/*!
 * Original code by Remix Sofware Inc
 * MIT Licensed, Copyright(c) 2021 Remix software Inc, see LICENSE.remix.md for details
 * 
 * Credits to the Remix team:
 * https://github.com/remix-run/remix/blob/main/packages/remix-server-runtime/cookieStorage.ts
 */

import type { CreateCookieFunction } from "./cookies";
import { isCookie } from "./cookies";
import type { SessionIdStorageStrategy, SessionStorage } from "./sessions";
import { createSession, warnOnceAboutSigningSessionCookie } from "./sessions";

interface CookieSessionStorageOptions {
  /**
   * The Cookie used to store the session data on the client, or options used
   * to automatically create one.
   */
  cookie?: SessionIdStorageStrategy["cookie"];
}

export type CreateCookieSessionStorageFunction = (
  options?: CookieSessionStorageOptions
) => SessionStorage;

/**
 * Creates and returns a SessionStorage object that stores all session data
 * directly in the session cookie itself.
 *
 * This has the advantage that no database or other backend services are
 * needed, and can help to simplify some load-balanced scenarios. However, it
 * also has the limitation that serialized session data may not exceed the
 * browser's maximum cookie size. Trade-offs!
 *
 * @see https://remix.run/api/remix#createcookiesessionstorage
 */
export const createCookieSessionStorageFactory =
  (createCookie: CreateCookieFunction): CreateCookieSessionStorageFunction =>
  ({ cookie: cookieArg } = {}) => {
    let cookie = isCookie(cookieArg)
      ? cookieArg
      : createCookie(cookieArg?.name || "__session", cookieArg);

    warnOnceAboutSigningSessionCookie(cookie);

    return {
      async getSession(cookieHeader, options) {
        return createSession((cookieHeader && (await cookie.parse(cookieHeader, options))) || {});
      },
      async commitSession(session, options) {
        return cookie.serialize(session.data, options);
      },
      async destroySession(_session, options) {
        return cookie.serialize("", {
          ...options,
          expires: new Date(0)
        });
      }
    };
  };