import { prisma } from "@/lib/prisma";

const HOUR_MS = 60 * 60 * 1000;
const DAY_MS = 24 * HOUR_MS;

export interface StaleSummary {
  /** Payment MIDTRANS status AWAITING > 25 jam (lewat expiresAt) — webhook gagal? */
  stalePaymentsCount: number;
  /** Booking AWAITING_PAY tapi trip sudah lewat hari ini — peserta lupa bayar. */
  awaitingPayPastDepartureCount: number;
  /** Payout HELD tapi heldUntil sudah lebih 1 hari lewat — cron release tidak jalan? */
  overduePayoutsCount: number;
  /** Refund APPROVED > 7 hari belum di-process — admin lupa? */
  stuckRefundsCount: number;
}

/**
 * Deteksi entity yang nyangkut di state non-final terlalu lama. Dipanggil dari
 * `/admin/system` page on-demand (bukan cron) supaya selalu show realtime.
 *
 * Threshold draft — review setelah jalan 1-2 minggu (false positive vs miss).
 */
export const systemHealthService = {
  async detectStale(): Promise<StaleSummary> {
    const now = new Date();
    const twentyFiveHoursAgo = new Date(now.getTime() - 25 * HOUR_MS);
    const oneDayAgo = new Date(now.getTime() - DAY_MS);
    const sevenDaysAgo = new Date(now.getTime() - 7 * DAY_MS);
    const todayStart = new Date(now);
    todayStart.setUTCHours(0, 0, 0, 0);

    const [
      stalePayments,
      awaitingPayPast,
      overduePayouts,
      stuckRefunds,
    ] = await Promise.all([
      prisma.payment.count({
        where: {
          provider: "MIDTRANS",
          status: "AWAITING",
          createdAt: { lte: twentyFiveHoursAgo },
        },
      }),
      prisma.booking.count({
        where: {
          status: "AWAITING_PAY",
          trip: { date: { lt: todayStart } },
        },
      }),
      prisma.payout.count({
        where: {
          status: "HELD",
          heldUntil: { lte: oneDayAgo },
        },
      }),
      prisma.refund.count({
        where: {
          status: "APPROVED",
          reviewedAt: { lte: sevenDaysAgo },
        },
      }),
    ]);

    return {
      stalePaymentsCount: stalePayments,
      awaitingPayPastDepartureCount: awaitingPayPast,
      overduePayoutsCount: overduePayouts,
      stuckRefundsCount: stuckRefunds,
    };
  },
};