import {Injectable} from '@angular/core';
import {Http, Response} from '@angular/http';
import {Observable}     from 'rxjs/Observable';
import 'rxjs/add/observable/of';
import 'rxjs/add/operator/do';
import 'rxjs/add/operator/share';
import{EnvProperties} from '../../../utils/properties/env-properties';
import { ClaimResult} from  '../claimEntities.class';

@Injectable()
export class SearchDataciteService {
  constructor(private http: Http ) {}

  searchDataciteResults (term: string, size : number, page : number, properties:EnvProperties, parse:boolean = false):any {
    console.info("In search datacite results "+term+ " "+properties.searchDataciteAPIURL);
    let url = properties.searchDataciteAPIURL+'?query='+term+'&rows='+size+'&start='+(size*(page-1));
    let key = url;

    return this.http.get( ( properties.useCache)? (properties.cacheUrl+encodeURIComponent(url)): url)
                     .map(request => <any> request.json())
                     .map(request => (parse?this.parse(request.data):request))
                     .do(items => console.info(items))
                      //.catch(this.handleError);
    }
    getDataciteResultByDOI (doi: string, properties:EnvProperties, parse:boolean = false):any {
      console.info("Fetch datacite resultt by DOI: "+doi);
      let url =  properties.searchDataciteAPIURL+'/'+doi;
      let key = url;

      return this.http.get( (properties.useCache)? (properties.cacheUrl+encodeURIComponent(url)): url)
                       .map(request => <any> request.json())
                       .map(request => (parse?this.parse(request.data):request))
                       .do(items => console.info(items));

                      //  .do(items => console.log("Datacite Results: total results = "+items.meta.total+" doi = "+doi))

                       //.catch(this.handleError);
      }


  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');
  }
  private extractData(res: Response) {
    if (res.status < 200 || res.status >= 300) {
      throw new Error('Bad response status: ' + res.status);
    }
    let body = res.json();
    return body.data || { };
  }
  parse(response):ClaimResult[]{
    var results:ClaimResult[] = [];
    for(var i=0; i<response.length; i++){
      var item=response[i];
      var result:ClaimResult = new ClaimResult();
      result.publisher =  null;
      result.journal =  null;
      result.DOI = item.attributes.doi;
      result.id = item.attributes.doi;
      result.title = item.attributes.title;
      result.url = 'http://dx.doi.org/'+item.attributes.doi;
      result.source = 'datacite';
      result.type = 'dataset';
      result.date = item.attributes.published;
      result.accessRights =  "OPEN";
      result.publisher =item.attributes['container-title']
      result.journal = null;
      result.result = item;
      if(item.attributes.author){
        for(var j=0; j<item.attributes.author.length; j++){
          var author = item.attributes.author[j];
            result.authors.push((author.family)?author.family+', '+author.given:author.literal);
        }
      }
      results.push(result);
    }

    return results;

  }
}