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

import { ParsingFunctions } from '../landing-utils/parsingFunctions.class';

@Injectable()
export class DatasetService {

  constructor(private http: Http ) {
    this.parsingFunctions = new ParsingFunctions();
  }

  public parsingFunctions: ParsingFunctions;
  datasetInfo: DatasetInfo;

  getDatasetInfo (id: string, properties:EnvProperties):any {

    let url = properties.searchAPIURLLAst+'datasets/'+id+"?format=json";
    let key = url;


    return this.http.get((properties.useCache)? (properties.cacheUrl+encodeURIComponent(url)): url)
                    .map(res => <any> res.json())
                    .map(res => [res['result']['header']['dri:status'], res['result']['metadata']['oaf:entity']['oaf:result'],res])
                    .map(res => [res[1],  //0
                                 res[1]['title'],   //1
                                 res[1]['rels']['rel'], //2
                                 res[1]['children'],  //3
                                 res[1]['pid'], //4
                                 res[1]['subject'], //5
                                 res[1]['bestaccessright'], //6
                                 res[1]['collectedfrom'], //7
                                 res[1]['context'], //8
                                 //res[1]['resulttype'],
                                 res[0],  //9
                                 res[1]['creator'], //10
                                 res[1]['language'],  //11
                                 res[1]['country'], //12
                                 res[2], //13
                                 (res[1]['extraInfo']!= undefined && res[1]['extraInfo']['citations']!= undefined)? res[1]['extraInfo']['citations']['citation']:null, //14
                                  res[1]['journal'] //15
                    ]).map(res => this.parseDatasetInfo(res));
  }

  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');
  }

  parseDatasetInfo (data: any):any {
    this.datasetInfo = new DatasetInfo();
    this.datasetInfo.record = data[13];
    // ['result']['metadata']['oaf:entity']['oaf:result']
    if(data[0] != null) {
      var date:string = (data[0].dateofacceptance)+""; // transform to string in case it is an integer
      this.datasetInfo.date  = (date && (date).indexOf('-') !== -1)?date.split('-')[0]:date;
      this.datasetInfo.dateofacceptance = data[0].dateofacceptance;
      this.datasetInfo.publisher = data[0].publisher;
      if(!Array.isArray(data[0].description)) {
        this.datasetInfo.description = String(data[0].description);
      } else {
        this.datasetInfo.description = String(data[0].description[0]);
      }
      this.datasetInfo.embargoEndDate = data[0].embargoenddate;
    }
    /*this.datasetInfo.title = {"name": "", "url": "", "accessMode": ""};
    if(data[0]['bestaccessright'] && data[0]['bestaccessright'].hasOwnProperty("classid")) {
      this.datasetInfo.title.accessMode = data[0]['bestaccessright'].classid;
    }
    if(data[1] != null) {
      if(Array.isArray(data[1])) {
        this.datasetInfo.title['name'] = data[1][0].content;
      } else {
        this.datasetInfo.title['name'] = data[1].content;
      }
    }*/
    if(data[0]['bestaccessright'] && data[0]['bestaccessright'].hasOwnProperty("classid")) {
      this.datasetInfo.accessMode = data[0]['bestaccessright'].classid;
    }
    // ['result']['metadata']['oaf:entity']['oaf:result']['title']
    if(data[1] != null) {
      if(Array.isArray(data[1])) {
        this.datasetInfo.title = data[1][0].content;
        if(data[1][1].classid == "subtitle") {
          this.datasetInfo.subtitle = data[1][1].content;
        }
      } else {
        this.datasetInfo.title = data[1].content;
      }
    }

    // ['result']['metadata']['oaf:entity']['oaf:result']['rels']['rel']
    if(data[2] != null) {
      let relation;
      let length = data[2].length!=undefined ? data[2].length : 1;

      for(let i=0; i<length; i++) {
        relation = data[2].length!=undefined ? data[2][i] : data[2];
        if(relation.hasOwnProperty("to")) {
          if(relation['to'].class == "isProducedBy") {
            this.datasetInfo.fundedByProjects = this.parsingFunctions.parseFundingByProjects(this.datasetInfo.fundedByProjects, relation, this.datasetInfo.projectsProvenanceVocabulary);
          } else if(relation['to'].class == "isRelatedTo") {
            let provenanceAction: string;
            if(relation.provenanceaction in this.datasetInfo.researchResultsProvenanceVocabulary) {
              provenanceAction = this.datasetInfo.researchResultsProvenanceVocabulary[relation.provenanceaction];
            } else {
              provenanceAction = "Other"
            }

            this.datasetInfo.relatedResearchResults = this.parsingFunctions.parseRelatedResearchResults(this.datasetInfo.relatedResearchResults, relation, provenanceAction);

          } else if(relation['to'].class == "hasAmongTopNSimilarDocuments") {
            this.datasetInfo.similarResearchResults = this.parsingFunctions.parseSimilarResearchResults(this.datasetInfo.similarResearchResults, relation);
          }
        }
      }
    }

