import {Injectable} from '@angular/core';
import {Http, Response} from '@angular/http';
import {Observable}     from 'rxjs/Observable';
import {AutoCompleteValue} from '../searchPages/searchUtils/searchHelperClasses.class';
import {OpenaireProperties} from '../utils/properties/openaireProperties';
import 'rxjs/add/observable/of';
import 'rxjs/add/operator/do';
import 'rxjs/add/operator/share';
import {   } from '../shared/cache.service';
import {RefineResultsUtils} from './servicesUtils/refineResults.class';

@Injectable()
export class RefineFieldResultsService {
  // scoobydoo.di.uoa.gr:8181/dnet-functionality-services-2.0.0-SNAPSHOT/rest/v2/api/projects?refine=true&fields=funderid&page=1&size=0
     constructor(private http: Http ) {}
     getRefineFieldsResultsByEntityName(fields:string[], entityName:string):any{
        let url = OpenaireProperties.getSearchAPIURLForEntity(entityName)+"?format=json&refine=true&page=1&size=0";
        for(var i=0; i < fields.length; i++){
            url += "&fields="+fields[i];
        }

        return this.http.get((OpenaireProperties.isCacheEnabled())? (OpenaireProperties.getCacheUrl()+encodeURIComponent(url)): url)
                    .map(res => <any> res.json())

                    .map(res =>   [res['meta'].total, RefineResultsUtils.parse(res['refineResults'],fields, entityName)]);

     }
    getRefineFieldResultsByFieldName(fieldName:string, entityName:string):any{
       let link = OpenaireProperties.getSearchAPIURLForEntity(entityName)+"?fields="+fieldName + "&format=json";
        return  this.getField(link,fieldName)

    }

    getField (link:string,fieldName:string):any{
      let url = link+"&refine=true&page=1&size=0";

      return this.http.get((OpenaireProperties.isCacheEnabled())? (OpenaireProperties.getCacheUrl()+encodeURIComponent(url)): url)
                  .map(res => <any> res.json())
                  .map(res => res['refineResults'])                   
                  .map(res =>  this.parse(res,fieldName));

    }
    parse(data: any,fieldName:string):any {
      var values:AutoCompleteValue[] = [];
      if(data){
          let field = data[fieldName];
          for(let i=0; i<field.length; i++) {
            var value:AutoCompleteValue = new AutoCompleteValue();
            value.label = field[i].name;
            value.label = RefineResultsUtils.inParenthesisThePartAfterCharacters(field[i],"||");
            value.id = field[i].id;
            values.push(value);

        }
    }

    return values;
    }

    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 Observable.throw(error  || 'Server error');
    }
}