// 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 "ui/base/models/simple_menu_model.h"

#include <stddef.h>

#include "base/bind.h"
#include "base/location.h"
#include "base/metrics/histogram_functions.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/gfx/image/image.h"

namespace ui {

const int kSeparatorId = -1;

struct SimpleMenuModel::Item {
  int command_id;
  base::string16 label;
  base::string16 sublabel;
  base::string16 minor_text;
  gfx::Image icon;
  ItemType type;
  int group_id;
  MenuModel* submenu;
  ButtonMenuItemModel* button_model;
  MenuSeparatorType separator_type;
};

////////////////////////////////////////////////////////////////////////////////
// SimpleMenuModel::Delegate, public:

bool SimpleMenuModel::Delegate::IsCommandIdVisible(int command_id) const {
  return true;
}

bool SimpleMenuModel::Delegate::IsItemForCommandIdDynamic(
    int command_id) const {
  return false;
}

base::string16 SimpleMenuModel::Delegate::GetLabelForCommandId(
    int command_id) const {
  return base::string16();
}

base::string16 SimpleMenuModel::Delegate::GetSublabelForCommandId(
    int command_id) const {
  return base::string16();
}

base::string16 SimpleMenuModel::Delegate::GetMinorTextForCommandId(
    int command_id) const {
  return base::string16();
}

bool SimpleMenuModel::Delegate::GetIconForCommandId(
    int command_id, gfx::Image* image_skia) const {
  return false;
}

void SimpleMenuModel::Delegate::CommandIdHighlighted(int command_id) {
}

void SimpleMenuModel::Delegate::MenuWillShow(SimpleMenuModel* /*source*/) {
}

void SimpleMenuModel::Delegate::MenuClosed(SimpleMenuModel* /*source*/) {
}

bool SimpleMenuModel::Delegate::GetAcceleratorForCommandId(
    int command_id,
    ui::Accelerator* accelerator) const {
  return false;
}

////////////////////////////////////////////////////////////////////////////////
// SimpleMenuModel, public:

SimpleMenuModel::SimpleMenuModel(Delegate* delegate)
    : delegate_(delegate),
      menu_model_delegate_(NULL),
      method_factory_(this) {
}

SimpleMenuModel::~SimpleMenuModel() {
}

void SimpleMenuModel::AddItem(int command_id, const base::string16& label) {
  Item item = { command_id, label, base::string16(), base::string16(),
                gfx::Image(), TYPE_COMMAND, -1, NULL, NULL, NORMAL_SEPARATOR };
  AppendItem(item);
}

void SimpleMenuModel::AddItemWithStringId(int command_id, int string_id) {
  AddItem(command_id, l10n_util::GetStringUTF16(string_id));
}

void SimpleMenuModel::AddCheckItem(int command_id,
                                   const base::string16& label) {
  Item item = { command_id, label, base::string16(), base::string16(),
                gfx::Image(), TYPE_CHECK, -1, NULL, NULL, NORMAL_SEPARATOR };
  AppendItem(item);
}

void SimpleMenuModel::AddCheckItemWithStringId(int command_id, int string_id) {
  AddCheckItem(command_id, l10n_util::GetStringUTF16(string_id));
}

void SimpleMenuModel::AddRadioItem(int command_id,
                                   const base::string16& label,
                                   int group_id) {
  Item item = { command_id, label, base::string16(), base::string16(),
                gfx::Image(), TYPE_RADIO, group_id, NULL, NULL,
                NORMAL_SEPARATOR };
  AppendItem(item);
}

void SimpleMenuModel::AddRadioItemWithStringId(int command_id, int string_id,
                                               int group_id) {
  AddRadioItem(command_id, l10n_util::GetStringUTF16(string_id), group_id);
}

