import {Component, OnDestroy, OnInit} from '@angular/core';
import {Subscription} from "rxjs";
import {FormControl, FormGroup} from "@angular/forms";
import {debounceTime, distinctUntilChanged, map} from "rxjs/operators";
import {JobsService} from "../services/jobs.service";
import {Job, JobQueue, JobSpec} from "../model/job";
import {ActivatedRoute} from "@angular/router";
import {AlertService} from "../services/alert.service";
import {FiltersService} from "../services/filters.service";
import {Setting} from "../model/setting";
import {SettingsService} from "../services/settings.service";
import {Epoch} from "../model/epoch";
import {faFastBackward, faFastForward, faStepBackward, faStepForward} from "@fortawesome/free-solid-svg-icons";

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

  public epochs: Array<Epoch>;
  public queues: Array<JobQueue>;
  public statuses: Array<string>;
  public jobs$: Subscription;
  public jobs: Array<JobSpec>;
  public pattern: string = "";

  public resultsPerPage: number = 100;
  public currentPage: number = 1;
  public numResults: number = 0;
  public pages: number = 1;
  private pages$: Subscription;

  private readonly settings$: Subscription;
  public canDeleteJobs = false;

  private filters$: Subscription;
  public filters: object;
  public sortColumns: Array<string>;
  public sortDirections: Array<string>;

  public formGroup: FormGroup;

  public faFastBackward = faFastBackward;
  public faStepBackward = faStepBackward;
  public faFastForward = faFastForward;
  public faStepForward = faStepForward;

  constructor(
    private jobService: JobsService,
    private route: ActivatedRoute,
    private alertService: AlertService,
    private filterService: FiltersService,
    private settingsService: SettingsService
  ) {
    this.epochs = this.filterService.getFilter('EPOCH');
    this.queues = this.filterService.getFilter('JOB_QUEUE');
    this.statuses = this.filterService.getFilter('JOB_STATUS');
    this.settings$ = this.settingsService.getSettings().subscribe((s: Setting) => {
      if (s) {
        this.canDeleteJobs = s.allowJobDeletion;
      } else {
        this.canDeleteJobs = false;
      }
    }, error => {
      this.canDeleteJobs = false;
    });
    this.sortColumns = this.filterService.getFilter('JOBSPEC_SORT');
    this.sortDirections = this.filterService.getFilter('SORT_DIRECTION');
  }

  ngOnInit() {
    this.formGroup = new FormGroup({
      pattern: new FormControl()
    });

    this.route.queryParams.subscribe(params => {
      if (params.hasOwnProperty('pattern')) {
        this.pattern = params.pattern;
        this.formGroup.get('pattern').setValue(params.pattern);
      }
      if (params.hasOwnProperty('status')) {
        this.filterService.setCurrentSetting('JOB_STATUS', params.status);
      }
      if (params.hasOwnProperty('queue')) {
        const paramQueue = Job.getQueueFromName(params.queue);
        if (paramQueue) {
          this.filterService.setCurrentSetting('JOB_QUEUE', paramQueue);
        }
      }
      if (params.hasOwnProperty('epoch')) {
        const paramEpoch = Epoch.getEpochFromId(params.epoch);
        if (paramEpoch) {
          this.filterService.setCurrentSetting('EPOCHS', paramEpoch);
        }
      }
    });

    this.formGroup.get('pattern').valueChanges.pipe(
      debounceTime(400),
      distinctUntilChanged(),
      map(results => results)
    ).subscribe((val: string) => {
      this.pattern = val;
      this.getPageInfoAndJobSpec();
    });

    this.filters$ = this.filterService.currentSettings$.subscribe((filters: object) => {
      this.filters = filters;
      this.getPageInfoAndJobSpec();
    });
    this.getPageInfoAndJobSpec();
  }

  setEpoch(epoch: Epoch) {
    this.filterService.setCurrentSetting('EPOCH', epoch);
  }

  setQueue(queue: JobQueue): void {
    this.filterService.setCurrentSetting('JOB_QUEUE', queue);
  }

  setStatus(status: string): void {
    this.filterService.setCurrentSetting('JOB_STATUS', status);
  }

  setSortColumn(column: string): void {
    this.filterService.setCurrentSetting('JOBSPEC_SORT', column);
  }

  setSortDirection(direction: string): void {
    this.filterService.setCurrentSetting('SORT_DIRECTION', direction);
  }

