/*-
 * ============LICENSE_START=======================================================
 * PROJECT
 * ================================================================================
 * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.dcae;

import io.vavr.collection.Map;
import java.nio.file.Paths;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.onap.dcae.common.EventSender;
import org.onap.dcae.common.publishing.DMaaPConfigurationParser;
import org.onap.dcae.common.publishing.EventPublisher;
import org.onap.dcae.common.publishing.PublisherConfig;
import org.onap.dcae.controller.ConfigLoader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration;
import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Lazy;

@SpringBootApplication(exclude = {GsonAutoConfiguration.class, SecurityAutoConfiguration.class})
public class VesApplication {

    private static final Logger incomingRequestsLogger = LoggerFactory.getLogger("org.onap.dcae.common.input");
    private static final Logger oplog = LoggerFactory.getLogger("org.onap.dcae.common.output");
    private static final Logger errorLog = LoggerFactory.getLogger("org.onap.dcae.common.error");
    private static ApplicationSettings properties;
    private static ConfigurableApplicationContext context;
    private static ConfigLoader configLoader;
    private static ScheduledThreadPoolExecutor scheduledThreadPoolExecutor;
    private static SpringApplication app;
    private static EventPublisher eventPublisher;
    private static ScheduledFuture<?> scheduleFeatures;

    public static void main(String[] args) {
      app = new SpringApplication(VesApplication.class);
      properties = new ApplicationSettings(args, CLIUtils::processCmdLine);
      scheduledThreadPoolExecutor = new ScheduledThreadPoolExecutor(1);
      init();
      app.setAddCommandLineProperties(true);
      context = app.run();
      configLoader.updateConfig();
    }

    public static void restartApplication() {
      Thread thread = new Thread(() -> {
        context.close();
        properties.reloadProperties();
        scheduleFeatures.cancel(true);
        init();
        context = SpringApplication.run(VesApplication.class);
      });
      thread.setDaemon(false);
      thread.start();
    }

    private static void init() {
      createConfigLoader();
      createSchedulePoolExecutor();
      createExecutors();
    }

    private static void createExecutors() {
      eventPublisher = EventPublisher.createPublisher(oplog, getDmapConfig());
    }

    private static void createSchedulePoolExecutor() {
      scheduleFeatures = scheduledThreadPoolExecutor.scheduleAtFixedRate(configLoader::updateConfig,
          properties.configurationUpdateFrequency(),
          properties.configurationUpdateFrequency(),
          TimeUnit.MINUTES);
    }

    private static void createConfigLoader() {
      configLoader = ConfigLoader.create(getEventPublisher()::reconfigure,
          Paths.get(properties.dMaaPConfigurationFileLocation()),
          properties.configurationFileLocation());
    }


    private static EventPublisher getEventPublisher() {
      return EventPublisher.createPublisher(oplog, DMaaPConfigurationParser
          .parseToDomainMapping(Paths.get(properties.dMaaPConfigurationFileLocation())).get());
    }

    private static Map<String, PublisherConfig> getDmapConfig() {
      return DMaaPConfigurationParser
          .parseToDomainMapping(Paths.get(properties.dMaaPConfigurationFileLocation())).get();
    }

    @Bean
    @Lazy
    public ApplicationSettings applicationSettings() {
        return properties;
    }

    @Bean
    @Qualifier("incomingRequestsLogger")
    public Logger incomingRequestsLogger() {
        return incomingRequestsLogger;
    }

    @Bean
    @Qualifier("errorLog")
    public Logger errorLogger() {
        return errorLog;
    }

    @Bean
    @Qualifier("eventSender")
    public EventSender eventSender() {
        return new EventSender(eventPublisher,properties);
    }

}