import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http'

import { Observable } from 'rxjs';
import { map, catchError } from 'rxjs/operators';

import { Album } from './model/album';
import { ElsService } from './els.service';

@Injectable()
export class ElsAlbumService extends ElsService {
  public static readonly GET_ALBUMS_DEFAULT_QUERY = {
    'query': {
      'bool': {
        'must': [],
        'must_not': [],
        'filter': [
          { 'range': { 'Avg Bit Rate': { 'lte': '128'}}}
        ]
      }
    },
    'sort': [ {
      '_script' : {
          'type' : 'number',
          'script' : {
              'lang': 'painless',
              'source': 'doc[\'Play Count\'].value / doc[\'Track Count\'].value'
          },
          'order' : 'desc'
      }
  }, {
    'Avg Bit Rate': {
      'order': 'asc'
    }
  } ],
    'size': 500
  }

  constructor(protected http: HttpClient) {
    super(http);
  }

  getAlbums(query: any): Observable<Album[]> {
    console.info('getAlbums');
    console.info(query);
    return this.http
      .post(this.elsUrl + ElsService.ALBUM_INDEX_NAME + ElsService.ACTION_SEARCH,
        JSON.stringify(query), {headers: this.headers})
      .pipe(
        map(res => this.responseToAlbums(res)),
        catchError(error => this.handleError(error, 'getAlbums'))
      );
  }

  getAlbumsFiltered(size: number): Observable<Album[]> {
    // http://localhost:9200/itunes-albums/_search
    console.info('getAlbums');
    return this.http
      .post(this.elsUrl + ElsService.ALBUM_INDEX_NAME + ElsService.ACTION_SEARCH,
        JSON.stringify({
          'sort': [ {
            'Avg Bit Rate': {
              'order': 'asc'
            }
          } ],
          'size': size,
          'query': {
            'bool': {
              'must': [],
              'filter': [
                {
                  'match_all': {}
                }
              ],
              'should': [],
              'must_not': [
                {
                  'match_phrase': {
                    'Artist': 'François Pérusse'
                  }
                },
                {
                  'match_phrase': {
                    'Album Artist': 'Comédiens'
                  }
                }
              ]
            }
          }
        }), {headers: this.headers})
      .pipe(
        map(res => this.responseToAlbums(res)),
        catchError(error => this.handleError(error, 'getAlbums'))
      );
  }
}