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

import {KanbanService} from "./kanban/shared/kanban.service";
import {Router} from "@angular/router";
import {SelfUpdaterService} from "./kanban/shared/self-updater.service";

const TIMER_DEPLOY_REFRESH = 30000;
const TIMER_JIRA_REFRESH = 60000;
const TIMER_PAGE_SWITCH = 300000;


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

    selfUpdateCheckerTimer: Subscription;
    reloadJiraIssueTimer: Subscription;
    pageSwitchTimer: Subscription;

    constructor(
        private selfUpdaterService: SelfUpdaterService,
        private kanbanService: KanbanService,
        private router: Router
    ) {}

    /**
     * Initialize application timers:
     *  - selfUpdateCheckerTimer is used to see if there is a newer revision deployed on the server
     *  - reloadJiraIssueTimer is used to refresh the status of the jira board
     *  - pageSwitchTimer handles switching back and forth between page views
     *  @todo: pageSwitchTimer
     */
    public ngOnInit() {
        let timer0 = TimerObservable.create(TIMER_DEPLOY_REFRESH, TIMER_JIRA_REFRESH);
        this.selfUpdateCheckerTimer = timer0.subscribe(() => {
            this.selfUpdaterService.checkAndReloadIfNecessary();
        });
        let timer1 = TimerObservable.create(TIMER_JIRA_REFRESH, TIMER_JIRA_REFRESH);
        this.reloadJiraIssueTimer = timer1.subscribe(() => {
            this.kanbanService.reload();
        });
        let timer2 = TimerObservable.create(TIMER_PAGE_SWITCH, TIMER_PAGE_SWITCH);
        this.pageSwitchTimer = timer2.subscribe(() => {
            // navigate to next page
            // this.router.navigate();
            console.log("pageSwitch");
        });
    }

    public ngOnDestroy() {
        this.selfUpdateCheckerTimer.unsubscribe();
        this.reloadJiraIssueTimer.unsubscribe();
        this.pageSwitchTimer.unsubscribe();
    }
}