import cron from 'node-cron'
import { newLogger } from '../utils/logger'
import { Logger } from 'tslog'

export abstract class CronJob {
  static tasks: cron.ScheduledTask[] = []
  static {
    process.on('SIGINT', () => {
      for (const task of this.tasks) {
        task.stop()
      }
      process.exit()
    })
  }
  private running = false
  protected name: string
  protected logger: Logger<any>

  protected constructor(name: string) {
    this.name = name
    this.logger = newLogger(name)
  }

  protected abstract run(): Promise<void> | void

  start(cronTime: string) {
    const task = cron.schedule(
      cronTime,
      async () => {
        if (this.running) return
        try {
          this.logger.info(`${this.name} job started.`)
          this.running = true
          await this.run()
        } catch (e) {
          this.logger.error('error occurred running cron job.', e)
        } finally {
          this.running = false
          this.logger.info(`${this.name} job finished.`)
        }
      },
      { runOnInit: true },
    )
    CronJob.tasks.push(task)
  }
}