sample service

class SlotService {
  /*@ngInject*/
  constructor($http,CONFIG_CONSTANTS,$q, AuthService) {
    this.API_URL = CONFIG_CONSTANTS.API_URL;
    this.$http = $http;
    this.$q = $q;
    this.api_token = AuthService.api_token;
  }

  getSlotList(floorId) {
    const deferred = this.$q.defer();
    this.$http.get(`${this.API_URL}/floor/${floorId}/slot?api_token=${this.api_token}`)
          .success(response => deferred.resolve(response))
          .error(error =>  deferred.reject(error));
    return deferred.promise;
  }

  addSlots(payload) {
    const deferred = this.$q.defer();
    this.$http.post(`${this.API_URL}/floor/${payload.floorId}/slot?api_token=${this.api_token}`, payload)
          .success(response => deferred.resolve(response))
          .error(error =>  deferred.reject(error));
    return deferred.promise;
  }

  updateSlot(payload) {
    const deferred = this.$q.defer();
    this.$http.post(`${this.API_URL}/floor/${payload.floorId}/slot/${payload.slotId}?api_token=${this.api_token}`, payload)
          .success(response => deferred.resolve(response))
          .error(error =>  deferred.reject(error));
    return deferred.promise;
  }
}

SlotService.$inject = [
  '$http',
  'CONFIG_CONSTANTS',
  '$q',
  'AuthService'
];

export default SlotService;