import {Injectable} from '@angular/core';
import {HttpClient, HttpErrorResponse} from "@angular/common/http";
import {throwError} from 'rxjs';
import {ResultLandingInfo} from '../../utils/entities/resultLandingInfo';
import {EnvProperties} from '../../utils/properties/env-properties';
import {ParsingFunctions} from '../landing-utils/parsingFunctions.class';
import {map, tap} from "rxjs/operators";

@Injectable()
export class ResultLandingService {

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

  public parsingFunctions: ParsingFunctions;
  resultLandingInfo: ResultLandingInfo;

  getResultLandingInfo (id: string, type: string, provenanceActionVocabulary: any, properties: EnvProperties): any {
    let url = properties.searchAPIURLLAst;
    if (type === 'publication') {
      url += 'publications/';
    } else if (type === 'dataset') {
      url += 'datasets/';
    } else if (type === 'software') {
      url += 'software/';
    } else if (type === 'orp') {
      url += 'other/';
    }
    url += id + '?format=json';

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

  getProvenanceActionVocabulary (properties: EnvProperties): any {
    let url = properties.vocabulariesAPI+"dnet:provenanceActions.json";

    return this.http.get((properties.useCache) ? (properties.cacheUrl + encodeURIComponent(url)) : url)
      .pipe(map(res => res['terms']))
      .pipe(map(res => this.parseProvenanceActionVocabulary(res, properties)));
  }

  parseProvenanceActionVocabulary(terms: any, properties: EnvProperties) {
    var provenanceActionVocabulary: {} = {};
    for(let term of terms) {
      provenanceActionVocabulary[term.code] = term.englishName;
    }
    return provenanceActionVocabulary;
  }

  private handleError (error: HttpErrorResponse) {
    // 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 throwError(error  || 'Server error');
  }

  parseResultLandingInfo (data: any, provenanceActionVocabulary: any, properties: EnvProperties): any {
    this.resultLandingInfo = new ResultLandingInfo();

    // res
    this.resultLandingInfo.record = data[14];

    // res['result']['metadata']['oaf:entity']['oaf:result']
    if (data[0] != null) {
      let date: string = (data[0].dateofacceptance) + ''; // transform to string in case it is an integer
      this.resultLandingInfo.date  = (date && (date).indexOf('-') !== -1) ? date.split('-')[0] : date;
      this.resultLandingInfo.dateofacceptance = data[0].dateofacceptance;
      this.resultLandingInfo.publisher = data[0].publisher;
      if(!Array.isArray(data[0].description)) {
        this.resultLandingInfo.description = String(data[0].description);
      } else {
        this.resultLandingInfo.description = String(data[0].description[0]);
      }
      this.resultLandingInfo.embargoEndDate = data[0].embargoenddate;
    }

    if(data[0]['bestaccessright'] && data[0]['bestaccessright'].hasOwnProperty("classid")) {
      this.resultLandingInfo.accessMode = data[0]['bestaccessright'].classid;
    }

    // res['result']['metadata']['oaf:entity']['oaf:result']['title']
    if(data[1] != null) {
      if(Array.isArray(data[1])) {
        this.resultLandingInfo.title = String(data[1][0].content);
        if(data[1][1].classid === 'subtitle') {
          this.resultLandingInfo.subtitle = String(data[1][1].content);
        }
      } else {
        this.resultLandingInfo.title = String(data[1].content);
      }
    }

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

      for(let i=0; i<length; i++) {
        relation = Array.isArray(data[2]) ? data[2][i] : data[2];
        if(relation.hasOwnProperty("to")) {
          if(relation['to'].class == "isProducedBy") {
            this.resultLandingInfo.fundedByProjects = this.parsingFunctions.parseFundingByProjects(this.resultLandingInfo.fundedByProjects, relation, provenanceActionVocabulary);
          } else if(relation['to'].class == "isRelatedTo") {
            let provenanceAction: string = "";
            if(provenanceActionVocabulary != null && relation.provenanceaction in provenanceActionVocabulary) {
              provenanceAction = provenanceActionVocabulary[relation.provenanceaction];
            }

            this.resultLandingInfo.relatedResearchResults = this.parsingFunctions.parseRelatedResearchResults(this.resultLandingInfo.relatedResearchResults, relation, provenanceAction);
          } else if(relation['to'].class == "hasAmongTopNSimilarDocuments") {
            this.resultLandingInfo.similarResearchResults = this.parsingFunctions.parseSimilarResearchResults(this.resultLandingInfo.similarResearchResults, relation);
          } else if(relation['to'].class == "hasAuthorInstitution") {
            this.resultLandingInfo.organizations = this.parseRelatedOrganizations(this.resultLandingInfo.organizations, relation);
          }
        }
      }
    }

