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// Copyright 2017 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_REPORTING_CONTEXTUAL_CONTENT_SUGGESTIONS_SERVICE_H_
#define COMPONENTS_NTP_SNIPPETS_CONTEXTUAL_REPORTING_CONTEXTUAL_CONTENT_SUGGESTIONS_SERVICE_H_
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/optional.h"
#include "components/image_fetcher/core/image_fetcher.h"
#include "components/keyed_service/core/keyed_service.h"
#include "components/ntp_snippets/callbacks.h"
#include "components/ntp_snippets/content_suggestion.h"
#include "components/ntp_snippets/contextual/contextual_suggestions_cache.h"
#include "components/ntp_snippets/contextual/contextual_suggestions_fetcher.h"
#include "components/ntp_snippets/contextual/reporting/contextual_suggestions_debugging_reporter.h"
#include "components/ntp_snippets/contextual/reporting/contextual_suggestions_reporter.h"
#include "services/metrics/public/cpp/ukm_source_id.h"
namespace ntp_snippets {
class CachedImageFetcher;
class RemoteSuggestionsDatabase;
} // namespace ntp_snippets
namespace contextual_suggestions {
static constexpr int kFetchCacheCapacity = 10;
class ContextualContentSuggestionsServiceProxy;
// Retrieves contextual suggestions for a given URL and fetches images
// for contextual suggestion, using caching.
class ContextualContentSuggestionsService : public KeyedService {
public:
ContextualContentSuggestionsService(
std::unique_ptr<ContextualSuggestionsFetcher>
contextual_suggestions_fetcher,
std::unique_ptr<ntp_snippets::CachedImageFetcher> image_fetcher,
std::unique_ptr<ntp_snippets::RemoteSuggestionsDatabase>
contextual_suggestions_database,
std::unique_ptr<
contextual_suggestions::ContextualSuggestionsReporterProvider>
reporter_provider);
~ContextualContentSuggestionsService() override;
// Asynchronously fetches contextual suggestions for the given URL.
virtual void FetchContextualSuggestionClusters(
const GURL& url,
FetchClustersCallback callback,
ReportFetchMetricsCallback metrics_callback);
// Fetches an image pointed to by |url| and internally caches it using
// |suggestion_id|. Asynchronous if cache or network is queried.
virtual void FetchContextualSuggestionImage(
const ntp_snippets::ContentSuggestion::ID& suggestion_id,
const GURL& url,
ntp_snippets::ImageFetchedCallback callback);
void FetchDone(const GURL& url,
FetchClustersCallback callback,
ReportFetchMetricsCallback metrics_callback,
ContextualSuggestionsResult result);
// Used to surface metrics events via chrome://eoc-internals.
ContextualSuggestionsDebuggingReporter* GetDebuggingReporter();
// Expose cached results for debugging.
base::flat_map<GURL, ContextualSuggestionsResult>
GetAllCachedResultsForDebugging();
// Clear the cached results for debugging.
void ClearCachedResultsForDebugging();
std::unique_ptr<ContextualContentSuggestionsServiceProxy> CreateProxy();
private:
void BelowConfidenceThresholdFetchDone(
FetchClustersCallback callback,
ReportFetchMetricsCallback metrics_callback);
// Cache for images of contextual suggestions, needed by CachedImageFetcher.
std::unique_ptr<ntp_snippets::RemoteSuggestionsDatabase>
contextual_suggestions_database_;
// Cache of contextual suggestions fetch results, keyed by the context url.
ContextualSuggestionsCache fetch_cache_;
// Performs actual network request to fetch contextual suggestions.
std::unique_ptr<ContextualSuggestionsFetcher> contextual_suggestions_fetcher_;
std::unique_ptr<ntp_snippets::CachedImageFetcher> image_fetcher_;
std::unique_ptr<contextual_suggestions::ContextualSuggestionsReporterProvider>
reporter_provider_;
// Look up by ContentSuggestion::ID::id_within_category() aka std::string to
// get image URL.
std::map<std::string, GURL> image_url_by_id_;
DISALLOW_COPY_AND_ASSIGN(ContextualContentSuggestionsService);
};
} // namespace contextual_suggestions
#endif // COMPONENTS_NTP_SNIPPETS_CONTEXTUAL_REPORTING_CONTEXTUAL_CONTENT_SUGGESTIONS_SERVICE_H_
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