import {Component, EventEmitter, Input, OnInit, Output, ViewChild} from '@angular/core';
import {ActivatedRoute, Router} from "@angular/router";
import {Subscriber} from 'rxjs';

import {ErrorCodes} from '../../openaireLibrary/utils/properties/errorCodes';
import {SearchUtilsClass} from '../../openaireLibrary/searchPages/searchUtils/searchUtils.class';
import {EnvProperties} from '../../openaireLibrary/utils/properties/env-properties';
import {ManageCommunityProjectsService} from '../../services/manageProjects.service';
import {SearchCommunityProjectsService} from '../../openaireLibrary/connect/projects/searchProjects.service';
import {RouterHelper} from '../../openaireLibrary/utils/routerHelper.class';
import {FormArray, FormBuilder, FormGroup} from "@angular/forms";
import {properties} from "../../../environments/environment";
import {CommunityService} from "../../openaireLibrary/connect/community/community.service";
import {Option} from "../../openaireLibrary/sharedComponents/input/input.component";
import {SearchInputComponent} from "../../openaireLibrary/sharedComponents/search-input/search-input.component";
import {DropdownFilterComponent} from "../../openaireLibrary/utils/dropdown-filter/dropdown-filter.component";
import {OpenaireEntities} from "../../openaireLibrary/utils/properties/searchFields";
import {CommunityInfo} from "../../openaireLibrary/connect/community/communityInfo";
import {HelperFunctions} from "../../openaireLibrary/utils/HelperFunctions.class";
import {NotificationHandler} from "../../openaireLibrary/utils/notification-handler";
import {ClearCacheService} from "../../openaireLibrary/services/clear-cache.service";

@Component({
  selector: 'remove-projects',
  templateUrl: './remove-projects.component.html'
})
export class RemoveProjectsComponent implements OnInit {
  @Input() public community: CommunityInfo;
  @Input() public loading: boolean = true;
  @Output() addProjects: EventEmitter<void> = new EventEmitter();

  private subscriptions: any[] = [];

  public routerHelper: RouterHelper = new RouterHelper();
  public projectUrl = "https://" + ((properties.environment == "beta" || properties.environment == "development") ? "beta." : "") + "explore.openaire.eu" + properties.searchLinkToProject.split("?")[0];

  @Output() communityProjectsChanged = new EventEmitter();
  @Input() public communityProjects = [];
  public previewCommunityProjects = [];
  public communitySearchUtils: SearchUtilsClass = new SearchUtilsClass();
  public errorCodes: ErrorCodes;
  properties: EnvProperties = properties;

  private selectedCommunityProject: any;
  @ViewChild('AlertModalDeleteCommunity') alertModalDeleteCommunity;

  /* Paging */
  page: number = 1;
  resultsPerPage: number = properties.resultsPerPage;

  /* Search */
  @ViewChild('searchInputComponent') searchInputComponent: SearchInputComponent;
  filterForm: FormGroup;
  public fundersCtrl: FormArray;
  private searchText: RegExp = new RegExp('');
  public keyword: string = '';
  selectedFunders: string[] = [];
  allOptions: Option[] = [];
  sortOptions: Option[] = [
    //{label:"Title (desc) ", value:{ sort: "title",descending: true }},
    {label: "Title ", value: {sort: "title", descending: false}},
    //{label:"Grant ID (desc) ", value:{ sort: "grant",descending: true }},
    {label: "Grant ID ", value: {sort: "grant", descending: false}},
    //{label:"Funder (desc) ", value:{ sort: "funder",descending: true }},
    {label: "Funder ", value: {sort: "funder", descending: false}}
  ];

  public openaireEntiites = OpenaireEntities;

  constructor(private route: ActivatedRoute, private _router: Router,
              private _fb: FormBuilder,
              private communityService: CommunityService,
              private _manageCommunityProjectsService: ManageCommunityProjectsService,
              private _searchCommunityProjectsService: SearchCommunityProjectsService,
              private _clearCacheService: ClearCacheService) {
    this.errorCodes = new ErrorCodes();
    this.communitySearchUtils.status = this.errorCodes.LOADING;
  }

  ngOnInit() {
    this.communitySearchUtils.keyword = "";

