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/*
 * Copyright 2017 Google, 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.netflix.spinnaker.echo.config;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.netflix.spinnaker.echo.artifacts.MessageArtifactTranslator;
import com.netflix.spinnaker.echo.config.GooglePubsubProperties.GooglePubsubSubscription;
import com.netflix.spinnaker.echo.pubsub.PubsubEventCreator;
import com.netflix.spinnaker.echo.pubsub.PubsubMessageHandler;
import com.netflix.spinnaker.echo.pubsub.PubsubPublishers;
import com.netflix.spinnaker.echo.pubsub.PubsubSubscribers;
import com.netflix.spinnaker.echo.pubsub.google.GooglePubsubPublisher;
import com.netflix.spinnaker.echo.pubsub.google.GooglePubsubSubscriber;
import com.netflix.spinnaker.echo.pubsub.model.EventCreator;
import com.netflix.spinnaker.echo.pubsub.model.PubsubPublisher;
import com.netflix.spinnaker.echo.pubsub.model.PubsubSubscriber;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import javax.annotation.PostConstruct;
import javax.validation.Valid;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Configuration;

@Configuration
@Slf4j
@ConditionalOnExpression("${pubsub.enabled:false} && ${pubsub.google.enabled:false}")
@EnableConfigurationProperties(GooglePubsubProperties.class)
@RequiredArgsConstructor
public class GooglePubsubConfig {
  private final PubsubSubscribers pubsubSubscribers;
  private final PubsubPublishers pubsubPublishers;
  private final PubsubMessageHandler.Factory pubsubMessageHandlerFactory;
  @Valid private final GooglePubsubProperties googlePubsubProperties;
  private final ObjectMapper mapper;
  private final MessageArtifactTranslator.Factory messageArtifactTranslatorFactory;

  @PostConstruct
  void googlePubsubSubscribers() {
    log.info("Creating Google Pubsub Subscribers");
    List newSubscribers = new ArrayList<>();
    googlePubsubProperties
        .getSubscriptions()
        .forEach(
            (GooglePubsubSubscription subscription) -> {
              log.info(
                  "Bootstrapping Google Pubsub Subscriber listening to subscription: {} in project: {}",
                  subscription.getSubscriptionName(),
                  subscription.getProject());

              Optional messageArtifactTranslator =
                  Optional.ofNullable(subscription.readTemplatePath())
                      .map(messageArtifactTranslatorFactory::createJinja);
              EventCreator eventCreator = new PubsubEventCreator(messageArtifactTranslator);
              PubsubMessageHandler pubsubMessageHandler =
                  pubsubMessageHandlerFactory.create(eventCreator);

              GooglePubsubSubscriber subscriber =
                  GooglePubsubSubscriber.buildSubscriber(subscription, pubsubMessageHandler);

              newSubscribers.add(subscriber);
            });
    pubsubSubscribers.putAll(newSubscribers);
  }

  @PostConstruct
  void googlePubsubPublishers() throws IOException {
    log.info("Creating Google Pubsub Publishers");
    List newPublishers =
        googlePubsubProperties.getPublishers().stream()
            .map(
                publisherConfig -> {
                  log.info(
                      "Bootstrapping Google Pubsub Publisher named {} on topic {} in project {} publishing content {}",
                      publisherConfig.getName(),
                      publisherConfig.getTopicName(),
                      publisherConfig.getProject(),
                      publisherConfig.getContent());
                  return GooglePubsubPublisher.buildPublisher(publisherConfig, mapper);
                })
            .collect(Collectors.toList());

    pubsubPublishers.putAll(newPublishers);
  }
}