from typing import Any

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field
from sqlalchemy import select
from sqlalchemy.orm import Session

from app.auth.deps import get_current_user
from app.auth.service import create_user, find_user_by_token, user_to_dict
from app.db.base import get_db
from app.db.models import User

router = APIRouter(prefix="/auth", tags=["auth"])


class LoginRequest(BaseModel):
    token: str = Field(min_length=8, max_length=256)


class CreateUserRequest(BaseModel):
    username: str = Field(min_length=2, max_length=64)
    display_name: str = ""
    token: str | None = Field(default=None, min_length=8, max_length=256)


@router.post("/login")
def login(payload: LoginRequest, db: Session = Depends(get_db)) -> dict[str, Any]:
    user = find_user_by_token(db, payload.token)
    if not user:
        raise HTTPException(status_code=401, detail="Неверный токен")
    return {"ok": True, "user": user_to_dict(user), "token": payload.token.strip()}


@router.get("/me")
def me(user: User = Depends(get_current_user)) -> dict[str, Any]:
    return {"ok": True, "user": user_to_dict(user)}


@router.get("/users")
def list_users(
    db: Session = Depends(get_db),
    user: User = Depends(get_current_user),
) -> dict[str, Any]:
    rows = db.scalars(select(User).where(User.is_active.is_(True)).order_by(User.id)).all()
    return {
        "ok": True,
        "users": [user_to_dict(row) for row in rows],
        "current_user_id": user.id,
    }


@router.post("/users")
def register_user(
    payload: CreateUserRequest,
    db: Session = Depends(get_db),
    user: User = Depends(get_current_user),
) -> dict[str, Any]:
    try:
        new_user, plain_token = create_user(
            db,
            username=payload.username,
            display_name=payload.display_name,
            api_token=payload.token,
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc

    return {
        "ok": True,
        "user": user_to_dict(new_user),
        "token": plain_token,
        "created_by": user.username,
    }