/*
 * 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 uuid from 'uuid-js';
import md5 from 'md5';
import axios from 'axios';

import store from 'sdc-app/AppStore.js';
import {actionTypes as LoaderConstants} from 'nfvo-components/loader/LoaderConstants.js';
import Configuration from 'sdc-app/config/Configuration.js';
import errorResponseHandler from './ErrorResponseHandler.js';

//methods
const GET = 'GET';
const POST = 'POST';
const PUT = 'PUT';
const DELETE = 'DELETE';

// content-types
const APPLICATION_JSON = 'application/json';
const MULTIPART_FORM_DATA = 'multipart/form-data';

const BINARY = 'binary';

const AUTHORIZATION_HEADER = 'X-AUTH-TOKEN';
const STORAGE_AUTH_KEY = 'sdc-auth-token';
const REQUEST_ID_HEADER = 'X-ECOMP-RequestID';
const CONTENT_MD5_HEADER = 'Content-MD5';


function applySecurity(options, data) {
	let headers = options.headers || (options.headers = {});

	let authToken = localStorage.getItem(STORAGE_AUTH_KEY);
	if (authToken) {
		headers[AUTHORIZATION_HEADER] = authToken;
	}

	let attApiHeaders = Configuration.get('ATTApiHeaders'),
		attUidHeader = attApiHeaders && attApiHeaders.userId;
	if (attUidHeader) {
		headers[attUidHeader.name] = attUidHeader.value;
	}

	headers[REQUEST_ID_HEADER] = uuid.create().toString();
	if (options.md5) {
		let headers = options.headers;
		headers[CONTENT_MD5_HEADER] = window.btoa(md5(JSON.stringify(data)).toLowerCase());
	}
}


function handleSuccess(responseHeaders, requestHeaders) {
	let authToken = responseHeaders[AUTHORIZATION_HEADER];
	let prevToken = requestHeaders && requestHeaders[AUTHORIZATION_HEADER];
	if (authToken && authToken !== prevToken) {
		if (authToken === 'null') {
			localStorage.removeItem(STORAGE_AUTH_KEY);
		} else {
			localStorage.setItem(STORAGE_AUTH_KEY, authToken);
		}
	}
}

class RestAPIUtil  {
	handleRequest(url, type, options = {}, data){
		if (DEBUG) {
			console.log('axios --> Making REST call (' + type + '): ' + url);
		}

		applySecurity(options, data);

		// TODO see ig necessary or in transformrequest funtion
		if (type === POST || type === PUT) {
			if (data instanceof FormData) {
				options.headers.contentType = MULTIPART_FORM_DATA;
			}
			else {
				options.headers.contentType = APPLICATION_JSON;
//				config.data = JSON.stringify(data);
			}

		} else {
			data = null;
		}

		let config = {
			method: type,
			url: url,
			headers : options.headers,
			data : data
		};

		store.dispatch({type: LoaderConstants.SEND_REQUEST, url: url});
		if (options.dataType === BINARY) {
			config.responseType = 'arraybuffer';
			return axios(config).
			then(result => {
				store.dispatch({type: LoaderConstants.RECEIVE_RESPONSE, url : result.config.url});
				return ({
					blob : new Blob([result.data] ),
					headers : result.headers
				});
			}).catch(error => {
				store.dispatch({type: LoaderConstants.RECEIVE_RESPONSE, url : error.config.url});
				errorResponseHandler(error.response); });
		} else {
			return axios(config).
			then(result => {
				store.dispatch({type: LoaderConstants.RECEIVE_RESPONSE, url : result.config.url});
				handleSuccess(result.headers, result.config.headers);
				return result.data;
			}).catch(error => {
				store.dispatch({type: LoaderConstants.RECEIVE_RESPONSE, url : error.config.url});
				errorResponseHandler(error.response);
				throw {responseJSON: error.response.data};
			});
		}

	}

	fetch(url, options) {
		return this.handleRequest(url, GET, options);
	}

	get(url, options) {
		return this.fetch(url, options);
	}

	post(url, data, options) {
		return this.handleRequest(url, POST, options, data);
	}

	put(url, data, options) {
		return this.handleRequest(url, PUT, options, data);
	}

	destroy(url, options) {
		return this.handleRequest(url, DELETE, options);
	}


}

const instance = new RestAPIUtil();


export default instance;