"""Активация кода пополнения."""

from __future__ import annotations

from dataclasses import dataclass

from services.db import Database
from services.topup_codes import is_valid_code_format, normalize_code


class TopupCodeError(ValueError):
    pass


@dataclass(frozen=True, slots=True)
class TopupCodeRedeemResult:
    ok: bool
    message: str
    amount: float = 0.0
    balance: float = 0.0
    already: bool = False


def redeem_topup_code(
    db: Database,
    *,
    telegram_id: int,
    raw_code: str,
) -> TopupCodeRedeemResult:
    code = normalize_code(raw_code)
    if not is_valid_code_format(code):
        raise TopupCodeError("Некорректный формат кода (ожидается XXXX-XXXX-XXXX-XXXX)")

    db.ensure_user(telegram_id)
    try:
        amount, already = db.redeem_topup_code(code=code, telegram_id=telegram_id)
    except ValueError as exc:
        raise TopupCodeError(str(exc)) from exc
    if already:
        balance = db.get_balance(telegram_id)
        return TopupCodeRedeemResult(
            ok=True,
            already=True,
            message="Этот код уже был использован.",
            amount=amount,
            balance=balance,
        )

    balance = db.add_balance(
        telegram_id,
        amount,
        kind="code_topup",
        meta=f"code:{code}",
    )
    text = (
        f"✅ <b>Баланс пополнен по коду</b>\n\n"
        f"+{amount:.0f} ₽\n"
        f"Доступно: <b>{balance:.0f} ₽</b>"
    )
    return TopupCodeRedeemResult(
        ok=True,
        message=text,
        amount=amount,
        balance=balance,
    )