D-Net

import {

  Component,

  Inject,

  Input,

  OnDestroy,

  OnInit,

  RendererFactory2,

  ViewEncapsulation

} from '@angular/core';

import {Citation, CitationData} from './citation.class';

import {ResultLandingInfo} from "../../../utils/entities/resultLandingInfo";

import {DOCUMENT} from "@angular/common";

import {EnvProperties} from "../../../utils/properties/env-properties";

import {properties} from "../../../../../environments/environment";

import {PiwikService} from "../../../utils/piwik/piwik.service";

declare var Cite: any;

// Based on https://citation.js.org/api/tutorial-getting_started.html browser release

//<citeThis ></citeThis>

@Component({

  selector: 'citeThis',

  template: `

    <div class="uk-padding">

      <mat-form-field class="matSelectionFormField uk-width-1-1">

        <mat-label>Select a citation style</mat-label>

        <mat-select class="matSelection" id="citations" name="citeselect" [(ngModel)]="selectedStyle"

                    (ngModelChange)="styleChanged()"

                    [disableOptionCentering]="true"

                    panelClass="matSelectionPanel">

          <mat-option *ngFor=" let  style of this.citation.templates let i = index"

                      [value]="style">{{style}}</mat-option>

        </mat-select>

      </mat-form-field>

      <div *ngIf="selectedStyle" class="box-content uk-grid uk-margin-auto ">

        <div id="citation" class="  uk-overflow-auto uk-padding-small" [innerHTML]=citationText></div>

        <div class="uk-width-1-1">

          <button class="clipboard_btn uk-button uk-button-primary uk-button-small copy  uk-icon uk-float-right"

              data-clipboard-target="#citation" title="Copy to clipboard">

            <span class="custom-icon custom-copy-white"></span>

<!--            <span class="uk-margin-small-left">COPY</span>-->

          </button>

        </div>

      </div>

      <div  class="uk-margin-top">

        <mat-form-field class="matSelectionFormField uk-width-1-1">

          <mat-label>Or select file format to download</mat-label>

          <mat-select class="matSelection" id="fileformats" name="fileformatsSelect" [(ngModel)]="selectedFormat"

                      (ngModelChange)="formatChanged()"

                      [disableOptionCentering]="true"

                      panelClass="matSelectionPanel">

            <mat-option *ngFor=" let  format of citation.fileFormats let i = index"

                        [value]="format">{{format + " (" +citation.fileSuffix[i] + ")"}}</mat-option>

          </mat-select>

        </mat-form-field>

        <button  *ngIf="selectedFormat" class="  uk-button uk-button-primary uk-button-small uk-margin-small-top uk-icon uk-float-right"

                title="Copy to clipboard" [disabled]="!selectedFormat" (click)="downloadFile()">

          <span class="custom-icon " uk-icon="download"></span>

          <span class="uk-margin-small-left">Download</span>

        </button>

      </div>

    </div>

  `

})

export class CiteThisComponent implements OnInit, OnDestroy {

  public selectedStyle: string = null;

  public selectedFormat: string = null;

  public fileText: string;

  properties:EnvProperties;

  public citationText: string;

  public citation: Citation = new Citation();

  @Input() result: ResultLandingInfo;

  @Input() id: string;

  @Input() type: string = "article";

  @Input() piwikSiteId;

  public data:CitationData;

  public clipboard;

  timeout;

  cite;citeConfig;

  sub;

  constructor( @Inject(DOCUMENT) private document, private rendererFactory: RendererFactory2, private _piwikService: PiwikService){

}

  ngOnInit() {

    this.properties = properties;

    try{

      if (!this.document.getElementById('citationjs')) {

        const renderer = this.rendererFactory.createRenderer(this.document, {

          id: '-1',

          encapsulation: ViewEncapsulation.None,

          styles: [],

          data: {}

        });

        const head = this.document.head;

        if (head === null) {

          throw new Error('<head> not found within DOCUMENT.');

        }

        const script = renderer.createElement('script');

        renderer.setAttribute(script, "id", "citationjs");

        renderer.setAttribute(script, "src", "assets/common-assets/citation-0.4.0-9.min.js");

        renderer.setAttribute(script, "type", "text/javascript");

        renderer.appendChild(head, script);

        this.timeout = setTimeout(() => {

          const script2 = renderer.createElement('script');

          renderer.setAttribute(script2, "id", "citationjs2");

          renderer.setAttribute(script2, "type", "text/javascript");

          renderer.setProperty(script2,  "text","const Cite = require('citation-js')");

          renderer.appendChild(head, script2);

        }, 500);

      }

  }catch (e) {

    console.error(e)

  }

  }

  ngOnDestroy() {

    delete this.clipboard;

    clearTimeout(this.timeout);

  }

  private initiate(){

    this.citeConfig = Cite.plugins.config.get('csl');

    this.cite = new Cite();

    this.parseData();

    this.createClipboard();

  }

  private createClipboard() {

    if (typeof window !== 'undefined') {

      delete this.clipboard;

      let Clipboard;

      Clipboard = require('clipboard');

      this.clipboard = new Clipboard('.clipboard_btn');

