/*
 * Copyright (c) 2015 Spotify AB.
 *
 * 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 com.spotify.heroic.consumer.collectd;

import eu.toolchain.async.AsyncFramework;
import eu.toolchain.async.AsyncFuture;
import eu.toolchain.async.ResolvableFuture;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioDatagramChannel;
import java.net.InetAddress;

public class Server {
    private final AsyncFramework async;

    private Server(AsyncFramework async, @Deprecated Channel channel) {
        this.async = async;
    }

    public AsyncFuture<Void> start() {
        return async.resolved();
    }

    public AsyncFuture<Void> shutdown() {
        return async.resolved();
    }

    static AsyncFuture<Server> setup(
        final AsyncFramework async, final CollectdChannelHandler handler, final InetAddress host,
        final int port
    ) {
        final EventLoopGroup group = new NioEventLoopGroup();
        final Bootstrap b = new Bootstrap();

        b
            .group(group)
            .channel(NioDatagramChannel.class)
            .option(ChannelOption.SO_BROADCAST, true)
            .handler(handler);

        final ResolvableFuture<Server> future = async.future();

        b.bind(host, port).addListener((ChannelFutureListener) f -> {
            if (f.isSuccess()) {
                future.resolve(new Server(async, f.channel()));
            } else {
                future.fail(
                    f.cause() != null ? f.cause() : new RuntimeException("Failed to bind"));
            }
        });

        return future;
    }
}