import { OAuthStorageManagerInterface, OAuthTransactionMeta, isTransactionMeta } from '../types';

const MAX_ENTRY_LIFETIME = 30 * 60 * 1000; // 30 minutes

export function pruneSharedStorage<M extends OAuthTransactionMeta>(storageManager: OAuthStorageManagerInterface<M>) {
  const sharedStorage = storageManager.getSharedTansactionStorage();
  const entries = sharedStorage.getStorage();
  Object.keys(entries).forEach(state => {
    const entry = entries[state];
    const age = Date.now() - entry.dateCreated;
    if (age > MAX_ENTRY_LIFETIME) {
      delete entries[state];
    }
  });
  sharedStorage.setStorage(entries);
}

export function saveTransactionToSharedStorage<M extends OAuthTransactionMeta>(
  storageManager: OAuthStorageManagerInterface<M>, state: string, meta: M
) {
  const sharedStorage = storageManager.getSharedTansactionStorage();
  const entries = sharedStorage.getStorage();
  entries[state] = {
    dateCreated: Date.now(),
    transaction: meta
  };
  sharedStorage.setStorage(entries);
}


export function loadTransactionFromSharedStorage<M extends OAuthTransactionMeta>(
  storageManager: OAuthStorageManagerInterface<M>, state: string
) {
  const sharedStorage = storageManager.getSharedTansactionStorage();
  const entries = sharedStorage.getStorage();
  const entry = entries[state];
  if (entry && entry.transaction && isTransactionMeta(entry.transaction)) {
    return entry.transaction;
  }
  return null;
}

export function clearTransactionFromSharedStorage<M extends OAuthTransactionMeta>(
  storageManager: OAuthStorageManagerInterface<M>, state: string
) {
  const sharedStorage = storageManager.getSharedTansactionStorage();
  const entries = sharedStorage.getStorage();
  delete entries[state];
  sharedStorage.setStorage(entries);
}