import {Component, Input, ViewChild} from '@angular/core';
import {Subscriber} from "rxjs";
import {HttpClient, HttpHeaders} from "@angular/common/http";
import {AbstractControl, ValidatorFn, Validators} from "@angular/forms";
import {Location} from '@angular/common';
import {COOKIE} from "../../login/utils/helper.class";
import {Router} from "@angular/router";
import {properties} from "../../../../environments/environment";
declare var UIkit;

@Component({
  selector: 'egi-transfer-data',
  template: `
      <a (click)="open()"
         [title]="'Send data to cloud storage [demo]'"
         [attr.uk-tooltip]="'pos: right; cls: uk-active landing-action-tooltip landing-action-tooltip-portal uk-text-small uk-padding-small'"
      > <span icon="cloud-upload"></span>
          <span class="uk-icon-button uk-icon landing-action-button landing-action-button-portal">
                     <span uk-icon="cloud-upload"></span>
                  </span>
      </a>


      <!-- This is the modal -->
      <modal-alert #egiTransferModal large="true" >
        <div *ngIf="!accessToken" class="">
          <div class="uk-width-1-1 uk-margin-top uk-margin-bottom uk-text-center">
            In order to send data to a Cloud Storage, you would need to be authenticated, please login via EGI check-in.
          </div>
          <div class="uk-text-center">
            <button *ngIf="!accessToken" class="uk-button uk-button-default" (click)="checkin()">Login
            </button>
          </div>
        </div>
        <div *ngIf="accessToken" class="">
          <div class="uk-width-1-1 uk-margin-top uk-margin-bottom uk-text-center">
            You have requested to send the data corresponding to the DOI <a [href]="selectedSourceUrl" target="_blank">{{selectedSourceUrl.split(doiPrefix)[1]}}</a> to a cloud storage using the EOSC Data Transfer service
          </div>
          <div class="uk-grid uk-child-width-1-2 uk-grid-divider">
            <div class="uk-first-column">
              <p class="uk-text-meta uk-text-xsmall uk-margin-remove-bottom uk-margin-top">Available Zenodo DOI URLs:</p>
              <div input type="select" [(value)]="selectedSourceUrl" placeholder="Zenodo DOI URL" hint="Select..."
                   [options]="sourceUrls" (valueChange)="this.parse()"></div>
              <div *ngIf="status!='loading'" class="uk-margin-top">
                <div>{{this.downloadElements.length}} files found:</div>
                <div class="uk-overflow-auto" style="max-height: 135px">
                  <ul>
                    <li *ngFor=" let element of this.downloadElements">{{ element.name}}
                    </li>
                  </ul>
                </div>
                <div *ngIf="!this.downloadElements || this.downloadElements.length == 0"> - </div>
              </div>
            </div>
            <div>
              <p class="uk-text-meta uk-text-xsmall uk-margin-remove-bottom uk-margin-top">Please select the Destination Storage type and provide the corresponding storage destination path.</p>
              <div input type="select" [(value)]="selectedDestination" placeholder="Destination Storage" hint="Select..."
                   [options]="destinationOptions"></div>
              <div input [(value)]="destinationPath" placeholder="Give a destination path..."
                   [validators]="validators" class="uk-margin-top"></div>
              <button (click)="transfer()"
                      class="uk-button uk-button-primary uk-margin-top"
                      [class.uk-disabled]="destinationPath.length == 0 || status == 'success' ||status == 'loading' || !validatePath() ">
                >> Transfer
              </button>
            </div>
          </div>
          <div *ngIf="status == 'loading'" class="uk-flex uk-flex-center uk-text-muted">
            <div>
                        <span class="uk-icon uk-spinner">
                        <svg width="60" height="60" viewBox="0 0 30 30" xmlns="http://www.w3.org/2000/svg"
                             data-svg="spinner"><circle
                          fill="none" stroke="#000" cx="15" cy="15" r="14" style="stroke-width: 2px;"></circle></svg>
                        </span>
            </div>
          </div>
          <div *ngIf="message" class="uk-width-1-1 uk-alert"
               [class.uk-alert-success]="status && status.indexOf('error')==-1"
               [class.uk-alert-error]="status && status.indexOf('error')!=-1"
               [innerHTML]="message">
          </div>

