import type { NextAuthOptions } from "next-auth";
import DiscordProvider from "next-auth/providers/discord";
import { PrismaAdapter } from "@next-auth/prisma-adapter";
import { db } from "@/lib/db";

const adminDiscordId = process.env.ADMIN_DISCORD_ID;
const discordRedirectUrl = process.env.DISCORD_REDIRECT_URL;

const resolveAdmin = async (discordId?: string) => {
  if (!discordId) return false;
  if (adminDiscordId && discordId === adminDiscordId) return true;
  const admin = await db.admin.findUnique({ where: { discordId } });
  return Boolean(admin);
};

export const authOptions: NextAuthOptions = {
  adapter: PrismaAdapter(db),
  session: {
    strategy: "jwt",
  },
  providers: [
    DiscordProvider({
      clientId: process.env.DISCORD_CLIENT_ID ?? "",
      clientSecret: process.env.DISCORD_CLIENT_SECRET ?? "",
      authorization: {
        params: {
          scope: "identify email",
          ...(discordRedirectUrl
            ? { redirect_uri: discordRedirectUrl }
            : {}),
        },
      },
    }),
  ],
  callbacks: {
    async jwt({ token, account, profile }) {
      if (account && profile) {
        const discordProfile = profile as {
          id?: string;
          username?: string;
          avatar?: string;
        };
        token.discordId = discordProfile.id;
        token.discordUsername = discordProfile.username;
        token.discordAvatar = discordProfile.avatar;
      }

      token.isAdmin = await resolveAdmin(token.discordId as string | undefined);

      return token;
    },
    async session({ session, token }) {
      if (session.user) {
        session.user.id = token.sub ?? "";
        session.user.discordId = (token.discordId as string | undefined) ?? "";
        session.user.discordUsername =
          (token.discordUsername as string | undefined) ?? "";
        session.user.discordAvatar =
          (token.discordAvatar as string | undefined) ?? "";
        session.user.isAdmin = token.isAdmin === true;
      }
      return session;
    },
  },
  events: {
    async signIn({ user, account, profile }) {
      if (!account || account.provider !== "discord" || !profile) return;

      const discordId = (profile as { id?: string }).id;
      const discordUsername = (profile as { username?: string }).username;
      const discordAvatar = (profile as { avatar?: string }).avatar;

      if (!discordId) return;

      await db.user.update({
        where: { id: user.id },
        data: {
          discordId,
          discordUsername,
          discordAvatar,
        },
      });

      if (adminDiscordId && discordId === adminDiscordId) {
        await db.admin.upsert({
          where: { discordId },
          update: {},
          create: {
            discordId,
            userId: user.id,
          },
        });
      }
    },
  },
  pages: {
    signIn: "/auth/signin",
  },
};