from pydantic import BaseModel, EmailStr, field_validator
from typing import Optional
from datetime import datetime


class UserBase(BaseModel):
    email: EmailStr
    username: str
    full_name: Optional[str] = None
    is_active: bool = True


class UserCreate(UserBase):
    password: str

    @field_validator("password")
    def password_must_be_strong(cls, v):
        if len(v) < 8:
            raise ValueError("Password must be at least 8 characters long")
        return v


class UserUpdate(BaseModel):
    email: Optional[EmailStr] = None
    full_name: Optional[str] = None
    password: Optional[str] = None

    @field_validator("password")
    def password_must_be_strong(cls, v):
        if v is not None and len(v) < 8:
            raise ValueError("Password must be at least 8 characters long")
        return v


class UserInDB(UserBase):
    id: int
    hashed_password: str
    is_admin: bool = False
    created_at: datetime
    updated_at: datetime

    class Config:
        from_attributes = True


class User(UserBase):
    id: int
    is_admin: bool = False
    created_at: datetime
    updated_at: datetime

    class Config:
        from_attributes = True


class Token(BaseModel):
    access_token: str
    token_type: str


class TokenData(BaseModel):
    username: Optional[str] = None