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package cn.ipokerface.aps.channel;

import cn.ipokerface.aps.Constant;
import cn.ipokerface.aps.ObjectFactory;
import cn.ipokerface.aps.auth.ApnsSignKey;
import cn.ipokerface.aps.handler.ApnsClientChannelHandler;
import cn.ipokerface.aps.handler.TokenAuthenticationClientChannelHandler;
import cn.ipokerface.aps.utils.ClientChannelClassUtil;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.*;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http2.Http2FrameLogger;
import io.netty.handler.flush.FlushConsolidationHandler;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslHandler;
import io.netty.handler.timeout.IdleStateHandler;
import io.netty.resolver.AddressResolverGroup;
import io.netty.util.ReferenceCounted;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.Promise;
import io.netty.util.concurrent.PromiseNotifier;

import java.io.Closeable;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.time.Duration;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Created by       PokerFace
 * Create Date      2020-08-24.
 * Email:           [email protected]
 * Version          1.0.0
 * 
 * Description:
 */
public class ChannelFactory implements ObjectFactory, Closeable {


    private static final long MIN_CONNECT_DELAY_SECONDS = 1;
    private static final long MAX_CONNECT_DELAY_SECONDS = 60;


    private SslContext                  sslContext;


    private Bootstrap                   bootstrap;
    private EventLoopGroup              eventLoopGroup;
    private AddressResolverGroup addressResolverGroup;
    private Duration                    connectTimeout;
    private InetSocketAddress           remoteAddress;


    private final AtomicLong            currentDelaySeconds = new AtomicLong(0);
    private final AtomicBoolean         releasedSslContenxt = new AtomicBoolean(false);


    public ChannelFactory(InetSocketAddress address,EventLoopGroup eventLoopGroup, SslContext sslContext, ApnsSignKey signKey,
                          Duration tokenExpiration, Duration connectTimeout, Duration idleInterval,
                          Http2FrameLogger logger, String defaultTopic) {

        this.remoteAddress = address;

        this.sslContext = sslContext;
        if (this.sslContext instanceof ReferenceCounted) {
            ((ReferenceCounted) this.sslContext).retain();
        }

        this.eventLoopGroup = eventLoopGroup;

//        this.addressResolverGroup =  new RoundRobinDnsAddressResolverGroup(
//                ClientChannelClassUtil.getDatagramChannelClass(eventLoopGroup),
//                DefaultDnsServerAddressStreamProvider.INSTANCE);
        this.bootstrap = new Bootstrap()
                    .option(ChannelOption.TCP_NODELAY, true)
//                    .option(ChannelOption.SO_KEEPALIVE, true)
//                    .resolver(addressResolverGroup)
                    .remoteAddress(remoteAddress)
                    .group(eventLoopGroup);

        if (connectTimeout != null) {
            this.bootstrap.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, (int) connectTimeout.toMillis());
        }


        this.bootstrap.handler(new ChannelInitializer() {
            @Override
            protected void initChannel(SocketChannel channel) {

                final SslHandler sslHandler = ChannelFactory.this.sslContext.newHandler(channel.alloc());
                final ApnsClientChannelHandler handler;
                final String authority = address.getHostName();
                final ApnsClientChannelHandler.ApnsClientChannelHandlerBuilder builder;
                if (signKey != null) {
                    builder = new TokenAuthenticationClientChannelHandler.TokenAuthenticationApnsClientHandlerBuilder()
                            .signingKey(signKey)
                            .tokenExpiration(tokenExpiration)
                            .authority(authority)
                            .defaultTopic(defaultTopic)
                            .idleInterval(idleInterval);
                } else {
                    builder = new ApnsClientChannelHandler.ApnsClientChannelHandlerBuilder()
                            .authority(authority)
                            .defaultTopic(defaultTopic)
                            .idleInterval(idleInterval);
                }

                if (logger != null) {
                    builder.frameLogger(logger);
                }

                handler = builder.build();


                final ChannelPipeline pipeline = channel.pipeline();

                pipeline.addLast(sslHandler);
                pipeline.addLast(new FlushConsolidationHandler(FlushConsolidationHandler.DEFAULT_EXPLICIT_FLUSH_AFTER_FLUSHES, true));
                pipeline.addLast(new IdleStateHandler(idleInterval.toMillis(), 0, 0, TimeUnit.MILLISECONDS));
                pipeline.addLast(handler);

            }
        });

    }

    @Override
    public Future create(Promise promise) {
        final long delay = this.currentDelaySeconds.get();

        promise.addListener(future -> {
            final long updatedDelay = future.isSuccess() ? 0 :
                    Math.max(Math.min(delay * 2, MAX_CONNECT_DELAY_SECONDS), MIN_CONNECT_DELAY_SECONDS);

            ChannelFactory.this.currentDelaySeconds.compareAndSet(delay, updatedDelay);
        });


        this.bootstrap.config().group().schedule(() -> {
            final Bootstrap bootstrap = ChannelFactory.this.bootstrap.clone()
                    .channelFactory(new AugmentingReflectiveChannelFactory(
                            ClientChannelClassUtil.getSocketChannelClass(ChannelFactory.this.bootstrap.config().group()),
                            Constant.channel_ready_promise_attribute_key, promise));

            final ChannelFuture connectFuture = bootstrap.connect();

            connectFuture.addListener(future -> {
                if (!future.isSuccess()) {
                    promise.tryFailure(future.cause());
                }
            });
        }, delay, TimeUnit.SECONDS);

        return promise;
    }



    @Override
    public Future destroy(Channel channel, Promise promise) {
        channel.close().addListener(new PromiseNotifier<>(promise));
        return promise;
    }


    @Override
    public void close() {
        try {
            this.addressResolverGroup.close();
        } finally {
            if (this.sslContext instanceof ReferenceCounted) {
                if (this.releasedSslContenxt.compareAndSet(false, true)) {
                    ((ReferenceCounted) this.sslContext).release();
                }
            }
        }
    }
}