void SimpleMenuModel::AddSeparator(MenuSeparatorType separator_type) {
  if (items_.empty()) {
    if (separator_type == NORMAL_SEPARATOR) {
      return;
    }
    DCHECK_EQ(SPACING_SEPARATOR, separator_type);
  } else if (items_.back().type == TYPE_SEPARATOR) {
    DCHECK_EQ(NORMAL_SEPARATOR, separator_type);
    DCHECK_EQ(NORMAL_SEPARATOR, items_.back().separator_type);
    return;
  }
#if !defined(USE_AURA)
  if (separator_type == SPACING_SEPARATOR)
    NOTIMPLEMENTED();
#endif
  Item item = { kSeparatorId, base::string16(), base::string16(),
                base::string16(), gfx::Image(), TYPE_SEPARATOR, -1, NULL, NULL,
                separator_type };
  AppendItem(item);
}

void SimpleMenuModel::AddButtonItem(int command_id,
                                    ButtonMenuItemModel* model) {
  Item item = { command_id, base::string16(), base::string16(),
                base::string16(), gfx::Image(), TYPE_BUTTON_ITEM, -1, NULL,
                model, NORMAL_SEPARATOR };
  AppendItem(item);
}

void SimpleMenuModel::AddSubMenu(int command_id,
                                 const base::string16& label,
                                 MenuModel* model) {
  Item item = { command_id, label, base::string16(), base::string16(),
                gfx::Image(), TYPE_SUBMENU, -1, model, NULL, NORMAL_SEPARATOR };
  AppendItem(item);
}

void SimpleMenuModel::AddSubMenuWithStringId(int command_id,
                                             int string_id, MenuModel* model) {
  AddSubMenu(command_id, l10n_util::GetStringUTF16(string_id), model);
}

void SimpleMenuModel::InsertItemAt(int index,
                                   int command_id,
                                   const base::string16& label) {
  Item item = { command_id, label, base::string16(), base::string16(),
                gfx::Image(), TYPE_COMMAND, -1, NULL, NULL, NORMAL_SEPARATOR };
  InsertItemAtIndex(item, index);
}

void SimpleMenuModel::InsertItemWithStringIdAt(
    int index, int command_id, int string_id) {
  InsertItemAt(index, command_id, l10n_util::GetStringUTF16(string_id));
}

void SimpleMenuModel::InsertSeparatorAt(int index,
                                        MenuSeparatorType separator_type) {
#if !defined(USE_AURA)
  if (separator_type != NORMAL_SEPARATOR) {
    NOTIMPLEMENTED();
  }
#endif
  Item item = { kSeparatorId, base::string16(), base::string16(),
                base::string16(), gfx::Image(), TYPE_SEPARATOR, -1, NULL, NULL,
                separator_type };
  InsertItemAtIndex(item, index);
}

void SimpleMenuModel::InsertCheckItemAt(int index,
                                        int command_id,
                                        const base::string16& label) {
  Item item = { command_id, label, base::string16(), base::string16(),
                gfx::Image(), TYPE_CHECK, -1, NULL, NULL, NORMAL_SEPARATOR };
  InsertItemAtIndex(item, index);
}

void SimpleMenuModel::InsertCheckItemWithStringIdAt(
    int index, int command_id, int string_id) {
  InsertCheckItemAt(index, command_id, l10n_util::GetStringUTF16(string_id));
}

void SimpleMenuModel::InsertRadioItemAt(int index,
                                        int command_id,
                                        const base::string16& label,
                                        int group_id) {
  Item item = { command_id, label, base::string16(), base::string16(),
                gfx::Image(), TYPE_RADIO, group_id, NULL, NULL,
                NORMAL_SEPARATOR };
  InsertItemAtIndex(item, index);
}

void SimpleMenuModel::InsertRadioItemWithStringIdAt(
    int index, int command_id, int string_id, int group_id) {
  InsertRadioItemAt(
      index, command_id, l10n_util::GetStringUTF16(string_id), group_id);
}

void SimpleMenuModel::InsertSubMenuAt(int index,
                                      int command_id,
                                      const base::string16& label,
                                      MenuModel* model) {
  Item item = { command_id, label, base::string16(), base::string16(),
                gfx::Image(), TYPE_SUBMENU, -1, model, NULL,
                NORMAL_SEPARATOR };
  InsertItemAtIndex(item, index);
}

