// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef PLATFORM_API_DEVICE_INFO_H_
#define PLATFORM_API_DEVICE_INFO_H_

#include <cstddef>
#include <cstdint>
#include <functional>
#include <optional>
#include <string>

#include "absl/strings/string_view.h"
#include "internal/base/file_path.h"
#include "internal/base/files.h"

namespace nearby {
namespace api {

class DeviceInfo {
 public:
  enum class ScreenStatus { kUndetermined = 0, kLocked, kUnlocked };
  enum class DeviceType { kUnknown = 0, kPhone, kTablet, kLaptop };
  enum class OsType {
    kUnknown = 0,
    kAndroid,
    kChromeOs,
    kIos,
    kWindows,
    kMacOS
  };
  enum class SuspendResumeEvent { kSuspend, kResume };

  virtual ~DeviceInfo() = default;

  // Gets device name.
  virtual std::optional<std::string> GetOsDeviceName() const = 0;
  virtual DeviceType GetDeviceType() const = 0;
  virtual OsType GetOsType() const = 0;

  // Gets known paths of current user.
  virtual FilePath GetDownloadPath() const = 0;
  virtual FilePath GetLocalAppDataPath(FilePath sub_path) const = 0;
  virtual FilePath GetTemporaryPath() const = 0;
  virtual FilePath GetLogPath() const = 0;

  virtual std::optional<size_t> GetAvailableDiskSpaceInBytes(
      const FilePath& path) const {
        return Files::GetAvailableDiskSpaceInBytes(path);
  };

  // Monitor screen status
  virtual bool IsScreenLocked() const = 0;
  virtual void RegisterScreenLockedListener(
      absl::string_view listener_name,
      std::function<void(ScreenStatus)> callback) = 0;
  virtual void UnregisterScreenLockedListener(
      absl::string_view listener_name) = 0;

  // Control device sleep
  virtual bool PreventSleep() = 0;
  virtual bool AllowSleep() = 0;

  // Monitor suspend/resume events.
  // Returns a listener id that can be used to unregister the listener.
  virtual int64_t RegisterSuspendResumeListener(
      std::function<void(SuspendResumeEvent)> callback) {
    return 0;
  }
  virtual void UnregisterSuspendResumeListener(int64_t listener_id) {}
};

template <typename Sink>
void AbslStringify(Sink& sink, DeviceInfo::DeviceType device_type) {
  switch (device_type) {
    case DeviceInfo::DeviceType::kUnknown:
      sink.Append("Unknown");
      return;
    case DeviceInfo::DeviceType::kPhone:
      sink.Append("Phone");
      return;
    case DeviceInfo::DeviceType::kTablet:
      sink.Append("Tablet");
      return;
    case DeviceInfo::DeviceType::kLaptop:
      sink.Append("PC");
      return;
  }
}

}  // namespace api
}  // namespace nearby

#endif  // PLATFORM_API_DEVICE_INFO_H_