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/*!
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

import { actionTypes } from './UserNotificationsConstants.js';

export default (state = {}, action) => {
    switch (action.type) {
        case actionTypes.NOTIFICATION:
            let list = state.notificationsList ? state.notificationsList : [];
            const { notifications, lastScanned } = action.data;
            return {
                ...state,
                lastScanned,
                notificationsList: [...notifications, ...list],
                numOfNotSeenNotifications:
                    state.numOfNotSeenNotifications + notifications.length
            };
        case actionTypes.LOAD_NOTIFICATIONS:
            return {
                ...state,
                ...action.result,
                notificationsList: action.result.notifications,
                notifications: undefined
            };
        case actionTypes.LOAD_PREV_NOTIFICATIONS:
            const {
                notifications: prevNotifications,
                endOfPage: newEndOfPage
            } = action.result;
            return {
                ...state,
                notificationsList: [
                    ...state.notificationsList,
                    ...prevNotifications
                ],
                endOfPage: newEndOfPage
            };
        case actionTypes.UPDATE_READ_NOTIFICATION:
            let { notificationForUpdate } = action;
            notificationForUpdate = { ...notificationForUpdate, read: true };
            const indexForEdit = state.notificationsList.findIndex(
                notification =>
                    notification.eventId === notificationForUpdate.eventId
            );
            return {
                ...state,
                notificationsList: [
                    ...state.notificationsList.slice(0, indexForEdit),
                    notificationForUpdate,
                    ...state.notificationsList.slice(indexForEdit + 1)
                ]
            };
        case actionTypes.RESET_NEW_NOTIFICATIONS:
            return {
                ...state,
                numOfNotSeenNotifications: 0
            };
        case actionTypes.TOGGLE_OVERLAY:
            return {
                ...state,
                showNotificationsOverlay: action.showNotificationsOverlay
            };
        default:
            return state;
    }
};