import { Component, OnDestroy, OnInit } from '@angular/core';
import { AuthService } from "./auth/auth.service";
import { Subscription } from "rxjs/Subscription";
import { TimerObservable } from "rxjs/observable/TimerObservable";

import { FaultManagerService } from "./fault-manager/fault-manager.service";

// timers are in milliseconds
const RENEW_TIMER_INITIAL = 300000; // 5min
const RENEW_TIMER_PERIOD = 300000;  // 5min

const FAULT_RELOAD_PERIOD = 5000;

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit, OnDestroy {

    private authRenewTimer: Subscription;
    private faultReloadTimer: Subscription;

    constructor(private authService: AuthService,
                private faultManager: FaultManagerService) {}

    ngOnInit(): void {
        let authRenewObservable = TimerObservable.create(RENEW_TIMER_INITIAL, RENEW_TIMER_PERIOD);
        this.authRenewTimer = authRenewObservable.subscribe(() => {
            if (this.authService.isLoggedIn) {
                this.authService.renew();
            }
        });

        let faultReloadObservable = TimerObservable.create(FAULT_RELOAD_PERIOD, FAULT_RELOAD_PERIOD);
        this.faultReloadTimer = faultReloadObservable.subscribe(() => {
            if (this.authService.isLoggedIn) {
                this.faultManager.list().subscribe(faults => this.faultManager.faults = faults);
            }
        });
    }

    ngOnDestroy(): void {
        this.authRenewTimer.unsubscribe();
        this.faultReloadTimer.unsubscribe();
    }

    get isLoggedIn(): boolean {
        return this.authService.isLoggedIn;
    }
}