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// Copyright 2018 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_CONTEXTUAL_CONTEXTUAL_CONTENT_SUGGESTIONS_SERVICE_PROXY_H_
#define COMPONENTS_NTP_SNIPPETS_CONTEXTUAL_CONTEXTUAL_CONTENT_SUGGESTIONS_SERVICE_PROXY_H_
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "components/ntp_snippets/contextual/cluster.h"
#include "components/ntp_snippets/contextual/contextual_content_suggestions_service.h"
class GURL;
namespace contextual_suggestions {
// Class providing access to the Contextual Content Suggestions Service and
// caching the list of current suggestions shown in a tab. It is owned by a UI
// object. There could be multiple instances of serivce proxy. Either can be
// torn down with a part of UI that owns it, which doesn't affect other proxies.
class ContextualContentSuggestionsServiceProxy {
public:
using ClustersCallback = ntp_snippets::FetchClustersCallback;
using Cluster = ntp_snippets::Cluster;
ContextualContentSuggestionsServiceProxy(
ntp_snippets::ContextualContentSuggestionsService* service,
std::unique_ptr<ContextualSuggestionsMetricsReporter> metrics_reporter);
~ContextualContentSuggestionsServiceProxy();
// Fetches contextual suggestions for a given |url|.
void FetchContextualSuggestions(const GURL& url, ClustersCallback callback);
// Fetches an image for a contextual suggestion with specified
// |suggestion_id|.
void FetchContextualSuggestionImage(
const std::string& suggestion_id,
ntp_snippets::ImageFetchedCallback callback);
// Fetches a favicon for a contextual suggestion with specified
// |suggestion_id|.
void FetchContextualSuggestionFavicon(
const std::string& suggestion_id,
ntp_snippets::ImageFetchedCallback callback);
// Clears the state of the proxy.
void ClearState();
// Reports user interface event to the service.
void ReportEvent(ukm::SourceId, ContextualSuggestionsEvent event);
// Ensures that all metrics are properly flushed.
void FlushMetrics();
private:
void FetchImageImpl(const GURL& image_url,
const std::string& image_id,
ntp_snippets::ImageFetchedCallback callback);
void CacheSuggestions(ClustersCallback callback,
std::string peek_text,
std::vector<Cluster> clusters);
// Pointer to the service.
ntp_snippets::ContextualContentSuggestionsService* service_;
// Cache of contextual suggestions.
std::map<std::string, ntp_snippets::ContextualSuggestion> suggestions_;
// Sink for reporting metrics for this proxy.
std::unique_ptr<contextual_suggestions::ContextualSuggestionsMetricsReporter>
metrics_reporter_;
// The most recent SourceId in use by metrics_reporter_, or
// ukm::kInvalidSourceId.
ukm::SourceId last_ukm_source_id_;
// Weak pointer factory to cancel pending callbacks.
base::WeakPtrFactory<ContextualContentSuggestionsServiceProxy>
weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ContextualContentSuggestionsServiceProxy);
};
} // namespace contextual_suggestions
#endif // COMPONENTS_NTP_SNIPPETS_CONTEXTUAL_CONTEXTUAL_CONTENT_SUGGESTIONS_SERVICE_PROXY_H_
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