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";
import {HelperFunctions} from "../../utils/HelperFunctions.class";

@Injectable({providedIn: 'root'})
export class CommunityService {
  
  public community: BehaviorSubject<CommunityInfo> = null;
  private promise: Promise<boolean> = null;
  private sub;
  
  constructor(private http: HttpClient) {
    this.community = new BehaviorSubject(null);
  }
  
  ngOnDestroy() {
    this.clearSubscriptions();
  }
  
  clearSubscriptions() {
    if (this.sub instanceof Subscriber) {
      this.sub.unsubscribe();
    }
  }
  
  // TODO Remove these functions
  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();
  }
  
  public getCommunityAsObservable() {
    return this.community.asObservable();
  }
  
  setCommunity(community: CommunityInfo) {
    this.community.next(community);
  }
  
  private formalize(element: any) {
    return HelperFunctions.copy(element);
  }
  
  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)));
  }
  
  // TODO remove NEW from function names
  getCommunityNew(communityId: string) {
    if(!this.community.value || this.community.value.communityId !== communityId) {
      this.promise = new Promise<any>((resolve, reject) => {
        this.sub = this.http.get<CommunityInfo>(properties.communityAPI + communityId)
          .pipe(map(community => this.formalize(this.parseCommunity(community)))).subscribe(community => {
              this.community.next(community);
              resolve();
            },
            error => {
              this.community.next(null);
              resolve();
            })
      });
    }
    return from(this.getCommunityAsync());
  }
  
  async getCommunityAsync() {
    await this.promise;
    this.clearSubscriptions();
    return this.community.getValue();
  }
  
  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;
  }
  
}