/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_a11y_ApplicationAccessible_h_
#define mozilla_a11y_ApplicationAccessible_h_

#include "AccessibleWrap.h"

#include "nsIXULAppInfo.h"

namespace mozilla {
namespace a11y {

/**
 * ApplicationAccessible is for the whole application of Mozilla.
 * Only one instance of ApplicationAccessible exists for one Mozilla instance.
 * And this one should be created when Mozilla Startup (if accessibility
 * feature has been enabled) and destroyed when Mozilla Shutdown.
 *
 * All the accessibility objects for toplevel windows are direct children of
 * the ApplicationAccessible instance.
 */

class ApplicationAccessible : public AccessibleWrap {
 public:
  ApplicationAccessible();

  NS_INLINE_DECL_REFCOUNTING_INHERITED(ApplicationAccessible, AccessibleWrap)

  // LocalAccessible
  virtual void Shutdown() override;
  virtual LayoutDeviceIntRect Bounds() const override;
  virtual nsRect BoundsInAppUnits() const override;
  virtual already_AddRefed<AccAttributes> NativeAttributes() override;
  virtual GroupPos GroupPosition() override;
  virtual ENameValueFlag DirectName(nsString& aName) const override;
  virtual void ApplyARIAState(uint64_t* aState) const override;
  virtual EDescriptionValueFlag Description(
      nsString& aDescription) const override;
  virtual void Value(nsString& aValue) const override;
  virtual mozilla::a11y::role NativeRole() const override;
  virtual uint64_t State() override;
  virtual uint64_t NativeState() const override;
  virtual Relation RelationByType(RelationType aType) const override;

  virtual LocalAccessible* LocalChildAtPoint(
      int32_t aX, int32_t aY, EWhichChildAtPoint aWhichChild) override;
  virtual Accessible* FocusedChild() override;

  // ActionAccessible
  virtual KeyBinding AccessKey() const override;

  // ApplicationAccessible
  void CreateInitialDocs();

  void AppName(nsAString& aName) const {
    MOZ_ASSERT(mAppInfo, "no application info");

    if (mAppInfo) {
      nsAutoCString cname;
      mAppInfo->GetName(cname);
      AppendUTF8toUTF16(cname, aName);
    }
  }

  void AppVersion(nsAString& aVersion) const {
    MOZ_ASSERT(mAppInfo, "no application info");

    if (mAppInfo) {
      nsAutoCString cversion;
      mAppInfo->GetVersion(cversion);
      AppendUTF8toUTF16(cversion, aVersion);
    }
  }

  void PlatformName(nsAString& aName) const { aName.AssignLiteral("Gecko"); }

  void PlatformVersion(nsAString& aVersion) const {
    MOZ_ASSERT(mAppInfo, "no application info");

    if (mAppInfo) {
      nsAutoCString cversion;
      mAppInfo->GetPlatformVersion(cversion);
      AppendUTF8toUTF16(cversion, aVersion);
    }
  }

 protected:
  virtual ~ApplicationAccessible() = default;

  // LocalAccessible
  virtual LocalAccessible* GetSiblingAtOffset(
      int32_t aOffset, nsresult* aError = nullptr) const override;

 private:
  nsCOMPtr<nsIXULAppInfo> mAppInfo;
};

inline ApplicationAccessible* LocalAccessible::AsApplication() {
  return IsApplication() ? static_cast<ApplicationAccessible*>(this) : nullptr;
}

}  // namespace a11y
}  // namespace mozilla

#endif