void SimpleMenuModel::InsertSubMenuWithStringIdAt(
    int index, int command_id, int string_id, MenuModel* model) {
  InsertSubMenuAt(index, command_id, l10n_util::GetStringUTF16(string_id),
                  model);
}

void SimpleMenuModel::RemoveItemAt(int index) {
  items_.erase(items_.begin() + ValidateItemIndex(index));
  MenuItemsChanged();
}

void SimpleMenuModel::SetIcon(int index, const gfx::Image& icon) {
  items_[ValidateItemIndex(index)].icon = icon;
  MenuItemsChanged();
}

void SimpleMenuModel::SetSublabel(int index, const base::string16& sublabel) {
  items_[ValidateItemIndex(index)].sublabel = sublabel;
  MenuItemsChanged();
}

void SimpleMenuModel::SetMinorText(int index,
                                   const base::string16& minor_text) {
  items_[ValidateItemIndex(index)].minor_text = minor_text;
}

void SimpleMenuModel::Clear() {
  items_.clear();
  MenuItemsChanged();
}

int SimpleMenuModel::GetIndexOfCommandId(int command_id) const {
  for (ItemVector::const_iterator i = items_.begin(); i != items_.end(); ++i) {
    if (i->command_id == command_id)
      return static_cast<int>(std::distance(items_.begin(), i));
  }
  return -1;
}

////////////////////////////////////////////////////////////////////////////////
// SimpleMenuModel, MenuModel implementation:

bool SimpleMenuModel::HasIcons() const {
  for (ItemVector::const_iterator i = items_.begin(); i != items_.end(); ++i) {
    if (!i->icon.IsEmpty())
      return true;
  }

  return false;
}

int SimpleMenuModel::GetItemCount() const {
  return static_cast<int>(items_.size());
}

MenuModel::ItemType SimpleMenuModel::GetTypeAt(int index) const {
  return items_[ValidateItemIndex(index)].type;
}

ui::MenuSeparatorType SimpleMenuModel::GetSeparatorTypeAt(int index) const {
  return items_[ValidateItemIndex(index)].separator_type;
}

int SimpleMenuModel::GetCommandIdAt(int index) const {
  return items_[ValidateItemIndex(index)].command_id;
}

base::string16 SimpleMenuModel::GetLabelAt(int index) const {
  if (IsItemDynamicAt(index))
    return delegate_->GetLabelForCommandId(GetCommandIdAt(index));
  return items_[ValidateItemIndex(index)].label;
}

base::string16 SimpleMenuModel::GetSublabelAt(int index) const {
  if (IsItemDynamicAt(index))
    return delegate_->GetSublabelForCommandId(GetCommandIdAt(index));
  return items_[ValidateItemIndex(index)].sublabel;
}

base::string16 SimpleMenuModel::GetMinorTextAt(int index) const {
  if (IsItemDynamicAt(index))
    return delegate_->GetMinorTextForCommandId(GetCommandIdAt(index));
  return items_[ValidateItemIndex(index)].minor_text;
}

bool SimpleMenuModel::IsItemDynamicAt(int index) const {
  if (delegate_)
    return delegate_->IsItemForCommandIdDynamic(GetCommandIdAt(index));
  return false;
}

bool SimpleMenuModel::GetAcceleratorAt(int index,
                                       ui::Accelerator* accelerator) const {
  if (delegate_) {
    return delegate_->GetAcceleratorForCommandId(GetCommandIdAt(index),
                                                 accelerator);
  }
  return false;
}

bool SimpleMenuModel::IsItemCheckedAt(int index) const {
  if (!delegate_)
    return false;
  MenuModel::ItemType item_type = GetTypeAt(index);
  return (item_type == TYPE_CHECK || item_type == TYPE_RADIO) ?
      delegate_->IsCommandIdChecked(GetCommandIdAt(index)) : false;
}

int SimpleMenuModel::GetGroupIdAt(int index) const {
  return items_[ValidateItemIndex(index)].group_id;
}

bool SimpleMenuModel::GetIconAt(int index, gfx::Image* icon) {
  if (IsItemDynamicAt(index))
    return delegate_->GetIconForCommandId(GetCommandIdAt(index), icon);

