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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_AMBIENT_AMBIENT_PHOTO_CACHE_H_
#define ASH_AMBIENT_AMBIENT_PHOTO_CACHE_H_
#include <string>
#include "ash/ash_export.h"
#include "ash/public/cpp/ambient/proto/photo_cache_entry.pb.h"
#include "base/files/file_path.h"
#include "base/functional/callback_forward.h"
#include "base/memory/scoped_refptr.h"
namespace base {
class SequencedTaskRunner;
} // namespace base
namespace ash {
class AmbientAccessTokenController;
// Utilities for downloading and persisting photos for Ambient mode.
// Each cache entry is written to disk with filenames prefixed by |cache_index|.
namespace ambient_photo_cache {
// Each `Store` has a different directory (chosen internally) where ambient
// photos are saved. Caller provides this below to specify which cache
// directory to operate on.
enum class Store {
// Holds photos matching the most recent ambient topic source selected by
// the user (ex: gphotos, art gallery, etc).
kPrimary,
// Holds a small fixed set of stock photos that do not match the ambient
// topic source selected by the user. Only used if the primary store is
// empty.
kBackup
};
// Sets the `task_runner` that will be used internally for all file
// operations. Must be called once before any other cache functions.
ASH_EXPORT void SetFileTaskRunner(
scoped_refptr<base::SequencedTaskRunner> task_runner);
ASH_EXPORT void DownloadPhoto(
const std::string& url,
AmbientAccessTokenController& access_token_controller,
base::OnceCallback<void(std::string&&)> callback);
// Saves the photo at |url| to a temporary file and calls |callback| with a
// its path. If successful, the caller is responsible for deleting the
// temporary file when done using it. The returned path is empty on failure.
ASH_EXPORT void DownloadPhotoToTempFile(
const std::string& url,
AmbientAccessTokenController& access_token_controller,
base::OnceCallback<void(base::FilePath)> callback);
// Write photo cache to disk at |cache_index| and call |callback| when
// complete.
ASH_EXPORT void WritePhotoCache(Store store,
int cache_index,
const ::ambient::PhotoCacheEntry& cache_entry,
base::OnceClosure callback);
// Read the photo cache at |cache_index| and call |callback| when complete.
// If a particular cache fails to be read, |cache_entry| will be empty.
ASH_EXPORT void ReadPhotoCache(
Store store,
int cache_index,
base::OnceCallback<void(::ambient::PhotoCacheEntry cache_entry)> callback);
// Erase all stored files from disk.
ASH_EXPORT void Clear(Store store);
} // namespace ambient_photo_cache
} // namespace ash
#endif // ASH_AMBIENT_AMBIENT_PHOTO_CACHE_H_
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