import { AuthOptions } from "next-auth";
import CredentialsProvider from "next-auth/providers/credentials";
import bcrypt from "bcryptjs";
import { getDb } from "./mongodb";
import { User } from "@/types/quiz";

export const authOptions: AuthOptions = {
  providers: [
    CredentialsProvider({
      name: "Credentials",
      credentials: {
        username: { label: "Username", type: "text" },
        password: { label: "Password", type: "password" },
      },
      async authorize(credentials) {
        if (!credentials?.username || !credentials?.password) return null;

        const db = await getDb();
        const user = await db.collection("users").findOne({ username: credentials.username }) as unknown as User | null;
        if (!user) return null;

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

        return {
          id: user.id,
          name: user.username,
          role: user.role,
        };
      },
    }),
  ],
  callbacks: {
    async jwt({ token, user }) {
      if (user) {
        token.role = (user as { role: "admin" | "user" }).role;
      }
      return token;
    },
    async session({ session, token }) {
      if (session.user) {
        (session.user as { role?: string }).role = token.role as string;
        (session.user as { id?: string }).id = token.sub as string;
      }
      return session;
    },
  },
  pages: {
    signIn: "/login",
  },
  session: {
    strategy: "jwt",
  },
};