import {Injectable} from '@angular/core';
import {Squad} 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 SquadService {

  squads$: Observable<Squad[]>;

  squadStore = new Store<Squad>();

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

  findSquads(query = '', fractionFilter = ''): Observable<Squad[]> {
    const searchParams = new HttpParams().append('q', query)
                                         .append('fractFilter', fractionFilter);

    this.httpGateway.get(this.config.apiSquadPath, searchParams)
        .do((squads) => {
          this.squadStore.dispatch({type: LOAD, data: squads});
        }).subscribe(_ => {
    });

    return this.squads$;
  }

  getSquad(id: number | string): Observable<Squad> {
    return this.httpGateway.get<Squad>(this.config.apiSquadPath + id);
  }

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

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

    if (imageFile) {
      body = new FormData();
      Object.keys(squad).map((objectKey) => {
        if (squad[objectKey] !== undefined) {
          body.append(objectKey, squad[objectKey]);
        }
      });
      body.append('image', imageFile, imageFile.name);
    } else {
      body = squad;
    }

    return this.httpGateway.request<Squad>(requestUrl, body, requestMethod)
               .do(savedSquad => {
                 const action = {type: accessType, data: savedSquad};
                 this.squadStore.dispatch(action);
               });
  }

  deleteSquad(squad: Squad) {
    return this.httpGateway.delete(this.config.apiSquadPath + squad._id)
               .do(res => {
                 this.squadStore.dispatch({type: REMOVE, data: squad});
               });
  }
}