          <div class="uk-width-1-1 uk-text-right "
               [class.uk-invisible]="!(status == 'success' || status.indexOf('error')!=-1)">
            <button class="uk-button uk-button-default uk-margin-top " (click)="close()">Close</button>
          </div>
        </div>
      </modal-alert>

  `
})
export class EGIDataTransferComponent {
  subscriptions = [];
  accessToken =  null;
  @Input() dois;
  loginURL = properties.environment == "development"? "http://rudie.di.uoa.gr:8580/openid_connect_login":"https://explore.eosc-portal.eu/egi-login-service/openid_connect_login"
  sourceUrls = []
  selectedSourceUrl = null;
  destinationPath = "";
  destinationOptions = [{label: "EGI dCache (dcache-demo.desy.de)", value: { url: "https://dcache-demo.desy.de:2443", id: "dcache" , webpage:"https://dcache-demo.desy.de"} }];
  selectedDestination = null;

  downloadElements = null;
  @Input() isOpen = false;
  @ViewChild('egiTransferModal') egiTransferModal;
  APIURL = "https://eosc-data-transfer.vm.fedcloud.eu"
    // APIURL = "https://virtserver.swaggerhub.com/thebe14/eosc-future-data-transfer/1.0.0";
  status: "loading" | "success" | "errorParser" | "errorUser" | "errorTransfer" | "init" = "init";
  message;
  doiPrefix = properties.doiURL;
  validators = [Validators.required, this.pathValidator() /*StringUtils.urlValidator()*/];
  constructor(private http: HttpClient, private location: Location,  private _router: Router) {

  }

  ngAfterViewInit() {
    if(this.isOpen){
      this.open();
    }
  }

  ngOnDestroy() {
    this.subscriptions.forEach(subscription => {
      if (subscription instanceof Subscriber) {
        subscription.unsubscribe();
      }
    });

  }
  open(){
    this.accessToken = COOKIE.getCookie("EGIAccessToken");
    if(this.accessToken) {
      for (let doi of this.dois) {
        if (doi.indexOf("zenodo.") != -1) {
          this.sourceUrls.push(this.doiPrefix + doi);
        }
      }
      try {
        this.sourceUrls.sort(function (a, b) {
          return Number(b.split("zenodo.")[1]) - Number(a.split("zenodo.")[1]);
        });
      }catch (e){}

      this.selectedSourceUrl = this.sourceUrls[0];
      this.selectedDestination = this.destinationOptions[0].value;
      this.parse();
    }
    this.isOpen = true;
    this.egiTransferModal.cancelButton = false;
    this.egiTransferModal.okButton = false;
    this.egiTransferModal.alertTitle = "EOSC data transfer service [demo]";
    this.destinationPath = "";
    this.selectedDestination = this.destinationOptions[0].value;
    this.selectedSourceUrl = this.sourceUrls[0];
    this.message = null;
    this.status = "init";
    this.egiTransferModal.open();
  }
  close(){
    if(this.isOpen) {
      this.isOpen = false;
      this.egiTransferModal.cancel();
    }
    // this.downloadElements = [];
    this.destinationPath = "";
    this.selectedDestination = this.destinationOptions[0].value;
    this.selectedSourceUrl = this.sourceUrls[0];
    this.message = null;
    this.status = "init";
    if(this._router.url.indexOf("&egiTransfer")){
      this.location.go(this._router.url.split("&egiTransfer")[0]);
    }
    
