feat(investment): interest in transaction log, accrued interest since last coupon, investment-only GL list

src/app/investment/bond-investment/bond-investment.component.html

@@ -853,7 +853,7 @@
               <tr [style.opacity]="r.due ? 1 : 0.6">
                 <td>
                   <span class="pg-chip">{{ r.type === 'COUPON' ? 'Coupon' : 'Provision' }}</span>
-                  @if (r.due) {
+                  @if (r.due && !r.posted) {
                     <span class="pg-chip">Due</span>
                   }
                 </td>

src/app/investment/bond-investment/bond-investment.component.ts

@@ -58,6 +58,7 @@ import { exportWorkbook } from '../investment-export';
 import {
   InvestmentDailyRateDto,
   InvestmentInterestDueDto,
+  InvestmentInterestPostingDto,
   InvestmentInterestRowDto,
   InvestmentInterestScheduleDto,
   InvestmentPurchaseDto,
@@ -243,11 +244,42 @@ export class BondInvestmentComponent implements OnInit {
         this.holdings = purchases.map(toHolding);
         this.txns = purchases.map((d) => this.purchaseTxn(d));
         this.purchaseForm = this.blankPurchaseForm();
+        this.loadInterestLog();
       },
       error: (err) => this.toast(`Could not load purchases: ${apiErrorMessage(err)}`)
     });
   }
 
+  /** Posted coupons / provisions join the purchases in the transaction log, latest date first. */
+  private loadInterestLog(): void {
+    this.investmentService.getInterestPostings().subscribe({
+      next: (postings) => {
+        const others = this.txns.filter((t) => !(t.txnType === 'INTEREST' && t.voucherNo.startsWith('JV/')));
+        this.txns = [
+          ...others,
+          ...postings.map((x) => this.interestTxn(x))
+        ].sort((a, b) => parseDDMMYYYY(b.txnDate).getTime() - parseDDMMYYYY(a.txnDate).getTime());
+      },
+      error: () => undefined
+    });
+  }
+
+  /** A coupon shows the cash received into the bank; a provision the interest booked as receivable. */
+  private interestTxn(x: InvestmentInterestPostingDto): InvestmentTxn {
+    const coupon = x.lineType === 'COUPON';
+    return {
+      certNo: x.certNo,
+      instrumentType: x.bondType as InstrumentType,
+      txnType: 'INTEREST',
+      voucherNo: x.voucherNo,
+      txnDate: x.intDate,
+      amount: coupon ? x.grossInterest : x.amount,
+      particulars: `${coupon ? 'Coupon' : 'Provision'} ${x.fromDate} to ${x.toDate} - Deal ${x.dealNo} - ${x.scriptDesc}`,
+      glCode: x.drGlCode,
+      glName: `${x.drGlName} / Cr ${x.incomeGlCode} (txn ${x.glTransactionId})`
+    };
+  }
+
   /** A purchase reaches the GL only when it is settled, dated the settlement date. */
   private purchaseTxn(d: InvestmentPurchaseDto): InvestmentTxn {
     const posted = !!d.glTransactionId;
@@ -1128,6 +1160,7 @@ export class BondInvestmentComponent implements OnInit {
         );
         this.retrieveInterestSchedule();
         this.loadDueInterest();
+        this.loadInterestLog();
       },
       error: (err) => {
         this.intPosting = false;
@@ -1531,8 +1564,20 @@ export class BondInvestmentComponent implements OnInit {
   }
 
   // -------------------- Helpers --------------------
+  /**
+   * Interest earned since the last coupon up to the as-on date (30/360), as the backend schedule counts it.
+   * Coupons fall every six months from the purchase's last interest date; a coupon received resets it to zero.
+   */
   accrued(h: InvestmentHolding): number {
-    return accruedInterest(h, this.asOnDate);
+    if (!h.lastIntDate || h.status !== 'ACTIVE') {
+      return h.lastIntDate ? 0 : accruedInterest(h, this.asOnDate);
+    }
+    const asOn = parseDDMMYYYY(this.asOnDate) > parseDDMMYYYY(h.maturityDate) ? h.maturityDate : this.asOnDate;
+    let lastCoupon = h.lastIntDate;
+    for (let k = 1; parseDDMMYYYY(addPeriod(h.lastIntDate, 0, 6 * k)) <= parseDDMMYYYY(asOn); k++) {
+      lastCoupon = addPeriod(h.lastIntDate, 0, 6 * k);
+    }
+    return Math.round((h.faceValue * (h.interestRate / 100) * days360(lastCoupon, asOn)) / 360);
   }
 
   maturity(h: InvestmentHolding): number {