/*
 * The MIT License (MIT)
 *
 * Copyright © 2020 xrv <xrg@live.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package io.github.ehlxr.did.server;

import io.github.ehlxr.did.common.Try;
import io.github.ehlxr.did.generator.SnowFlake;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.DefaultEventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author ehlxr
 */
public abstract class BaseServer implements Server {
    protected Logger logger = LoggerFactory.getLogger(BaseServer.class);

    protected DefaultEventLoopGroup defLoopGroup;
    protected NioEventLoopGroup bossGroup;
    protected NioEventLoopGroup workGroup;
    protected ChannelFuture channelFuture;
    protected ServerBootstrap serverBootstrap;
    protected SnowFlake snowFlake;

    protected void init() {
        defLoopGroup = new DefaultEventLoopGroup(Runtime.getRuntime().availableProcessors(), new ThreadFactory() {
            private final AtomicInteger index = new AtomicInteger(0);

            @Override
            public Thread newThread(Runnable r) {
                return new Thread(r, "DEFAULTEVENTLOOPGROUP_" + index.incrementAndGet());
            }
        });
        bossGroup = new NioEventLoopGroup(1, new ThreadFactory() {
            private final AtomicInteger index = new AtomicInteger(0);

            @Override
            public Thread newThread(Runnable r) {
                return new Thread(r, "BOSS_" + index.incrementAndGet());
            }
        });
        workGroup = new NioEventLoopGroup(new ThreadFactory() {
            private final AtomicInteger index = new AtomicInteger(0);

            @Override
            public Thread newThread(Runnable r) {
                return new Thread(r, "WORK_" + index.incrementAndGet());
            }
        });

        serverBootstrap = new ServerBootstrap()
                .group(bossGroup, workGroup)
                .channel(NioServerSocketChannel.class)
                // .option(ChannelOption.SO_KEEPALIVE, true)
                // .option(ChannelOption.TCP_NODELAY, true)
                // .localAddress(new InetSocketAddress(port))
                .option(ChannelOption.SO_BACKLOG, 1024);
    }

    @Override
    public void shutdown() {
        Try.of(() -> {
            // 同步阻塞 shutdownGracefully 完成
            if (defLoopGroup != null) {
                defLoopGroup.shutdownGracefully().sync();
            }
            bossGroup.shutdownGracefully().sync();
            workGroup.shutdownGracefully().sync();
        }).trap(e -> logger.error("Server EventLoopGroup shutdown error.", e)).run();
    }
}