// Copyright (c) 2012 The Chromium 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 "chrome/browser/ui/libgtk2ui/gtk2_util.h"

#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include <gtk/gtk.h>

#include "base/command_line.h"
#include "base/environment.h"
#include "base/memory/scoped_ptr.h"
#include "ui/aura/window.h"
#include "ui/aura/window_tree_host.h"
#include "ui/base/accelerators/accelerator.h"
#include "ui/events/event_constants.h"
#include "ui/events/keycodes/keyboard_code_conversion_x.h"
#include "ui/gfx/size.h"

namespace {

const char kAuraTransientParent[] = "aura-transient-parent";

void CommonInitFromCommandLine(const CommandLine& command_line,
                               void (*init_func)(gint*, gchar***)) {
  const std::vector<std::string>& args = command_line.argv();
  int argc = args.size();
  scoped_ptr<char *[]> argv(new char *[argc + 1]);
  for (size_t i = 0; i < args.size(); ++i) {
    // TODO(piman@google.com): can gtk_init modify argv? Just being safe
    // here.
    argv[i] = strdup(args[i].c_str());
  }
  argv[argc] = NULL;
  char **argv_pointer = argv.get();

  init_func(&argc, &argv_pointer);
  for (size_t i = 0; i < args.size(); ++i) {
    free(argv[i]);
  }
}

}  // namespace

namespace libgtk2ui {

void GtkInitFromCommandLine(const CommandLine& command_line) {
  CommonInitFromCommandLine(command_line, gtk_init);
}

// TODO(erg): This method was copied out of shell_integration_linux.cc. Because
// of how this library is structured as a stand alone .so, we can't call code
// from browser and above.
std::string GetDesktopName(base::Environment* env) {
#if defined(GOOGLE_CHROME_BUILD)
  return "google-chrome.desktop";
#else  // CHROMIUM_BUILD
  // Allow $CHROME_DESKTOP to override the built-in value, so that development
  // versions can set themselves as the default without interfering with
  // non-official, packaged versions using the built-in value.
  std::string name;
  if (env->GetVar("CHROME_DESKTOP", &name) && !name.empty())
    return name;
  return "chromium-browser.desktop";
#endif
}

void SetAlwaysShowImage(GtkWidget* image_menu_item) {
  gtk_image_menu_item_set_always_show_image(
      GTK_IMAGE_MENU_ITEM(image_menu_item), TRUE);
}

guint GetGdkKeyCodeForAccelerator(const ui::Accelerator& accelerator) {
  // The second parameter is false because accelerator keys are expressed in
  // terms of the non-shift-modified key.
  return XKeysymForWindowsKeyCode(accelerator.key_code(), false);
}

GdkModifierType GetGdkModifierForAccelerator(
    const ui::Accelerator& accelerator) {
  int event_flag = accelerator.modifiers();
  int modifier = 0;
  if (event_flag & ui::EF_SHIFT_DOWN)
    modifier |= GDK_SHIFT_MASK;
  if (event_flag & ui::EF_CONTROL_DOWN)
    modifier |= GDK_CONTROL_MASK;
  if (event_flag & ui::EF_ALT_DOWN)
    modifier |= GDK_MOD1_MASK;
  return static_cast<GdkModifierType>(modifier);
}

int EventFlagsFromGdkState(guint state) {
  int flags = ui::EF_NONE;
  flags |= (state & GDK_LOCK_MASK) ? ui::EF_CAPS_LOCK_DOWN : ui::EF_NONE;
  flags |= (state & GDK_CONTROL_MASK) ? ui::EF_CONTROL_DOWN : ui::EF_NONE;
  flags |= (state & GDK_SHIFT_MASK) ? ui::EF_SHIFT_DOWN : ui::EF_NONE;
  flags |= (state & GDK_MOD1_MASK) ? ui::EF_ALT_DOWN : ui::EF_NONE;
  flags |= (state & GDK_BUTTON1_MASK) ? ui::EF_LEFT_MOUSE_BUTTON : ui::EF_NONE;
  flags |=
      (state & GDK_BUTTON2_MASK) ? ui::EF_MIDDLE_MOUSE_BUTTON : ui::EF_NONE;
  flags |= (state & GDK_BUTTON3_MASK) ? ui::EF_RIGHT_MOUSE_BUTTON : ui::EF_NONE;
  return flags;
}

void SetGtkTransientForAura(GtkWidget* dialog, aura::Window* parent) {
  if (!parent || !parent->GetHost())
    return;

  gtk_widget_realize(dialog);
  GdkWindow* gdk_window = gtk_widget_get_window(dialog);

  // TODO(erg): Check to make sure we're using X11 if wayland or some other
  // display server ever happens. Otherwise, this will crash.
  XSetTransientForHint(GDK_WINDOW_XDISPLAY(gdk_window),
                       GDK_WINDOW_XID(gdk_window),
                       parent->GetHost()->GetAcceleratedWidget());

  // We also set the |parent| as a property of |dialog|, so that we can unlink
  // the two later.
  g_object_set_data(G_OBJECT(dialog), kAuraTransientParent, parent);
}

aura::Window* GetAuraTransientParent(GtkWidget* dialog) {
  return reinterpret_cast<aura::Window*>(
      g_object_get_data(G_OBJECT(dialog), kAuraTransientParent));
}

void ClearAuraTransientParent(GtkWidget* dialog) {
  g_object_set_data(G_OBJECT(dialog), kAuraTransientParent, NULL);
}

GtkStateType GetGtkState(ui::NativeTheme::State state) {
  switch (state) {
    case ui::NativeTheme::kDisabled: return GTK_STATE_INSENSITIVE;
    case ui::NativeTheme::kHovered:  return GTK_STATE_PRELIGHT;
    case ui::NativeTheme::kNormal:   return GTK_STATE_NORMAL;
    case ui::NativeTheme::kPressed:  return GTK_STATE_ACTIVE;
    case ui::NativeTheme::kMaxState: NOTREACHED() << "Unknown state: " << state;
  }
  return GTK_STATE_NORMAL;
}

}  // namespace libgtk2ui