From 7a3ddcc7beb420c3e1ecaff74eae8ff65ef6dc98 Mon Sep 17 00:00:00 2001
From: SepehrYahyaee <7heycallmegray@gmail.com>
Date: Sat, 11 Jul 2026 12:23:00 +0330
Subject: [PATCH] YARA-937

---
 .../exceptions/business-rule.exception.ts     | 25 +++++++++++++++++++
 src/expert-claim/expert-claim.service.ts      |  7 +++++-
 .../expert-claim.v2.controller.ts             | 15 ++++++++++-
 3 files changed, 45 insertions(+), 2 deletions(-)
 create mode 100644 src/expert-claim/exceptions/business-rule.exception.ts

diff --git a/src/expert-claim/exceptions/business-rule.exception.ts b/src/expert-claim/exceptions/business-rule.exception.ts
new file mode 100644
index 0000000..97c7d7a
--- /dev/null
+++ b/src/expert-claim/exceptions/business-rule.exception.ts
@@ -0,0 +1,25 @@
+import { HttpException, HttpStatus } from "@nestjs/common";
+
+/**
+ * Thrown when a well-formed request violates a business rule that cannot be
+ * expressed as a generic validation error.  Returns HTTP 422 with a structured
+ * body so the frontend can branch on `errorCode` without string-matching the
+ * human-readable `message`.
+ *
+ * Response body shape:
+ * ```json
+ * { "errorCode": "SOME_CODE", "message": "Human-readable explanation." }
+ * ```
+ */
+export class BusinessRuleException extends HttpException {
+  constructor(
+    public readonly errorCode: string,
+    message: string,
+  ) {
+    super({ errorCode, message }, HttpStatus.UNPROCESSABLE_ENTITY);
+  }
+}
+
+export const BusinessErrorCode = {
+  DAMAGE_EXPERT_RESEND_LIMIT_EXCEEDED: "DAMAGE_EXPERT_RESEND_LIMIT_EXCEEDED",
+} as const;
diff --git a/src/expert-claim/expert-claim.service.ts b/src/expert-claim/expert-claim.service.ts
index 7681b88..bb8b645 100644
--- a/src/expert-claim/expert-claim.service.ts
+++ b/src/expert-claim/expert-claim.service.ts
@@ -12,6 +12,10 @@ import {
   Logger,
   NotFoundException,
 } from "@nestjs/common";
+import {
+  BusinessErrorCode,
+  BusinessRuleException,
+} from "./exceptions/business-rule.exception";
 import { distance as stringDistance } from "fastest-levenshtein"; // حتما نصب بشه
 import { Types } from "mongoose";
 import { lastValueFrom } from "rxjs";
@@ -3013,7 +3017,8 @@ export class ExpertClaimService {
     }
 
     if (existingResend?.fulfilledAt) {
-      throw new BadRequestException(
+      throw new BusinessRuleException(
+        BusinessErrorCode.DAMAGE_EXPERT_RESEND_LIMIT_EXCEEDED,
         "The owner has already fulfilled a damage-expert resend for this claim. You cannot request another resend.",
       );
     }
diff --git a/src/expert-claim/expert-claim.v2.controller.ts b/src/expert-claim/expert-claim.v2.controller.ts
index 7ddc4a0..410bd8b 100644
--- a/src/expert-claim/expert-claim.v2.controller.ts
+++ b/src/expert-claim/expert-claim.v2.controller.ts
@@ -281,7 +281,20 @@ export class ExpertClaimV2Controller {
     description:
       "Claim must be locked by this expert (`EXPERT_REVIEWING`). Sets `WAITING_FOR_USER_RESEND`, `USER_EXPERT_RESEND`, `NEEDS_REVISION`, clears the lock, and stores `evaluation.damageExpertResend`. " +
       "Owner completes via document/capture endpoints or `POST .../expert-resend/acknowledge` when only instructions were given.\n\n" +
-      "**One resend per claim lifecycle:** if the owner has already fulfilled a resend (`damageExpertResend.fulfilledAt`), this endpoint returns **400**—the expert may only submit a priced reply or request in-person visit afterward.",
+      "**One resend per claim lifecycle:** if the owner has already fulfilled a resend (`damageExpertResend.fulfilledAt`), this endpoint returns **422** with `errorCode: DAMAGE_EXPERT_RESEND_LIMIT_EXCEEDED`—the expert may only submit a priced reply or request in-person visit afterward.",
+  })
+  @ApiResponse({
+    status: 422,
+    description:
+      "Business rule violation: resend limit exceeded. " +
+      "`errorCode: DAMAGE_EXPERT_RESEND_LIMIT_EXCEEDED` — the owner has already fulfilled a prior resend request for this claim.",
+    schema: {
+      example: {
+        errorCode: "DAMAGE_EXPERT_RESEND_LIMIT_EXCEEDED",
+        message:
+          "The owner has already fulfilled a damage-expert resend for this claim. You cannot request another resend.",
+      },
+    },
   })
   @ApiParam({ name: "claimRequestId" })
   @ApiBody({ type: ClaimSubmitResendV2Dto })