kyc exception at client creation time and some tds work

src/app/clients/kyc-exception.util.ts

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+/**
+ * Copyright since 2025 Mifos Initiative
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * Derives a client's KYC exception state from their verification status.
+ *
+ * A KYC exception is not something an officer should have to remember to tick — it is simply the
+ * fact that a mandatory identity check has not passed. Deriving it means the exception list can
+ * never drift out of step with reality: raising, narrowing and closing all fall out of whether PAN
+ * and Aadhaar are verified at the moment of the save.
+ *
+ * Shared by the client-creation stepper and the client-view KYC tab so both write identical state.
+ */
+
+export const KYC_EXCEPTION_PAN = 'PAN Card Verification Failed';
+export const KYC_EXCEPTION_AADHAAR = 'Aadhaar Verification Failed';
+
+/** The two reasons this module owns. Anything else on a record was added by an officer by hand. */
+export const AUTO_MANAGED_KYC_EXCEPTION_REASONS: string[] = [
+  KYC_EXCEPTION_PAN,
+  KYC_EXCEPTION_AADHAAR
+];
+
+export interface KycExceptionInput {
+  /** PAN verified against the Income Tax database. Unverified OR simply not entered → exception. */
+  panVerified: boolean;
+  /** Aadhaar verified against UIDAI. Unverified OR simply not entered → exception. */
+  aadhaarVerified: boolean;
+  /**
+   * False for non-individual clients, where no Aadhaar is collected (the payload sends a dummy
+   * masked value). Without this guard every company would carry a permanent Aadhaar exception.
+   */
+  aadhaarApplicable: boolean;
+  /** Whether an exception is already recorded — decides raise vs. resolve on a clean save. */
+  hadException: boolean;
+  /** Reason currently persisted, kept verbatim when closing so the audit trail survives. */
+  previousReason: string | null;
+  /** Officer-entered reasons beyond the two automatic ones; carried through untouched. */
+  manualReasons?: string[];
+  /** Today in the tenant's date format — stamped as exceptionResolvedOn when closing. */
+  todayFormatted: string;
+}
+
+export interface KycExceptionFields {
+  isException: boolean;
+  exceptionReason: string | null;
+  exceptionResolved: boolean;
+  exceptionResolvedOn: string | null;
+}
+
+/**
+ * Maps verification status to the four exception columns the API expects.
+ *
+ * Three outcomes:
+ * - **Something outstanding** → raise/keep the exception, listing only what is still failing. A
+ *   record that had both PAN and Aadhaar outstanding and has since verified PAN comes back with
+ *   Aadhaar alone, which is what narrows the entry rather than closing it.
+ * - **Nothing outstanding, exception existed** → close it. `exceptionReason` is retained on
+ *   purpose: the Resolved tab shows what was resolved, and clearing it would erase the record of
+ *   why the exception was ever raised.
+ * - **Nothing outstanding, no exception** → leave every flag off, so a clean client never appears
+ *   in either tab.
+ */
+export function deriveKycExceptionFields(input: KycExceptionInput): KycExceptionFields {
+  const outstanding: string[] = [];
+
+  if (!input.panVerified) {
+    outstanding.push(KYC_EXCEPTION_PAN);
+  }
+  if (input.aadhaarApplicable && !input.aadhaarVerified) {
+    outstanding.push(KYC_EXCEPTION_AADHAAR);
+  }
+
+  // Officer-added reasons ride along, but the two automatic ones are filtered out first — a stale
+  // 'PAN Card Verification Failed' left in the form must not survive PAN actually being verified.
+  for (const reason of input.manualReasons || []) {
+    const trimmed = (reason || '').trim();
+    if (trimmed && !AUTO_MANAGED_KYC_EXCEPTION_REASONS.includes(trimmed) && !outstanding.includes(trimmed)) {
+      outstanding.push(trimmed);
+    }
+  }
+
+  if (outstanding.length > 0) {
+    return {
+      isException: true,
+      exceptionReason: outstanding.join(', '),
+      exceptionResolved: false,
+      exceptionResolvedOn: null
+    };
+  }
+
+  if (input.hadException) {
+    return {
+      isException: false,
+      exceptionReason: input.previousReason || null,
+      exceptionResolved: true,
+      exceptionResolvedOn: input.todayFormatted
+    };
+  }
+
+  return {
+    isException: false,
+    exceptionReason: null,
+    exceptionResolved: false,
+    exceptionResolvedOn: null
+  };
+}