import { Injectable, OnModuleDestroy } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import Redis from 'ioredis';

@Injectable()
export class RedisService implements OnModuleDestroy {
  readonly client: Redis;

  constructor(config: ConfigService) {
    this.client = new Redis({
      host: config.get<string>('REDIS_HOST', 'localhost'),
      port: config.get<number>('REDIS_PORT', 6379),
      password: config.get<string>('REDIS_PASSWORD') || undefined,
      maxRetriesPerRequest: null,
    });
  }

  async getJson<T>(key: string): Promise<T | null> {
    const value = await this.client.get(key);
    return value ? (JSON.parse(value) as T) : null;
  }

  async setJson(key: string, value: unknown, ttlSeconds: number) {
    await this.client.set(key, JSON.stringify(value), 'EX', ttlSeconds);
  }

  async del(...keys: string[]) {
    if (keys.length) await this.client.del(...keys);
  }

  async onModuleDestroy() {
    await this.client.quit();
  }
}