  getPrettyName(name: string): string {
    return FiltersService.prettyName(name);
  }

  goToPage(page: number): boolean {
    if (page < 1) {
      page = 1;
    }
    if (page > this.pages) {
      page = this.pages;
    }
    if (this.currentPage == page) {
      return false;
    }
    this.currentPage = page;
    this.getJobSpecs();
  }

  getPages(): Array<any> {
    return new Array(this.pages);
  }

  getPageCount(): void {
    const epoch = this.filterService.getCurrentSetting('EPOCH');
    const queue = this.filterService.getCurrentSetting('JOB_QUEUE');
    const status = this.filterService.getCurrentSetting('JOB_STATUS');
    this.pages$ = this.jobService.getJobSpecRecordCount(epoch.id, queue.name, this.pattern, status).subscribe((jobSpecNumber: number) => {
      this.numResults = jobSpecNumber;
      this.pages = Math.ceil(jobSpecNumber / this.resultsPerPage);
      console.log('num', jobSpecNumber);
      if (this.currentPage > this.pages) {
        this.currentPage = this.pages;
      }
      if (this.currentPage < 1) {
        this.currentPage = 1;
      }
      this.getJobSpecs();
    });
  }

  getJobSpecs(): void {
    // clear a previous call
    if (this.jobs$) {
      this.jobs$.unsubscribe();
    }
    this.jobs = null;
    const epoch = this.filterService.getCurrentSetting('EPOCH');
    const queue = this.filterService.getCurrentSetting('JOB_QUEUE');
    const status = this.filterService.getCurrentSetting('JOB_STATUS');
    this.alertService.info('Getting ' + queue.label);
    this.jobs$ = this.jobService.getJobSpecPage(epoch.id, queue.name, this.currentPage - 1, this.pattern, status).subscribe((jobSpecs: Array<JobSpec>) => {
      if (jobSpecs && jobSpecs.length > 0) {
        this.alertService.success(queue.label + ' loaded.');
        this.jobs = jobSpecs;
      } else {
        this.jobs = [];
        this.alertService.error('No ' + queue.label + ' found.')
      }
    });
  }

  getJobSpecById(id: number): void {
    // clear a previous call
    if (this.jobs$) {
      this.jobs$.unsubscribe();
    }
    this.jobs$ = this.jobService.getJobSpecById(id).subscribe((jobSpec: JobSpec) => {
      this.jobs = [jobSpec];
      this.numResults = 1;
      this.pages = 1;
      this.currentPage = 1;
    });
  }

  getPageInfoAndJobSpec(): void {
    let possible_id = parseInt(this.pattern);
    if (isNaN(possible_id)) {
      this.getPageCount();
      this.getJobSpecs();
    } else {
      this.getJobSpecById(possible_id);
    }
  }

  /*
  getJobs(): void {
    if (this.jobs$) {
      this.jobs$.unsubscribe();
    }
    this.jobs = null;
    var possibleId = parseInt(this.pattern);
    var id = null;
    if (!isNaN(possibleId)) {
      id = possibleId;
    }
    const queue = this.filterService.getCurrentSetting('JOB_QUEUE');
    const status = this.filterService.getCurrentSetting('JOB_STATUS');
    this.alertService.info('Getting ' + queue.label + ' Jobs');
    if (!!id) {
      this.jobs$ = this.jobService.getJobSpec(id).subscribe((j: JobSpec) => {
        this.alertService.success(queue.label + ' jobs retrieved');
        const arr = [];
        arr.push(this.jobService.jobSpecToJob(j));
        this.jobs = arr;
      });
    } else {
      this.jobs$ = this.jobService.getJobSpecs(queue.name, id, this.pattern, status).subscribe((j: Array<Job>) => {
        if (j && j.length > 0) {
          this.alertService.success(queue.label + ' jobs retrieved');
          this.jobs = j;
        } else {
          this.jobs = [];
          this.alertService.error('No ' + queue.label + ' jobs found');
        }
      });
    }
  }
   */

  ngOnDestroy(): void {
    if (this.jobs$) {
      this.jobs$.unsubscribe();
    }
    if (this.filters$) {
      this.filters$.unsubscribe();
    }
    if (this.settings$) {
      this.settings$.unsubscribe();
    }
    if (this.pages$) {
      this.pages$.unsubscribe();
    }
  }

}