// Duenner Client fuer das TEN-05-Backend-API (internal/tenantadmin) — keine
// eigene Provisioning-/Lifecycle-/Validierungslogik ausser der Pflichtfeld-
// Vorpruefung im Formular (Akzeptanzkriterium 2), die zusaetzlich serverseitig
// durchgesetzt wird.
export type TenantListItem = {
  id: string;
  slug: string;
  name: string;
  status: string;
};

export type Settings = {
  DisplayName: string;
  LogoURL: string;
  ColorScheme: string;
  Timezone: string;
  Language: string;
  Version: number;
};

export type TenantDetail = {
  id: string;
  slug: string;
  name: string;
  status: string;
  settings: Settings;
};

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

async function handle<T>(res: Response): Promise<T> {
  if (!res.ok) {
    const body = await res.json().catch(() => ({}));
    throw new Error(body.error || `Anfrage fehlgeschlagen (${res.status})`);
  }
  return res.json();
}

export async function fetchTenants(
  superadminId: string,
  search: string,
  status: string
): Promise<TenantListItem[]> {
  const params = new URLSearchParams({ superadmin: superadminId, search, status });
  const res = await fetch(`${apiBase()}/admin/tenants?${params}`, { cache: "no-store" });
  return handle<TenantListItem[]>(res);
}

export async function fetchTenantDetail(
  superadminId: string,
  slug: string
): Promise<TenantDetail> {
  const params = new URLSearchParams({ superadmin: superadminId, slug });
  const res = await fetch(`${apiBase()}/admin/tenants/detail?${params}`, { cache: "no-store" });
  return handle<TenantDetail>(res);
}

export async function updateSettings(
  superadminId: string,
  slug: string,
  displayName: string,
  colorScheme: string,
  timezone: string,
  language: string
): Promise<Settings> {
  const res = await fetch(`${apiBase()}/admin/tenants/settings`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      superadmin: superadminId,
      slug,
      display_name: displayName,
      color_scheme: colorScheme,
      timezone,
      language,
    }),
  });
  return handle<Settings>(res);
}

export type LifecycleAction =
  | "suspend"
  | "reactivate"
  | "schedule_deletion"
  | "cancel_deletion";

export async function performLifecycleAction(
  superadminId: string,
  slug: string,
  action: LifecycleAction
): Promise<void> {
  const res = await fetch(`${apiBase()}/admin/tenants/lifecycle`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ superadmin: superadminId, slug, action }),
  });
  await handle<unknown>(res);
}