////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 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 Jan Steemann
////////////////////////////////////////////////////////////////////////////////

#include "RocksDBV8Functions.h"
#include "Basics/Exceptions.h"
#include "Basics/Result.h"
#include "Cluster/ServerState.h"
#include "RocksDBEngine/RocksDBCommon.h"
#include "RocksDBEngine/RocksDBEngine.h"
#include "StorageEngine/EngineSelectorFeature.h"
#include "V8/v8-conv.h"
#include "V8/v8-globals.h"
#include "V8/v8-utils.h"

#include <v8.h>

using namespace arangodb;

/// this is just a stub
static void JS_FlushWal(v8::FunctionCallbackInfo<v8::Value> const& args) {
  TRI_V8_TRY_CATCH_BEGIN(isolate);
  v8::HandleScope scope(isolate);

  rocksdb::TransactionDB* db =
      static_cast<RocksDBEngine*>(EngineSelectorFeature::ENGINE)->db();

  rocksdb::Status status = db->GetBaseDB()->SyncWAL();

  if (!status.ok()) {
    Result res = rocksutils::convertStatus(status);
    TRI_V8_THROW_EXCEPTION(res.errorNumber());
  }

  TRI_V8_RETURN_TRUE();
  TRI_V8_TRY_CATCH_END
}

/// this is just a stub
static void JS_WaitCollectorWal(
    v8::FunctionCallbackInfo<v8::Value> const& args) {
  TRI_V8_TRY_CATCH_BEGIN(isolate);
  v8::HandleScope scope(isolate);

  if (ServerState::instance()->isCoordinator()) {
    TRI_V8_THROW_EXCEPTION(TRI_ERROR_NOT_IMPLEMENTED);
  }

  // this is just a stub
  TRI_V8_RETURN_TRUE();
  TRI_V8_TRY_CATCH_END
}

/// this is just a stub
static void JS_TransactionsWal(
    v8::FunctionCallbackInfo<v8::Value> const& args) {
  TRI_V8_TRY_CATCH_BEGIN(isolate);
  v8::HandleScope scope(isolate);

  if (ServerState::instance()->isCoordinator()) {
    TRI_V8_THROW_EXCEPTION(TRI_ERROR_NOT_IMPLEMENTED);
  }

  // this is just a stub
  TRI_V8_RETURN_TRUE();
  TRI_V8_TRY_CATCH_END
}

/// this is just a stub
static void JS_PropertiesWal(v8::FunctionCallbackInfo<v8::Value> const& args) {
  TRI_V8_TRY_CATCH_BEGIN(isolate);
  v8::HandleScope scope(isolate);

  if (ServerState::instance()->isCoordinator()) {
    TRI_V8_THROW_EXCEPTION(TRI_ERROR_NOT_IMPLEMENTED);
  }

  // this is just a stub
  TRI_V8_RETURN_TRUE();
  TRI_V8_TRY_CATCH_END
}

void RocksDBV8Functions::registerResources() {
  ISOLATE;
  v8::HandleScope scope(isolate);

  TRI_GET_GLOBALS();

  // patch ArangoCollection object
  v8::Handle<v8::ObjectTemplate> rt =
      v8::Handle<v8::ObjectTemplate>::New(isolate, v8g->VocbaseColTempl);
  TRI_ASSERT(!rt.IsEmpty());

  // add global WAL handling functions
  TRI_AddGlobalFunctionVocbase(isolate, TRI_V8_ASCII_STRING("WAL_FLUSH"),
                               JS_FlushWal, true);
  TRI_AddGlobalFunctionVocbase(isolate,
                               TRI_V8_ASCII_STRING("WAL_WAITCOLLECTOR"),
                               JS_WaitCollectorWal, true);
  TRI_AddGlobalFunctionVocbase(isolate, TRI_V8_ASCII_STRING("WAL_PROPERTIES"),
                               JS_PropertiesWal, true);
  TRI_AddGlobalFunctionVocbase(isolate, TRI_V8_ASCII_STRING("WAL_TRANSACTIONS"),
                               JS_TransactionsWal, true);
}