import {Injectable} from '@angular/core';
import {Http, Response} from '@angular/http';
import {HttpClient} from "@angular/common/http";
import {Observable}     from 'rxjs';
import {Metrics} from '../utils/entities/metrics';

import{EnvProperties} from '../utils/properties/env-properties';
import {catchError, map} from "rxjs/operators";

@Injectable()
export class MetricsService {
    metrics: Metrics;

    constructor(private http: HttpClient ) {}

    hasAltMetrics(url: string, doi: string): Observable<boolean> {
        return this.http.get(url + doi).pipe(map(res => !!(res)));
    }
    
    getMetrics (id: string, entityType: string, properties:EnvProperties):any {
        let url = properties.metricsAPIURL+entityType+"/"+id+"/clicks";
        let key = url;

        return this.http.get((properties.useCache)? (properties.cacheUrl+encodeURIComponent(url)): url)
                    .pipe(map(res => this.parseMetrics(res["downloads"], res["views"], res["total_downloads"], res["total_views"],
                                                  res["total_openaire_views"], res["total_openaire_downloads"], res["pageviews"], properties)));
    }


    parseMetrics(downloads: any, views: any, totalDownloads: number, totalViews: number,
                totalOpenaireViews: number, totalOpenaireDownloads: number, pageViews: number, properties:EnvProperties): any {
        this.metrics = new Metrics();

        this.metrics.totalDownloads = totalDownloads;
        this.metrics.totalViews = totalViews;
        this.metrics.totalOpenaireViews = totalOpenaireViews;
        this.metrics.totalOpenaireDownloads = totalOpenaireDownloads;
        this.metrics.pageViews = pageViews;

        this.metrics.infos = new Map<string, {"name": string, "url": string, "numOfDownloads": string, "numOfViews": string, "openaireDownloads": string, "openaireViews": string}>();

        for(let i=0; i<downloads.length; i++) {
            let id: string = downloads[i]['datasource_id'];
            if(this.metrics.infos.has(id)) {
                this.metrics.infos.get(id).numOfDownloads = downloads[i]['value'];
                this.metrics.infos.get(id).openaireDownloads = downloads[i]['openaire'];
            } else {
                let info;//: {"url": string, "numOfDownloads": string, "numOfViews": string};
                info = {};

                info.name = downloads[i]['datasource_name'];
                info.url = properties.searchLinkToDataProvider+id;
                info.numOfDownloads = downloads[i]['value'];
                info.openaireDownloads = downloads[i]['openaire'];
                info.numOfViews = "0";
                info.openaireViews = "0";

                this.metrics.infos.set(id, info);
            }
        }

        for(let i=0; i<views.length; i++) {
            let id: string = views[i]['datasource_id'];
            if(this.metrics.infos.has(id)) {
                this.metrics.infos.get(id).numOfViews = views[i]['value'];
                this.metrics.infos.get(id).openaireViews = views[i]['openaire'];
            } else {
                let info;//: {"url": string, "numOfDownloads": string, "numOfViews": string};
                info = {};

                info.name = views[i]['datasource_name'];
                info.url = properties.searchLinkToDataProvider + id;
                info.numOfDownloads = "0";
                info.openaireDownloads = "0";
                info.numOfViews = views[i]['value'];
                info.openaireViews = views[i]['openaire'];

                this.metrics.infos.set(id, info);
            }
        }

        return this.metrics;
    }
}