    // ['result']['metadata']['oaf:entity']['oaf:result']['children']
    if(data[3] != null) {
      if(data[3].hasOwnProperty("instance")) {
        this.datasetInfo.hostedBy_collectedFrom = new Array<{ "downloadName": string, "downloadUrl": string[],
                                                              "collectedName": string, "collectedId": string,
                                                              "accessMode": string[], "bestAccessMode": string,
                                                              "type": string, "year":string}>();

        this.datasetInfo.types = new Array<string>();
        let types = new Set<string>();

        let counter = 0;
        let instance;

        let length = data[3]['instance'].length!=undefined ? data[3]['instance'].length : 1;

        for(let i=0; i<length; i++) {
          instance = data[3]['instance'].length!=undefined ? data[3]['instance'][i] : data[3]['instance'];

          this.parsingFunctions.parseTypes(this.datasetInfo.types, types, instance);

          if(instance.hasOwnProperty("webresource")) {
            let url;
            if(instance['webresource'].length == undefined) {
              url = instance['webresource'].url;
            } else{
              url = instance['webresource'][0].url;
            }

            if(instance.hasOwnProperty("hostedby")) {
              counter = this.parsingFunctions.parseHostedBy_collectedFrom(this.datasetInfo.hostedBy_collectedFrom, instance, data[0], url, counter/*, this.datasetInfo.title*/, this.datasetInfo.accessMode);
            }
          }
        }
      }
    }

    // ['result']['metadata']['oaf:entity']['oaf:result']['pid']
    if(data[4] != null) {
      this.datasetInfo.identifiers = this.parsingFunctions.parseIdentifiers(data[4]);
    }

    // ['result']['metadata']['oaf:entity']['oaf:result']['subject']
    if(data[5] != null) {
      let subjectResults: [string[], Map<string, string[]>, Map<string, string[]>] = this.parsingFunctions.parseAllSubjects(data[5]);
      this.datasetInfo.subjects = subjectResults[0];
      this.datasetInfo.otherSubjects = subjectResults[1];
      this.datasetInfo.classifiedSubjects = subjectResults[2];
    }

    this.datasetInfo.hostedBy_collectedFrom = this.parsingFunctions.addPublisherToHostedBy_collectedFrom(
                this.datasetInfo.hostedBy_collectedFrom, this.datasetInfo.publisher,
                null, this.datasetInfo.identifiers/*, this.datasetInfo.title*/);

    // ['result']['metadata']['oaf:entity']['oaf:result']['context']
    if(data[8] != null) {
      this.datasetInfo.contexts = this.parsingFunctions.parseContexts(data[8]);
    }

    // if(data[9] != null && this.datasetInfo.type == undefined) {
    //   if(data[9].hasOwnProperty('classname')) {
    //     this.datasetInfo.type = data[9].classname;
    //   }
    // }

    // ['result']['header']['dri:status']
    if(data[9] != null && data[9] == "under curation") {
      this.datasetInfo.underCurationMessage = true;
    } else {
      this.datasetInfo.underCurationMessage = false;
    }

    // ['result']['metadata']['oaf:entity']['oaf:result']['creator']
    if(data[10] != null) {
      if(this.datasetInfo.authors == undefined) {
        this.datasetInfo.authors = new Array<string>();
      }

      let authors = data[10];
      let length = Array.isArray(authors) ? authors.length : 1;
      for(let i=0; i<length; i++) {
        let author = Array.isArray(authors) ? authors[i] : authors;
        this.datasetInfo.authors[author.rank] = author.content;

      }

      this.datasetInfo.authors = this.datasetInfo.authors.filter(function (item) {
        return (item != undefined);
      });
    }

    // ['result']['metadata']['oaf:entity']['oaf:result']['language']
    if(data[11] != null) {
      this.datasetInfo.languages = this.parsingFunctions.parseLanguages(data[11]);
    }
    // ['result']['metadata']['oaf:entity']['oaf:result']['country']
    if(data[12] != null) {
      this.datasetInfo.countries = this.parsingFunctions.parseCountries(data[12]);
    }

    // ['result']['metadata']['oaf:entity']['oaf:result']['extraInfo']['citations']['citation']
    if(data[14] != null) {
      this.datasetInfo.references = this.parsingFunctions.parseReferences(data[14]);
    }

    if(this.datasetInfo.relatedResearchResults) {
      let self = this;
      this.datasetInfo.relatedResearchResults.forEach(function (value, key, map) {
        self.datasetInfo.relatedResearchResults.set(key, self.parsingFunctions.sortByPercentage(value));
      });
    }
    this.datasetInfo.similarResearchResults = this.parsingFunctions.sortByPercentage(this.datasetInfo.similarResearchResults);
    if(data[15] != null) {
      this.datasetInfo.journal = {"journal": "", "issn": "", "lissn": "", "eissn": "", "issue": "", "volume": "", "start_page": "", "end_page": ""}

      this.datasetInfo.journal['journal'] = data[15].content;
      this.datasetInfo.journal['issn'] = data[15].issn;
      this.datasetInfo.journal['lissn'] = data[15].lissn;
      this.datasetInfo.journal['eissn'] = data[15].eissn;
      this.datasetInfo.journal['issue'] = data[15].iss;
      this.datasetInfo.journal['volume'] = data[15].vol;
      this.datasetInfo.journal['start_page'] = data[15].sp;
      this.datasetInfo.journal['end_page'] = data[15].ep;
    }

    return this.datasetInfo;
  }
}