import {Component, ElementRef, HostListener, Input, OnDestroy, OnInit, ViewChild} from "@angular/core";
import {Annotation, AnnotationService} from "./annotation.service";
import {ResultLandingInfo} from "../../utils/entities/resultLandingInfo";
import {EnvProperties} from "../../utils/properties/env-properties";
import {properties} from "../../../../environments/environment";
import {UserManagementService} from "../../services/user-management.service";
import {COOKIE} from "../../login/utils/helper.class";
import {Subscriber} from "rxjs";

@Component({
  selector: 'b2note',
  template: `
    <div class="sideInfoTitle uk-margin-small-bottom">Annotations</div>
    <div class="b2note">
      <form ngNoForm *ngIf="pid && user"
            [action]="properties.b2noteAPIURL + 'widget'"
            method="post"
            target="b2note_iframe"
            class="uk-padding-small uk-padding-remove-vertical">
        <!--URL of the annotated record-->
        <input
            type="hidden"
            name="recordurl_tofeed"
            [value]="url">
        <!--URL of the record contents for downloading-->
        <input
            type="hidden"
            name="subject_tofeed"
            [value]="pid">
        <!--PID of the annotated record-->
        <input
            type="hidden"
            name="pid_tofeed"
            [value]="pid">
        <!--URL of the record contents for downloading-->
        <button class="uk-flex uk-flex-middle uk-button"
                (click)="toggleAnnotation($event)"
                type="submit"
                title="Click to annotate this page using B2Note.">
          <img src="assets/common-assets/b2note.png" width="48" height="24">
          <span>add annotation</span>
        </button>
      </form>
      <div *ngIf="!pid || !user">
        <button class="uk-flex uk-flex-middle disabled"
                [title]="!pid?'Annotations are only available for resources with a PID (persistent identifier) like DOI, handle, PMID':
                'Annotations are only available for logged in users'">
          <img src="assets/common-assets/b2note.png" width="48" height="24">
          <span>add annotation</span>
        </button>
      </div>
      <div *ngIf="loading" class="loading-gif uk-margin-medium-top"></div>
      <ul *ngIf="annotations && !loading" class="uk-list uk-list-divider">
        <li *ngFor="let annotation of annotations.slice(0, visibleAnnotations)" uk-grid
            class="uk-flex uk-flex-top uk-margin-remove-left">
          <div [ngClass]="annotation.type" class="uk-width-auto">{{annotation.type}}</div>
          <div [class.uk-width-1-3]="annotation.urls" [class.uk-width-1-6@s]="annotation.urls">{{annotation.text}}</div>
          <ul class="uk-width-expand uk-list uk-margin-remove-top" *ngIf="annotation.urls">
            <li *ngFor="let url of annotation.urls.slice(0, annotation.urlSize)"><a [href]="url"
                                                                                    target="_blank">{{url}}</a></li>
            <li *ngIf="annotation.urlSize < annotation.urls.length"><a
                (click)="annotation.urlSize = annotation.urls.length">+ {{annotation.urls.length - annotation.urlSize}}
              more</a></li>
          </ul>
        </li>
      </ul>
      <div *ngIf="visibleAnnotations < annotations.length" class="uk-margin-medium-top uk-text-center">
        <button class="uk-button uk-button-primary"
                (click)="visibleAnnotations = (visibleAnnotations + annotationSize)">Load More
        </button>
      </div>
    </div>
    <div [class.uk-hidden]="!visible">
      <div class="widget-container" cdkDrag>
        <!--Close button, should be bound to hide the widget-->
        <button type="button" class="close" aria-label="Close" (click)="toggleAnnotation($event)">
          <span aria-hidden="true">×</span>
        </button>
        <!--The glorious iframe with the running app!-->
        <iframe #iframe id="b2note_iframe" name="b2note_iframe" class="b2note-iframe">
        </iframe>
      </div>
    </div>`,
  styleUrls: ['annotation.css']
})
export class AnnotationComponent implements OnInit, OnDestroy {
  
  @Input()
  public landingInfo: ResultLandingInfo = null;
  @Input()
  public id: string = null;
  public properties: EnvProperties = properties;
  public url: string = null;
  public pid: string = null;
  public keywords: string[] = [];
  public visible: boolean = false;
  public annotations: Annotation[] = [];
  public annotationSize: number = 3;
  public user;
  public visibleAnnotations: number;
  public loading: boolean = false;
  @ViewChild('iframe') iframe: ElementRef;
  private subscriptions: any[] = [];
  
  constructor(private annotationService: AnnotationService,
              private userManagementService: UserManagementService) {
  }
  
  @HostListener('window:message', ['$event'])
  public onChange(event) {
    if (this.properties.b2noteAPIURL.includes(event.origin)) {
      if (event.data === "B2NOTE loaded") {
        let token = COOKIE.getCookie('AccessToken');
        this.iframe.nativeElement.contentWindow.postMessage({token: token}, this.properties.b2noteAPIURL);
      } else {
        this.getAnnotations();
      }
    }
  }
  
  ngOnInit(): void {
    this.subscriptions.push(this.userManagementService.getUserInfo().subscribe(user => {
      this.user = user;
    }));
    this.visibleAnnotations = this.annotationSize;
    if (typeof window !== "undefined") {
      let id = this.id;
      this.url = window.location.href;
      if (this.landingInfo.deletedByInferenceIds) {
        id = this.landingInfo.deletedByInferenceIds[0];
        this.url = this.url.replace(this.id, id);
      }
      if (this.landingInfo.identifiers && this.landingInfo.identifiers.size > 0) {
        if (this.landingInfo.identifiers.get('doi')) {
          this.pid = this.landingInfo.identifiers.get('doi')[0];
        } else {
          const key: string = this.landingInfo.identifiers.keys().next().value;
          if (key) {
            this.pid = this.landingInfo.identifiers.get(key)[0];
          }
        }
      }
      if (this.pid) {
        this.getAnnotations();
      }
    }
  }
  
  private clearSubscriptions() {
    this.subscriptions.forEach(subscription => {
      if (subscription instanceof Subscriber) {
        subscription.unsubscribe();
      }
    });
    this.subscriptions = [];
  }
  
  private getAnnotations() {
    if(!this.annotations || this.annotations.length === 0) {
      this.loading = true;
    }
    this.subscriptions.push(this.annotationService.getAllAnnotations(this.properties, this.pid).subscribe(annotations => {
      this.annotations = annotations;
      this.annotations.forEach(annotation => {
        annotation.urlSize = 3;
      });
      this.loading = false;
    }));
  }
  
  ngOnDestroy(): void {
    this.clearSubscriptions();
  }
  
  public toggleAnnotation(event) {
    if (this.visible) {
      event.preventDefault();
    }
    this.visible = !this.visible;
  }
}