// Duenner Client fuer das LIC-04-Backend-API (internal/adminapi) — enthaelt
// keinerlei eigene Lizenz-/Flag-Logik, nur Datenabruf und -weitergabe.
export type FlagOverview = {
  key: string;
  enabled: boolean;
  licensed: boolean;
  deny_grund?: string;
};

export type UsageOverview = {
  metric: string;
  value: number;
  limit: number;
  status: "ok" | "warning" | "exceeded";
};

export type Overview = {
  plan: string;
  modules: string[];
  issued_at: string;
  valid_until: string;
  expired: boolean;
  flags: FlagOverview[];
  usage: UsageOverview[];
};

function apiBase(): string {
  const base = process.env.NEXT_PUBLIC_ADMIN_API_URL;
  if (!base) {
    throw new Error(
      "NEXT_PUBLIC_ADMIN_API_URL ist nicht gesetzt (Umgebungsvariable erforderlich)"
    );
  }
  return base;
}

export async function fetchOverview(tenantId: string): Promise<Overview> {
  const res = await fetch(
    `${apiBase()}/admin/overview?tenant=${encodeURIComponent(tenantId)}`,
    { cache: "no-store" }
  );
  if (!res.ok) {
    const body = await res.json().catch(() => ({}));
    throw new Error(body.error || `Anfrage fehlgeschlagen (${res.status})`);
  }
  return res.json();
}

export async function toggleFlag(
  tenantId: string,
  key: string,
  enabled: boolean
): Promise<void> {
  const res = await fetch(`${apiBase()}/admin/flags/toggle`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ tenant: tenantId, key, enabled }),
  });
  if (!res.ok) {
    const body = await res.json().catch(() => ({}));
    throw new Error(body.error || `Umschalten fehlgeschlagen (${res.status})`);
  }
}