    this.fundersCtrl = this._fb.array([]);
    this.filterForm = this._fb.group({
      keyword: [''],
      funder: this.fundersCtrl,
      sort: this._fb.control(this.sortOptions[0].value)
    });

    this.subscriptions.push(this.filterForm.get('keyword').valueChanges.subscribe(value => {
      this.searchText = new RegExp(value, 'i');
      this.page = 1;
      this.applyFilters();
    }));

    this.subscriptions.push(this.filterForm.get('funder').valueChanges.subscribe(value => {
      this.page = 1;
      this.applyFilters();
    }));

    this.subscriptions.push(this.filterForm.get('sort').valueChanges.subscribe(value => {
      this.page = 1;
      this.sort();
    }));

    this.subscriptions.push(this.communityService.getCommunityAsObservable().subscribe(community => {
      if (community) {
        this.community = community;
        this.projectUrl = "https://"
          + ((this.properties.environment == "beta" || this.properties.environment == "development") ? "beta." : "")
          + this.community.communityId + ".openaire.eu" + this.properties.searchLinkToProject.split("?")[0];

        this.keyword = '';
        this._getCommunityProjects();
      }
    }));
  }

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

  totalPages(): number {
    let totalPages: any = this.communitySearchUtils.totalResults / (this.resultsPerPage);
    if (!(Number.isInteger(totalPages))) {
      totalPages = (parseInt(totalPages, 10) + 1);
    }
    return totalPages;
  }

  public confirmedDeleteProject(data: any) {
    this.subscriptions.push(this._manageCommunityProjectsService.removeProject(this.properties, this.community.communityId, this.selectedCommunityProject.id).subscribe(
      data => {
        let index = this.communityProjects.indexOf(this.selectedCommunityProject);
        this.communityProjects.splice(index, 1);
        this.applyFilters();
        this._clearCacheService.purgeBrowserCache(this.openaireEntiites.PROJECT+" removed", this.community.communityId);
        NotificationHandler.rise(OpenaireEntities.PROJECT+' successfully removed!');
        this.communityProjectsChanged.emit({
          value: this.communityProjects,
        });
        this.communitySearchUtils.totalResults--;
        this.communitySearchUtils.page = 1;
      },
      err => {
        this.handleError('An error has been occurred. Try again later!');
        console.error(err);
      }
    ));
  }

  public removeProject(communityProject: any) {
    this.selectedCommunityProject = communityProject;
    this.alertModalDeleteCommunity.cancelButton = true;
    this.alertModalDeleteCommunity.okButton = true;
    this.alertModalDeleteCommunity.alertTitle = "Remove "+OpenaireEntities.PROJECT;
    let title = "";
    if (communityProject.name) {
      title = communityProject.name;
    }
    if (communityProject.name && communityProject.acronym) {
      title += " (";
    }
    if (communityProject.acronym) {
      title += communityProject.acronym;
    }
    if (communityProject.name && communityProject.acronym) {
      title += ")";
    }
    this.alertModalDeleteCommunity.message = OpenaireEntities.PROJECT;
    if (title) {
      this.alertModalDeleteCommunity.message += " <b>" + title + "</b> ";
    }
    this.alertModalDeleteCommunity.message += "will be removed from your "+OpenaireEntities.COMMUNITY.toLowerCase()+". Are you sure?";
    this.alertModalDeleteCommunity.okButtonText = "Yes";
    this.alertModalDeleteCommunity.open();
  }

  public _getCommunityProjects() {
    this.communitySearchUtils.status = this.errorCodes.LOADING;
    this.communityProjects = [];
    this.communitySearchUtils.totalResults = 0;
    this.communitySearchUtils.page = 1;
    this.communitySearchUtils.keyword = "";

    this.subscriptions.push(this._searchCommunityProjectsService.searchProjects(this.properties, this.community.communityId).subscribe(
      data => {
        this.communityProjects = data;
        this.previewCommunityProjects = this.communityProjects;
        this.sort();

        this.communitySearchUtils.totalResults = data.length;
        this.communitySearchUtils.status = this.errorCodes.DONE;

        this.communityProjectsChanged.emit({
          value: this.communityProjects,
        });

