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// Copyright 2015 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 <memory>
#include "base/callback_forward.h"
#include "base/macros.h"
#include "components/ntp_snippets/content_suggestions_provider.h"
namespace ntp_snippets {
class RemoteSuggestionsFetcher;
// Retrieves fresh content data (articles) from the server, stores them and
// provides them as content suggestions.
class RemoteSuggestionsProvider : public ContentSuggestionsProvider {
// TODO(jkrcal): Would be nice to get rid of this another level of statuses.
// Maybe possible while refactoring the RemoteSuggestionsStatusService? (and
// letting it notify both the SchedulingRemoteSuggestionsProvider and
// RemoteSuggestionsProviderImpl or just the scheduling one).
enum class ProviderStatus { ACTIVE, INACTIVE };
using ProviderStatusCallback =
base::RepeatingCallback<void(ProviderStatus status)>;
// Callback to notify with the result of a fetch.
// TODO(jkrcal): Change to OnceCallback? A OnceCallback does only have a
// move-constructor which seems problematic for google mock.
using FetchStatusCallback = base::Callback<void(Status status_code)>;
~RemoteSuggestionsProvider() override;
// Set a callback to be notified whenever the status of the provider changes.
// The initial change is also notified (switching from an initial undecided
// status). If the callback is set after the first change, it is called back
// immediately.
// TODO(treib): Get rid of unique_ptrs to callbacks.
virtual void SetProviderStatusCallback(
std::unique_ptr<ProviderStatusCallback> callback) = 0;
// Fetches suggestions from the server for all remote categories and replaces
// old suggestions by the new ones. The request to the server is performed as
// an background request. Background requests are used for actions not
// triggered by the user and have lower priority on the server. After the
// fetch finished, the provided |callback| will be triggered with the status
// of the fetch (unless nullptr).
virtual void RefetchInTheBackground(
std::unique_ptr<FetchStatusCallback> callback) = 0;
virtual const RemoteSuggestionsFetcher* suggestions_fetcher_for_debugging()
const = 0;
RemoteSuggestionsProvider(Observer* observer);
} // namespace ntp_snippets