import type { NextAuthOptions } from "next-auth";
import CredentialsProvider from "next-auth/providers/credentials";

export const authOptions: NextAuthOptions = {
  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 adminEmail = process.env.ADMIN_EMAIL;
        const adminPassword = process.env.ADMIN_PASSWORD;

        if (!adminEmail || !adminPassword) {
          throw new Error("ADMIN_EMAIL and ADMIN_PASSWORD env vars must be set");
        }

        if (
          credentials.email === adminEmail &&
          credentials.password === adminPassword
        ) {
          // Return minimal session user — no DB lookup needed
          return { id: "admin", email: adminEmail, name: "Admin" };
        }

        return null; // null = unauthorized (NextAuth returns 401)
      },
    }),
  ],
  session: {
    strategy: "jwt",       // stateless JWT — no DB session table (per D-03)
    maxAge: 7 * 24 * 60 * 60,  // 7 days (reduced from 30 for security)
    updateAge: 24 * 60 * 60,   // rotate token daily on active use
  },
  pages: {
    signIn: "/admin/login",   // custom login page (per D-07)
  },
  callbacks: {
    async jwt({ token, user }) {
      if (user) {
        token.id = user.id;
      }
      return token;
    },
    async session({ session, token }) {
      if (session.user) {
        (session.user as { id?: string }).id = token.id as string;
      }
      return session;
    },
  },
};