import { Injectable } from '@angular/core';
import {HttpClient, HttpHeaders} from "@angular/common/http";
import { CommunityInfo } from './communityInfo';
import {EnvProperties} from '../../utils/properties/env-properties';
import {map} from "rxjs/operators";
import {BehaviorSubject, from, Subscriber} from "rxjs";
import {properties} from "../../../../environments/environment";

@Injectable({  providedIn: 'root' })
export class CommunityService {

  public community: BehaviorSubject<CommunityInfo> = null;
  private promise: Promise<boolean> = null;

  constructor(private http: HttpClient) {
    this.community = new BehaviorSubject(null);
  }
  sub;
  ngOnDestroy() {
    this.clearSubscriptions();
  }
  clearSubscriptions(){
    if (this.sub instanceof Subscriber) {
      this.sub.unsubscribe();
    }
  }
  getCommunityByService(properties: EnvProperties, url: string) {
    this.promise = new Promise<any>(resolve => {
      this.sub = this.getCommunity(properties, url).subscribe(res => {
        this.community.next(res);
        resolve();
      },
      error => {
        this.community.error(error);
        resolve();
      })
    });
  }

  async  getCommunityByStateAsync(properties: EnvProperties, url: string) {
    if(!this.promise) {
      this.getCommunityByService(properties, url);
    }

    await this.promise;
    this.clearSubscriptions();
    return this.community.getValue();
  }

  getCommunityByState(properties: EnvProperties, url: string) {
    return from(this.getCommunityByStateAsync(properties, url));
  }

  getCommunity(properties: EnvProperties, url: string) {
      return this.http.get((properties.useCache) ? (properties.cacheUrl + encodeURIComponent(url)) : url)
                      .pipe(map(res => this.parseCommunity(res)));
  }

  updateCommunity(url: string, community: any) {
      //const headers = new Headers({'Content-Type': 'application/json'});
      //const options = new RequestOptions({headers: headers});

      const options = {
        headers: new HttpHeaders({
          'Content-Type': 'application/json',
        })
      };

      const body = JSON.stringify(community);
      return this.http.post(url, body, options);
                        /*.map(res => res.json())*/
  }

  async isCommunityManagerByStateAsync(properties: EnvProperties, url: string, manager: string) {
    if(!this.promise) {
      this.getCommunityByService(properties, url);
    }

    await this.promise;
    let community: CommunityInfo = this.community.getValue();
    return (community.managers.indexOf(manager) !== -1);
  }

  isCommunityManagerByState(properties: EnvProperties, url: string, manager: string) {
    return from(this.isCommunityManagerByStateAsync(properties, url, manager));
  }

  /**
   * @deprecated
   */
  isCommunityManager(properties: EnvProperties, url: string, manager: string) {
    return this.http.get((properties.useCache) ? (properties.cacheUrl + encodeURIComponent(url)) : url)
                    //.map(res => <any> res.json())
                    .pipe(map(res => this.parseCommunity(res)))
                    .pipe(map(community => community.managers.indexOf(manager) !== -1));
  }

  async isTypeByStateAsync(properties: EnvProperties, url: string, type: string) {
    if(!this.promise) {
      this.getCommunityByService(properties, url);
    }

    await this.promise;
    let community: CommunityInfo = this.community.getValue();
    return (community && community.type && community.type === type);
  }

  isRITypeByState(properties: EnvProperties, url: string) {
    return from(this.isTypeByStateAsync(properties, url, "ri"));
  }

  isCommunityTypeByState(properties: EnvProperties, url: string) {
    return from(this.isTypeByStateAsync(properties, url, "community"));
  }

  /**
   * @deprecated
   */
  isRIType(properties: EnvProperties, url: string) {
    return this.http.get((properties.useCache) ? (properties.cacheUrl + encodeURIComponent(url)) : url)
        //.map(res => <any> res.json())
        .pipe(map(res => this.parseCommunity(res)))
        .pipe(map(community => (community && community.type && community.type === 'ri')));
  }

  /**
   * @deprecated
   */
  isCommunityType(properties: EnvProperties, url: string) {
      return this.http.get((properties.useCache) ? (properties.cacheUrl + encodeURIComponent(url)) : url)
          //.map(res => <any> res.json())
          .pipe(map(res => this.parseCommunity(res)))
          .pipe(map(community => (community && community.type && community.type === 'community')));
  }

  /**
  * @deprecated
  */
  isSubscribedToCommunity(pid: string, email: string, url: string) {
    return this.http.get(url + '/'+ properties.adminToolsPortalType +'/' + pid + '/subscribers')
                    //.map(res =>  ((<any>res === '') ? {} : <any> res.json()))
                    .pipe(map(res => {
                      if (res['subscribers'] && res['subscribers'] != null) {

                        for (let i = 0; i < res['subscribers'].length; i++ ) {
                          if (res['subscribers'][i] != null && res['subscribers'][i].email === email) {
                            return true;
                          }
                        }
                      }
                      return false;

                    }));
  }

  private parseCommunity(data: any): CommunityInfo {

      const resData = Array.isArray(data) ? data[0] : data;

      const community: CommunityInfo = new CommunityInfo();
      community['title'] = resData.name;
      community['shortTitle'] = resData.shortName;
      community['communityId'] = resData.id;
      community['queryId'] = resData.queryId;
      community['logoUrl'] = resData.logoUrl;
      community['description'] = resData.description;
      community['date'] = resData.creationDate;
      community['zenodoCommunity'] = resData.zenodoCommunity;
      community['status'] = 'all';
      if (resData.hasOwnProperty('status')) {
        community['status'] = resData.status;
        const status = ['all', 'hidden', 'manager'];
        if (status.indexOf(community['status']) === -1) {
          community['status'] = 'hidden';
        }
      }
      if (resData.type != null) {
            community['type'] = resData.type;
      }

      if (resData.managers != null) {
          if (community['managers'] === undefined) {
            community['managers'] = new Array<string>();
          }

          const managers = resData.managers;
          const length = Array.isArray(managers) ? managers.length : 1;

          for (let i = 0; i < length; i++) {
            const manager = Array.isArray(managers) ? managers[i] : managers;
            community.managers[i] = manager;
          }
      }

      if (resData.subjects != null) {
          if (community['subjects'] === undefined) {
            community['subjects'] = new Array<string>();
          }

          const subjects = resData.subjects;
          const length = Array.isArray(subjects) ? subjects.length : 1;

          for (let i = 0; i < length; i++) {
            const subject = Array.isArray(subjects) ? subjects[i] : subjects;
            community.subjects[i] = subject;
          }
      }
      return community;
  }

}