// app/api/auth/[...nextauth]/route.ts
import NextAuth from 'next-auth';
import CredentialsProvider from 'next-auth/providers/credentials';
import { PrismaClient } from '@prisma/client';
import { compare } from 'bcryptjs';

const prisma = new PrismaClient();

const handler = NextAuth({
  providers: [
    CredentialsProvider({
      name: 'Credentials',
      credentials: {
        email: {
          label: 'Benutzername oder E-Mail',
          type: 'text',
        },
        password: {
          label: 'Passwort',
          type: 'password',
        },
      },
      async authorize(credentials) {
        if (!credentials?.email || !credentials.password) {
          return null;
        }

        const identifier = credentials.email.trim();

        // User per E-Mail ODER Benutzername suchen
        const user = await prisma.user.findFirst({
          where: {
            OR: [
              { email: identifier },
              { username: identifier },
            ],
          },
        });

        if (!user || !user.passwordHash) {
          return null;
        }

        const isValid = await compare(credentials.password, user.passwordHash);
        if (!isValid) {
          return null;
        }

        // Minimal-Userobjekt für NextAuth zurückgeben
        return {
          id: user.id,
          name: user.name ?? user.username ?? user.email,
          email: user.email,
        };
      },
    }),
  ],
  pages: {
    signIn: '/login',
  },
  session: {
    strategy: 'jwt',
  },
  callbacks: {
    async jwt({ token, user }) {
      // beim Login User-ID in den Token schreiben
      if (user) {
        token.id = user.id;
      }
      return token;
    },
    async session({ session, token }) {
      // ID aus dem Token wieder in die Session kopieren
      if (session.user && token.id) {
        (session.user as any).id = token.id;
      }
      return session;
    },
  },
});

export { handler as GET, handler as POST };