/*
 * Copyright (C) Sapphirecode - All Rights Reserved
 * This file is part of Auth-Server-Helper which is released under MIT.
 * See file 'LICENSE' for full license details.
 * Created by Timo Hocker <timo@scode.ovh>, August 2022
 */

import IORedis from 'ioredis';
import { debug } from './debug';
import { LabelledKey } from './Key';

const logger = debug ('redis');

export type SyncClass = 'blacklist' | 'keystore'
export type SyncValue = LabelledKey | string;

export class Redis {
  private _redis: IORedis | null = null;

  public connect (url: string): void {
    const log = logger.extend ('connect');
    log ('connecting to redis instance %s', url);
    if (this._redis !== null) {
      log ('disconnecting existing redis client');
      this.disconnect ();
    }

    this._redis = new IORedis (url);
    this._redis.on ('connect', () => {
      log ('connected');
    });
    this._redis.on ('ready', () => {
      log ('ready');
    });
    this._redis.on ('error', (err) => {
      log ('error %o', err);
    });
    this._redis.on ('reconnecting', () => {
      log ('reconnecting');
    });
    this._redis.on ('end', () => {
      log ('connection ended');
    });
  }

  public disconnect (): void {
    const log = logger.extend ('disconnect');
    log ('disconnecting redis client');
    if (this._redis === null) {
      log ('redis is inactive, skipping');
      return;
    }
    this._redis.quit ();
    this._redis = null;
    log ('done');
  }

  public async set (
    sync_class: SyncClass,
    key: string,
    value: SyncValue
  ): Promise<void> {
    const log = logger.extend ('set');
    log ('trying to set %s value %s to redis', sync_class, key);
    if (this._redis === null) {
      log ('redis is inactive, skipping');
      return;
    }
    let valid_for = null;
    if (sync_class === 'keystore') {
      valid_for = Math.floor (
        (key.valid_until - (new Date)
          .getTime ()) / 1000
      );
      log ('key is valid for %d seconds', valid_for);
    }
    if (valid_for === null)
      await this._redis.set (key, JSON.stringify (value));
    else
      await this._redis.setex (key, valid_for, JSON.stringify (value));

    log ('saved value');
  }

  public async get_key (index: string): Promise<LabelledKey | null> {
    const log = logger.extend ('get_key');
    log ('trying to get key %s from redis', index);
    if (this._redis === null) {
      log ('redis is inactive, skipping');
      return null;
    }
    const res = await this._redis.get (index);
    if (res === null) {
      log ('key not found in redis');
      return null;
    }
    log ('key found');
    return JSON.parse (res);
  }
}

export const redis = (new Redis);