    }

  }

  parseData() {

    var citationData: CitationData = new CitationData();

    if (this.result.identifiers && Array.from(this.result.identifiers.keys()).length > 0) {

      var keys = Array.from(this.result.identifiers.keys());

      for (var i = 0; i < keys.length; i++) {

        if (keys[i] == "doi") {

          var ids = this.result.identifiers.get(keys[i]);

          for (var j = 0; j < ids.length; j++) {

            citationData.DOI = ids[j];

            break;

          }

        }

      }

    }

    citationData.id = this.id;

    citationData.type =  this.mapTypes();

    if (this.result.title) {

      citationData.title = this.result.title;

    }

    if (this.result.publisher) {

      citationData.publisher = this.result.publisher;

    }

    if (this.result.authors) {

      citationData.author = [];

      var max_length = (this.result.authors.length > 10) ? 10 : this.result.authors.length;

      for (var i = 0; i < max_length; i++) {

        if (this.result.authors[i] && this.result.authors[i].fullName && this.result.authors[i].fullName.indexOf(", ") !== -1) {

          citationData.author.push({

            given: this.result.authors[i].fullName.split(", ")[1],

            family: this.result.authors[i].fullName.split(", ")[0],

            'parse-names': true

          });

        } else {

          citationData.author.push({given: "", family: this.result.authors[i].fullName, 'parse-names': true});

        }

        // citationData.authors.push(this.result.authors[i]);

      }

    }

    if (this.result.dateofacceptance != undefined) {

      citationData.issued = {};

      var date: string = (this.result.dateofacceptance.getFullYear()) + ""; // transform to string in case it is an integer

      var dateArray: string[] = (date && (date).indexOf('-') !== -1) ? [date.split('-')[0]] : [date];

      if (dateArray.length < 3) {

        // dateArray.push[1];

        // dateArray.push[1];

      }

      citationData.issued = {"date-parts": [["" + dateArray[0]]]};

      if (this.result.date) {

        citationData.date = this.result.date;

      }

      if (this.result.journal) {

        if (this.result.journal.journal) {

          citationData["container-title"] = this.result.journal.journal;

        }

        if (this.result.journal.issn) {

          citationData.ISSN = this.result.journal.issn;

        }

        if (this.result.journal.issue) {

          citationData.issue = this.result.journal.issue;

        }

        citationData.type = "article-journal"; // in case of APA volume and pages appear only in specific types not just article

        if (this.result.journal.volume) {

          citationData.volume = this.result.journal.volume;

        }

        if (this.result.journal["start_page"] && this.result.journal["end_page"]) {

          citationData.page = this.result.journal["start_page"] + "-" + this.result.journal["end_page"];

        }

      }

    }

    this.data = citationData;

    this.cite.set(this.data);

  }

  private mapTypes(){

    if (this.result.types != undefined && this.result.types.length > 0) {

      if(this.result.types.indexOf("Article") != -1) {

        return "article";

      }else if(this.result.types.indexOf("Conference object") != -1){

        return "paper-conference";

      }else if( this.result.types[0]){

        return this.result.types[0].toLowerCase();

      }

    }

    return "";

  }

  styleChanged() {

    this.citationText  = this.get(this.selectedStyle);

  }

  formatChanged() {

    this.fileText = this.get(this.selectedFormat, false);

  }

  downloadFile(){

    if (typeof document !== 'undefined') {

      var url = window.URL.createObjectURL(new Blob([this.fileText]));

      var a = window.document.createElement('a');

      window.document.body.appendChild(a);

      a.setAttribute('style', 'display: none');

      a.href = url;

      a.download = this.selectedFormat + this.citation.fileSuffix[this.citation.fileFormats.indexOf(this.selectedFormat)];

      a.click();

      window.URL.revokeObjectURL(url);

      a.remove(); // remove the element

      if (this.properties.enablePiwikTrack && (typeof document !== 'undefined')) {

        this.sub = this._piwikService.trackDownload(this.properties, "DownloadCitation"+this.selectedFormat,  this.piwikSiteId).subscribe();

      }

    }

  }

  get(style:string, isBibliography:boolean = true){

    try {

      if (!isBibliography  && style != "bibtex") {

        return this.getFormat(style);

      } else {

        return this.getBibliography(style);

      }

    }catch (e) {

      console.error(e);

      return "";

    }

  }

  /**

   * Supports formats bibtex, bibtxt, ris

   * @param format

   */

  getFormat(format:string) {

    if(!this.cite){

      this.initiate();

    }

    return this.cite.format(format, {

      format: 'text'

    });

  }

  /**

   * Based on this and citeproc library https://citation.js.org/api/tutorial-plugins.html

   * if the template doesn;t exist add the CSL xml and the library will produce the citation

   * @param template

   */

  getBibliography(template:string) {

    if(!this.cite || !this.citeConfig ){

      this.initiate();

    }

    if (!this.citeConfig.templates.get(template)) {

      this.citeConfig.templates.add(template, this.citation[template]);

    }

    return this.cite.format('bibliography', {

      format: 'text',

      template: template,

      lang: 'en-US'

    });

  }

}