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/*
  Copyright (C) 2013-2019 Expedia Inc.

  Licensed 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.hotels.styx.server.netty;

import com.hotels.styx.api.HttpHandler;
import com.hotels.styx.api.LiveHttpResponse;
import com.hotels.styx.api.MetricRegistry;
import com.hotels.styx.api.Eventual;
import com.hotels.styx.server.HttpServer;
import com.hotels.styx.server.ServerEventLoopFactory;
import com.hotels.styx.server.netty.eventloop.PlatformAwareServerEventLoopFactory;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.ImmediateEventExecutor;

import java.util.List;
import java.util.Optional;
import java.util.function.Supplier;

import static com.google.common.base.Objects.firstNonNull;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.collect.Lists.newCopyOnWriteArrayList;
import static com.hotels.styx.api.HttpResponseStatus.NOT_FOUND;
import static com.hotels.styx.server.netty.eventloop.ServerEventLoopFactories.memoize;
import static java.util.Arrays.asList;

/**
 * A builder of {@link NettyServer} instances.
 */
public final class NettyServerBuilder {
    private final ChannelGroup channelGroup = new DefaultChannelGroup(ImmediateEventExecutor.INSTANCE);
    private ServerEventLoopFactory serverEventLoopFactory;

    private String host;
    private MetricRegistry metricRegistry;
    private String name = "styx";
    private Optional httpConnector = Optional.empty();
    private Optional httpsConnector = Optional.empty();
    private final List startupActions = newCopyOnWriteArrayList();
    private Supplier handlerFactory = () -> (request, context) -> Eventual.of(LiveHttpResponse.response(NOT_FOUND).build());

    public static NettyServerBuilder newBuilder() {
        return new NettyServerBuilder();
    }

    String host() {
        return firstNonNull(host, "localhost");
    }

    public NettyServerBuilder host(String host) {
        this.host = host;
        return this;
    }

    public NettyServerBuilder name(String name) {
        this.name = name;
        return this;
    }

    public NettyServerBuilder setMetricsRegistry(MetricRegistry metricRegistry) {
        this.metricRegistry = metricRegistry;
        return this;
    }

    MetricRegistry metricsRegistry() {
        return this.metricRegistry;
    }

    public NettyServerBuilder setServerEventLoopFactory(ServerEventLoopFactory serverEventLoopFactory) {
        this.serverEventLoopFactory = serverEventLoopFactory;
        return this;
    }

    ServerEventLoopFactory serverEventLoopFactory() {
        return firstNonNull(this.serverEventLoopFactory, memoize(new PlatformAwareServerEventLoopFactory(name, 1, 1)));
    }

    public ChannelGroup channelGroup() {
        return this.channelGroup;
    }

    public NettyServerBuilder handlerFactory(Supplier handlerFactory) {
        this.handlerFactory = handlerFactory;
        return this;
    }

    Supplier handlerFactory() {
        return this.handlerFactory;
    }

    public NettyServerBuilder setHttpConnector(ServerConnector connector) {
        this.httpConnector = Optional.of(connector);
        return this;
    }

    public NettyServerBuilder setHttpsConnector(ServerConnector connector) {
        this.httpsConnector = Optional.of(connector);
        return this;
    }

    Optional httpConnector() {
        return httpConnector;
    }

    Optional httpsConnector() {
        return httpsConnector;
    }

    public NettyServerBuilder doOnStartUp(Runnable... startupActions) {
        this.startupActions.addAll(asList(startupActions));
        return this;
    }

    Iterable startupActions() {
        return startupActions;
    }

    public HttpServer build() {
        checkArgument(httpConnector.isPresent() || httpsConnector.isPresent(), "Must configure at least one connector");

        return new NettyServer(this);
    }
}