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// Copyright 2016 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.
#ifndef COMPONENTS_NTP_TILES_WEBUI_POPULAR_SITES_HANDLER_H_
#define COMPONENTS_NTP_TILES_WEBUI_POPULAR_SITES_HANDLER_H_
#include <memory>
#include <string>
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
namespace base {
class ListValue;
} // namespace base
namespace ntp_tiles {
class PopularSites;
class PopularSitesInternalsMessageHandlerClient;
// Implements the WebUI message handler for chrome://popular-sites-internals/
//
// Because content and iOS use different implementations of WebUI, this class
// implements the generic portion and depends on the embedder to inject a bridge
// to the embedder's API. It cannot itself implement either API directly.
class PopularSitesInternalsMessageHandler {
public:
explicit PopularSitesInternalsMessageHandler(
PopularSitesInternalsMessageHandlerClient* web_ui);
~PopularSitesInternalsMessageHandler();
// Called when the WebUI page's JavaScript has loaded and it is ready to
// receive RegisterMessageCallback() calls.
void RegisterMessages();
private:
// Callbacks registered in RegisterMessages().
void HandleRegisterForEvents(const base::ListValue* args);
void HandleUpdate(const base::ListValue* args);
void HandleViewJson(const base::ListValue* args);
void SendOverrides();
void SendDownloadResult(bool success);
void SendSites();
void SendJson(const std::string& json);
// Completion handler for popular_sites_->StartFetch().
void OnPopularSitesAvailable(bool explicit_request, bool success);
// Bridge to embedder's API.
PopularSitesInternalsMessageHandlerClient* web_ui_;
std::unique_ptr<PopularSites> popular_sites_;
base::WeakPtrFactory<PopularSitesInternalsMessageHandler> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(PopularSitesInternalsMessageHandler);
};
} // namespace ntp_tiles
#endif // COMPONENTS_NTP_TILES_WEBUI_POPULAR_SITES_HANDLER_H_
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