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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ASH_WALLPAPER_HANDLERS_SEA_PEN_FETCHER_H_
#define CHROME_BROWSER_ASH_WALLPAPER_HANDLERS_SEA_PEN_FETCHER_H_
#include <memory>
#include <optional>
#include <vector>
#include "ash/public/cpp/wallpaper/sea_pen_image.h"
#include "ash/webui/common/mojom/sea_pen.mojom-forward.h"
#include "base/functional/callback_forward.h"
#include "base/time/time.h"
#include "components/manta/manta_status.h"
#include "components/manta/proto/manta.pb.h"
#include "components/manta/snapper_provider.h"
namespace wallpaper_handlers {
// A class to fetch SeaPen images from a Google server. Used for both Wallpaper
// and VC Background.
class SeaPenFetcher {
public:
using OnFetchThumbnailsComplete = base::OnceCallback<void(
std::optional<std::vector<ash::SeaPenImage>> images,
manta::MantaStatusCode status_code)>;
using OnFetchWallpaperComplete =
base::OnceCallback<void(std::optional<ash::SeaPenImage> image)>;
// The number of thumbnails requested per call for text queries.
constexpr static size_t kNumTextThumbnailsRequested = 4;
// The number of thumbnails requested per call for template queries.
constexpr static size_t kNumTemplateThumbnailsRequested = 8;
// Timeout value for fetching SeaPen thumbnails and wallpaper. Requests that
// take longer than this will return with an error instead of completing.
constexpr static base::TimeDelta kRequestTimeout = base::Seconds(20);
SeaPenFetcher();
SeaPenFetcher(const SeaPenFetcher&) = delete;
SeaPenFetcher& operator=(const SeaPenFetcher&) = delete;
virtual ~SeaPenFetcher();
// Run `query` against the Manta API. `query` is required to be a valid UTF-8
// string no longer than `kMaximumGetSeaPenThumbnailsTextBytes`. Thumbnails
// are decoded and re-encoded in a sandboxed process for safety before being
// sent to the caller in `callback`.
virtual void FetchThumbnails(
manta::proto::FeatureName feature_name,
const ash::personalization_app::mojom::SeaPenQueryPtr& query,
OnFetchThumbnailsComplete callback) = 0;
// Calls the Manta API to fetch a higher resolution image of the thumbnail.
// Wallpaper image is decoded and re-encoded in a sandboxed process for safety
// before being sent to the caller in `callback`.
virtual void FetchWallpaper(
manta::proto::FeatureName feature_name,
const ash::SeaPenImage& thumbnail,
const ash::personalization_app::mojom::SeaPenQueryPtr& query,
OnFetchWallpaperComplete callback) = 0;
private:
// Allow delegate to view the constructor function.
friend class WallpaperFetcherDelegateImpl;
friend class SeaPenFetcherTest;
// Private forces creation via `WallpaperFetcherDelegate` to set up mocking
// in test code. `snapper_provider` may be null.
static std::unique_ptr<SeaPenFetcher> MakeSeaPenFetcher(
std::unique_ptr<manta::SnapperProvider> snapper_provider);
};
} // namespace wallpaper_handlers
#endif // CHROME_BROWSER_ASH_WALLPAPER_HANDLERS_SEA_PEN_FETCHER_H_
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