import { NextRequest, NextResponse } from 'next/server';
import { prisma } from '@/lib/db';
import { getSession, isAdmin } from '@/lib/auth';
import { Role } from '@/types';

export async function GET(request: NextRequest) {
  const session = await getSession();
  if (!session || !isAdmin(session.user.role as Role)) {
    return NextResponse.json({ error: 'Forbidden' }, { status: 403 });
  }

  try {
    const [
      totalUsers,
      recentSignups,
      pendingDFY,
      usersWithOnboarding,
    ] = await Promise.all([
      prisma.user.count(),
      prisma.user.count({
        where: {
          createdAt: {
            gte: new Date(Date.now() - 7 * 24 * 60 * 60 * 1000),
          },
        },
      }),
      prisma.dFYRequest.count({ where: { status: 'PENDING' } }),
      prisma.user.findMany({
        include: { onboarding: true, setupStatus: true },
      }),
    ]);

    // Calculate high GCI users
    const highGCIUsers = usersWithOnboarding.filter(u =>
      u.onboarding?.gciLast12Months?.includes('100') ||
      u.onboarding?.gciLast12Months?.includes('250')
    ).length;

    // Calculate incomplete setup
    const incompleteSetup = usersWithOnboarding.filter(u =>
      !u.setupStatus?.smsConfigured || !u.setupStatus?.emailConfigured
    ).length;

    return NextResponse.json({
      stats: {
        totalUsers,
        highGCIUsers,
        incompleteSetup,
        dfyRequestsPending: pendingDFY,
        recentSignups,
      },
    });
  } catch (error) {
    return NextResponse.json({ error: 'Failed to fetch stats' }, { status: 500 });
  }
}