import NextAuth, { type DefaultSession } from 'next-auth';
import GitHub from 'next-auth/providers/github';
import Google from 'next-auth/providers/google';
import { dbFindOrCreateUser } from './lib/db/functions';
import { redirect } from 'next/navigation';

declare module 'next-auth' {
  interface Session {
    user: {
      /** The user's id. */
      id: string;
    } & DefaultSession['user'];
  }
}

const restrictedPath = ['/project'];

export const {
  handlers: { GET, POST },
  auth,
} = NextAuth({
  providers: [
    GitHub,
    Google({
      clientId: process.env.GOOGLE_CLIENT_ID!,
      clientSecret: process.env.GOOGLE_SECRET!,
    }),
  ],
  callbacks: {
    async signIn({ profile, user }) {
      if (!profile) {
        return false;
      }
      const { email, name } = profile;

      if (!email || !name) {
        return false;
      }

      const dbUser = await dbFindOrCreateUser(email, name);

      if (dbUser) {
        user.id = dbUser.id;
        return true;
      }
      return false;
    },
    async jwt({ token, profile, user }) {
      if (profile) {
        token.id = profile.id || profile.sub;
        token.image = profile.avatar_url || profile.picture;
      }
      return token;
    },
    async session({ session, token }) {
      // TODO: this is temporary between we switch DB and make migration
      // so also UI might still have session, DB might already have cleaned up
      const email = session?.user?.email;
      const name = session?.user?.name;
      if (email && name) {
        const dbUser = await dbFindOrCreateUser(email, name);
        // put db user id into session
        session.user.id = dbUser.id;
      }
      return session;
    },
    authorized({ request, auth }) {
      const isAdmin = !!auth?.user?.email?.endsWith('landing.ai');
      return restrictedPath.find(path =>
        request.nextUrl.pathname.startsWith(path),
      )
        ? isAdmin
        : true;
    },
  },
  pages: {
    signIn: '/sign-in', // overrides the next-auth default signin page https://authjs.dev/guides/basics/pages
  },
});

export async function sessionUser() {
  const session = await auth();
  const email = session?.user.email;
  return {
    email,
    isAdmin: !!email?.endsWith('landing.ai'),
    id: session?.user.id ?? null,
    user: session?.user ?? null,
  };
}