export type CurrentAdminLike = {
  id?: string;
  email?: string;
  name?: string;
  role?: string;
  appPermissions?: string[];
};

export function readCurrentAdmin(): CurrentAdminLike | null {
  try {
    const raw = window.localStorage.getItem('studio-admin');
    if (!raw) return null;
    const admin = JSON.parse(raw) as CurrentAdminLike;
    return admin?.id || admin?.email ? admin : null;
  } catch {
    return null;
  }
}

export function isOwnerAdmin(admin?: CurrentAdminLike | null) {
  return admin?.role === 'OWNER';
}

export function getAdminAppPermissions(admin: CurrentAdminLike) {
  return Array.isArray(admin.appPermissions) ? admin.appPermissions : [];
}

export function setAdminAppPermissions(admin: CurrentAdminLike, appIds: string[]) {
  const current = readCurrentAdmin();
  if (!current || !admin.id || current.id !== admin.id) return;

  const nextAppIds = [...new Set(appIds.filter(Boolean))];
  window.localStorage.setItem('studio-admin', JSON.stringify({ ...current, appPermissions: nextAppIds }));
  window.dispatchEvent(new CustomEvent('studio-admin-app-permissions-change'));
}

export function grantAppPermissionToCurrentAdmin(appId: string) {
  const admin = readCurrentAdmin();
  if (!admin || isOwnerAdmin(admin)) return;

  setAdminAppPermissions(admin, [...getAdminAppPermissions(admin), appId]);
}

export function filterAppsByCurrentAdmin<T extends { id: string }>(apps: T[]) {
  const admin = readCurrentAdmin();
  if (!admin || isOwnerAdmin(admin)) return apps;

  const allowedAppIds = new Set(getAdminAppPermissions(admin));
  return apps.filter((app) => allowedAppIds.has(app.id));
}