// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_UI_WEBUI_SETTINGS_ACCESSIBILITY_MAIN_HANDLER_H_
#define CHROME_BROWSER_UI_WEBUI_SETTINGS_ACCESSIBILITY_MAIN_HANDLER_H_

#include "base/scoped_observation.h"
#include "build/build_config.h"
#include "chrome/browser/screen_ai/screen_ai_install_state.h"
#include "chrome/browser/ui/webui/settings/settings_page_ui_handler.h"

#if BUILDFLAG(IS_CHROMEOS)
#include "chrome/browser/ash/accessibility/accessibility_manager.h"
#endif  // BUILDFLAG(IS_CHROMEOS)

namespace settings {

// Settings handler for the main accessibility settings page,
// chrome://settings/accessibility.
class AccessibilityMainHandler
    : public ::settings::SettingsPageUIHandler,
      public screen_ai::ScreenAIInstallState::Observer {
 public:
  AccessibilityMainHandler();
  ~AccessibilityMainHandler() override;
  AccessibilityMainHandler(const AccessibilityMainHandler&) = delete;
  AccessibilityMainHandler& operator=(const AccessibilityMainHandler&) = delete;

  // SettingsPageUIHandler implementation.
  void RegisterMessages() override;
  void OnJavascriptAllowed() override;
  void OnJavascriptDisallowed() override;

  // screen_ai::ScreenAIInstallState::Observer:
  void DownloadProgressChanged(double progress) override;
  void StateChanged(screen_ai::ScreenAIInstallState::State state) override;

 private:
  void HandleGetScreenReaderState(const base::Value::List& args);
  void HandleCheckAccessibilityImageLabels(const base::Value::List& args);

  void HandleGetScreenAIInstallState(const base::Value::List& args);

  void SendScreenReaderStateChanged();

#if BUILDFLAG(IS_CHROMEOS)
  void OnAccessibilityStatusChanged(
      const ash::AccessibilityStatusEventDetails& details);

  base::CallbackListSubscription accessibility_subscription_;
#endif  // BUILDFLAG(IS_CHROMEOS)

  base::ScopedObservation<screen_ai::ScreenAIInstallState,
                          screen_ai::ScreenAIInstallState::Observer>
      component_ready_observer_{this};
};

}  // namespace settings

#endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_ACCESSIBILITY_MAIN_HANDLER_H_