feat(fd): add read-only renewal preview endpoint, fix stale linked-account reads

GET /fixeddepositaccounts/{id}/renewal-preview -- shown in the FD Dashboard's Payment dialog before staff confirm a late renewal, so they see the actual numbers (linked account's rate, gap days, gap-interest amount, projected new balance) instead of confirming blind. Shares its calculation with the posting path (creditGapInterest) via a new computeGapInterestAmount helper, so the previewed number is exactly what gets credited. Also fixes fdAccount.getLinkedAccountId() returning null for an account confirmed to have linked_account_id set in the database -- every caller that needs the FD's Deposit Account Link now reads it fresh via SQL (resolveLinkedAccountId) instead of that stale JPA entity accessor. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-09-25 12:40:55 +05:30
parent 331c553164
commit 2c49d6f637
3 changed files with 178 additions and 31 deletions
@@ -114,5 +114,14 @@ public interface DepositAccountWritePlatformService {
     */
    Map<String, Object> creditGapInterestIfPastGrace(Long fdAccountId);

+    /**
+     * Read-only preview of what renewing this matured FD right now would do -- shown in the FD
+     * Dashboard's Payment dialog before staff confirm anything, never posts anything itself. Returns
+     * isMatured (false short-circuits the rest), maturityDate, renewalGracePeriodDays, withinGrace,
+     * currentBalance, gapDays, and -- only once past grace -- linkedAccountId, linkedAccountRate,
+     * gapInterestAmount and projectedBalance (the balance the new term would start from).
+     */
+    Map<String, Object> previewFdRenewal(Long fdAccountId);
+
    SavingsAccountTransaction mandatorySavingsAccountDeposit(SavingsAccountTransactionDTO accountTransactionDTO);
 }