    // res['result']['metadata']['oaf:entity']['oaf:result']['children']
    if(data[3] != null) {
      if(data[3].hasOwnProperty("result")) {
        this.resultLandingInfo.deletedByInferenceIds = [];
        let length = Array.isArray(data[3]['result']) ? data[3]['result'].length : 1;

        for(let i=0; i<length; i++) {
          let result = Array.isArray(data[3]['result']) ? data[3]['result'][i] : data[3]['result'];
          this.resultLandingInfo.deletedByInferenceIds.push(result.objidentifier);
        }

      }

      if(data[3].hasOwnProperty("instance")) {
        this.resultLandingInfo.hostedBy_collectedFrom = new Array<{"downloadName": string, "downloadUrl": string[], "collectedName": string, "collectedId": string, "accessMode": string[], "bestAccessMode": string, "type": string, "year":string}>();


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

        let counter = 0;
        let instance;

        let length = Array.isArray(data[3]['instance']) ? data[3]['instance'].length : 1;

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

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

          if(instance.hasOwnProperty("webresource")) {
            let url;
            if(!Array.isArray(instance['webresource'])) {
              url = instance['webresource'].url;
            } else{
              url = instance['webresource'][0].url;
            }

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

      if(data[3].hasOwnProperty("externalreference")) {
        let externalResults: [Map<string, Map<string, string>>, { "name": string, "url": string}[]] = this.parseBioentitiesAndSoftware(data[3]);
        this.resultLandingInfo.bioentities = externalResults[0];
        this.resultLandingInfo.software = externalResults[1];
      }
    }

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

    // res['result']['metadata']['oaf:entity']['oaf:result']['journal']
    if(data[5] != null) {
      this.resultLandingInfo.journal = {"journal": "", "issn": "", "lissn": "", "eissn": "", "issue": "", "volume": "", "start_page": "", "end_page": ""}

      this.resultLandingInfo.journal['journal'] = data[5].content;
      this.resultLandingInfo.journal['issn'] = data[5].issn;
      this.resultLandingInfo.journal['lissn'] = data[5].lissn;
      this.resultLandingInfo.journal['eissn'] = data[5].eissn;
      this.resultLandingInfo.journal['issue'] = data[5].iss;
      this.resultLandingInfo.journal['volume'] = data[5].vol;
      this.resultLandingInfo.journal['start_page'] = data[5].sp;
      this.resultLandingInfo.journal['end_page'] = data[5].ep;
    }

    // res['result']['metadata']['oaf:entity']['oaf:result']['language']
    if(data[6] != null) {
      this.resultLandingInfo.languages = this.parsingFunctions.parseLanguages(data[6]);
    }

    // res['result']['metadata']['oaf:entity']['oaf:result']['country']
    if(data[10] != null) {
      this.resultLandingInfo.countries = this.parsingFunctions.parseCountries(data[10]);
    }

    // res['result']['metadata']['oaf:entity']['oaf:result']['subject']
    if(data[7] != null) {
      let subjectResults: [string[], Map<string, string[]>, Map<string, string[]>] = this.parsingFunctions.parseAllSubjects(data[7]);
      this.resultLandingInfo.subjects = subjectResults[0];
      this.resultLandingInfo.otherSubjects = subjectResults[1];
      this.resultLandingInfo.classifiedSubjects = subjectResults[2];
    }

    this.resultLandingInfo.hostedBy_collectedFrom = this.parsingFunctions.addPublisherToHostedBy_collectedFrom(
      this.resultLandingInfo.hostedBy_collectedFrom, this.resultLandingInfo.publisher,
      this.resultLandingInfo.journal, this.resultLandingInfo.identifiers);

    // res['result']['metadata']['oaf:entity']['oaf:result']['programmingLanguage']
    if(data[11] != null) {
      this.resultLandingInfo.programmingLanguages = this.parsingFunctions.parseProgrammingLanguages(data[11]);
    }

    // res['result']['metadata']['oaf:entity']['extraInfo']['citations']['citation']
    if(data[12] != null) {
      this.resultLandingInfo.references = this.parsingFunctions.parseReferences(data[12]);
    }

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

    // res['result']['header']['dri:status']
    if(data[13] != null && data[13] == "under curation") {
      this.resultLandingInfo.underCurationMessage = true;
    } else {
      this.resultLandingInfo.underCurationMessage = false;
    }

    // res['result']['metadata']['oaf:entity']['oaf:result']['creator']
    if(data[9] != null) {
      if(this.resultLandingInfo.authors == undefined) {
        this.resultLandingInfo.authors = new Array<{"fullName": string, "orcid": string}>();
      }

      let authors = data[9];
      let length = Array.isArray(authors) ? authors.length : 1;

      for(let i=0; i<length; i++) {
        let author = Array.isArray(authors) ? authors[i] : authors;
        if(author) {
          this.resultLandingInfo['authors'][author.rank] = {"fullName": author.content, "orcid": author.ORCID};
        }
      }
      this.resultLandingInfo.authors = this.resultLandingInfo.authors.filter(function (item) {
        return (item != undefined && item.fullName != undefined);
      });
    }

