import {Injectable, OnDestroy} from '@angular/core';
import {HttpClient} from "@angular/common/http";
import {BehaviorSubject, from, Observable, of, Subscription} from 'rxjs';
import {map} from 'rxjs/operators';
import {EnvProperties} from "../properties/env-properties";
import {Portal} from "../entities/adminTool/portal";
import {Page} from "../entities/adminTool/page";
import {properties} from "../../../../environments/environment";

@Injectable({providedIn: 'root'})
export class ConfigurationService {
  private communityInformation: BehaviorSubject<Portal> = new BehaviorSubject(null);
  private sub: Subscription = null;
  private promise: Promise<void> = null;
  
  constructor(private http: HttpClient) {
  }
  
  ngOnDestroy() {
    this.clearSubscriptions();
  }
  
  clearSubscriptions() {
    if (this.sub) {
      this.sub.unsubscribe();
    }
  }
  
  /**
   * @deprecated
   */
  getCommunityInformation(properties: EnvProperties, community: string) {
    let url = properties.adminToolsAPIURL + "/" + properties.adminToolsPortalType + "/" + community + '/full';
    return this.http.get((properties.useLongCache) ? (properties.cacheUrl + encodeURIComponent(url)) : url);
    //.map(res => res.json());
  }
  
  public initStaticCommunityInformation(communityInformation: Portal) {
    this.promise = new Promise<void>((resolve => {
      this.communityInformation.next(communityInformation);
      resolve();
    }));
  }
  
  public initCommunityInformation(properties: EnvProperties, community: string) {
    if (community == null) return;
    let url = properties.adminToolsAPIURL + "/" + properties.adminToolsPortalType + "/" + community + "/full";
    this.promise = new Promise<void>((resolve => {
      this.sub = this.http.get<Portal>((properties.useLongCache) ? (properties.cacheUrl + encodeURIComponent(url)) : url).subscribe(
        (communityInformation: Portal) => {
          this.communityInformation.next(communityInformation);
          resolve();
        },
        error => {
          this.communityInformation.error(error);
          resolve();
        });
    }));
    
  }
  
  public get communityInformationState(): Observable<Portal> {
    return this.communityInformation.asObservable();
  }
  
  /**
   * @deprecated
   */
  isEntityEnabled(APIUrl: string, community: string, entity: string) {
    //console.log("isEntityEnabled:  "+entity);
    let url = "isEntityEnabled-" + entity;
    
    //  if(entity == "publication" || entity == "dataset" || entity == "datasource"){
    //     return Observable.of(new Object()).mapTo(false);
    //  }
    //  return Observable.of(new Object()).mapTo(true);
    return this.http.get(APIUrl + "/page")
      .pipe(map(res => true));
  }
  
  isPageEnabled(portal: string, route: string, portalType = properties.adminToolsPortalType) {
    let url = properties.adminToolsAPIURL + "/" + portalType + "/" + portal + "/pages?page_route=" + route;
    return this.http.get((properties.useLongCache) ? (properties.cacheUrl + encodeURIComponent(url)) : url)
      .pipe(map(res => {
        let result = false;
        if (res['length'] > 0 && res[0].route == route) {
          result = res[0].isEnabled;
        }
        return result;
      }));
  }
  
  async isPageEnabledByStateAsync(properties: EnvProperties, portal: string, page_route: string) {
    if (!this.promise || (this.communityInformation && this.communityInformation.getValue() && portal !== this.communityInformation.getValue().pid)) {
      this.initCommunityInformation(properties, portal);
    }
    
    await this.promise;
    if (this.sub) {
      this.sub.unsubscribe();
    }
    return this.filtering(page_route);
  }
  
  isPageEnabledByState(properties: EnvProperties, portal: string, router: string): Observable<boolean> {
    let page_route: string = router.split('?')[0].substring(1);
    return from(this.isPageEnabledByStateAsync(properties, portal, page_route));
  }
  
  filtering(page_route: string) {
    let community: Portal = this.communityInformation.getValue();
    let pages: Page[] = <Page[]>community.pages;
    if (pages) {
      let page = pages.find((page: Page) => page.route == page_route);
      return page && page.isEnabled;
    } else {
      return false;
    }
  }
  
  /**
   * @deprecated
   */
  getMainPageContent(APIUrl: string, community: string,) {
    return this.http.get(APIUrl + "/page")
      .pipe(map(res => true));
  }
  
  /**
   * @deprecated
   */
  getSpecialAnouncementContent(APIUrl: string, community: string,) {
    return this.http.get(APIUrl + "/page")
      .pipe(map(res => ""));
  }
  
  /**
   * @deprecated
   */
  getHelpPageContent(APIUrl: string, community: string, router: string) {
    return this.http.get(APIUrl + "/page")
      .pipe(map(res => true));
  }
  
  // private handleError (error: Response) {
  // // in a real world app, we may send the error to some remote logging infrastructure
  // // instead of just logging it to the console
  //     console.log(error);
  //     return this.http.get(this.APIUrl + "/page")
  //               .map(res => true);
  // }
  
  
}