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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.reporter.file;

import io.gravitee.common.service.AbstractService;
import io.gravitee.reporter.api.Reportable;
import io.gravitee.reporter.api.Reporter;
import io.gravitee.reporter.file.config.FileReporterConfiguration;
import io.gravitee.reporter.file.formatter.Formatter;
import io.gravitee.reporter.file.formatter.FormatterFactory;
import io.gravitee.reporter.file.vertx.VertxFileWriter;
import io.vertx.core.CompositeFuture;
import io.vertx.core.Vertx;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;

/**
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author GraviteeSource Team
 */
public class FileReporter extends AbstractService implements Reporter {

  private final Logger logger = LoggerFactory.getLogger(FileReporter.class);

  @Autowired
  private Vertx vertx;

  @Autowired
  private FileReporterConfiguration configuration;

  @Value("${reporters.file.enabled:false}")
  private boolean enabled;

  private Map, VertxFileWriter> writers = new HashMap<>(
    4
  );

  @Override
  public void report(Reportable reportable) {
    writers.get(reportable.getClass()).write(reportable);
  }

  @Override
  public boolean canHandle(Reportable reportable) {
    return enabled;
  }

  @Override
  protected void doStart() throws Exception {
    if (enabled) {
      // Initialize writers
      for (MetricsType type : MetricsType.values()) {
        Formatter formatter = FormatterFactory.getFormatter(
          configuration.getOutputType()
        );
        applicationContext
          .getAutowireCapableBeanFactory()
          .autowireBean(formatter);

        writers.put(
          type.getClazz(),
          new VertxFileWriter<>(
            vertx,
            type,
            formatter,
            configuration.getFilename() +
            '.' +
            configuration.getOutputType().getExtension()
          )
        );
      }

      CompositeFuture
        .join(
          writers
            .values()
            .stream()
            .map(VertxFileWriter::initialize)
            .collect(Collectors.toList())
        )
        .setHandler(
          event -> {
            if (event.succeeded()) {
              logger.info("File reporter successfully started");
            } else {
              logger.info(
                "An error occurs while starting file reporter",
                event.cause()
              );
            }
          }
        );
    }
  }

  @Override
  protected void doStop() throws Exception {
    if (enabled) {
      CompositeFuture
        .join(
          writers
            .values()
            .stream()
            .map(VertxFileWriter::close)
            .collect(Collectors.toList())
        )
        .setHandler(
          event -> {
            if (event.succeeded()) {
              logger.info("File reporter successfully stopped");
            } else {
              logger.info(
                "An error occurs while stopping file reporter",
                event.cause()
              );
            }
          }
        );
    }
  }
}