import { Selector, createSelector } from '@ngrx/store';
import { EntityState, createEntityAdapter } from '@ngrx/entity';
import { UserInfo } from '@ucap/protocol-sync';

export interface BuddyState extends EntityState<UserInfo> {
  syncDate: string;
}
export const adapterBuddy = createEntityAdapter<UserInfo>({
  selectId: userInfo => userInfo.seq
});

export interface State {
  buddies: BuddyState;
}

const buddyInitialState: BuddyState = adapterBuddy.getInitialState({
  syncDate: ''
});

export const initialState: State = {
  buddies: buddyInitialState
};

const {
  selectAll: selectAllForBuddy,
  selectEntities: selectEntitiesForBuddy,
  selectIds: selectIdsForBuddy,
  selectTotal: selectTotalForBuddy
} = adapterBuddy.getSelectors();

export function selectors<S>(selector: Selector<any, State>) {
  const selectBuddies = createSelector(
    selector,
    (state: State) => state.buddies
  );

  return {
    buddies: createSelector(selectBuddies, selectAllForBuddy),
    buddySyncDate: createSelector(
      selectBuddies,
      buddyState => buddyState.syncDate
    )
  };
}