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/*
 * -\-\-
 * Spotify Apollo Jetty HTTP Server Module
 * --
 * Copyright (C) 2013 - 2015 Spotify AB
 * --
 * 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.spotify.apollo.http.server;

import com.google.common.io.Closer;
import com.google.inject.Inject;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

import javax.inject.Named;
import javax.inject.Provider;

import static java.util.Objects.requireNonNull;

class HttpServerProvider implements Provider {

  private static final Logger LOG = LoggerFactory.getLogger(HttpServerProvider.class);

  private final Closer closer;
  private final HttpServerConfig config;
  private final Runnable onClose;
  // non-final because optional injection doesn't work with constructor args
  // NOTE: it is probably a good idea to make this handle both statistics tracking and logging
  private RequestOutcomeConsumer logger = CombinedFormatLogger.logger();

  @Inject
  HttpServerProvider(
      Closer closer,
      HttpServerConfig config,
      @Named("http-server-on-close") Runnable onClose) {
    this.closer = closer;
    this.config = config;
    this.onClose = onClose;
  }

  @Override
  public HttpServer get() {
    if (!enabled(config)) {
      return NoopServer.INSTANCE;
    } else {
      return new HttpServerImpl(closer, config, onClose, logger);
    }
  }

  /**
   * Optionally override how logging is done. See
   * https://github.com/google/guice/wiki/Injections#optional-injections for detailed information
   * about how to override. You will probably want a Guice module with a method similar to:
   *    * {@code
   *   protected void configure() {
   *     bind(RequestOutcomeConsumer.class).toInstance(new MyLogger());
   *   }
   * }
   * 
   *
   * @param logger the consumer to use instead of the default
   */
  @Inject(optional = true)
  public void setLogger(RequestOutcomeConsumer logger) {
    this.logger = requireNonNull(logger);
  }

  static boolean enabled(HttpServerConfig config) {
    return config.port() != null;
  }

  private enum NoopServer implements HttpServer {
    INSTANCE;

    @Override
    public void start(com.spotify.apollo.request.RequestHandler requestHandler) {
      LOG.warn("Not loading http server - enable with: http.server.port = 8080");
    }

    @Override
    public void close() throws IOException {
      // Do nothing
    }
  }
}