/*
 * Copyright (C) Lightbend Inc. <https://www.lightbend.com>
 */

package play;

import javax.inject.Inject;
import javax.inject.Singleton;

import com.typesafe.config.Config;
import play.inject.Injector;

/**
 * Default implementation of a Play Application.
 *
 * <p>Application creation is handled by the framework engine.
 */
@Singleton
public class DefaultApplication implements Application {

  private final play.api.Application application;
  private final Config config;
  private final Environment environment;
  private final Injector injector;

  /**
   * Create an application that wraps a Scala application.
   *
   * @param application the application to wrap
   * @param config the new application's configuration
   * @param injector the new application's injector
   */
  @Inject
  public DefaultApplication(
      play.api.Application application, Config config, Injector injector, Environment environment) {
    this.application = application;
    this.config = config;
    this.injector = injector;
    this.environment = environment;
  }

  /**
   * Create an application that wraps a Scala application.
   *
   * @param application the application to wrap
   * @param config the new application's configuration
   * @param injector the new application's injector
   * @deprecated Use {@link #DefaultApplication(play.api.Application, Config, Injector,
   *     Environment)} instead.
   */
  @Deprecated
  public DefaultApplication(play.api.Application application, Config config, Injector injector) {
    this(application, config, injector, new Environment(application.environment()));
  }

  /**
   * Create an application that wraps a Scala application.
   *
   * @param application the application to wrap
   * @param injector the new application's injector
   */
  public DefaultApplication(play.api.Application application, Injector injector) {
    this(application, application.configuration().underlying(), injector);
  }

  /**
   * Get the underlying Scala application.
   *
   * @return the underlying application
   */
  @Override
  @Deprecated
  public play.api.Application getWrappedApplication() {
    return application;
  }

  /**
   * Get the application as a Scala application.
   *
   * @see play.api.Application
   */
  @Override
  public play.api.Application asScala() {
    return application;
  }

  /**
   * Get the application environment.
   *
   * @return the environment.
   */
  public Environment environment() {
    return environment;
  }

  /**
   * Get the application configuration.
   *
   * @return the configuration
   */
  @Override
  public Config config() {
    return config;
  }

  /**
   * Get the injector for this application.
   *
   * @return the injector
   */
  @Override
  public Injector injector() {
    return injector;
  }
}
