/*
 * Copyright 2016 Google Inc. All Rights Reserved.
 *
 * 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.
 */
#ifndef COBALT_SCRIPT_MOZJS_45_MOZJS_ENGINE_H_
#define COBALT_SCRIPT_MOZJS_45_MOZJS_ENGINE_H_

#include <vector>

#include "base/threading/thread_checker.h"
#include "base/timer.h"
#include "cobalt/script/javascript_engine.h"
#include "third_party/mozjs-45/js/src/jsapi.h"

namespace cobalt {
namespace script {
namespace mozjs {

class MozjsEngine : public JavaScriptEngine {
 public:
  MozjsEngine();
  ~MozjsEngine() OVERRIDE;

  scoped_refptr<GlobalEnvironment> CreateGlobalEnvironment() OVERRIDE;
  void CollectGarbage() OVERRIDE;
  void ReportExtraMemoryCost(size_t bytes) OVERRIDE;
  size_t UpdateMemoryStatsAndReturnReserved() OVERRIDE;

 private:
  void TimerGarbageCollect();
  static bool ContextCallback(JSContext* context, unsigned context_op,
                              void* data);
  static void GCCallback(JSRuntime* runtime, JSGCStatus status, void* data);
  static void FinalizeCallback(JSFreeOp* free_op, JSFinalizeStatus status,
                               bool is_compartment, void* data);

  base::ThreadChecker thread_checker_;

  // Top-level object that represents the Javascript engine. Typically there is
  // one per process, but it's allowed to have multiple.
  JSRuntime* runtime_;

  // A list of all contexts created for this JSRuntime.
  typedef std::vector<JSContext*> ContextVector;
  ContextVector contexts_;

  // The amount of externally allocated memory since last forced GC.
  size_t accumulated_extra_memory_cost_;

  // Used to trigger a garbage collection periodically.
  base::RepeatingTimer<MozjsEngine> gc_timer_;
};
}  // namespace mozjs
}  // namespace script
}  // namespace cobalt

#endif  // COBALT_SCRIPT_MOZJS_45_MOZJS_ENGINE_H_