import { NextResponse } from 'next/server';
import { getSession } from '@/lib/auth/session';
import { getGHLClientForUser } from '@/lib/ghl/helpers';

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

    const { user } = session;

    // Try to get real stats from GHL if configured
    const ghlClient = await getGHLClientForUser(user.id);

    if (ghlClient) {
      try {
        // Fetch real data from GHL
        const [contactsResponse, conversationsResponse, opportunitiesResponse] = await Promise.allSettled([
          ghlClient.contacts.getAll({ limit: 1 }), // Just to get count from meta
          ghlClient.conversations.getAll({ limit: 1 }),
          ghlClient.opportunities.getAll({ limit: 100 }),
        ]);

        let totalContacts = 0;
        let activeConversations = 0;
        let openOpportunities = 0;
        let pipelineValue = 0;

        if (contactsResponse.status === 'fulfilled') {
          totalContacts = contactsResponse.value.meta?.total || 0;
        }

        if (conversationsResponse.status === 'fulfilled') {
          activeConversations = conversationsResponse.value.data?.length || 0;
        }

        if (opportunitiesResponse.status === 'fulfilled') {
          const opportunities = opportunitiesResponse.value.data || [];
          openOpportunities = opportunities.filter((o: any) => o.status === 'open').length;
          pipelineValue = opportunities.reduce((sum: number, o: any) => {
            return sum + (parseFloat(o.monetaryValue) || 0);
          }, 0);
        }

        return NextResponse.json({
          totalContacts,
          activeConversations,
          openOpportunities,
          pipelineValue,
        });
      } catch (ghlError) {
        console.error('GHL fetch error:', ghlError);
        // Fall through to return mock stats
      }
    }

    // Return mock stats for users without GHL configured
    return NextResponse.json({
      totalContacts: 0,
      activeConversations: 0,
      openOpportunities: 0,
      pipelineValue: 0,
    });
  } catch (error) {
    console.error('Dashboard stats error:', error);
    return NextResponse.json({ error: 'Failed to fetch stats' }, { status: 500 });
  }
}