import {throwError as observableThrowError,  Observable } from 'rxjs';
/**
* @Service:Base Service
* @Creation Date: Aug 3, 2017
* @Author: sbaireddy
* @Version: 1.0 :
*/

import { Response } from '@angular/http';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import { HttpHeaders, HttpErrorResponse } from '@angular/common/http';
import { environment } from '../../environments/environment';

export abstract class BaseService {

      public httpOptions(): any {
            const METHOD_NAME: string = 'getRequestOptions()';
            // console.log('Util.getRequestOptions()>>Start');
            let reqHeaders: any = {
                  'Content-Type': 'application/json', 
                  'Accept': 'application/json;text/html', 
                  'Cache-Control': 'no-cache',
                  'Authorization': environment.basicAuth?environment.basicAuth:'Basic dGVzdGFkbWluOnBhc3N3MHJk'
            };
            //let headers = new HttpHeaders({ 'Content-Type': 'application/json', 'Cache-Control': 'no-cache' });
            //headers.append('Accept', 'application/json;text/html');
            //headers.append('Cache-Control', 'no-cache');
            //headers.append('Cache-control', 'no-store');
            //headers.append('Expires', '0');
            //headers.append('Pragma', 'no-cache');

            if (sessionStorage.getItem('userId')) {
                  reqHeaders.userId = sessionStorage.getItem('userId');
                  //headers.append('userId', sessionStorage.getItem('userId'));
            }
            if (sessionStorage.getItem('WCToken')) {
                  reqHeaders.WCToken = sessionStorage.getItem('WCToken');
                  //headers.append('WCToken', sessionStorage.getItem('WCToken'));
            }
            if (sessionStorage.getItem('WCTrustedToken')) {
                  reqHeaders.WCTrustedToken = sessionStorage.getItem('WCTrustedToken');
                  //headers.append('WCTrustedToken', sessionStorage.getItem('WCTrustedToken'));
            }
            if (sessionStorage.getItem('personalizationID')) {
                  reqHeaders.personalizationID = sessionStorage.getItem('personalizationID');
                  //headers.append('personalizationID', sessionStorage.getItem('personalizationID'));
            }
            const options = { withCredentials: true, headers: new HttpHeaders(reqHeaders) };
            // console.log('Util.getRequestOptions()>>End');
            return options;
      }
      protected handleError(error: Response | any) {
            // In a real world app, you might use a remote logging infrastructure
            // 503 Service Unavailable
            let errMsg: string;
            try {
                  if (error instanceof HttpErrorResponse) {
                        if (!error.ok) {
                              const err = JSON.stringify(error.error);
                              errMsg = `${error.status} - ${error.statusText || ''} ${err}`;
                        } else {
                              // No JSON expected or available for these error codes.
                              errMsg = error.toString();
                        }
                  } else {
                        errMsg = error.message ? error.message : error.toString();
                  }
            } catch (handlingError) {
                  errMsg = error.toString();
            }
            console.error(errMsg);
            return observableThrowError(errMsg);
      }
}