import {Injectable} from '@angular/core';
import {Rank} from '../../models/model-interfaces';
import {Observable} from 'rxjs/Observable';
import {ADD, EDIT, LOAD, REMOVE, Store} from '../stores/generic-store';
import {AppConfig} from '../../app.config';
import {HttpGateway, HttpMethod} from '../http-gateway';
import {HttpParams} from '@angular/common/http';

@Injectable()
export class RankService {

  ranks$: Observable<Rank[]>;

  rankStore = new Store<Rank>();

  constructor(private httpGateway: HttpGateway,
              private config: AppConfig) {
    this.ranks$ = this.rankStore.items$;
  }

  findRanks(query = '', fractionFilter?): Observable<Rank[]> {
    let searchParams = new HttpParams().append('q', query);
    if (fractionFilter) {
      searchParams = searchParams.append('fractFilter', fractionFilter);
    }

    this.httpGateway.get<Rank[]>(this.config.apiRankPath, searchParams)
        .do((ranks) => {
          this.rankStore.dispatch({type: LOAD, data: ranks});
        }).subscribe(_ => {
    });

    return this.ranks$;
  }

  getRank(id: number | string): Observable<Rank> {
    return this.httpGateway.get<Rank>(this.config.apiRankPath + id);
  }

  /**
   * For creating new data with POST or
   * update existing with patch PATCH
   */
  submitRank(rank: Rank, imageFile?): Observable<Rank> {
    let requestUrl = this.config.apiRankPath;
    let requestMethod: HttpMethod;
    let accessType;
    let body;

    if (rank._id) {
      requestUrl += rank._id;
      requestMethod = 'PATCH';
      accessType = EDIT;
    } else {
      requestMethod = 'POST';
      accessType = ADD;
    }

    if (imageFile) {
      body = new FormData();
      Object.keys(rank).map((objectKey) => {
        if (rank[objectKey] !== undefined) {
          body.append(objectKey, rank[objectKey]);
        }
      });

      body.append('image', imageFile, imageFile.name);
    } else {
      body = rank;
    }

    return this.httpGateway.request<Rank>(requestUrl, body, requestMethod)
               .do(savedRank => {
                 const action = {type: accessType, data: savedRank};
                 // leave some time to save image file before accessing it through list view
                 setTimeout(() => {
                   this.rankStore.dispatch(action);
                 }, 300);
               });
  }

  deleteRank(rank: Rank) {
    return this.httpGateway.delete(this.config.apiRankPath + rank._id)
               .do(res => {
                 this.rankStore.dispatch({type: REMOVE, data: rank});
               });
  }
}