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/*
 * Copyright (C) 2009-2015 Typesafe Inc. 
 */
package play.api.inject

import java.util.concurrent.Executor

import akka.actor.ActorSystem
import javax.inject.Provider

import akka.stream.Materializer
import play.api._
import play.api.libs.concurrent.{ActorSystemProvider, ExecutionContextProvider, MaterializerProvider}

import scala.concurrent.{ExecutionContext, ExecutionContextExecutor}

/**
 * @see compare-to-play.md
 *
 * The Play BuiltinModule.
 *
 * Provides all the core components of a Play application. This is typically automatically enabled by Play for an
 * application.
 */
class BuiltinModule extends Module {
  def bindings(env: Environment, configuration: Configuration): Seq[Binding[_]] = {
    Seq(
      bind[Environment] to env,
      bind[ConfigurationProvider].to(new ConfigurationProvider(configuration)),
      bind[Configuration].toProvider[ConfigurationProvider],

      // Application lifecycle, bound both to the interface, and its implementation, so that Application can access it
      // to shut it down.
      bind[DefaultApplicationLifecycle].toSelf,
      bind[ApplicationLifecycle].to(bind[DefaultApplicationLifecycle]),

      bind[Application].to[DefaultApplication],

      bind[ActorSystem].toProvider[ActorSystemProvider],
      bind[Materializer].toProvider[MaterializerProvider],
      bind[ExecutionContextExecutor].toProvider[ExecutionContextProvider],
      bind[ExecutionContext].to[ExecutionContextExecutor],
      bind[Executor].to[ExecutionContextExecutor]
    )
  }
}

// This allows us to access the original configuration via this
// provider while overriding the binding for Configuration itself.
class ConfigurationProvider(val get: Configuration) extends Provider[Configuration]