// Copyright 2018 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 CHROMEOS_DBUS_SERVICES_CHROME_FEATURES_SERVICE_PROVIDER_H_
#define CHROMEOS_DBUS_SERVICES_CHROME_FEATURES_SERVICE_PROVIDER_H_

#include <memory>

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "chromeos/chromeos_export.h"
#include "chromeos/dbus/services/cros_dbus_service.h"
#include "dbus/exported_object.h"

namespace dbus {
class MethodCall;
}

namespace chromeos {

// This class exports D-Bus methods for querying Chrome Features enablement.
//
// IsCrostiniEnabled:
// % dbus-send --system --type=method_call --print-reply
//     --dest=org.chromium.ChromeFeaturesService
//     /org/chromium/ChromeFeaturesService
//     org.chromium.ChromeFeaturesServiceInterface.IsCrostiniEnabled
//
// % (returns true if Crostini is enabled, otherwise returns false)
class CHROMEOS_EXPORT ChromeFeaturesServiceProvider
    : public CrosDBusService::ServiceProviderInterface {
 public:
  // Delegate interface providing additional resources to
  // ChromeFeaturesServiceProvider.
  class Delegate {
   public:
    Delegate() {}
    virtual ~Delegate() {}

    virtual bool IsCrostiniEnabled(const std::string& user_id_hash) = 0;

   private:
    DISALLOW_COPY_AND_ASSIGN(Delegate);
  };

  explicit ChromeFeaturesServiceProvider(std::unique_ptr<Delegate> delegate);
  ~ChromeFeaturesServiceProvider() override;

  // CrosDBusService::ServiceProviderInterface overrides:
  void Start(scoped_refptr<dbus::ExportedObject> exported_object) override;

 private:
  // Called from ExportedObject when IsCrostiniEnabled() is exported as a D-Bus
  // method or failed to be exported.
  void OnExported(const std::string& interface_name,
                  const std::string& method_name,
                  bool success);

  // Called on UI thread in response to a D-Bus request.
  void IsCrostiniEnabled(dbus::MethodCall* method_call,
                         dbus::ExportedObject::ResponseSender response_sender);

  std::unique_ptr<Delegate> delegate_;
  // Keep this last so that all weak pointers will be invalidated at the
  // beginning of destruction.
  base::WeakPtrFactory<ChromeFeaturesServiceProvider> weak_ptr_factory_;

  DISALLOW_COPY_AND_ASSIGN(ChromeFeaturesServiceProvider);
};

}  // namespace chromeos

#endif  // CHROMEOS_DBUS_SERVICES_CHROME_FEATURES_SERVICE_PROVIDER_H_