// Copyright (c) 2016 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#ifndef SHELL_BROWSER_API_ELECTRON_API_SYSTEM_PREFERENCES_H_
#define SHELL_BROWSER_API_ELECTRON_API_SYSTEM_PREFERENCES_H_

#include <memory>
#include <string>

#include "base/values.h"
#include "gin/handle.h"
#include "shell/common/gin_helper/error_thrower.h"
#include "shell/common/gin_helper/event_emitter.h"
#include "shell/common/gin_helper/promise.h"

#if defined(OS_WIN)
#include "shell/browser/browser.h"
#include "shell/browser/browser_observer.h"
#include "ui/gfx/sys_color_change_listener.h"
#endif

namespace electron {

namespace api {

#if defined(OS_MACOSX)
enum NotificationCenterKind {
  kNSDistributedNotificationCenter = 0,
  kNSNotificationCenter,
  kNSWorkspaceNotificationCenter,
};
#endif

class SystemPreferences : public gin_helper::EventEmitter<SystemPreferences>
#if defined(OS_WIN)
    ,
                          public BrowserObserver,
                          public gfx::SysColorChangeListener
#endif
{
 public:
  static gin::Handle<SystemPreferences> Create(v8::Isolate* isolate);

  static void BuildPrototype(v8::Isolate* isolate,
                             v8::Local<v8::FunctionTemplate> prototype);

#if defined(OS_WIN) || defined(OS_MACOSX)
  std::string GetAccentColor();
  std::string GetColor(gin_helper::ErrorThrower thrower,
                       const std::string& color);
  std::string GetMediaAccessStatus(const std::string& media_type,
                                   gin_helper::Arguments* args);
#endif
#if defined(OS_WIN)
  bool IsAeroGlassEnabled();

  void InitializeWindow();

  // gfx::SysColorChangeListener:
  void OnSysColorChange() override;

  // BrowserObserver:
  void OnFinishLaunching(const base::DictionaryValue& launch_info) override;

#elif defined(OS_MACOSX)
  using NotificationCallback = base::RepeatingCallback<
      void(const std::string&, base::DictionaryValue, const std::string&)>;

  void PostNotification(const std::string& name,
                        base::DictionaryValue user_info,
                        gin_helper::Arguments* args);
  int SubscribeNotification(const std::string& name,
                            const NotificationCallback& callback);
  void UnsubscribeNotification(int id);
  void PostLocalNotification(const std::string& name,
                             base::DictionaryValue user_info);
  int SubscribeLocalNotification(const std::string& name,
                                 const NotificationCallback& callback);
  void UnsubscribeLocalNotification(int request_id);
  void PostWorkspaceNotification(const std::string& name,
                                 base::DictionaryValue user_info);
  int SubscribeWorkspaceNotification(const std::string& name,
                                     const NotificationCallback& callback);
  void UnsubscribeWorkspaceNotification(int request_id);
  v8::Local<v8::Value> GetUserDefault(const std::string& name,
                                      const std::string& type);
  void RegisterDefaults(gin_helper::Arguments* args);
  void SetUserDefault(const std::string& name,
                      const std::string& type,
                      gin_helper::Arguments* args);
  void RemoveUserDefault(const std::string& name);
  bool IsSwipeTrackingFromScrollEventsEnabled();

  std::string GetSystemColor(gin_helper::ErrorThrower thrower,
                             const std::string& color);

  bool CanPromptTouchID();
  v8::Local<v8::Promise> PromptTouchID(v8::Isolate* isolate,
                                       const std::string& reason);

  static bool IsTrustedAccessibilityClient(bool prompt);

  v8::Local<v8::Promise> AskForMediaAccess(v8::Isolate* isolate,
                                           const std::string& media_type);

  // TODO(MarshallOfSound): Write tests for these methods once we
  // are running tests on a Mojave machine
  v8::Local<v8::Value> GetEffectiveAppearance(v8::Isolate* isolate);
  v8::Local<v8::Value> GetAppLevelAppearance(v8::Isolate* isolate);
  void SetAppLevelAppearance(gin_helper::Arguments* args);
#endif
  bool IsDarkMode();
  bool IsInvertedColorScheme();
  bool IsHighContrastColorScheme();
  v8::Local<v8::Value> GetAnimationSettings(v8::Isolate* isolate);

 protected:
  explicit SystemPreferences(v8::Isolate* isolate);
  ~SystemPreferences() override;

#if defined(OS_MACOSX)
  int DoSubscribeNotification(const std::string& name,
                              const NotificationCallback& callback,
                              NotificationCenterKind kind);
  void DoUnsubscribeNotification(int request_id, NotificationCenterKind kind);
#endif

 private:
#if defined(OS_WIN)
  // Static callback invoked when a message comes in to our messaging window.
  static LRESULT CALLBACK WndProcStatic(HWND hwnd,
                                        UINT message,
                                        WPARAM wparam,
                                        LPARAM lparam);

  LRESULT CALLBACK WndProc(HWND hwnd,
                           UINT message,
                           WPARAM wparam,
                           LPARAM lparam);

  // The window class of |window_|.
  ATOM atom_;

  // The handle of the module that contains the window procedure of |window_|.
  HMODULE instance_;

  // The window used for processing events.
  HWND window_;

  std::string current_color_;

  bool invertered_color_scheme_;

  bool high_contrast_color_scheme_;

  std::unique_ptr<gfx::ScopedSysColorChangeListener> color_change_listener_;
#endif
  DISALLOW_COPY_AND_ASSIGN(SystemPreferences);
};

}  // namespace api

}  // namespace electron

#endif  // SHELL_BROWSER_API_ELECTRON_API_SYSTEM_PREFERENCES_H_
