import { getServerSession } from "next-auth";
import { authOptions } from "@/app/api/auth/[...nextauth]/route";
import { NextResponse } from "next/server";

export async function GET() {
  try {
    const session = await getServerSession(authOptions);
    if (!session) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }

    if (!session.user?.email) {
      return NextResponse.json({ error: "No email found in session" }, { status: 400 });
    }

    // Get the user's info from Rocket.Chat using their email
    const userInfoResponse = await fetch(
      `https://parole.slm-lab.net/api/v1/users.info?email=${encodeURIComponent(session.user.email)}`,
      {
        method: 'GET',
        headers: {
          'X-Auth-Token': 'C_3ekrsgtsaU0sVQzpJ8aRSyMQjBIvcsmXVvBI8Wmgb',
          'X-User-Id': 'Tpuww59PJKsrGNQJB',
        },
        cache: 'no-store',
      }
    );

    if (!userInfoResponse.ok) {
      console.error('Rocket.Chat user info error:', {
        status: userInfoResponse.status,
        statusText: userInfoResponse.statusText,
        email: session.user.email,
      });
      return NextResponse.json(
        { error: "Failed to fetch user info" },
        { status: userInfoResponse.status }
      );
    }

    const userInfo = await userInfoResponse.json();
    const userId = userInfo.user._id;

    // Get the user's subscriptions (rooms they are in)
    const subscriptionsResponse = await fetch(
      `https://parole.slm-lab.net/api/v1/subscriptions.get?userId=${userId}`,
      {
        headers: {
          'X-Auth-Token': 'C_3ekrsgtsaU0sVQzpJ8aRSyMQjBIvcsmXVvBI8Wmgb',
          'X-User-Id': 'Tpuww59PJKsrGNQJB',
        },
        cache: 'no-store',
      }
    );

    if (!subscriptionsResponse.ok) {
      console.error('Rocket.Chat subscriptions error:', {
        status: subscriptionsResponse.status,
        statusText: subscriptionsResponse.statusText,
      });
      return NextResponse.json(
        { error: "Failed to fetch subscriptions" },
        { status: subscriptionsResponse.status }
      );
    }

    const subscriptions = await subscriptionsResponse.json();
    if (!subscriptions.update || subscriptions.update.length === 0) {
      return NextResponse.json({ messages: [] });
    }

    // Get the last message from each room
    const messages = await Promise.all(
      subscriptions.update.map(async (room: any) => {
        if (!room.lastMessage?._id) return null;
        
        const messageResponse = await fetch(
          `https://parole.slm-lab.net/api/v1/chat.getMessage?msgId=${room.lastMessage._id}`,
          {
            headers: {
              'X-Auth-Token': 'C_3ekrsgtsaU0sVQzpJ8aRSyMQjBIvcsmXVvBI8Wmgb',
              'X-User-Id': 'Tpuww59PJKsrGNQJB',
            },
            cache: 'no-store',
          }
        );

        if (messageResponse.ok) {
          const messageData = await messageResponse.json();
          return {
            ...messageData.message,
            roomName: room.name || 'Direct Message',
            roomType: room.t,
          };
        }
        return null;
      })
    );

    // Filter out any null messages and sort by timestamp
    const validMessages = messages
      .filter((msg): msg is NonNullable<typeof msg> => msg !== null)
      .sort((a, b) => new Date(b.ts).getTime() - new Date(a.ts).getTime());

    return NextResponse.json({ messages: validMessages });
  } catch (error) {
    console.error('Error fetching messages:', error);
    return NextResponse.json(
      { error: "Internal server error" },
      { status: 500 }
    );
  }
}