import { createClient } from '@/lib/supabase/server'
import { createAdminClient } from '@/lib/supabase/admin'
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
import { Package, ShoppingCart, Users, TrendingUp } from 'lucide-react'
import { AdminRecentOrders } from '@/components/admin/recent-orders'

// ─── KPI-Daten aus DB ────────────────────────────────────────────────────────
async function getKpis() {
  const supabase = await createClient()
  const adminDb = createAdminClient()

  const [
    { data: orders },
    { count: userCount },
    { count: productCount },
  ] = await Promise.all([
    adminDb.from('orders').select('total_price, status, created_at'),
    adminDb.from('profiles').select('*', { count: 'exact', head: true }),
    supabase.from('products').select('*', { count: 'exact', head: true }),
  ])

  const now = new Date()
  const currentYear = now.getFullYear()
  const currentMonth = now.getMonth()

  const completedOrdersThisMonth = (orders ?? []).filter(o => {
    if (o.status !== 'completed') return false
    const orderDate = new Date(o.created_at)
    return orderDate.getFullYear() === currentYear && orderDate.getMonth() === currentMonth
  })

  const totalRevenue = completedOrdersThisMonth.reduce((sum, o) => sum + Number(o.total_price), 0)
  const orderCount = (orders ?? []).length

  return { totalRevenue, orderCount, userCount: userCount ?? 0, productCount: productCount ?? 0 }
}

export default async function AdminDashboard() {
  const { totalRevenue, orderCount, userCount, productCount } = await getKpis()

  return (
    <div className="p-8 space-y-8">
      <h2 className="text-3xl font-bold tracking-tight text-gradient">Dashboard</h2>

      {/* KPI Cards – echte DB-Daten */}
      <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-4">
        <Card className="glass-dark border-white/5">
          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
            <CardTitle className="text-sm font-medium text-slate-300">Umsatz aktueller Monat</CardTitle>
            <TrendingUp className="h-4 w-4 text-primary" />
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold text-white">
              {new Intl.NumberFormat('de-DE', { style: 'currency', currency: 'EUR' }).format(totalRevenue)}
            </div>
            <p className="text-xs text-slate-400">Nur fertige Bestellungen</p>
          </CardContent>
        </Card>

        <Card className="glass-dark border-white/5">
          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
            <CardTitle className="text-sm font-medium text-slate-300">Bestellungen</CardTitle>
            <ShoppingCart className="h-4 w-4 text-primary" />
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold text-white">{orderCount}</div>
            <p className="text-xs text-slate-400">Gesamt</p>
          </CardContent>
        </Card>

        <Card className="glass-dark border-white/5">
          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
            <CardTitle className="text-sm font-medium text-slate-300">Produkte</CardTitle>
            <Package className="h-4 w-4 text-primary" />
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold text-white">{productCount}</div>
            <p className="text-xs text-slate-400">Im Katalog</p>
          </CardContent>
        </Card>

        <Card className="glass-dark border-white/5">
          <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
            <CardTitle className="text-sm font-medium text-slate-300">Kunden</CardTitle>
            <Users className="h-4 w-4 text-primary" />
          </CardHeader>
          <CardContent>
            <div className="text-2xl font-bold text-white">{userCount}</div>
            <p className="text-xs text-slate-400">Registrierte User</p>
          </CardContent>
        </Card>
      </div>

      {/* Letzte Bestellungen – Client Component mit 30s-Polling */}
      <AdminRecentOrders />
    </div>
  )
}