OPEN-ISP v0.5 (pickle-lime) — rilis open-source perdana

Aplikasi billing & manajemen ISP (fiber optic) — PWA pelanggan, portal teknisi & kolektor,
admin panel lengkap, multi-vendor OLT, RADIUS, WhatsApp/Telegram, pembayaran QRIS.

Kredit & lisensi (ISC):
- Base kode & repo: alijayanet/billing-rtrw oleh Alijaya Net — terima kasih banyak
  atas base kode dan repo yang bermanfaat.
- Add-on: GoWA, LibreSpeed/OpenSpeedTest, Uptime Kuma, notification-forwarder.
- Dikembangkan menjadi OPEN-ISP oleh oxpoe — https://github.com/oxpoe/open-isp

services/registrationService.js

@@ -0,0 +1,72 @@
+'use strict';
+/**
+ * registrationService.js — Perhitungan biaya awal pendaftaran (prorata, acuan tgl 5).
+ * biaya pasang + prorata paket − diskon voucher = total bayar awal.
+ *
+ * Aturan acuan tgl 5:
+ *  - daftar SEBELUM tgl 5  → paket dihitung dari tgl daftar sampai tgl 5 BULAN INI
+ *  - daftar tgl 5 atau SESUDAH → dihitung sampai tgl 5 BULAN DEPAN
+ */
+const { getSetting } = require('../config/settingsManager');
+const voucherService = require('./voucherService');
+
+function localParts(date) {
+  const tz = getSetting('timezone', 'Asia/Jakarta');
+  try {
+    const fmt = new Intl.DateTimeFormat('en-CA', { timeZone: tz, year: 'numeric', month: '2-digit', day: '2-digit' });
+    const o = {};
+    fmt.formatToParts(date).forEach(p => { o[p.type] = p.value; });
+    return { y: Number(o.year), m: Number(o.month), d: Number(o.day) };
+  } catch (e) {
+    return { y: date.getFullYear(), m: date.getMonth() + 1, d: date.getDate() };
+  }
+}
+function pad(n) { return String(n).padStart(2, '0'); }
+
+function computeBill(pkgPrice, opts = {}) {
+  const now = opts.now ? new Date(opts.now) : new Date();
+  const { y, m, d } = localParts(now);
+  const price = Math.max(0, Math.round(Number(pkgPrice) || 0));
+  const installFee = Math.max(0, Math.round(Number(opts.installFee != null ? opts.installFee : getSetting('registration_install_fee', 0)) || 0));
+
+  let dueY = y, dueM = m;
+  if (d >= 5) {
+    if (m === 12) { dueY = y + 1; dueM = 1; } else { dueM = m + 1; }
+  }
+  const start = new Date(y, m - 1, d);
+  const due = new Date(dueY, dueM - 1, 5);
+  const diffDays = Math.max(1, Math.round((due.getTime() - start.getTime()) / 86400000));
+  const daysInMonth = new Date(dueY, dueM, 0).getDate();
+  const costPerDay = price / daysInMonth;
+  const prorata = Math.round(diffDays * costPerDay);
+  const gross = prorata + installFee;
+
+  let discount = 0;
+  let voucher = null;
+  if (opts.voucherCode) {
+    const v = voucherService.getByCode(opts.voucherCode);
+    if (v) {
+      const chk = voucherService.validate(opts.voucherCode, gross);
+      if (chk.ok) { discount = chk.discount; voucher = v; }
+    }
+  }
+  const total = Math.max(0, gross - discount);
+
+  return {
+    price,
+    installFee,
+    startDate: `${y}-${pad(m)}-${pad(d)}`,
+    dueDate: `${dueY}-${pad(dueM)}-05`,
+    diffDays,
+    daysInMonth,
+    costPerDay: Math.round(costPerDay),
+    prorata,
+    gross,
+    discount,
+    total,
+    voucherCode: voucher ? voucher.code : '',
+    voucherValid: !!voucher
+  };
+}
+
+module.exports = { computeBill, localParts };