From ac2383c8efeae96eb0ebf1dc705b46ba25cd8f34 Mon Sep 17 00:00:00 2001
From: Gslmao <seriouscubist@gmail.com>
Date: Mon, 16 Feb 2026 01:20:57 +0530
Subject: [PATCH 1/2] changed or to nullish coalesing operator

reason: to fix build error
---
 src/lib/services/subject.ts | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/lib/services/subject.ts b/src/lib/services/subject.ts
index d0291a0..89a2223 100644
--- a/src/lib/services/subject.ts
+++ b/src/lib/services/subject.ts
@@ -1,13 +1,14 @@
 import { connectToDatabase } from "@/lib/database/mongoose";
-import { Course } from "@/db/course";
 import { IRelatedSubject } from "@/interface";
 import { escapeRegExp } from "@/lib/utils/regex";
+import { Course } from "@/db/course";
 import RelatedSubject from "@/db/relatedSubjects";
 
 export async function getCourseList(){
 	await connectToDatabase();
 	return await Course.find().lean();
 }
+
 export async function getRelatedSubjects(subject: string) {
 	await connectToDatabase();
 	const escapedSubject = escapeRegExp(subject);
@@ -15,5 +16,5 @@ export async function getRelatedSubjects(subject: string) {
 		subject: { $regex: new RegExp(`${escapedSubject}`, "i") },
 	});
 
-	return subjects[0]?.related_subjects ?? [];
-}
+	return subjects[0]?.related_subjects || [];
+}
\ No newline at end of file

From 8015b045b6a5296060f259cc269c2690fc6cc06e Mon Sep 17 00:00:00 2001
From: Gslmao <seriouscubist@gmail.com>
Date: Mon, 16 Feb 2026 03:30:20 +0530
Subject: [PATCH 2/2] refactor: refactor out service for api/subscribe

---
 src/app/api/subscribe/route.ts | 23 ++++-------------------
 src/components/Footer.tsx      |  4 ++--
 src/lib/services/subject.ts    |  2 +-
 src/lib/services/subscribe.ts  | 22 ++++++++++++++++++++++
 4 files changed, 29 insertions(+), 22 deletions(-)
 create mode 100644 src/lib/services/subscribe.ts

diff --git a/src/app/api/subscribe/route.ts b/src/app/api/subscribe/route.ts
index d65ace6..ce22818 100644
--- a/src/app/api/subscribe/route.ts
+++ b/src/app/api/subscribe/route.ts
@@ -1,6 +1,6 @@
 import { NextResponse } from "next/server";
-import { appendEmailToSheet } from "@/lib/services/google-sheets";
-import { verifyEmail } from "@devmehq/email-validator-js";
+import { customErrorHandler } from "@/lib/utils/error";
+import { subscribeEmail } from "@/lib/services/subscribe";
 
 export async function POST(req: Request) {
   try {
@@ -9,26 +9,11 @@ export async function POST(req: Request) {
     if (!email) {
       return NextResponse.json({ error: "Email is required" }, { status: 400 });
     }
+    await subscribeEmail(email);
 
-    const result = await verifyEmail({
-      emailAddress: email,
-      verifyMx: true,
-      verifySmtp: false,
-      timeout: 4000
-    });
-
-    if (!result.validFormat) {
-      return NextResponse.json({ error: "Invalid email format" }, { status: 400 });
-    }
-
-    if (!result.validMx) {
-      return NextResponse.json({ error: "Email domain is invalid" }, { status: 400 });
-    }
-
-    await appendEmailToSheet(email);
     return NextResponse.json({ message: "Email added successfully" });
   } catch (error) {
     console.error("Error adding email:", error);
-    return NextResponse.json({ error: "Failed to add email" }, { status: 500 });
+    return customErrorHandler(error, "Failed to add email");
   }
 } 
\ No newline at end of file
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
index 2d7a941..465913d 100644
--- a/src/components/Footer.tsx
+++ b/src/components/Footer.tsx
@@ -18,7 +18,7 @@ import toast from "react-hot-toast";
 
 type SubscribeResponse = {
   success?: boolean;
-  error?: string;
+  message?: string;
 };
 
 export default function Footer() {
@@ -44,7 +44,7 @@ export default function Footer() {
       })     
       .then(async (res) => {
         const data = (await res.json()) as SubscribeResponse;
-        if (!res.ok) throw new Error(data.error ?? "Something went wrong.");
+        if (!res.ok) throw new Error(data.message ?? "Something went wrong.");
         return data;
       }),
       {
diff --git a/src/lib/services/subject.ts b/src/lib/services/subject.ts
index 89a2223..b257d39 100644
--- a/src/lib/services/subject.ts
+++ b/src/lib/services/subject.ts
@@ -16,5 +16,5 @@ export async function getRelatedSubjects(subject: string) {
 		subject: { $regex: new RegExp(`${escapedSubject}`, "i") },
 	});
 
-	return subjects[0]?.related_subjects || [];
+	return subjects[0]?.related_subjects ?? [];
 }
\ No newline at end of file
diff --git a/src/lib/services/subscribe.ts b/src/lib/services/subscribe.ts
new file mode 100644
index 0000000..3f5bbfa
--- /dev/null
+++ b/src/lib/services/subscribe.ts
@@ -0,0 +1,22 @@
+import { verifyEmail } from "@devmehq/email-validator-js";
+import { appendEmailToSheet } from "@/lib/services/google-sheets";
+import { CustomError } from "@/lib/utils/error";
+
+export async function subscribeEmail(email: string) {
+  const result = await verifyEmail({
+      emailAddress: email,
+      verifyMx: true,
+      verifySmtp: false,
+      timeout: 4000
+    });
+
+  if (!result.validFormat) {
+    throw new CustomError("Invalid email format", 400);
+  }
+
+  if (!result.validMx) {
+    throw new CustomError("Email domain is invalid", 400);
+  }
+
+  await appendEmailToSheet(email);
+}
\ No newline at end of file