/*
 * 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.rocketmq.namesrv;

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.joran.JoranConfigurator;
import ch.qos.logback.core.joran.spi.JoranException;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.concurrent.Callable;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.PosixParser;
import org.apache.rocketmq.common.MQVersion;
import org.apache.rocketmq.common.MixAll;
import org.apache.rocketmq.common.constant.LoggerName;
import org.apache.rocketmq.logging.InternalLogger;
import org.apache.rocketmq.logging.InternalLoggerFactory;
import org.apache.rocketmq.common.namesrv.NamesrvConfig;
import org.apache.rocketmq.remoting.netty.NettyServerConfig;
import org.apache.rocketmq.remoting.protocol.RemotingCommand;
import org.apache.rocketmq.srvutil.ServerUtil;
import org.apache.rocketmq.srvutil.ShutdownHookThread;
import org.slf4j.LoggerFactory;

public class NamesrvStartup {

    private static InternalLogger log;
    private static Properties properties = null;
    private static CommandLine commandLine = null;

    public static void main(String[] args) {
        main0(args);
    }

    public static NamesrvController main0(String[] args) {

        try {
            // 第一步：创建controller
            NamesrvController controller = createNamesrvController(args);
            // 第二步：启动
            start(controller);
            String tip = "The Name Server boot success. serializeType=" + RemotingCommand.getSerializeTypeConfigInThisServer();
            log.info(tip);
            System.out.printf("%s%n", tip);
            return controller;
        } catch (Throwable e) {
            e.printStackTrace();
            System.exit(-1);
        }

        return null;
    }

    /**
     * 创建controller
     */
    public static NamesrvController createNamesrvController(String[] args) throws IOException, JoranException {
        // 设置版本信息
        System.setProperty(RemotingCommand.REMOTING_VERSION_KEY, Integer.toString(MQVersion.CURRENT_VERSION));

        // 1. 解析命令行代码
        // 维护了一个options list，会把这些参数解析进去（-h情况下会终止执行，返回各个参数的说明）
        // eg：-c D:\code\opensource\rocketmq\conf\xxxx.conf
        Options options = ServerUtil.buildCommandlineOptions(new Options());
        commandLine = ServerUtil.parseCmdLine("mqnamesrv", args, buildCommandlineOptions(options), new PosixParser());
        if (null == commandLine) {// -h 情况下 commandLine == null，终止进程
            System.exit(-1);
            return null;
        }

        // nameServer的相关配置
        final NamesrvConfig namesrvConfig = new NamesrvConfig();
        // nettyServer的相关配置
        final NettyServerConfig nettyServerConfig = new NettyServerConfig();
        nettyServerConfig.setListenPort(9876);// nettyServer的端口固定为9876，其他项目不要跟这个冲突了

        // 解析配置命令选项 'c'，解析文件，将参数信息解析到properties里面
        if (commandLine.hasOption('c')) {
            String file = commandLine.getOptionValue('c');
            if (file != null) {
                InputStream in = new BufferedInputStream(new FileInputStream(file));
                properties = new Properties();
                properties.load(in);
                MixAll.properties2Object(properties, namesrvConfig);
                MixAll.properties2Object(properties, nettyServerConfig);

                namesrvConfig.setConfigStorePath(file);

                System.out.printf("load config properties file OK, %s%n", file);
                in.close();
            }
        }

        // 处理-p 参数，用于打印namesrvConfig、nettyServerConfig配置信息（打印后直接exit终止）
        if (commandLine.hasOption('p')) {
            InternalLogger console = InternalLoggerFactory.getLogger(LoggerName.NAMESRV_CONSOLE_NAME);
            MixAll.printObjectProperties(console, namesrvConfig);
            MixAll.printObjectProperties(console, nettyServerConfig);
            System.exit(0);
        }

        // 将 commandLine 的所有配置设置到 namesrvConfig 中（将properties中属性赋予namesrvConfig中）
        /*************************************************************************************
         * 1. 先获取到object中的所有setXxx(...)方法
         * 2. 得到setXxx(...)中的Xxx
         * 3. 首字母小写得到xxx
         * 4. 从properties获取xxx属性对应的值，并根据setXxx(...)方法的参数类型进行转换
         * 5. 反射调用setXxx(...)方法进行赋值
         ************************************************************************************/
        MixAll.properties2Object(ServerUtil.commandLine2Properties(commandLine), namesrvConfig);

        // 如果不设置 ROCKETMQ_HOME，就会在这里报错
        if (null == namesrvConfig.getRocketmqHome()) {
            System.out.printf("Please set the %s variable in your environment to match the location of the RocketMQ installation%n", MixAll.ROCKETMQ_HOME_ENV);
            System.exit(-2);
        }

        // 加载日志配置
        LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
        JoranConfigurator configurator = new JoranConfigurator();
        configurator.setContext(lc);
        lc.reset();
        configurator.doConfigure(namesrvConfig.getRocketmqHome() + "/conf/logback_namesrv.xml");

        log = InternalLoggerFactory.getLogger(LoggerName.NAMESRV_LOGGER_NAME);
        // 这里作用只是为了输出一些参数属性日志
        MixAll.printObjectProperties(log, namesrvConfig);
        MixAll.printObjectProperties(log, nettyServerConfig);

        // 将namesrvConfig, nettyServerConfig传入，其实只是为了创建一个controller实例用于后面启动用
        final NamesrvController controller = new NamesrvController(namesrvConfig, nettyServerConfig);

        // 将所有配置记录下来，避免忘记       remember all configs to prevent discard
        controller.getConfiguration().registerConfig(properties);

        return controller;
    }

    public static NamesrvController start(final NamesrvController controller) throws Exception {

        if (null == controller) {
            throw new IllegalArgumentException("NamesrvController is null");
        }

        /************************************************
         * 初始化，主要做如下两件事
         * 1. 处理netty相关：创建远程服务与工作线程
         * 2. 开启定时任务：移除不活跃的broker
         ***********************************************/
        boolean initResult = controller.initialize();
        if (!initResult) {
            controller.shutdown();
            System.exit(-3);
        }

        // 添加一个关闭钩子
        Runtime.getRuntime().addShutdownHook(new ShutdownHookThread(log, (Callable<Void>) () -> {
            controller.shutdown();
            return null;
        }));

        // 真正执行启动的地方
        controller.start();

        return controller;
    }

    public static void shutdown(final NamesrvController controller) {
        controller.shutdown();
    }

    public static Options buildCommandlineOptions(final Options options) {
        Option opt = new Option("c", "configFile", true, "Name server config properties file");
        opt.setRequired(false);
        options.addOption(opt);

        opt = new Option("p", "printConfigItem", false, "Print all config item");
        opt.setRequired(false);
        options.addOption(opt);

        return options;
    }

    public static Properties getProperties() {
        return properties;
    }
}