import {Component, Input, Output, EventEmitter} from '@angular/core';
import {ActivatedRoute} from '@angular/router';
import{EnvProperties} from './properties/env-properties';
import {properties} from "../../../environments/environment";

//Usage Example <paging [currentPage]="page" [totalResults]="resultsNum"    [term]="keyword"> </paging>

@Component({
  selector: 'paging-no-load',
  template: `
   <ul disabled  *ngIf=" ( getTotalPages() > 0 ) && (getTotalPages() > 1) && ( 0 < currentPage &&  currentPage <= getTotalPages() ) " [ngClass]="customClasses"
       class="uk-pagination uk-flex uk-flex-middle ">

   <li [class.uk-invisible]="currentPage <= 1" ><a (click)="onPage((currentPage -1))" aria-label="Previous">
       <span><span class="uk-icon"><svg width="20" height="20" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg" icon="chevron-left" ratio="1"><polyline fill="none" stroke="#000" stroke-width="1.03" points="13 16 7 10 13 4"></polyline></svg></span></span></a></li>
   <li *ngIf=" currentPage -2 > 0"><a (click)="onPage((currentPage -2))">{{(currentPage -2) | number}}</a></li>
   <li *ngIf=" currentPage -1 > 0 "><a (click)="onPage((currentPage -1))">{{(currentPage -1) | number}}</a></li>
   <li class="uk-active"><span >{{currentPage | number}}</span></li>
   <li *ngIf=" currentPage +1 <= getTotalPages() "><a (click)="onPage((currentPage +1))">{{(currentPage +1) | number}}</a></li>
   <li *ngIf=" currentPage +2 <= getTotalPages() "><a (click)="onPage((currentPage +2))">{{(currentPage +2) | number}}</a></li>
   <li *ngIf=" (currentPage -2 <= 0)&&(currentPage +3 <= getTotalPages()) " class="uk-visible@l"><a (click)="onPage((currentPage +3))">{{(currentPage +3) | number}}</a></li>
   <li *ngIf=" (currentPage -1 <= 0)&&(currentPage +4 <= getTotalPages()) " class="uk-visible@l"><a (click)="onPage((currentPage +4))">{{(currentPage +4) | number}}</a></li>
   <li [class.uk-invisible]="getTotalPages() <= currentPage">
     <a (click)="onPage(currentPage +1)" aria-label="Next">
       <span class="uk-icon">
        <svg width="20" height="20" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg" icon="chevron-right" ratio="1"><polyline fill="none" stroke="#000" stroke-width="1.03" points="7 4 13 10 7 16"></polyline></svg>
       </span>
     </a>
  </li>


 </ul>

  `
})

export class pagingFormatterNoLoad {
  @Input() public currentPage: number = 1;
  @Input() public customClasses: string = 'uk-flex-center';
  // @Input() public navigateTo: string;
  @Input() public term: string='';
  @Input() public size: number=10;
  @Input() public totalResults: number = 10;
  @Input() public limitPaging: boolean = false;

  // @Input() public params;

  @Output() pageChange  = new EventEmitter();

  private limit: number;
  properties:EnvProperties;
  @Input()
  public loading:boolean = false;

  constructor (private route: ActivatedRoute) {
   }

  ngOnInit() {
      //console.info("In paging -- CurrentPage:"+this.currentPage+" "+"total Pages = "+this.getTotalPages()  +" Results num:"+this.totalResults);

     this.properties = properties;
     this.limit = this.properties.pagingLimit;

  }
  getTotalPages(){
    let total: number = 0;
    //let limit: number = 20;//OpenaireProperties.getPagingLimit();

    var i= this.totalResults/this.size;
    var integerI=parseInt(''+i);
    total = parseInt(''+((i==integerI)?i:i+1));

    if(this.limitPaging) {
      if((this.currentPage == this.limit) && (total > this.limit)) {
        total = this.limit;
      } else if((this.currentPage > this.limit) && (total > this.limit)) {
        total = this.currentPage;
      }
    }
    return total;
  }
  onPrev(){
    this.currentPage=this.currentPage-1;
    this.pageChange.emit({
     value: this.currentPage
   });

  }

  onNext(){

    this.currentPage=this.currentPage+1;
    this.pageChange.emit({
     value: this.currentPage
   });
  }
  onPage(pageNum: number){
    if(!this.loading) {
      this.currentPage = pageNum;
      this.pageChange.emit({
        value: this.currentPage
      });
    }
  }
}