////////////////////////////////////////////////////////////////////////////////
/// @brief abstract actions
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2014 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, ArangoDB GmbH, Cologne, Germany
/// @author Copyright 2012-2014, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#include "actions.h"

#include "Basics/ReadLocker.h"
#include "Basics/ReadWriteLock.h"
#include "Basics/StringUtils.h"
#include "Basics/WriteLocker.h"
#include "Basics/delete_object.h"
#include "Basics/logging.h"
#include "Rest/HttpRequest.h"

using namespace std;
using namespace triagens::basics;

// -----------------------------------------------------------------------------
// --SECTION--                                                 private variables
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief actions
////////////////////////////////////////////////////////////////////////////////

static map<string, TRI_action_t*> Actions;

////////////////////////////////////////////////////////////////////////////////
/// @brief prefix actions
////////////////////////////////////////////////////////////////////////////////

static map<string, TRI_action_t*> PrefixActions;

////////////////////////////////////////////////////////////////////////////////
/// @brief actions lock
////////////////////////////////////////////////////////////////////////////////

static ReadWriteLock ActionsLock;

// -----------------------------------------------------------------------------
// --SECTION--                                                  public functions
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief defines an action
////////////////////////////////////////////////////////////////////////////////

TRI_action_t* TRI_DefineActionVocBase (string const& name,
                                       TRI_action_t* action) {
  WRITE_LOCKER(ActionsLock);

  string url = name;

  while (! url.empty() && url[0] == '/') {
    url = url.substr(1);
  }

  action->_url = url;
  action->_urlParts = StringUtils::split(url, "/").size();

  // create a new action and store the callback function
  if (action->_isPrefix) {
    if (PrefixActions.find(url) == PrefixActions.end()) {
      PrefixActions[url] = action;
    }
    else {
      TRI_action_t* oldAction = PrefixActions[url];

      if (oldAction->_type != action->_type) {
        LOG_ERROR("trying to define two incompatible actions of type '%s' and '%s' for prefix url '%s'",
                  oldAction->_type.c_str(),
                  action->_type.c_str(),
                  action->_url.c_str());

        delete oldAction;
      }
      else {
        delete action;
        action = oldAction;
      }
    }
  }
  else {
    if (Actions.find(url) == Actions.end()) {
      Actions[url] = action;
    }
    else {
      TRI_action_t* oldAction = Actions[url];

      if (oldAction->_type != action->_type) {
        LOG_ERROR("trying to define two incompatible actions of type '%s' and type '%s' for url '%s'",
                  oldAction->_type.c_str(),
                  action->_type.c_str(),
                  action->_url.c_str());

        delete oldAction;
      }
      else {
        delete action;
        action = oldAction;
      }
    }
  }

  // some debug output
  LOG_DEBUG("created %s %saction '%s'",
            action->_type.c_str(),
            (action->_isPrefix ? "prefix " : ""),
            url.c_str());

  // return old or new action description
  return action;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief looks up an action
////////////////////////////////////////////////////////////////////////////////

TRI_action_t* TRI_LookupActionVocBase (triagens::rest::HttpRequest* request) {
  // check if we know a callback
  vector<string> suffix = request->suffix();

  // find a direct match
  string name = StringUtils::join(suffix, '/');
  

  READ_LOCKER(ActionsLock);
  map<string, TRI_action_t*>::iterator i = Actions.find(name);

  if (i != Actions.end()) {
    return i->second;
  }

  // find longest prefix match
  while (true) {
    name = StringUtils::join(suffix, '/');
    i = PrefixActions.find(name);

    if (i != PrefixActions.end()) {
      return i->second;
    }

    if (suffix.empty()) {
      break;
    }

    suffix.pop_back();
  }

  return nullptr;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief deletes all defined actions
////////////////////////////////////////////////////////////////////////////////

void TRI_CleanupActions () {
  for_each(Actions.begin(), Actions.end(), DeleteObjectValue());
  Actions.clear();

  for_each(PrefixActions.begin(), PrefixActions.end(), DeleteObjectValue());
  PrefixActions.clear();
}

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

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