import { Component, OnInit, Output, EventEmitter, Input, OnDestroy } from '@angular/core';
import { Store, select } from '@ngrx/store';

import { Observable, Subscription, of } from 'rxjs';
import { catchError, exhaustMap, map, tap, take } from 'rxjs/operators';

import { AuthSelector } from '@overflow/shared/auth/store';
import { DomainMember } from '@overflow/commons-typescript/model/domain';
import { ProbeHost, Probe } from '@overflow/commons-typescript/model/probe';

import { ProbeHostService } from '../service/probe-host.service';
import { ProbeSubscriber, ProbeNotify } from '../subscriber/probe.subscriber';

@Component({
  selector: 'of-probe-list',
  templateUrl: './probe-list.component.html',
})
export class ProbeListComponent implements OnInit, OnDestroy {
  @Output() select = new EventEmitter<ProbeHost>();

  probeHosts: ProbeHost[];
  pending$: Observable<boolean>;
  error$: Observable<any>;

  probeSubscription: Subscription;

  constructor(
    private store: Store<any>,
    private probeHostService: ProbeHostService,
    private probeSubscriber: ProbeSubscriber,
  ) {
    this.probeSubscription = null;
  }

  ngOnInit(): void {
    this.store.pipe(
      tap(() => {
        this.pending$ = of(true);
      }),
      select(AuthSelector.selectDomainMember),
      exhaustMap((domainMember: DomainMember) =>
      this.probeHostService.readAllByDomainID(domainMember.domain.id)
          .pipe(
            map((probeHosts: ProbeHost[]) => {
              this.probeHosts = probeHosts;
            }),
            catchError(error => {
              this.error$ = of(error);
              return of();
            })
          )
      ),
      tap(() => {
        this.pending$ = of(false);
      }),
      take(1),
    ).subscribe();

    this.probeSubscription = this.probeSubscriber.observable().pipe(
      tap((probeNotify: ProbeNotify) => {
        const probeHosts = [];
        this.probeHosts.forEach(probeHost => {
          const n = probeNotify.params;
          if (probeHost.probe.id === n.id) {
            probeHost.probe = n;
          }
          probeHosts.push(probeHost);
        });

        this.probeHosts = probeHosts;
      }
      ),
    ).subscribe();
  }

  ngOnDestroy(): void {
    if (null !== this.probeSubscription) {
      this.probeSubscription.unsubscribe();
    }
  }

  onProbeSelect(event) {
    this.select.emit(event.data);
  }

  getUptime(probe: Probe) {
    if (!probe.connectDate) {
      return 'Not Connected.';
    }
    return 'TODO';
  }

  convertUptimeString(hours: number) {
    if (hours === 0) {
      return 'Less than an hour.';
    } else {
      return 'About ' + hours;
    }
  }
}