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 });
    }

    // Debug log to see all session data
    console.log('Session data:', {
      user: session.user,
      accessToken: session.accessToken ? 'present' : 'missing'
    });

    // Use email prefix as username if username is not available
    const username = session.user.username || session.user.email?.split('@')[0];
    if (!username) {
      return NextResponse.json({ error: "No username or email found in session" }, { status: 400 });
    }

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

    if (!userInfoResponse.ok) {
      // If user info request fails, try searching by email
      const searchResponse = await fetch(
        `https://parole.slm-lab.net/api/v1/users.list?query={"emails.address":"${session.user.email}"}`,
        {
          method: 'GET',
          headers: {
            'X-Auth-Token': 'C_3ekrsgtsaU0sVQzpJ8aRSyMQjBIvcsmXVvBI8Wmgb',
            'X-User-Id': 'Tpuww59PJKsrGNQJB',
          },
          cache: 'no-store',
        }
      );

      if (!searchResponse.ok) {
        console.error('Rocket.Chat user search error:', {
          status: searchResponse.status,
          statusText: searchResponse.statusText,
          email: session.user.email,
          response: await searchResponse.text().catch(() => 'Could not get response text')
        });
        return NextResponse.json(
          { error: "Failed to find user" },
          { status: searchResponse.status }
        );
      }

      const searchData = await searchResponse.json();
      if (!searchData.users || searchData.users.length === 0) {
        return NextResponse.json({ error: "User not found in Rocket.Chat" }, { status: 404 });
      }

      const userInfo = { user: searchData.users[0] };
      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,
          response: await subscriptionsResponse.text().catch(() => 'Could not get response text')
        });
        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,
            };
          }
          console.error('Failed to fetch message:', {
            roomId: room._id,
            messageId: room.lastMessage._id,
            status: messageResponse.status,
            response: await messageResponse.text().catch(() => 'Could not get response text')
          });
          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 });
    }

    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,
        response: await subscriptionsResponse.text().catch(() => 'Could not get response text')
      });
      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,
          };
        }
        console.error('Failed to fetch message:', {
          roomId: room._id,
          messageId: room.lastMessage._id,
          status: messageResponse.status,
          response: await messageResponse.text().catch(() => 'Could not get response text')
        });
        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 }
    );
  }
}