import type { LTILaunchConfig, LTISession } from '@lti-tool/core';
import { LRUCache } from 'lru-cache';

export const LAUNCH_CONFIG_CACHE = new LRUCache<
  string,
  LTILaunchConfig | undefinedLaunchConfig
>({
  max: 1000,
  ttl: 1000 * 60 * 15, // 15 minutes
});
export const SESSION_CACHE = new LRUCache<string, LTISession | undefinedSession>({
  max: 1000,
  ttl: 1000 * 60 * 5, // 5 minutes (shorter than clients)
});

export const SESSION_TTL = 60 * 60 * 24; // session ttl is one day
export const NONCE_TTL = 60 * 15; // nonce ttl is fifteen minutes

// we need an undefined value to handle cache misses and cache them
export const undefinedLaunchConfigValue = Symbol('undefinedLaunchConfig');
export type undefinedLaunchConfig = typeof undefinedLaunchConfigValue;
export const undefinedSessionValue = Symbol('undefinedSession');
export type undefinedSession = typeof undefinedSessionValue;