import { NextRequest, NextResponse } from "next/server";
import { auth } from '@/auth'
import { prisma } from '@/lib/prisma'

export async function GET(request: NextRequest) {
  try {
    const session = await auth()
    if (!session?.user || session.user.role !== 'ADMIN') {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    const { searchParams } = new URL(request.url)
    const page = parseInt(searchParams.get('page') || '1')
    const limit = parseInt(searchParams.get('limit') || '10')
    const search = searchParams.get('search')
    const role = searchParams.get('role')
    const skip = (page - 1) * limit

    const where: any = {}

    if (search) {
      where.OR = [
        { name: { contains: search, mode: 'insensitive' } },
        { email: { contains: search, mode: 'insensitive' } },
      ]
    }

    if (role) {
      where.role = role
    }

    const [users, total] = await Promise.all([
      prisma.user.findMany({
        where,
        select: {
          id: true,
          name: true,
          email: true,
          role: true,
          isActive: true,
          joinedAt: true,
          referralCode: true,
          referrer: {
            select: {
              name: true,
              email: true,
            },
          },
          _count: {
            select: {
              referrals: true,
              orders: true,
            },
          },
        },
        skip,
        take: limit,
        orderBy: { joinedAt: 'desc' },
      }),
      prisma.user.count({ where }),
    ])

    return NextResponse.json({
      users,
      pagination: {
        page,
        limit,
        total,
        pages: Math.ceil(total / limit),
      },
    })
  } catch (error) {
    console.error('Admin users API error:', error)
    return NextResponse.json({ error: 'Internal server error' }, { status: 500 })
  }
}