    role: str = Field(default="user", pattern="^(admin|user|readonly)$")
    notification_level: str = Field(default="normal", pattern="^(none|low|normal|high)$")


class UserCreate(UserBase):
    password: str = Field(..., min_length=6)


class UserUpdate(BaseModel):
    display_name: Optional[str] = None
    email: Optional[str] = None
    role: Optional[str] = None
    notification_level: Optional[str] = None
    is_active: Optional[bool] = None


class UserResponse(UserBase):
    id: int
    is_active: bool
    created_at: datetime
    updated_at: datetime

    class Config:
        from_attributes = True


class UserLogin(BaseModel):
    username: str
    password: str


class Token(BaseModel):
    access_token: str
    token_type: str = "bearer"
    user: UserResponse