import NextAuth from 'next-auth';
import { PrismaAdapter } from '@auth/prisma-adapter';
import { authConfig } from './auth.config';
import prisma from '@/lib/prisma';
import { buildAuthProviders } from '@/lib/auth-providers';

export const { auth, signIn, signOut, handlers } = NextAuth({
  ...authConfig,
  adapter: PrismaAdapter(prisma),
  providers: buildAuthProviders(),
  events: {
    async createUser({ user }) {
      const adminEmail = process.env.ADMIN_EMAIL?.toLowerCase();
      if (!adminEmail || !user.id || user.email?.toLowerCase() !== adminEmail) {
        return;
      }
      await prisma.user.update({
        where: { id: user.id },
        data: { role: 'ADMIN', emailVerified: new Date() },
      });
    },
  },
  callbacks: {
    ...authConfig.callbacks,
    async signIn({ user, account }) {
      if (account?.provider === 'google' && user.email) {
        const email = user.email.toLowerCase();
        const adminEmail = process.env.ADMIN_EMAIL?.toLowerCase();
        const existing = await prisma.user.findUnique({ where: { email } });
        if (existing && adminEmail && email === adminEmail && existing.role !== 'ADMIN') {
          await prisma.user.update({
            where: { id: existing.id },
            data: { role: 'ADMIN', emailVerified: new Date() },
          });
        }
      }
      return true;
    },
    async jwt({ token, user }) {
      if (user?.id) {
        token.id = user.id;
        const dbUser = await prisma.user.findUnique({
          where: { id: user.id },
          select: { role: true },
        });
        token.role = dbUser?.role ?? 'USER';
      } else if (token.sub) {
        const dbUser = await prisma.user.findUnique({
          where: { id: token.sub },
          select: { role: true },
        });
        if (dbUser) {
          token.id = token.sub;
          token.role = dbUser.role;
        }
      }
      return token;
    },
  },
});