////////////////////////////////////////////////////////////////////////////////
/// @brief V8 utility functions
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2004-2012 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 triAGENS GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
/// @author Copyright 2011-2012, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#include "v8-execution.h"

#include <fstream>
#include <locale>

#include <v8.h>

#include "V8/v8-conv.h"

using namespace std;

// -----------------------------------------------------------------------------
// --SECTION--                                                 EXECUTION CONTEXT
// -----------------------------------------------------------------------------

// -----------------------------------------------------------------------------
// --SECTION--                                                      public types
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @addtogroup V8Utils
/// @{
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief execution context
////////////////////////////////////////////////////////////////////////////////

typedef struct js_exec_context_s {
  v8::Persistent<v8::Function> _func;
  v8::Persistent<v8::Object> _arguments;
}
js_exec_context_t;

////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////

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

////////////////////////////////////////////////////////////////////////////////
/// @addtogroup V8Utils
/// @{
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief creates a new execution context
////////////////////////////////////////////////////////////////////////////////

TRI_js_exec_context_t TRI_CreateExecutionContext (char const* script) {
  js_exec_context_t* ctx;

  // execute script inside the context
  v8::Handle<v8::Script> compiled = v8::Script::Compile(v8::String::New(script),
                                                        v8::String::New("--script--"));

  // compilation failed, print errors that happened during compilation
  if (compiled.IsEmpty()) {
    return 0;
  }

  // compute the function
  v8::Handle<v8::Value> val = compiled->Run();

  if (val.IsEmpty()) {
    return 0;
  }

  ctx = new js_exec_context_t;

  ctx->_func = v8::Persistent<v8::Function>::New(v8::Handle<v8::Function>::Cast(val));
  ctx->_arguments = v8::Persistent<v8::Object>::New(v8::Object::New());

  // return the handle
  return (TRI_js_exec_context_t) ctx;
}

////////////////////////////////////////////////////////////////////////////////
/// @brief frees an new execution context
////////////////////////////////////////////////////////////////////////////////

void TRI_FreeExecutionContext (TRI_js_exec_context_t context) {
  js_exec_context_t* ctx;

  ctx = (js_exec_context_t*) context;

  ctx->_func.Dispose();
  ctx->_func.Clear();

  ctx->_arguments.Dispose();
  ctx->_arguments.Clear();

  delete ctx;
}

////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////

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

////////////////////////////////////////////////////////////////////////////////
/// @addtogroup V8Utils
/// @{
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
/// @brief executes a result context
////////////////////////////////////////////////////////////////////////////////

TRI_json_t* TRI_ExecuteResultContext (TRI_js_exec_context_t context) {
  js_exec_context_t* ctx;

  ctx = (js_exec_context_t*) context;
  // convert back into a handle
  v8::Persistent<v8::Function> func = ctx->_func;

  // and execute the function
  v8::Handle<v8::Value> args[] = { ctx->_arguments };
  v8::Handle<v8::Value> result = func->Call(func, 1, args);

  if (result.IsEmpty()) {
    return NULL;
  }

  return TRI_ObjectToJson(result);
}

////////////////////////////////////////////////////////////////////////////////
/// @}
////////////////////////////////////////////////////////////////////////////////

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