import { NextRequest, NextResponse } from 'next/server';
import { getServerSession } from 'next-auth/next';
import DiscordOauth2 from 'discord-oauth2';
import { authOptions } from '@/lib/auth';
const oauth = new DiscordOauth2();
import { api } from '@/lib/discordClient';
import cors, { runMiddleware } from '@/lib/cors';

export async function GET(req: NextRequest,res: NextResponse) {
  await runMiddleware(req, res, cors);
 
  try {
    const session = await getServerSession(authOptions as any) as any;

    if (!session || !session.accessToken) {
      return NextResponse.json({ message: 'No session or access token found' }, { status: 401 });
    }

    const allGuilds = await oauth.getUserGuilds(session.accessToken);

    const guilds = await Promise.all(
      allGuilds
      .filter(g => Number(g.permissions) & 8)
        .map(async (guild) => {
          const isJoined = await checkGuildMembership(guild.id, session.accessToken);
          return {
            ...guild,
            isJoined,
          };
        })
    );

    return NextResponse.json({ guilds });
  } catch (error: any) {
    return NextResponse.json({ message: 'Failed to fetch guilds', error: error.message }, { status: 500 });
  }
}

async function checkGuildMembership(guildId: string, accessToken: string): Promise<boolean> {
  try {
    const guild = await api.guilds.get(guildId) as any;

    if (!guild || guild.code === 10004) { 
      console.warn(`Guild not found or bot is not in the guild (guildId: ${guildId})`);
      return false;
    }

    return !!guild.id;
  } catch (error: any) {
    if (error.rawError?.code === 10004) {
      console.error(`Unknown Guild: ${guildId}`);
    } else {
      console.error(`Failed to check guild membership for guildId ${guildId}:`, error);
    }
    return false; 
  }
}