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'
    });

    if (!session.accessToken) {
      return NextResponse.json({ error: "No access token found" }, { status: 401 });
    }

    // First get the username from Keycloak
    const keycloakResponse = await fetch(
      `${process.env.KEYCLOAK_BASE_URL}/realms/${process.env.KEYCLOAK_REALM}/protocol/openid-connect/userinfo`,
      {
        headers: {
          'Authorization': `Bearer ${session.accessToken}`
        }
      }
    );

    if (!keycloakResponse.ok) {
      console.error('Failed to get Keycloak user info:', {
        status: keycloakResponse.status,
        statusText: keycloakResponse.statusText,
        response: await keycloakResponse.text().catch(() => 'Could not get response text')
      });
      return NextResponse.json(
        { error: "Failed to get user info from Keycloak" },
        { status: keycloakResponse.status }
      );
    }

    const keycloakUser = await keycloakResponse.json();
    const username = keycloakUser.preferred_username;

    console.log('Keycloak user info:', {
      username,
      sub: keycloakUser.sub
    });

    if (!username) {
      return NextResponse.json(
        { error: "No username found in Keycloak user info" },
        { status: 400 }
      );
    }

    // Now get user info from Rocket.Chat using the Keycloak username
    const meResponse = await fetch('https://parole.slm-lab.net/api/v1/me', {
      headers: {
        'Authorization': `Bearer ${session.accessToken}`,
        'X-Auth-Token': session.accessToken,
        'X-User-Id': keycloakUser.sub,
        'X-Oauth-User': username,
        'X-OAuth-Username': username
      },
      cache: 'no-store',
    });

    if (!meResponse.ok) {
      console.error('Rocket.Chat me error:', {
        status: meResponse.status,
        statusText: meResponse.statusText,
        headers: {
          'X-Oauth-User': username,
          'X-OAuth-Username': username,
          'Authorization': 'Bearer [hidden]'
        },
        response: await meResponse.text().catch(() => 'Could not get response text')
      });
      return NextResponse.json(
        { error: "Failed to get user info from Rocket.Chat" },
        { status: meResponse.status }
      );
    }

    const userData = await meResponse.json();
    console.log('Rocket.Chat user data:', {
      userId: userData._id,
      username: userData.username
    });

    // Get the user's subscriptions (rooms they are in)
    const subscriptionsResponse = await fetch(
      'https://parole.slm-lab.net/api/v1/subscriptions.get',
      {
        headers: {
          'Authorization': `Bearer ${session.accessToken}`,
          'X-Auth-Token': session.accessToken,
          'X-User-Id': userData._id,
          'X-Oauth-User': username,
          'X-OAuth-Username': username
        },
        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: {
              'Authorization': `Bearer ${session.accessToken}`,
              'X-Auth-Token': session.accessToken,
              'X-User-Id': userData._id,
              'X-Oauth-User': username,
              'X-OAuth-Username': username
            },
            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 }
    );
  }
}