/* eslint-disable consistent-return */
import { createReadStream } from 'fs'
import readline from 'readline'

import { AuthKeys } from '../../types'
import { Response } from './types'

export async function ServerUtils_GetAuthKeys(path: string): Promise<AuthKeys | Response> {
  // Rotate the key
  // Make the key something unique to all services. 
  // the key could be made up of the domain and also the service name, and another key that the company creates as well. 
  // We could make this done on init. Which is then completely encrypted, 
  // Then we can use this across services, so the key will always be the same and also rotated based on the timestamp
  // Each time it's rotated. WAPI will generate a new encyption based on 

  // The goal: 
  // for each service in a cluster to be able to talk to each other, once the person is verified. 
  // It will generate a encrypted JWT that is passed back and forth. 
  // When it rotates every 20 mins, it will remember in memory the last [X] keys, based on the server setup.
  // 
  try {
    const fileStream = createReadStream(path)

    const rl = readline.createInterface({
      input: fileStream,
      crlfDelay: Infinity,
    })
    // Note: we use the crlfDelay option to recognize all instances of CR LF
    const keys: string[] = []
    // eslint-disable-next-line no-restricted-syntax
    for await (const line of rl) {
      keys.push(line)
    }

    return { current: keys[0], previous: keys[1] }
  } catch (err) {
    console.error(err)
    return {
      current: '',
      previous: '',
    }
  }
}