// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "extensions/renderer/lazy_background_page_native_handler.h"

#include "base/bind.h"
#include "content/public/renderer/render_view.h"
#include "extensions/common/extension_messages.h"
#include "extensions/common/manifest_handlers/background_info.h"
#include "extensions/renderer/extension_helper.h"
#include "extensions/renderer/script_context.h"

namespace extensions {

LazyBackgroundPageNativeHandler::LazyBackgroundPageNativeHandler(
    ScriptContext* context)
    : ObjectBackedNativeHandler(context) {
  RouteFunction(
      "IncrementKeepaliveCount",
      base::Bind(&LazyBackgroundPageNativeHandler::IncrementKeepaliveCount,
                 base::Unretained(this)));
  RouteFunction(
      "DecrementKeepaliveCount",
      base::Bind(&LazyBackgroundPageNativeHandler::DecrementKeepaliveCount,
                 base::Unretained(this)));
}

void LazyBackgroundPageNativeHandler::IncrementKeepaliveCount(
    const v8::FunctionCallbackInfo<v8::Value>& args) {
  if (!context())
    return;
  content::RenderView* render_view = context()->GetRenderView();
  if (IsContextLazyBackgroundPage(render_view, context()->extension())) {
    render_view->Send(new ExtensionHostMsg_IncrementLazyKeepaliveCount(
        render_view->GetRoutingID()));
  }
}

void LazyBackgroundPageNativeHandler::DecrementKeepaliveCount(
    const v8::FunctionCallbackInfo<v8::Value>& args) {
  if (!context())
    return;
  content::RenderView* render_view = context()->GetRenderView();
  if (IsContextLazyBackgroundPage(render_view, context()->extension())) {
    render_view->Send(new ExtensionHostMsg_DecrementLazyKeepaliveCount(
        render_view->GetRoutingID()));
  }
}

bool LazyBackgroundPageNativeHandler::IsContextLazyBackgroundPage(
    content::RenderView* render_view,
    const Extension* extension) {
  if (!render_view)
    return false;

  ExtensionHelper* helper = ExtensionHelper::Get(render_view);
  return (extension && BackgroundInfo::HasLazyBackgroundPage(extension) &&
          helper->view_type() == VIEW_TYPE_EXTENSION_BACKGROUND_PAGE);
}

}  // namespace extensions