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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

package org.apache.eventmesh.runtime.admin.handler;

import org.apache.eventmesh.common.Constants;
import org.apache.eventmesh.common.utils.NetUtils;
import org.apache.eventmesh.runtime.admin.controller.HttpHandlerManager;
import org.apache.eventmesh.runtime.boot.EventMeshTCPServer;
import org.apache.eventmesh.runtime.common.EventHttpHandler;
import org.apache.eventmesh.runtime.core.protocol.tcp.client.EventMeshTcp2Client;
import org.apache.eventmesh.runtime.core.protocol.tcp.client.group.ClientSessionGroupMapping;
import org.apache.eventmesh.runtime.core.protocol.tcp.client.session.Session;

import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.sun.net.httpserver.HttpExchange;

@EventHttpHandler(path = "/clientManage/rejectAllClient")
public class RejectAllClientHandler extends AbstractHttpHandler {

    private static final Logger LOGGER = LoggerFactory.getLogger(RejectAllClientHandler.class);

    private final transient EventMeshTCPServer eventMeshTCPServer;

    public RejectAllClientHandler(final EventMeshTCPServer eventMeshTCPServer,
                                  final HttpHandlerManager httpHandlerManager) {
        super(httpHandlerManager);
        this.eventMeshTCPServer = eventMeshTCPServer;
    }

    /**
     * remove all clients accessed by eventMesh
     *
     * @param httpExchange
     * @throws IOException
     */
    @Override
    public void handle(final HttpExchange httpExchange) throws IOException {
        try (OutputStream out = httpExchange.getResponseBody()) {
            final ClientSessionGroupMapping clientSessionGroupMapping = eventMeshTCPServer.getClientSessionGroupMapping();
            final ConcurrentHashMap sessionMap = clientSessionGroupMapping.getSessionMap();
            final List successRemoteAddrs = new ArrayList<>();
            try {
                if (LOGGER.isInfoEnabled()) {
                    LOGGER.info("rejectAllClient in admin====================");
                }
                if (!sessionMap.isEmpty()) {
                    for (final Map.Entry entry : sessionMap.entrySet()) {
                        final InetSocketAddress addr = EventMeshTcp2Client.serverGoodby2Client(
                                eventMeshTCPServer, entry.getValue(), clientSessionGroupMapping);
                        if (addr != null) {
                            successRemoteAddrs.add(addr);
                        }
                    }
                }
            } catch (Exception e) {
                LOGGER.error("clientManage rejectAllClient fail", e);
                NetUtils.sendSuccessResponseHeaders(httpExchange);
                out.write(String.format("rejectAllClient fail! sessionMap size {%d}, had reject {%s}, errorMsg : %s",
                                sessionMap.size(), NetUtils.addressToString(successRemoteAddrs), e.getMessage())
                        .getBytes(Constants.DEFAULT_CHARSET));
                return;
            }
            NetUtils.sendSuccessResponseHeaders(httpExchange);
            out.write(String.format("rejectAllClient success! sessionMap size {%d}, had reject {%s}", sessionMap.size(),
                    NetUtils.addressToString(successRemoteAddrs)).getBytes(Constants.DEFAULT_CHARSET));
        } catch (Exception e) {
            LOGGER.error("rejectAllClient fail.", e);
        }
    }
}