import NextAuth from 'next-auth';
import CredentialsProvider from 'next-auth/providers/credentials';
import db from '@/lib/db';
import type { User } from '@/lib/types';

export const {
  handlers: { GET, POST },
  auth,
  signIn,
  signOut,
} = NextAuth({
  secret: process.env.AUTH_SECRET,
  providers: [
    CredentialsProvider({
      name: 'Credentials',
      credentials: {
        email: { label: 'Email', type: 'email' },
        password: { label: 'Password', type: 'password' },
      },
      async authorize(credentials) {
        if (!credentials?.email || !credentials.password) {
          return null;
        }

        const email = credentials.email as string;
        const password = credentials.password as string;

        try {
          const stmt = db.prepare('SELECT * FROM users WHERE email = ?');
          const user = stmt.get(email) as User | undefined;

          // In a real app, you would use a secure password hashing library like bcrypt
          if (user && user.password === password) {
            // Return a user object that NextAuth will use to create the session
            return {
              id: user.id.toString(),
              name: user.name,
              email: user.email,
            };
          } else {
            // Invalid credentials
            return null;
          }
        } catch (error) {
          console.error('Database error during authorization:', error);
          return null;
        }
      },
    }),
  ],
  callbacks: {
    jwt({ token, user }) {
      if (user) {
        token.id = user.id;
      }
      return token;
    },
    session({ session, token }) {
      if (session.user) {
        session.user.id = token.id as string;
      }
      return session;
    },
  },
  pages: {
    signIn: '/login',
  },
});