import {Component, ElementRef, OnInit, ViewChild} from '@angular/core';
import {ActivatedRoute, Router} from '@angular/router';

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

import {Session} from '../../openaireLibrary/login/utils/helper.class';
import {LoginErrorCodes} from '../../openaireLibrary/login/utils/guardHelper.class';
import {CuratorService} from '../../openaireLibrary/connect/curators/curator.service';
import {Affiliation, Curator} from '../../openaireLibrary/utils/entities/CuratorInfo';
import {HelperFunctions} from '../../openaireLibrary/utils/HelperFunctions.class';
import {UtilitiesService} from '../../openaireLibrary/services/utilities.service';

@Component({
  selector: 'curator',
  templateUrl: './curator.component.html',
})

export class CuratorComponent implements OnInit {

  public showLoading = true;
  public updateErrorMessage = '';
  public successfulSaveMessage = '';

  public affiliationsChanged = false;
  public hasChanged = false;
  public curatorId = null;
  public curator: Curator = null;
  public photo: any = null;
  public properties: EnvProperties = null;

  private file: File = null;
  private enabled = true;
  private deletePhoto =false;

  constructor(private element: ElementRef,
              private route: ActivatedRoute,
              private _router: Router,
              private curatorService: CuratorService,
              private utilitiesService: UtilitiesService) {
  }


  ngOnInit() {
    this.route.data.subscribe((data: { envSpecific: EnvProperties }) => {
      this.properties = data.envSpecific;
      if (!Session.isLoggedIn()) {
        this._router.navigate(['/user-info'], {
          queryParams: {'errorCode': LoginErrorCodes.NOT_VALID, 'redirectUrl': this._router.url}
        });
      } else {
        this.showLoading = true;
        this.updateErrorMessage = '';
        this.curatorId = Session.getUser().id;
        this.curatorService.getCurator(this.properties,
          this.properties.adminToolsAPIURL + 'curator/' + this.curatorId).subscribe(
          curator => {
            if (curator) {
              this.curator = curator;
              this.curator.email = Session.getUserEmail();
              if (this.curator.photo && this.curator.photo !== '') {
                this.photo = this.properties.downloadUrl + '/' + this.curator.photo;
              } else {
                this.photo = '../../../assets/common-assets/curator-default.png';
              }
              this.showLoading = false;
              HelperFunctions.scroll();
            } else {
              this.curator = new Curator();
              this.curator._id = this.curatorId;
              this.curator.email = Session.getUserEmail();
              this.curator.name = Session.getUserFullName();
              this.curator.affiliations = [];
              this.curator.bio = '';
              this.curator.photo = null;
              this.photo = '../../../assets/common-assets/curator-default.png';
              this.showLoading = false;
              HelperFunctions.scroll();
            }
          },
          error => {
          }
        );
      }
    });
  }

  public resetForm() {
    if (!Session.isLoggedIn()) {
      this._router.navigate(['/user-info'], {
        queryParams:
          {'errorCode': LoginErrorCodes.NOT_VALID, 'redirectUrl': this._router.url}
      });
    } else {
      if (this.curatorId != null && this.curatorId !== '') {
        this.showLoading = true;
        this.updateErrorMessage = '';
        this.curatorService.getCurator(this.properties,
          this.properties.adminToolsAPIURL + 'curator/' + this.curatorId).subscribe(
          curator => {
            if (curator) {
              this.curator = curator;
              this.curator.email = Session.getUserEmail();
              if (this.curator.photo && this.curator.photo !== '') {
                this.photo = this.properties.downloadUrl + '/' + this.curator.photo;
              } else {
                this.photo = '../../../assets/common-assets/curator-default.png';
              }
              this.showLoading = false;
              HelperFunctions.scroll();
            } else {
              this.curator = new Curator();
              this.curator._id = this.curatorId;
              this.curator.email = Session.getUserEmail();
              this.curator.name = Session.getUserFullName();
              this.curator.affiliations = [];
              this.curator.bio = '';
              this.curator.photo = null;
              this.photo = '../../../assets/common-assets/curator-default.png';
              this.showLoading = false;
              HelperFunctions.scroll();
            }
          },
          error => {
          }
        );
      }
      this.resetChange();
    }
  }

  private change() {
    this.hasChanged = true;
    this.affiliationsChanged = true;
  }

  private resetChange() {
    this.hasChanged = false;
    this.affiliationsChanged = false;
  }

  private resetMessages() {
    this.successfulSaveMessage = '';
    this.updateErrorMessage = '';
  }

  handleUpdateError(message: string, error) {
    this.resetMessages();
    this.updateErrorMessage = message;
    console.log('Server responded: ' + error);

    this.showLoading = false;
  }

  handleSuccessfulSave(message) {
    this.resetMessages();
    this.showLoading = false;
    HelperFunctions.scroll();
    this.successfulSaveMessage = message;
  }

  fileChangeEvent(event) {
    this.showLoading = true;
    if (event.target.files && event.target.files[0]) {
      this.file = event.target.files[0];
      if (this.file.type !== 'image/png' && this.file.type !== 'image/jpeg') {
        this.handleUpdateError('You must choose a photo!', null);
        this.file = null;
      } else {
        this.updateErrorMessage = '';
        const reader = new FileReader();
        reader.readAsDataURL(this.file);
        reader.onload = () => {
          this.photo = reader.result;
          this.showLoading = false;
          HelperFunctions.scroll();
        };
      }
    }
  }


  updateCurator() {
    if (!Session.isLoggedIn()) {
      this._router.navigate(['/user-info'], {
        queryParams:
          {'errorCode': LoginErrorCodes.NOT_VALID, 'redirectUrl': this._router.url}
      });
    } else {
      if ((this.hasChanged || this.affiliationsChanged) && this.curator && this.curator.name && this.curator.name !== '') {
        this.showLoading = true;
        if (this.file) {
          this.utilitiesService.uploadPhoto(this.properties.uploadService + '/' + this.curator._id, this.file).subscribe((res) => {
              if (this.curator.photo && this.curator.photo !== '') {
                this.utilitiesService.deletePhoto(this.properties.deleteUrl + '/' + this.curator.photo).subscribe();
              }
              this.curator.photo = res.filename;
              this.curatorService.updateCurator(this.properties.adminToolsAPIURL + 'curator',
                this.curator).subscribe((curator) => {
                  if (curator) {
                    this.handleSuccessfulSave('Your data has been saved successfully!');
                    this.resetChange();
                  }
                },
                error => {
                  this.handleUpdateError('An error has occurred. Try again later!', error);
                  this.resetChange();
                });
            }, error => {
              this.handleUpdateError('An error has occurred during photo uploading.', error);
            }
          );
        } else {
          if(this.deletePhoto) {
            this.utilitiesService.deletePhoto(this.properties.deleteUrl + '/' + this.curator.photo).subscribe();
            this.curator.photo = '';
          }
          this.curatorService.updateCurator(this.properties.adminToolsAPIURL + 'curator',
            this.curator).subscribe((curator) => {
              if (curator) {
                this.handleSuccessfulSave('Your data has been saved successfully!');
                this.resetChange();
              }
            },
            error => {
              this.handleUpdateError('An error has occurred. Try again later!', error);
              this.resetChange();
            });
          }
        }
      }
  }

  onNameChange() {
    this.hasChanged = true;
    if (!this.curator.name || this.curator.name === '') {
      this.enabled = false;
    } else {
      this.enabled = true;
    }
  }

  removePhoto() {
    this.deletePhoto = true;
    this.hasChanged = true;
    this.photo = '../../../assets/common-assets/curator-default.png';
  }
}