    if(this.resultLandingInfo.relatedResearchResults) {
      let self = this;
      this.resultLandingInfo.relatedResearchResults.forEach(function (value, key, map) {
        self.resultLandingInfo.relatedResearchResults.set(key, self.parsingFunctions.sortByPercentage(value));
      });
    }
    this.resultLandingInfo.similarResearchResults = this.parsingFunctions.sortByPercentage(this.resultLandingInfo.similarResearchResults);

    return this.resultLandingInfo;
  }

  parseRelatedOrganizations(organizations: {"name": string, "shortname":string, "id": string, "websiteUrl": string, "country": string, "trust": number}[], relation: any):
    {"name": string, "shortname":string, "id": string, "websiteUrl": string, "country": string, "trust": number}[] {
    if(organizations == undefined) {
      organizations = new Array<{
        "name": string, "shortname": string,
        "id": string, "websiteUrl": string,
        "country": string, "trust": number}>();
    }

    let organization: { "name": string, "shortname": string,
      "id": string, "websiteUrl": string,
      "country": string, "trust": number
    } = {
      "name": "", "shortname": "",
      "id": "", "websiteUrl": "",
      "country": "", "trust": null
    };

    organization.id = relation['to'].content;
    organization.name = relation.legalname;
    organization.shortname = relation.legalshortname;
    organization.websiteUrl = relation.websiteurl;
    if(relation.country) {
      organization.country = relation.country.classname;
    }
    if(relation.trust) {
      organization.trust = Math.round(relation.trust*100);
    }

    organizations.push(organization);
    return organizations;
  }

  parseBioentitiesAndSoftware(children: any) : [Map<string, Map<string, string>>, { "name": string, "url": string}[]] {
    let bioentities: Map<string, Map<string, string>>;
    let software: {"name": string, "url": string}[];

    let length = Array.isArray(children['externalreference']) ? children['externalreference'].length : 1;

    let externalreference;
    for(let i=0; i<length; i++) {
      externalreference = Array.isArray(children['externalreference']) ? children['externalreference'][i] : children['externalreference'];

      if(externalreference.hasOwnProperty("qualifier")) {
        if(externalreference['qualifier'].classid == "accessionNumber") {

          if(bioentities == undefined) {
            bioentities = new Map<string, Map<string, string>>();
          }

          if(!bioentities.has(externalreference.sitename)) {
            bioentities.set(externalreference.sitename, new Map<string, string>());
          }
          bioentities.get(externalreference.sitename).set(externalreference.refidentifier, externalreference.url);

        } else if(externalreference['qualifier'].classid == "software") {

          if(software == undefined) {
            software = new Array<{"name": string, "url": string}>();
          }

          software.push({"name": externalreference.sitename, "url": externalreference.url});
        }
      }
    }

    return [bioentities, software];
  }

  getOpenCitations(id: string, properties:EnvProperties) {
    //https://services.openaire.eu/opencitations/getCitations?id=doajarticles::2634200c24772ee8f10232d3e184ec65
    let url = properties.openCitationsAPIURL+id;// "https://services.openaire.eu/opencitations/getCitations?id=" + id;
    let key = url;

    //return this.http.get((properties.useCache)? (properties.cacheUrl+encodeURIComponent(url)): url)
    return this.http.get(url)
      .pipe(map(res => [res['total'], this.parseOpenCitations(res['results'])]));
  }

  parseOpenCitations(openCitations: any): {"url": string, "title": string, "year": string, "doi": string, "authors": string[]}[] {
    //title, doi, authors
    let citations = new Array<{"url": string, "title": string, "year": string, "doi": string, "authors": string[]}>();

    let openCitation;

    let length = Array.isArray(openCitations) ? openCitations.length : 1;
    for(let i=0; i<length; i++) {
      openCitation = Array.isArray(openCitations) ? openCitations[i] : openCitations;

      let citation: {"url": string, "title": string,  "year": string, "doi": string, "authors": string[]} = {"url": "", "title": "", "year": "", "doi": "", "authors": []};

      if(openCitation && openCitation.id) {
        citation.url = openCitation.id;
        citation.title = openCitation.title;
        //citation.type = openCitation.type;
        citation.year = (openCitation.pubDate && (openCitation.pubDate).indexOf('-') !== -1)?openCitation.pubDate.split('-')[0]:openCitation.pubDate;
        citation.doi = openCitation.doi;

        let authorsLength = Array.isArray(openCitation.authors) ? openCitation.authors.length : 1;
        for(let i=0; i<authorsLength; i++) {
          let author = Array.isArray(openCitation.authors) ? openCitation.authors[i] : openCitation.authors;

          if(author) {
            let lastFirstName: string = "";
            if(author.lastName) {
              lastFirstName = author.lastName;
            }
            if(author.lastName && author.firstName) {
              lastFirstName += ", ";
            }
            if(author.firstName) {
              lastFirstName += author.firstName;
            }

            if(lastFirstName) {
              citation.authors.push(lastFirstName);
            }
          }
        }
        citations.push(citation);
      }
    }
    return citations;
  }
}