  }
  checkin(){
    window.location.href = this.loginURL+"?redirect="+ encodeURIComponent(window.location.href + (window.location.href.indexOf("&egiTransfer=t")!=-1?"":"&egiTransfer=t"));

  }
  parse(){
    this.status = "loading";
    this.message = null;
    this.downloadElements = [];
        this.subscriptions.push(this.http.get(this.APIURL + "/parser/zenodo?doi=" + encodeURIComponent(this.selectedSourceUrl)).subscribe(
          res => {
              this.downloadElements= res['elements']
            // console.log(this.downloadElements)
            this.status = "init";
          }, error => {
            this.status = "errorParser";
            this.message = "Couldn't get download URLs from zenodo";
            UIkit.notification("Couldn't get download URLs from zenodo", {
              status: 'error',
              timeout: 3000,
              pos: 'bottom-right'
            });

          }
        ));

  }

  transfer() {
    // console.log(this.selectedDestination)
  this.status = "loading";
  let headers = new HttpHeaders({'Authorization': 'Bearer '+this.accessToken});
  this.subscriptions.push(this.http.get(this.APIURL + "/user/info", {headers: headers}).subscribe(
    res => {
      // console.log(res)
    let body = {
      "files": [],
      "params": {
        "priority": 0,
        "overwrite": true,
        "retry": 3
      }
    };

      // console.log(this.selectedDestination)
    for (let element of this.downloadElements) {

     let file = {
        "sources": [element['downloadUrl']],
        "destinations": [this.selectedDestination.url + this.destinationPath + element.name],

      };
     //TODO priority? checksum? filesize?
     //  "filesize": element['size']
     body.files.push(file);
    }

    let headers = new HttpHeaders({'Authorization': 'Bearer '+this.accessToken});
    this.subscriptions.push(this.http.post(this.APIURL + "/transfer" ,body, {headers: headers}).subscribe(
      res => {
        // console.log(res)
        UIkit.notification('Data transfer has began! ', {
          status: 'success',
          timeout: 6000,
          pos: 'bottom-right'
        });

        this.status = "success"
        this.message = `
            <div class="uk-text-large uk-margin-bottom">Data transfer has began!</div>
            <div>Transfering ` + this.downloadElements.length + ` files to <a href="`+ this.selectedDestination.webpage + `" target=_blank> EGI Storage</a>:
            <div class=" uk-overflow-auto uk-height-xsmall" > 
            <ul>           
`;
        // TODO LATER we can call status for each file and see if the transfer has been complete
        for(let element of this.downloadElements){
          // console.log(element)
          // this.message += ` <li> <a href="`+ this.selectedDestination.webpage + this.destinationPath + element.name + `" target="_blank">`+ element.name+ `</a></li>  `;
          this.message += ` <li>`+ element.name+ `</li>  `;
        }
        this.message += `
        </ul>  
        </div>
          </div>`

      }, error => {
        this.status = "errorTransfer";
        this.message = "Couldn't transfer files";
        UIkit.notification("Couldn't transfer files", {
          status: 'error',
          timeout: 6000,
          pos: 'bottom-right'
        });

      }
    ));
    }, error => {
      this.status = "errorUser";
      this.message = "User can't be authenticated!";
      UIkit.notification("User can't be authenticated!", {
        status: 'error',
        timeout: 6000,
        pos: 'bottom-right'
      });

    }
  ));
  }
  private parseFilename(url){
    let filename = url.split("/")[url.split("/").length - 1];
    return filename.split("?")[0];
  }
  pathValidator(): ValidatorFn {
    return (control: AbstractControl): { [key: string]: string } | null => {
      if (!this.validatePath()) {
        return {'error': 'Path should start and end with "/"   e.g /path/'};
      }
      return null;
    }
  }
  validatePath():boolean {
      let exp1 = /^\/([A-z0-9-_+]+\/)*$/g;
      return (this.destinationPath.length > 0  && this.destinationPath.match(exp1) != null) 
    
  }
}