import { Map as ImmutableMap, Record as ImmutableRecord } from 'immutable';

import { SET_BROWSER_SUPPORT, SET_SUBSCRIPTION, CLEAR_SUBSCRIPTION, SET_ALERTS } from '../actions/push-notifications';

import type { AnyAction } from 'redux';

const SubscriptionRecord = ImmutableRecord({
  id: '',
  endpoint: '',
});

const ReducerRecord = ImmutableRecord({
  subscription: null as Subscription | null,
  alerts: ImmutableMap<string, boolean>({
    follow: true,
    follow_request: true,
    favourite: true,
    reblog: true,
    mention: true,
    poll: true,
  }),
  isSubscribed: false,
  browserSupport: false,
});

type Subscription = ReturnType<typeof SubscriptionRecord>;

export default function push_subscriptions(state = ReducerRecord(), action: AnyAction) {
  switch (action.type) {
    case SET_SUBSCRIPTION:
      return state
        .set('subscription', SubscriptionRecord({
          id: action.subscription.id,
          endpoint: action.subscription.endpoint,
        }))
        .set('alerts', ImmutableMap(action.subscription.alerts))
        .set('isSubscribed', true);
    case SET_BROWSER_SUPPORT:
      return state.set('browserSupport', action.value);
    case CLEAR_SUBSCRIPTION:
      return ReducerRecord();
    case SET_ALERTS:
      return state.setIn(action.path, action.value);
    default:
      return state;
  }
}