[NTP::PhysicalWeb] Wire Physical Web provider to the data source.

components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.h

 // 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_SNIPPETS_PHYSICAL_WEB_PAGES_PHYSICAL_WEB_PAGE_SUGGESTIONS_PROVIDER_H_
 #define COMPONENTS_NTP_SNIPPETS_PHYSICAL_WEB_PAGES_PHYSICAL_WEB_PAGE_SUGGESTIONS_PROVIDER_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
+#include "base/values.h"
 #include "components/ntp_snippets/category.h"
 #include "components/ntp_snippets/category_factory.h"
 #include "components/ntp_snippets/category_status.h"
 #include "components/ntp_snippets/content_suggestion.h"
 #include "components/ntp_snippets/content_suggestions_provider.h"
+#include "components/physical_web/data_source/physical_web_data_source.h"
+#include "components/physical_web/data_source/physical_web_listener.h"
 
 namespace ntp_snippets {
 
-// TODO(vitaliii): remove when Physical Web C++ interface is provided.
-struct UrlInfo {
-  UrlInfo();
-  UrlInfo(const UrlInfo& other);
-  ~UrlInfo();
-  base::Time scan_time;
-  GURL site_url;
-  std::string title;
-  std::string description;
-};
-
 // Provides content suggestions from the Physical Web Service.
-class PhysicalWebPageSuggestionsProvider : public ContentSuggestionsProvider {
+class PhysicalWebPageSuggestionsProvider : public ContentSuggestionsProvider,
+                                           public PhysicalWebListener {
  public:
   PhysicalWebPageSuggestionsProvider(
       ContentSuggestionsProvider::Observer* observer,
-      CategoryFactory* category_factory);
+      CategoryFactory* category_factory,
+      PhysicalWebDataSource* physical_web_data_source);
   ~PhysicalWebPageSuggestionsProvider() override;
 
-  void OnDisplayableUrlsChanged(const std::vector<UrlInfo>& urls);
-
   // ContentSuggestionsProvider implementation.
   CategoryStatus GetCategoryStatus(Category category) override;
   CategoryInfo GetCategoryInfo(Category category) override;
   void DismissSuggestion(const ContentSuggestion::ID& suggestion_id) override;
   void FetchSuggestionImage(const ContentSuggestion::ID& suggestion_id,
                             const ImageFetchedCallback& callback) override;
   void Fetch(const Category& category,
              const std::set<std::string>& known_suggestion_ids,
              const FetchDoneCallback& callback) override;
   void ClearHistory(
       base::Time begin,
       base::Time end,
       const base::Callback<bool(const GURL& url)>& filter) override;
   void ClearCachedSuggestions(Category category) override;
   void GetDismissedSuggestionsForDebugging(
       Category category,
       const DismissedSuggestionsCallback& callback) override;
   void ClearDismissedSuggestionsForDebugging(Category category) override;
 
  private:
+  friend class PhysicalWebPageSuggestionsProviderTest;
+
+  // Updates the |category_status_| and notifies the |observer_|, if necessary.
   void NotifyStatusChanged(CategoryStatus new_status);
 
+  // Manually requests all physical web pages and updates the suggestions.
+  void FetchPhysicalWebPages();
+
+  // Converts an Physical Web page to a ContentSuggestion.
+  ContentSuggestion ConvertPhysicalWebPage(
+      const base::DictionaryValue& page) const;
+
+  // PhysicalWebListener implementation.
+  void OnFound(const std::string& url) override;
+  void OnLost(const std::string& url) override;
+  void OnDistanceChanged(const std::string& url,
+                         double distance_estimate) override;
+
   CategoryStatus category_status_;
   const Category provided_category_;
+  PhysicalWebDataSource* physical_web_data_source_;
 
   DISALLOW_COPY_AND_ASSIGN(PhysicalWebPageSuggestionsProvider);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_PHYSICAL_WEB_PAGES_PHYSICAL_WEB_PAGE_SUGGESTIONS_PROVIDER_H_