export const adminAppPermissionsStorageKey = 'studio-admin-app-permissions';

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

type PermissionMap = Record<string, 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 getAdminPermissionKey(admin: CurrentAdminLike) {
  return admin.id || admin.email || '';
}

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

export function getAdminAppPermissionMap(): PermissionMap {
  try {
    const raw = window.localStorage.getItem(adminAppPermissionsStorageKey);
    if (!raw) return {};
    const parsed = JSON.parse(raw) as PermissionMap;
    return parsed && typeof parsed === 'object' ? parsed : {};
  } catch {
    return {};
  }
}

export function getAdminAppPermissions(admin: CurrentAdminLike) {
  const key = getAdminPermissionKey(admin);
  const map = getAdminAppPermissionMap();
  if (key && map[key]) return map[key];
  if (admin.id && map[admin.id]) return map[admin.id];
  if (admin.email && map[admin.email]) return map[admin.email];
  return [];
}

export function setAdminAppPermissions(admin: CurrentAdminLike, appIds: string[]) {
  const key = getAdminPermissionKey(admin);
  if (!key) return;

  const nextMap = getAdminAppPermissionMap();
  const nextAppIds = [...new Set(appIds.filter(Boolean))];
  nextMap[key] = nextAppIds;
  if (admin.id) nextMap[admin.id] = nextAppIds;
  if (admin.email) nextMap[admin.email] = nextAppIds;
  window.localStorage.setItem(adminAppPermissionsStorageKey, JSON.stringify(nextMap));
  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));
}