////////////////////////////////////////////////////////////////////////////////
/// @brief abstract class for http handlers
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2014-2015 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// 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.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
/// @author Copyright 2014-2015, ArangoDB GmbH, Cologne, Germany
/// @author Copyright 2009-2014, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#include "HttpHandler.h"

#include "Basics/StringUtils.h"
#include "Basics/logging.h"
#include "Dispatcher/Dispatcher.h"
#include "HttpServer/HttpServerJob.h"
#include "Rest/HttpRequest.h"

using namespace triagens::basics;
using namespace triagens::rest;

// -----------------------------------------------------------------------------
// --SECTION--                                                 class HttpHandler
// -----------------------------------------------------------------------------

// -----------------------------------------------------------------------------
// --SECTION--                                      constructors and destructors
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief constructs a new handler
////////////////////////////////////////////////////////////////////////////////

HttpHandler::HttpHandler (HttpRequest* request)
  : _dispatcherThread(nullptr),
    _request(request),
    _response(nullptr),
    _server(nullptr) {
}

////////////////////////////////////////////////////////////////////////////////
/// @brief destructs a handler
////////////////////////////////////////////////////////////////////////////////

HttpHandler::~HttpHandler () {
  delete _request;
  delete _response;
}

// -----------------------------------------------------------------------------
// --SECTION--                                            virtual public methods
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief returns the queue name
////////////////////////////////////////////////////////////////////////////////

size_t HttpHandler::queue () const {
  bool found;
  const char* queue = _request->header("x-arango-queue", found);

  if (found) {
    uint32_t n = StringUtils::uint32(queue);

    if (n == 0) {
      return Dispatcher::STANDARD_QUEUE;
    }

    return n + (Dispatcher::SYSTEM_QUEUE_SIZE - 1);
  }

  return Dispatcher::STANDARD_QUEUE;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief sets the thread which currently dealing with the job
////////////////////////////////////////////////////////////////////////////////

void HttpHandler::setDispatcherThread (DispatcherThread* dispatcherThread) {
  _dispatcherThread = dispatcherThread;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief prepares for execution
////////////////////////////////////////////////////////////////////////////////

void HttpHandler::prepareExecute () {
}

////////////////////////////////////////////////////////////////////////////////
/// @brief tries to cancel an execution
////////////////////////////////////////////////////////////////////////////////

void HttpHandler::finalizeExecute () {
}

////////////////////////////////////////////////////////////////////////////////
/// @brief tries to cancel an execution
////////////////////////////////////////////////////////////////////////////////

bool HttpHandler::cancel () {
  return false;
}


////////////////////////////////////////////////////////////////////////////////
/// @brief adds a response
////////////////////////////////////////////////////////////////////////////////

void HttpHandler::addResponse (HttpHandler*) {
  // nothing by default
}

// -----------------------------------------------------------------------------
// --SECTION--                                                    public methods
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief register the server object
////////////////////////////////////////////////////////////////////////////////

void HttpHandler::setServer (HttpHandlerFactory* server) {
  _server = server;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief return a pointer to the request
////////////////////////////////////////////////////////////////////////////////

HttpRequest const* HttpHandler::getRequest () const {
  return _request;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief steal the request
////////////////////////////////////////////////////////////////////////////////

HttpRequest* HttpHandler::stealRequest () {
  HttpRequest* tmp = _request;
  _request = nullptr;
  return tmp;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief returns the response
////////////////////////////////////////////////////////////////////////////////

HttpResponse* HttpHandler::getResponse () const {
  return _response;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief steal the response
////////////////////////////////////////////////////////////////////////////////

HttpResponse* HttpHandler::stealResponse () {
  HttpResponse* tmp = _response;
  _response = nullptr;
  return tmp;
}

// -----------------------------------------------------------------------------
// --SECTION--                                                 protected methods
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief ensure the handler has only one response, otherwise we'd have a leak
////////////////////////////////////////////////////////////////////////////////

void HttpHandler::removePreviousResponse () {
  if (_response != nullptr) {
    delete _response;
    _response = nullptr;
  }
}

////////////////////////////////////////////////////////////////////////////////
/// @brief create a new HTTP response
////////////////////////////////////////////////////////////////////////////////

HttpResponse* HttpHandler::createResponse (HttpResponse::HttpResponseCode code) {
  // avoid having multiple responses. this would be a memleak
  removePreviousResponse();

  int32_t apiCompatibility;

  if (this->_request != nullptr) {
    apiCompatibility = this->_request->compatibility();
  }
  else {
    apiCompatibility = HttpRequest::MinCompatibility;
  }

  // otherwise, we return a "standard" (standalone) Http response
  return new HttpResponse(code, apiCompatibility);
}

// -----------------------------------------------------------------------------
// --SECTION--                                                       END-OF-FILE
// -----------------------------------------------------------------------------

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