// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_BACKGROUND_FETCH_STORAGE_START_NEXT_PENDING_REQUEST_TASK_H_
#define CONTENT_BROWSER_BACKGROUND_FETCH_STORAGE_START_NEXT_PENDING_REQUEST_TASK_H_

#include "base/functional/callback_forward.h"
#include "content/browser/background_fetch/background_fetch.pb.h"
#include "content/browser/background_fetch/background_fetch_request_info.h"
#include "content/browser/background_fetch/storage/database_task.h"
#include "content/common/background_fetch/background_fetch_types.h"
#include "third_party/blink/public/common/service_worker/service_worker_status_code.h"

namespace content {
namespace background_fetch {

// Gets a pending request for a given registration, and moves it
// to an active state.
class StartNextPendingRequestTask : public DatabaseTask {
 public:
  using NextRequestCallback =
      base::OnceCallback<void(blink::mojom::BackgroundFetchError,
                              scoped_refptr<BackgroundFetchRequestInfo>)>;

  StartNextPendingRequestTask(
      DatabaseTaskHost* host,
      const BackgroundFetchRegistrationId& registration_id,
      NextRequestCallback callback);

  StartNextPendingRequestTask(const StartNextPendingRequestTask&) = delete;
  StartNextPendingRequestTask& operator=(const StartNextPendingRequestTask&) =
      delete;

  ~StartNextPendingRequestTask() override;

  // DatabaseTask implementation:
  void Start() override;

 private:
  void GetPendingRequests();

  void DidGetPendingRequests(const std::vector<std::string>& data,
                             blink::ServiceWorkerStatusCode status);

  void DidFindActiveRequest(const std::vector<std::string>& data,
                            blink::ServiceWorkerStatusCode status);

  void DidStoreActiveRequest(blink::ServiceWorkerStatusCode status);

  void DidDeletePendingRequest(blink::ServiceWorkerStatusCode status);

  void FinishWithError(blink::mojom::BackgroundFetchError error) override;

  BackgroundFetchRegistrationId registration_id_;
  NextRequestCallback callback_;

  // protos don't support move semantics, so these class members will be used
  // to avoid unnecessary copying within callbacks.
  proto::BackgroundFetchPendingRequest pending_request_;
  proto::BackgroundFetchActiveRequest active_request_;

  scoped_refptr<BackgroundFetchRequestInfo> next_request_;

  base::WeakPtrFactory<StartNextPendingRequestTask> weak_factory_{
      this};  // Keep as last.
};

}  // namespace background_fetch
}  // namespace content

#endif  // CONTENT_BROWSER_BACKGROUND_FETCH_STORAGE_START_NEXT_PENDING_REQUEST_TASK_H_