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/**
 * Copyright (C) 2012 Twitter 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.twitter.finatra

import com.twitter.finagle.Service
import com.twitter.util.{Await, Future}
import com.twitter.finagle.http.{Request => FinagleRequest, Response => FinagleResponse}

class AppService(controllers: ControllerCollection)
  extends Service[FinagleRequest, FinagleResponse] {

  def render: ResponseBuilder = new ResponseBuilder

  def apply(rawRequest: FinagleRequest): Future[FinagleResponse] = {
    val adaptedRequest  = RequestAdapter(rawRequest)

    try {
      attemptRequest(rawRequest).handle {
        case t: Throwable =>
          Await.result(
            ErrorHandler(adaptedRequest, t, controllers)
          )
      }
    } catch {
      case e: Exception =>
        ErrorHandler(adaptedRequest, e, controllers)
    }
  }

  def attemptRequest(rawRequest: FinagleRequest): Future[FinagleResponse] = {
    val adaptedRequest = RequestAdapter(rawRequest)

    controllers.dispatch(rawRequest) match {
      case Some(response) =>
        response.asInstanceOf[Future[FinagleResponse]]
      case None =>
        ResponseAdapter(adaptedRequest, controllers.notFoundHandler(adaptedRequest))
    }
  }

}