import { makeAutoObservable, runInAction } from 'mobx';
import { appEvents } from '@/shared/lib';
import { fetchOnDutyDispatchers } from '../api/dispatcherApi';
import { cachedOnDuty } from './onDutyCache';
import type { OnDutyDispatcher } from './types';

const REFRESH_INTERVAL = 60_000;

class OnDutyStore {
  dispatchers: OnDutyDispatcher[] = cachedOnDuty();
  phrase = '';

  private timer: ReturnType<typeof setInterval> | null = null;

  constructor() {
    makeAutoObservable(this, {}, { autoBind: true });
  }

  start(): void {
    if (this.timer) return;
    void this.refresh();
    this.timer = setInterval(() => void this.refresh(), REFRESH_INTERVAL);
    appEvents.on('dispatchers-on-duty-changed', this.applyCache);
  }

  stop(): void {
    if (this.timer) clearInterval(this.timer);
    this.timer = null;
    appEvents.off('dispatchers-on-duty-changed', this.applyCache);
  }

  async refresh(): Promise<void> {
    const { dispatchers, phrase } = await fetchOnDutyDispatchers();
    runInAction(() => {
      if (dispatchers.length > 0) this.dispatchers = dispatchers;
      if (phrase) this.phrase = phrase;
    });
  }

  private applyCache(): void {
    this.dispatchers = cachedOnDuty();
  }
}

export const onDutyStore = new OnDutyStore();