// Copyright (c) 2017 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.

#include "tests/cefclient/browser/views_style.h"

#include "include/cef_color_ids.h"
#include "include/views/cef_window.h"
#include "tests/cefclient/browser/main_context.h"

namespace client::views_style {

namespace {

cef_color_t g_background_color = 0;
cef_color_t g_background_hover_color = 0;
cef_color_t g_text_color = 0;

int GetShade(int component) {
  return (component < 127) ? component + 75 : component - 75;
}

void MaybeInitialize() {
  static bool initialized = false;
  if (initialized) {
    return;
  }

  g_background_color = MainContext::Get()->GetBackgroundColor();
  if (g_background_color != 0) {
    // Use a slightly modified shade of the background color for hover.
    g_background_hover_color =
        CefColorSetARGB(255, GetShade(CefColorGetR(g_background_color)),
                        GetShade(CefColorGetG(g_background_color)),
                        GetShade(CefColorGetB(g_background_color)));

    // Invert the background color for text.
    g_text_color = CefColorSetARGB(255, 255 - CefColorGetR(g_background_color),
                                   255 - CefColorGetG(g_background_color),
                                   255 - CefColorGetB(g_background_color));
  }

  initialized = true;
}

}  // namespace

bool IsSet() {
  MaybeInitialize();
  return g_background_color != 0;
}

void ApplyTo(CefRefPtr<CefMenuModel> menu_model) {
  if (!IsSet()) {
    return;
  }

  // All text except non-hovered accelerator gets the same color.
  menu_model->SetColorAt(-1, CEF_MENU_COLOR_TEXT, g_text_color);
  menu_model->SetColorAt(-1, CEF_MENU_COLOR_TEXT_HOVERED, g_text_color);
  menu_model->SetColorAt(-1, CEF_MENU_COLOR_TEXT_ACCELERATOR,
                         g_background_hover_color);
  menu_model->SetColorAt(-1, CEF_MENU_COLOR_TEXT_ACCELERATOR_HOVERED,
                         g_text_color);

  menu_model->SetColorAt(-1, CEF_MENU_COLOR_BACKGROUND, g_background_color);
  menu_model->SetColorAt(-1, CEF_MENU_COLOR_BACKGROUND_HOVERED,
                         g_background_hover_color);

  // Recursively color sub-menus.
  for (size_t i = 0; i < menu_model->GetCount(); ++i) {
    if (menu_model->GetTypeAt(i) == MENUITEMTYPE_SUBMENU) {
      ApplyTo(menu_model->GetSubMenuAt(i));
    }
  }
}

void ApplyTo(CefRefPtr<CefWindow> window) {
  if (!IsSet()) {
    return;
  }

  // Customize default background color.
  window->SetThemeColor(CEF_ColorPrimaryBackground, g_background_color);

  // Customize default menu colors.
  window->SetThemeColor(CEF_ColorMenuBackground, g_background_color);
  window->SetThemeColor(CEF_ColorMenuItemBackgroundHighlighted,
                        g_background_hover_color);
  window->SetThemeColor(CEF_ColorMenuItemBackgroundSelected,
                        g_background_hover_color);
  window->SetThemeColor(CEF_ColorMenuSeparator, g_text_color);
  window->SetThemeColor(CEF_ColorMenuItemForeground, g_text_color);
  window->SetThemeColor(CEF_ColorMenuItemForegroundHighlighted, g_text_color);
  window->SetThemeColor(CEF_ColorMenuItemForegroundSelected, g_text_color);

  // Customize default textfield colors.
  window->SetThemeColor(CEF_ColorTextfieldBackground, g_background_color);
  window->SetThemeColor(CEF_ColorTextfieldOutline, g_text_color);

  // Customize default Chrome toolbar colors.
  window->SetThemeColor(CEF_ColorToolbar, g_background_color);
  window->SetThemeColor(CEF_ColorToolbarText, g_text_color);
  window->SetThemeColor(CEF_ColorToolbarButtonIcon, g_text_color);
  window->SetThemeColor(CEF_ColorToolbarButtonText, g_text_color);
  window->SetThemeColor(CEF_ColorLocationBarBackground, g_background_color);
  window->SetThemeColor(CEF_ColorLocationBarBackgroundHovered,
                        g_background_hover_color);
  window->SetThemeColor(CEF_ColorOmniboxText, g_text_color);
}

void OnThemeChanged(CefRefPtr<CefView> view) {
  if (!IsSet()) {
    return;
  }

  if (auto button = view->AsButton()) {
    if (auto label_button = button->AsLabelButton()) {
      // All text except disabled gets the same color.
      label_button->SetEnabledTextColors(g_text_color);
      label_button->SetTextColor(CEF_BUTTON_STATE_DISABLED,
                                 g_background_hover_color);
    }
  } else if (auto textfield = view->AsTextfield()) {
    textfield->SetTextColor(g_text_color);
  }
}

}  // namespace client::views_style