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/discountService.js

@@ -0,0 +1,162 @@
+'use strict';
+/**
+ * Service: Diskon tagihan (batch & individual) + riwayat.
+ * - Diskon persen dihitung dari HARGA DASAR (sebelum PPN/USO).
+ * - amount tetap nominal akhir (net) agar alur QRIS/cash/laporan ikut otomatis.
+ * - Saat nominal berubah, kode unik QRIS direset agar digenerate ulang.
+ */
+const db = require('../config/database');
+const auditTrail = require('./auditTrailService');
+
+// Ambil total PPN + USO dari catatan AUTO invoice
+function parseTaxFromNotes(notes) {
+  const s = String(notes || '');
+  let tax = 0;
+  const grab = (re) => {
+    const m = re.exec(s);
+    if (m) return Number(String(m[1]).replace(/\./g, '')) || 0;
+    return 0;
+  };
+  tax += grab(/PPN\s+[\d.,]+%\s*\(Rp\s*([\d.]+)\)/i);
+  tax += grab(/USO\s+[\d.,]+%\s*\(Rp\s*([\d.]+)\)/i);
+  return tax;
+}
+
+// Harga dasar = nominal awal (sebelum diskon) dikurangi PPN+USO
+function getBaseAmount(inv) {
+  const original = Number(inv.amount_before_discount || 0) > 0
+    ? Number(inv.amount_before_discount)
+    : Number(inv.amount || 0);
+  const tax = parseTaxFromNotes(inv.notes);
+  return Math.max(0, original - tax);
+}
+
+function applyDiscountToInvoice(invoiceId, opts = {}, actor = null) {
+  const invId = Number(invoiceId);
+  if (!invId) throw new Error('ID tagihan tidak valid');
+
+  const inv = db.prepare('SELECT * FROM invoices WHERE id=?').get(invId);
+  if (!inv) throw new Error('Tagihan tidak ditemukan');
+  if (inv.status === 'paid') throw new Error('Tagihan sudah lunas, tidak bisa didiskon');
+  if (inv.status === 'void') throw new Error('Tagihan sudah dihanguskan');
+
+  const type = opts.type === 'percent' ? 'percent' : 'amount';
+  const value = Math.round(Number(opts.value) || 0);
+  if (value <= 0) throw new Error('Nilai diskon harus lebih dari 0');
+  if (type === 'percent' && value > 100) throw new Error('Diskon persen maksimal 100%');
+
+  const original = Number(inv.amount_before_discount || 0) > 0
+    ? Number(inv.amount_before_discount)
+    : Number(inv.amount || 0);
+  const base = getBaseAmount(inv);
+
+  let discountAmount = type === 'percent'
+    ? Math.round(base * (value / 100))
+    : value;
+  discountAmount = Math.max(0, Math.min(discountAmount, original));
+  const newAmount = Math.max(0, original - discountAmount);
+
+  const res = db.prepare(`
+    UPDATE invoices SET
+      amount = ?,
+      amount_before_discount = ?,
+      discount_type = ?,
+      discount_value = ?,
+      discount_amount = ?,
+      qris_unique_code = NULL, qris_amount_unique = NULL, qris_assigned_at = NULL
+    WHERE id = ? AND status = 'unpaid'
+  `).run(newAmount, original, type, value, discountAmount, invId);
+
+  if (!res.changes) throw new Error('Gagal menerapkan diskon (status tagihan berubah)');
+
+  const actorName = (actor && (actor.name || actor.username)) || 'Admin';
+  try {
+    db.prepare(`
+      INSERT INTO discount_logs
+        (invoice_id, customer_id, period_month, period_year, discount_type, discount_value,
+         discount_amount, amount_before, amount_after, applied_by, note)
+      VALUES (?,?,?,?,?,?,?,?,?,?,?)
+    `).run(invId, inv.customer_id, inv.period_month, inv.period_year, type, value,
+      discountAmount, original, newAmount, actorName, String(opts.note || ''));
+  } catch (e) { /* log opsional */ }
+
+  if (actor) {
+    try {
+      auditTrail.logAuditTrail({
+        action: 'APPLY_INVOICE_DISCOUNT',
+        entity_type: 'invoice',
+        entity_id: String(invId),
+        actor_type: actor.type || 'admin',
+        actor_id: actor.id || null,
+        actor_name: actorName,
+        details: {
+          customer_id: inv.customer_id,
+          period: `${inv.period_month}/${inv.period_year}`,
+          type, value, discount_amount: discountAmount,
+          amount_before: original, amount_after: newAmount
+        },
+        ip_address: actor.ip || null,
+        user_agent: actor.userAgent || null
+      });
+    } catch (e) {}
+  }
+
+  return { invoiceId: invId, customerId: inv.customer_id, periodMonth: inv.period_month, periodYear: inv.period_year, type, value, discountAmount, amountBefore: original, amountAfter: newAmount };
+}
+
+/**
+ * Terapkan diskon ke banyak pelanggan untuk periode tertentu.
+ * opts: { customerIds, all, periodMonth, periodYear, type, value, note, actor }
+ */
+function applyDiscountBatch(opts = {}) {
+  const pMonth = Number(opts.periodMonth) || 0;
+  const pYear = Number(opts.periodYear) || 0;
+  if (!pMonth || pMonth < 1 || pMonth > 12) throw new Error('Bulan periode tidak valid');
+  if (!pYear) throw new Error('Tahun periode tidak valid');
+
+  let ids = Array.isArray(opts.customerIds) ? opts.customerIds.map(Number).filter(n => n > 0) : [];
+  if (opts.all) {
+    ids = db.prepare("SELECT id FROM customers WHERE status IN ('active','ditangguhkan') AND package_id IS NOT NULL").all().map(r => r.id);
+  }
+  ids = [...new Set(ids)];
+  if (!ids.length) throw new Error('Tidak ada pelanggan yang dipilih');
+
+  const findInv = db.prepare("SELECT id FROM invoices WHERE customer_id=? AND period_month=? AND period_year=? AND status='unpaid' LIMIT 1");
+  const summary = { applied: [], skipped: [], totalDiscount: 0, totalCustomers: ids.length };
+
+  for (const cid of ids) {
+    const row = findInv.get(cid, pMonth, pYear);
+    if (!row) { summary.skipped.push(cid); continue; }
+    try {
+      const r = applyDiscountToInvoice(row.id, { type: opts.type, value: opts.value, note: opts.note }, opts.actor);
+      summary.applied.push(r);
+      summary.totalDiscount += r.discountAmount;
+    } catch (e) {
+      summary.skipped.push(cid);
+    }
+  }
+  return summary;
+}
+
+function getDiscountLogs(limit = 100) {
+  return db.prepare(`
+    SELECT dl.*, c.name as customer_name, c.customer_code, c.phone as customer_phone
+    FROM discount_logs dl
+    LEFT JOIN customers c ON c.id = dl.customer_id
+    ORDER BY dl.id DESC
+    LIMIT ?
+  `).all(Math.max(1, Math.min(500, parseInt(limit, 10) || 100)));
+}
+
+function getInvoiceDiscount(invoiceId) {
+  return db.prepare('SELECT amount, amount_before_discount, discount_type, discount_value, discount_amount FROM invoices WHERE id=?').get(Number(invoiceId));
+}
+
+module.exports = {
+  parseTaxFromNotes,
+  getBaseAmount,
+  applyDiscountToInvoice,
+  applyDiscountBatch,
+  getDiscountLogs,
+  getInvoiceDiscount
+};