/*

 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

package com.oracle.jmx.remote.rest.http;

import com.oracle.jmx.remote.rest.json.JSONArray;

import com.oracle.jmx.remote.rest.json.JSONObject;

import com.sun.net.httpserver.HttpExchange;

import com.sun.net.httpserver.HttpServer;

import javax.management.remote.rest.PlatformRestAdapter;

import java.io.UnsupportedEncodingException;

import java.net.HttpURLConnection;

import java.util.List;

/**

 * This class handles all the HTTP requests for the base URL

 * for REST adapter.

 */

public class MBeanServerCollectionResource implements RestResource {

    private final List<MBeanServerResource> restAdapters;

    private final int pageSize = 5;

    public MBeanServerCollectionResource(List<MBeanServerResource> adapters, HttpServer server) {

        this.restAdapters = adapters;

        server.createContext("/jmx/servers", this);

    }

    @Override

    public HttpResponse doGet(HttpExchange exchange) {

        try {

            JSONObject _links = HttpUtil.getPaginationLinks(exchange, restAdapters, pageSize);

            List<MBeanServerResource> filteredList = HttpUtil.filterByPage(exchange, restAdapters, pageSize);

            if (filteredList == null) {

                return HttpResponse.OK;

            }

            JSONObject root = new JSONObject();

            if (_links != null && !_links.isEmpty()) {

                root.put("_links", _links);

            }

            root.put("mBeanServerCount", Integer.toString(restAdapters.size()));

            JSONArray list = new JSONArray();

            filteredList.stream().map((adapter) -> {

                JSONObject result = new JSONObject();

                result.put("name", adapter.getContext());

                result.put("href", path + "/" + adapter.getContext());

                return result;

            }).forEachOrdered((result) -> {

                list.add(result);

            });

            root.put("mBeanServers", list);

            return new HttpResponse(HttpURLConnection.HTTP_OK, root.toJsonString());

        } catch (UnsupportedEncodingException e) {

            return new HttpResponse(HttpResponse.BAD_REQUEST,

                    HttpUtil.getRequestCharset(exchange) + " is not supported");

        }

    }

}