/*
 * Copyright © 2016-2017 European Support Limited
 *
 * 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 './LoaderConstants.js';

export default (state = {fetchingRequests : 0, currentlyFetching : [],  isLoading : false}, action) => {
	let fetchingRequests = state.fetchingRequests;
	let newArray;
	switch (action.type) {
		case actionTypes.SEND_REQUEST:
			fetchingRequests++;
			newArray = state.currentlyFetching.slice();
			newArray.splice(0, 0, action.url);
			if (DEBUG) {
				console.log('Loader SEND REQUEST url: ' + action.url);
				console.log('Loader SEND REQUEST number of fetching requests: ' + fetchingRequests);
			}
			return {
				fetchingRequests: fetchingRequests,
				currentlyFetching : newArray,
				isLoading: true
			};
		case actionTypes.RECEIVE_RESPONSE:
			fetchingRequests--;

			newArray = state.currentlyFetching.filter((item) => {return item !== action.url;});
			if (DEBUG) {
				console.log('Loader RECEIVE_RESPONSE url: ' + action.url);
				console.log('Loader RECEIVE_RESPONSE: number of fetching requests: ' + fetchingRequests);
			}
			return {
				currentlyFetching : newArray,
				fetchingRequests: fetchingRequests,
				isLoading: (fetchingRequests !== 0)
			};
		case actionTypes.SHOW:
			return {isLoading: true};
		case actionTypes.HIDE:
			return {isLoading: false};
		default:
			return state;
	}
};