import NextAuth from 'next-auth';
import GoogleProvider from 'next-auth/providers/google';
import CredentialsProvider from 'next-auth/providers/credentials';

// In-memory user store (for demo only)
type User = { email: string; password: string };
declare global {
  // eslint-disable-next-line no-var
  var _users: User[] | undefined;
}
const users: User[] = global._users || (global._users = []);

const handler = NextAuth({
  providers: [
    GoogleProvider({
      clientId: process.env.GOOGLE_CLIENT_ID ?? '',
      clientSecret: process.env.GOOGLE_CLIENT_SECRET ?? '',
    }),
    CredentialsProvider({
      name: 'Credentials',
      credentials: {
        email: { label: "Email", type: "email" },
        password: { label: "Password", type: "password" }
      },
      async authorize(credentials) {
        if (!credentials?.email || !credentials?.password) return null;
        // Check in-memory user store
        const user = users.find(
          (u) => u.email === credentials.email && u.password === credentials.password
        );
        if (user) {
          return {
            id: user.email,
            email: user.email,
            name: user.email.split('@')[0],
          };
        }
        // For demo, still allow the test user
        if (credentials.email === "test@example.com" && credentials.password === "password") {
          return {
            id: "1",
            email: credentials.email,
            name: "Test User",
          };
        }
        return null;
      }
    }),
  ],
  pages: {
    signIn: '/account/login',
    // signUp: '/account/register', // Uncomment when register page is ready
    // error: '/account/error', // Uncomment when error page is ready
  },
  callbacks: {
    async session({ session, token }) {
      // Add any additional user data to the session here
      return session;
    },
    async jwt({ token, user }) {
      // Add any additional user data to the JWT here
      if (user) {
        token.id = user.id;
      }
      return token;
    },
  },
})

export { handler as GET, handler as POST }