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/**
 * Copyright (C) 2015 The Gravitee team (http://gravitee.io)
 *
 * 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 io.gravitee.node.cluster.standalone;

import io.gravitee.node.api.message.Message;
import io.gravitee.node.api.message.Topic;
import io.vertx.core.Future;
import io.vertx.core.Handler;
import io.vertx.core.Promise;
import io.vertx.core.Vertx;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.eventbus.DeliveryOptions;
import io.vertx.core.eventbus.MessageCodec;
import io.vertx.core.eventbus.MessageConsumer;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author Kamiel Ahmadpour (kamiel.ahmadpour at graviteesource.com)
 * @author GraviteeSource Team
 */
public class StandaloneTopic implements Topic {

    private final Vertx vertx;
    private final String topicName;
    Map> consumerMap = new ConcurrentHashMap<>();
    private static final List messageCodecs = new ArrayList<>();

    public StandaloneTopic(Vertx vertx, String topicName) {
        this.vertx = vertx;
        this.topicName = topicName;

        if (!messageCodecs.contains(topicName)) {
            messageCodecs.add(topicName);

            vertx
                .eventBus()
                .registerCodec(
                    new MessageCodec() {
                        // Will not be used for local transformations
                        @Override
                        public void encodeToWire(Buffer buffer, T o) {}

                        // Will not be used for local transformations
                        @Override
                        public T decodeFromWire(int pos, Buffer buffer) {
                            return null;
                        }

                        @Override
                        public T transform(T o) {
                            return o;
                        }

                        @Override
                        public String name() {
                            return topicName;
                        }

                        @Override
                        public byte systemCodecID() {
                            return -1;
                        }
                    }
                );
        }
    }

    @Override
    public void publish(T event) {
        DeliveryOptions deliveryOptions = new DeliveryOptions();
        deliveryOptions.setCodecName(topicName);

        vertx.eventBus().publish(topicName, event, deliveryOptions);
    }

    @Override
    public UUID addMessageConsumer(io.gravitee.node.api.message.MessageConsumer messageConsumer) {
        UUID uuid = io.gravitee.common.utils.UUID.random();

        MessageConsumer vertxConsumer = vertx.eventBus().consumer(topicName);
        consumerMap.put(uuid, vertxConsumer);

        vertxConsumer.handler(event ->
            vertx.executeBlocking(
                (Handler>) promise -> {
                    messageConsumer.onMessage(new Message<>(topicName, event.body()));
                    promise.handle(null);
                }
            )
        );

        return uuid;
    }

    @Override
    public boolean removeMessageConsumer(UUID uuid) {
        if (!consumerMap.containsKey(uuid)) {
            return false;
        } else {
            Future unregister = consumerMap.get(uuid).unregister();

            if (unregister.succeeded()) {
                consumerMap.remove(uuid);
                return true;
            } else {
                return false;
            }
        }
    }
}