        this.createFunderFilter();

        this.loading = false;
      },
      err => {
        console.error(err);
        //TODO check erros (service not available, bad request)

        if (err.status == '404') {
          this.communitySearchUtils.status = this.errorCodes.NOT_FOUND;
        } else if (err.status == '500') {
          this.communitySearchUtils.status = this.errorCodes.ERROR;
        } else {
          this.communitySearchUtils.status = this.errorCodes.NOT_AVAILABLE;
        }

        this.loading = false;
      }
    ));
  }

  public createFunderFilter(): void {
    let funders: Set<string> = new Set<string>();
    this.allOptions = [];
    let i;
    for (i = 0; i < this.communityProjects.length; i++) {
      let funder = this.communityProjects[i].funder;
      if (funder && !funders.has(funder)) {
        funders.add(funder);
        this.allOptions.push({label: funder, value: {id: funder, label: funder}});
      }
    }
  }

  public updatePage($event) {
    HelperFunctions.scroll();
    this.page = $event.value;
  }

  addNew() {
    this.addProjects.emit();
  }

  public applyFilters() {
    this.previewCommunityProjects = this.communityProjects.filter(project => {
      return (this.filterCommunityProjectByKeyword(project) && this.filterCommunityProjectByFunder(project));
    });
    // check paging here!!!
    if (this.previewCommunityProjects.slice((this.page - 1) * this.resultsPerPage, this.page * this.resultsPerPage).length == 0) {
      this.page = 1;
    }

    this.sort();
  }

  public filterCommunityProjectByKeyword(project): boolean {
    return this.searchText.toString() === ''
      || ((project.name + " " + project.acronym + " " + project.grantId + " " + project.funder)).match(this.searchText) != null;
  }

  public filterCommunityProjectByFunder(project): boolean {
    if (this.fundersCtrl.getRawValue().length == 0) {
      return true;
    }
    for (let funder of this.fundersCtrl.getRawValue()) {
      if (project.funder.toLowerCase().indexOf(funder.label.toLowerCase()) != -1) {
        return true;
      }
    }
    return false;
  }

  private sort() {
    let sortOption: { sort: string, descending: boolean } = this.filterForm.get('sort').value;

    this.previewCommunityProjects.sort((left, right): number => {
      if (sortOption.sort == "title") {
        if ((left.name + left.acronym) > (right.name + right.acronym)) {
          return sortOption.descending ? -1 : 1;
        } else if ((left.name + left.acronym) < (right.name + right.acronym)) {
          return sortOption.descending ? 1 : -1;
        }
      } else if (sortOption.sort == "grant") {
        if (left.grantId > right.grantId) {
          return sortOption.descending ? -1 : 1;
        } else if (left.grantId < right.grantId) {
          return sortOption.descending ? 1 : -1;
        }
      } else if (sortOption.sort == "funder") {
        if (left.funder > right.funder) {
          return sortOption.descending ? -1 : 1;
        } else if (left.funder < right.funder) {
          return sortOption.descending ? 1 : -1;
        }
      }

      return 0;
    });
  }

  public onSearchClose() {
    this.communitySearchUtils.keyword = this.filterForm.get('keyword').value;
  }

  public resetInput() {
    this.communitySearchUtils.keyword = null;
    this.searchInputComponent.reset()
  }

  handleError(message: string) {
    NotificationHandler.rise(message, 'danger');
  }

  select(value: string, event, dropdownFilter: DropdownFilterComponent) {
    if(event.target instanceof HTMLInputElement) {
      dropdownFilter.closeDropdown();
      if(event.target.checked && !this.selectedFunders.find(entity => value === entity)) {
        this.selectedFunders.push(value);
        this.fundersCtrl.setControl(this.fundersCtrl.value.length, this._fb.control(value));
      } else if(!event.target.checked) {
        let index = this.selectedFunders.indexOf(value);
        if(index !== -1) {
          this.selectedFunders.splice(index, 1);
          this.fundersCtrl.removeAt(index);
        }
      }
    }
  }

  isSelected(value: string) {
    return this.filterForm && this.filterForm.get('funder').value.find(funder => funder === value)
  }
}