Giveaway-app/src/app/api/auth/[...nextauth]/route.ts

import NextAuth, { SessionStrategy } from "next-auth";
import GoogleProvider from "next-auth/providers/google";
import { PrismaAdapter } from "@next-auth/prisma-adapter";
import { db } from "@/lib/db";
import axios from "axios";

if (!db) {
  throw new Error("Prisma client is not initialized. Check your database configuration.");
}

export const authOptions = {
  adapter: PrismaAdapter(db),
  providers: [
    GoogleProvider({
      clientId: process.env.GOOGLE_CLIENT_ID!,
      clientSecret: process.env.GOOGLE_CLIENT_SECRET!,
      allowDangerousEmailAccountLinking: true,
      authorization: {
        params: {
          scope: "openid email profile https://www.googleapis.com/auth/youtube.readonly",
        },
      },
    }),
  ],
  secret: process.env.NEXTAUTH_SECRET,
  session: {
    strategy: "database" as SessionStrategy,
  },
  callbacks: {
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    async signIn({ user, account, profile }: { user: any; account: any; profile?: any }) {
      if (!user || !account || !profile) {
        console.error("Sign-in failed: Missing user, account, or profile data.");
        return false;
      }

      if (account.provider === "google" && account.access_token) {
        try {
          console.log("Fetching YouTube handle for user:", user.email);
          const { data } = await axios.get("https://www.googleapis.com/youtube/v3/channels?part=snippet&mine=true", {
            params: {
              part: "brandingSettings",
              mine: "true",
            },
            headers: {
              Authorization: `Bearer ${account.access_token}`,
            },
          });

          console.log("YouTube API response:", JSON.stringify(data));

          const customUrl = data.items?.[0]?.snippet?.customUrl;

          const youtubeHandle = customUrl ;

          console.log("Fetched YouTube handle:", youtubeHandle);
          user.youtubeHandle = youtubeHandle;

        } catch (error) {
          console.error("Error fetching YouTube handle:", error);
        }
      }

      return true;
    },
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    async session({ session, user }: { session: any; user: any }) {
      session.user.id = user.id;
      session.user.youtubeHandle = user.youtubeHandle; // Only attach YouTube handle
      return session;
    },
  },
  debug: true, // Enable debug mode for detailed error messages
};

const handler = NextAuth(authOptions);

export { handler as GET, handler as POST };