// 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_COMPONENTS_MULTIDEVICE_REMOTE_DEVICE_CACHE_H_
#define CHROMEOS_COMPONENTS_MULTIDEVICE_REMOTE_DEVICE_CACHE_H_

#include <memory>
#include <unordered_map>

#include "base/macros.h"
#include "base/optional.h"
#include "chromeos/components/multidevice/remote_device.h"
#include "chromeos/components/multidevice/remote_device_ref.h"

namespace chromeos {

namespace multidevice {

// A simple cache of RemoteDeviceRefs. Note that if multiple calls to
// SetRemoteDevices() are provided different sets of devices, the set of devices
// returned by GetRemoteDevices() is the union of those different sets (i.e.,
// devices are not deleted from the cache).
class RemoteDeviceCache {
 public:
  class Factory {
   public:
    static Factory* Get();
    static void SetFactoryForTesting(Factory* test_factory);
    virtual ~Factory();
    virtual std::unique_ptr<RemoteDeviceCache> BuildInstance();

   private:
    static Factory* test_factory_;
  };

  virtual ~RemoteDeviceCache();

  void SetRemoteDevices(const RemoteDeviceList& remote_devices);

  RemoteDeviceRefList GetRemoteDevices() const;

  base::Optional<RemoteDeviceRef> GetRemoteDevice(
      const std::string& device_id) const;

 private:
  RemoteDeviceCache();

  std::unordered_map<std::string, std::shared_ptr<RemoteDevice>>
      remote_device_map_;

  DISALLOW_COPY_AND_ASSIGN(RemoteDeviceCache);
};

}  // namespace multidevice

}  // namespace chromeos

#endif  // CHROMEOS_COMPONENTS_MULTIDEVICE_REMOTE_DEVICE_CACHE_H_