  ValidateItemIndex(index);
  if (items_[index].icon.IsEmpty())
    return false;

  *icon = items_[index].icon;
  return true;
}

ButtonMenuItemModel* SimpleMenuModel::GetButtonMenuItemAt(int index) const {
  return items_[ValidateItemIndex(index)].button_model;
}

bool SimpleMenuModel::IsEnabledAt(int index) const {
  int command_id = GetCommandIdAt(index);
  if (!delegate_ || command_id == kSeparatorId || GetButtonMenuItemAt(index))
    return true;
  return delegate_->IsCommandIdEnabled(command_id);
}

bool SimpleMenuModel::IsVisibleAt(int index) const {
  int command_id = GetCommandIdAt(index);
  if (!delegate_ || command_id == kSeparatorId || GetButtonMenuItemAt(index))
    return true;
  return delegate_->IsCommandIdVisible(command_id);
}

void SimpleMenuModel::HighlightChangedTo(int index) {
  if (delegate_)
    delegate_->CommandIdHighlighted(GetCommandIdAt(index));
}

void SimpleMenuModel::ActivatedAt(int index) {
  ActivatedAt(index, 0);
}

void SimpleMenuModel::ActivatedAt(int index, int event_flags) {
  if (!delegate_)
    return;

  int command_id = GetCommandIdAt(index);
  RecordHistogram(command_id);
  delegate_->ExecuteCommand(command_id, event_flags);
}

MenuModel* SimpleMenuModel::GetSubmenuModelAt(int index) const {
  return items_[ValidateItemIndex(index)].submenu;
}

void SimpleMenuModel::MenuWillShow() {
  if (delegate_)
    delegate_->MenuWillShow(this);
}

void SimpleMenuModel::MenuWillClose() {
  // Due to how menus work on the different platforms, ActivatedAt will be
  // called after this.  It's more convenient for the delegate to be called
  // afterwards though, so post a task.
  base::ThreadTaskRunnerHandle::Get()->PostTask(
      FROM_HERE,
      base::Bind(&SimpleMenuModel::OnMenuClosed, method_factory_.GetWeakPtr()));
}

void SimpleMenuModel::SetMenuModelDelegate(
      ui::MenuModelDelegate* menu_model_delegate) {
  menu_model_delegate_ = menu_model_delegate;
}

MenuModelDelegate* SimpleMenuModel::GetMenuModelDelegate() const {
  return menu_model_delegate_;
}

void SimpleMenuModel::OnMenuClosed() {
  if (delegate_)
    delegate_->MenuClosed(this);
}

////////////////////////////////////////////////////////////////////////////////
// SimpleMenuModel, Protected:

void SimpleMenuModel::MenuItemsChanged() {
}

////////////////////////////////////////////////////////////////////////////////
// SimpleMenuModel, Private:

int SimpleMenuModel::ValidateItemIndex(int index) const {
  CHECK_GE(index, 0);
  CHECK_LT(static_cast<size_t>(index), items_.size());
  return index;
}

void SimpleMenuModel::AppendItem(const Item& item) {
  ValidateItem(item);
  items_.push_back(item);
  MenuItemsChanged();
}

void SimpleMenuModel::InsertItemAtIndex(const Item& item, int index) {
  ValidateItem(item);
  items_.insert(items_.begin() + index, item);
  MenuItemsChanged();
}

void SimpleMenuModel::ValidateItem(const Item& item) {
#ifndef NDEBUG
  if (item.type == TYPE_SEPARATOR) {
    DCHECK_EQ(item.command_id, kSeparatorId);
  } else {
    DCHECK_GE(item.command_id, 0);
  }
#endif  // NDEBUG
}

void SimpleMenuModel::RecordHistogram(int command_id) const {
  if (histogram_name_.empty())
    return;
  base::UmaHistogramSparse(histogram_name_, command_id);
}

}  // namespace ui
