import {createSelector} from "reselect";
import {IrisClientType} from "..";
import {IrisState} from "./iris.reducer";

const getIrisState = (state):IrisState => state.iris;

export const getUser = createSelector(
  [getIrisState],
  state => {
      return state.user
  }
);

export const getUserJwt = createSelector(
  [getUser],
  user => {
    if (user) {
      return user.jwt;
    }
    throw new Error("User is not logged");
  }
);

export const isLoggedIn = createSelector(
  [getUser],
  Boolean
);

export const getIrisChannel = createSelector(
  [getIrisState],
  state => state.channel
);

export const getIrisSubject = createSelector(
  [getIrisState],
  state => state.subject
);


export const getIrisSimChannel = createSelector(
    [getIrisState],
    state => state.simChannel
);


export const getIrisConnectMessage = (client: IrisClientType) => createSelector(
  [getIrisChannel],
  channel => (channel ? client.messageBuilder.irisConnectMessage(channel) : null)
);

export const selectors = {
  getUser: getUser,
  isLoggedIn: isLoggedIn,
  getIrisSubject: getIrisSubject,
  getIrisChannel: getIrisChannel,
  getIrisConnectMessage: getIrisConnectMessage,
  getUserJwt: getUserJwt,
  getIrisSimChannel: getIrisSimChannel
};