/*
 * Copyright 2023 Conductor Authors.
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.netflix.conductor.contribs.queue.stan.config;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.env.Environment;
import org.springframework.lang.NonNull;

import com.netflix.conductor.contribs.queue.stan.NATSObservableQueue;
import com.netflix.conductor.core.events.EventQueueProvider;
import com.netflix.conductor.core.events.queue.ObservableQueue;

import rx.Scheduler;

/**
 * @author Oleksiy Lysak
 */
public class NATSEventQueueProvider implements EventQueueProvider {

    private static final Logger LOGGER = LoggerFactory.getLogger(NATSEventQueueProvider.class);

    protected Map<String, NATSObservableQueue> queues = new ConcurrentHashMap<>();
    private final Scheduler scheduler;

    public NATSEventQueueProvider(Environment environment, Scheduler scheduler) {
        this.scheduler = scheduler;
        LOGGER.info("NATS Event Queue Provider initialized...");
    }

    @Override
    public String getQueueType() {
        return "nats";
    }

    @Override
    @NonNull
    public ObservableQueue getQueue(String queueURI) {
        NATSObservableQueue queue =
                queues.computeIfAbsent(queueURI, q -> new NATSObservableQueue(queueURI, scheduler));
        if (queue.isClosed()) {
            queue.open();
        }
        return queue;
    }
}
