import { NextResponse } from "next/server";
import { createServiceClient } from "@/lib/supabase";
import { requireAdmin } from "@/lib/admin-auth";

export const dynamic = "force-dynamic";

export async function GET() {
  const check = await requireAdmin();
  if (check instanceof NextResponse) return check;

  const db = createServiceClient();

  const { data: alleAnfragen } = await db
    .from("anfragen")
    .select("id, status, created_at, name, betreff, email");

  const anfragen = alleAnfragen ?? [];

  const kpi = {
    gesamt: anfragen.length,
    offen: anfragen.filter((a) => a.status === "offen").length,
    inBearbeitung: anfragen.filter((a) => a.status === "in_bearbeitung").length,
    abgeschlossen: anfragen.filter((a) => a.status === "abgeschlossen").length,
  };

  const heute = new Date();
  const monatsStats: { monat: string; label: string; count: number }[] = [];
  for (let i = 5; i >= 0; i--) {
    const d = new Date(heute);
    d.setMonth(d.getMonth() - i);
    const monat = `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}`;
    const label = d.toLocaleDateString("de-DE", { month: "short", year: "2-digit" });
    const count = anfragen.filter((a) => a.created_at.startsWith(monat)).length;
    monatsStats.push({ monat, label, count });
  }

  const { data: recentAnfragen } = await db
    .from("anfragen")
    .select("id, created_at, name, betreff, status, email")
    .order("created_at", { ascending: false })
    .limit(20);

  return NextResponse.json({ kpi, monatsStats, recentAnfragen: recentAnfragen ?? [] });
}