// Copyright (c) 2019 Slack Technologies, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#include "shell/common/api/atom_api_native_theme.h"

#include "native_mate/dictionary.h"
#include "native_mate/object_template_builder.h"
#include "shell/common/node_includes.h"
#include "ui/gfx/color_utils.h"
#include "ui/native_theme/native_theme.h"

namespace electron {

namespace api {

NativeTheme::NativeTheme(v8::Isolate* isolate, ui::NativeTheme* theme)
    : theme_(theme) {
  theme_->AddObserver(this);
  Init(isolate);
}

NativeTheme::~NativeTheme() {
  theme_->RemoveObserver(this);
}

void NativeTheme::OnNativeThemeUpdated(ui::NativeTheme* theme) {
  Emit("updated");
}

bool NativeTheme::ShouldUseDarkColors() {
  return theme_->ShouldUseDarkColors();
}

bool NativeTheme::ShouldUseHighContrastColors() {
  return theme_->UsesHighContrastColors();
}

#if defined(OS_MACOSX)
const CFStringRef WhiteOnBlack = CFSTR("whiteOnBlack");
const CFStringRef UniversalAccessDomain = CFSTR("com.apple.universalaccess");
#endif

// TODO(MarshallOfSound): Implement for Linux
bool NativeTheme::ShouldUseInvertedColorScheme() {
#if defined(OS_MACOSX)
  CFPreferencesAppSynchronize(UniversalAccessDomain);
  Boolean keyExistsAndHasValidFormat = false;
  Boolean is_inverted = CFPreferencesGetAppBooleanValue(
      WhiteOnBlack, UniversalAccessDomain, &keyExistsAndHasValidFormat);
  if (!keyExistsAndHasValidFormat)
    return false;
  return is_inverted;
#else
  return color_utils::IsInvertedColorScheme();
#endif
}

// static
v8::Local<v8::Value> NativeTheme::Create(v8::Isolate* isolate) {
  ui::NativeTheme* theme = ui::NativeTheme::GetInstanceForNativeUi();
  return mate::CreateHandle(isolate, new NativeTheme(isolate, theme)).ToV8();
}

// static
void NativeTheme::BuildPrototype(v8::Isolate* isolate,
                                 v8::Local<v8::FunctionTemplate> prototype) {
  prototype->SetClassName(mate::StringToV8(isolate, "NativeTheme"));
  mate::ObjectTemplateBuilder(isolate, prototype->PrototypeTemplate())
      .SetProperty("shouldUseDarkColors", &NativeTheme::ShouldUseDarkColors)
      .SetProperty("shouldUseHighContrastColors",
                   &NativeTheme::ShouldUseHighContrastColors)
      .SetProperty("shouldUseInvertedColorScheme",
                   &NativeTheme::ShouldUseInvertedColorScheme);
}

}  // namespace api

}  // namespace electron

namespace {

void Initialize(v8::Local<v8::Object> exports,
                v8::Local<v8::Value> unused,
                v8::Local<v8::Context> context,
                void* priv) {
  v8::Isolate* isolate = context->GetIsolate();
  mate::Dictionary dict(isolate, exports);
  dict.Set("nativeTheme", electron::api::NativeTheme::Create(isolate));
  dict.Set("NativeTheme", electron::api::NativeTheme::GetConstructor(isolate)
                              ->GetFunction(context)
                              .ToLocalChecked());
}

}  // namespace

NODE_LINKED_MODULE_CONTEXT_AWARE(atom_common_native_theme, Initialize)