"""Bounded retries for payment verification after an inconclusive callback."""

import logging

from celery import shared_task
from django.shortcuts import get_object_or_404

from apps.payments.models import Payment
from apps.payments.services import PaymentVerificationUncertain, request_payment_verification

logger = logging.getLogger(__name__)


@shared_task(bind=True, max_retries=5, name="apps.payments.reconcile_payment")
def reconcile_payment(self, payment_id: int):
    payment = get_object_or_404(
        Payment.objects.select_related("event", "user"),
        pk=payment_id,
    )
    if payment.status in (Payment.OrderStatusChoices.PAID, Payment.OrderStatusChoices.FAILED):
        return payment.get_status_display().lower()
    if not payment.authority:
        logger.error(
            "Payment %s remains pending without a gateway authority; manual review is required",
            payment.id,
        )
        return "pending_manual_review"

    # Imported at task runtime to avoid a view/task import cycle.
    from apps.payments.api.views import (
        _mark_payment_paid,
        _mark_payment_pending,
        _mark_payment_unsuccessful,
        _notify_payment_status,
    )

    try:
        code, data = request_payment_verification(payment)
    except PaymentVerificationUncertain as exc:
        _mark_payment_pending(payment.id)
        if self.request.retries >= self.max_retries:
            logger.error(
                "Payment %s verification remains uncertain after bounded retries; manual review is required",
                payment.id,
                exc_info=exc,
            )
            return "pending_manual_review"
        countdown = min(60 * (2 ** self.request.retries), 15 * 60)
        raise self.retry(exc=exc, countdown=countdown)

    if code in (100, 101):
        payment, newly_verified = _mark_payment_paid(payment.id, data)
        if newly_verified:
            _notify_payment_status(
                payment,
                title=f"پرداخت رویداد «{payment.event.title}» تأیید شد",
                message="پرداخت شما با موفقیت ثبت شد و ثبت‌نام رویداد تکمیل شده است.",
                level="success",
            )
        return "paid"

    payment, result, transitioned = _mark_payment_unsuccessful(
        payment.id,
        Payment.OrderStatusChoices.FAILED,
    )
    if transitioned:
        _notify_payment_status(
            payment,
            title=f"پرداخت رویداد «{payment.event.title}» ناموفق بود",
            message="تراکنش شما توسط درگاه تأیید نشد. در صورت نیاز دوباره پرداخت را انجام دهید.",
            level="error",
        )
    return result