import cron, { type ScheduledTask } from 'node-cron'
import { getScanConfig } from './app-settings'
import { runFullScan } from './scanner'

let scheduledTask: ScheduledTask | null = null

export function startScheduler(): void {
  const { schedule, enabled } = getScanConfig()

  if (!enabled) {
    console.log('[scheduler] Scanning is disabled — scheduler not started')
    return
  }

  if (!cron.validate(schedule)) {
    console.error(`[scheduler] Invalid cron expression "${schedule}" — scheduler not started`)
    return
  }

  scheduledTask = cron.schedule(schedule, () => {
    console.log('[scheduler] Cron triggered — running full scan')
    runFullScan().catch((err) => console.error('[scheduler] Scan error:', err))
  })

  console.log(`[scheduler] Started with schedule: ${schedule}`)
}

export function stopScheduler(): void {
  if (scheduledTask) {
    scheduledTask.stop()
    scheduledTask = null
    console.log('[scheduler] Stopped')
  }
}

export function restartScheduler(): void {
  stopScheduler()
  startScheduler()
}