login logic fix

auth.ts

@@ -1,6 +1,12 @@
 // src/auth.ts
 import NextAuth from "next-auth";
 import Google from "next-auth/providers/google";
+import { PrismaClient } from "@/app/generated/prisma";
+import { randomBytes } from "crypto";
+
+function generateRegisterCode(): string {
+  return randomBytes(16).toString("hex");
+}
 
 export const { handlers, auth, signIn, signOut } = NextAuth({
   providers: [
@@ -13,6 +19,7 @@ export const { handlers, auth, signIn, signOut } = NextAuth({
   
   events: {
     async signIn({ user, account, profile }) {
+
       console.log("[NextAuth] signIn user:", {
         id: (user as any)?.id,
         name: user?.name,
@@ -20,6 +27,41 @@ export const { handlers, auth, signIn, signOut } = NextAuth({
         image: (user as any)?.image,
         provider: account?.provider,
       });
+
+      // Upsert User (by email)
+      try {
+        const prisma = new PrismaClient();
+        const email = user?.email ?? "";
+        if (!email) {
+          console.warn("[NextAuth] Missing email, skip user upsert");
+          return;
+        }
+
+        const existing = await prisma.user.findFirst({ where: { email } });
+        if (existing) {
+          const registerCodeData = existing.RegisgerCode
+            ? {}
+            : { RegisgerCode: generateRegisterCode() };
+          await prisma.user.update({
+            where: { id: existing.id },
+            data: {
+              icon: (user as any)?.image ?? existing.icon,
+              ...registerCodeData,
+            },
+          });
+        } else {
+          await prisma.user.create({
+            data: {
+              email,
+              icon: (user as any)?.image ?? "",
+              RegisgerCode: generateRegisterCode(),
+            },
+          });
+        }
+        await prisma.$disconnect();
+      } catch (e) {
+        console.error("[NextAuth] User upsert failed", e);
+      }
     },
   },
 });