import uuid
from datetime import datetime

from typing import Literal

from pydantic import BaseModel, EmailStr, Field


class AdminUserResponse(BaseModel):
    id: uuid.UUID
    email: str
    username: str
    full_name: str | None
    role: str
    is_active: bool
    max_chats: int
    created_at: datetime

    model_config = {"from_attributes": True}


class AdminUserCreateRequest(BaseModel):
    email: EmailStr
    username: str = Field(min_length=3, max_length=50, pattern=r"^[a-zA-Z0-9_-]+$")
    password: str = Field(min_length=8, max_length=128)
    full_name: str | None = None
    role: Literal["user", "admin"] = "user"
    max_chats: int = 10


class AdminUserUpdateRequest(BaseModel):
    role: Literal["user", "admin"] | None = None
    is_active: bool | None = None
    max_chats: int | None = None
    full_name: str | None = None


class AdminUserListResponse(BaseModel):
    users: list[AdminUserResponse]
    total: int