import { promisify } from 'util'

import { OnModuleInit, Injectable } from '@nestjs/common'
import { debug, Debugger } from 'debug'
import { createClient, RedisClient } from 'redis'

@Injectable()
export class RedisService implements OnModuleInit {
  private _debug: Debugger = debug('services').extend('redis')
  private _client: RedisClient

  private get isActive(): boolean {
    return globalThis.secret.redis.enable
  }

  onModuleInit(): void {
    this._client = createClient({
      url: globalThis.secret.redis.url,
    })
    this._client.on('error', error => this._debug(error.message))
  }

  async set(key: string, value: string): Promise<void> {
    if (!this.isActive) return

    const setAsync = promisify(this._client.set).bind(this._client)

    return setAsync(key, value)
  }

  async get(key: string): Promise<any> {
    if (!this.isActive) return

    const getAsync = promisify(this._client.get).bind(this._client)

    return getAsync(key)
  }
}