// Copyright (c) 2009 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/chromeos/options/system_page_view.h"

#include <string>
#include <vector>

#include "app/combobox_model.h"
#include "base/stl_util-inl.h"
#include "chrome/browser/chromeos/cros/language_library.h"
#include "chrome/browser/pref_member.h"
#include "chrome/browser/profile.h"
#include "chrome/common/pref_names.h"
#include "grit/generated_resources.h"
#include "unicode/timezone.h"
#include "views/controls/button/checkbox.h"
#include "views/controls/combobox/combobox.h"
#include "views/controls/slider/slider.h"

namespace chromeos {

////////////////////////////////////////////////////////////////////////////////
// DateTimeSection

// Date/Time section for datetime settings
class DateTimeSection : public SettingsPageSection,
                        public views::Combobox::Listener {
 public:
  explicit DateTimeSection(Profile* profile);
  virtual ~DateTimeSection() {}

  // Overridden from views::Combobox::Listener:
  virtual void ItemChanged(views::Combobox* sender,
                           int prev_index,
                           int new_index);

 protected:
  // SettingsPageSection overrides:
  virtual void InitContents(GridLayout* layout);
  virtual void NotifyPrefChanged(const std::wstring* pref_name);

 private:
  // The combobox model for the list of timezones.
  class TimezoneComboboxModel : public ComboboxModel {
   public:
    TimezoneComboboxModel() {
      timezones_.push_back(icu::TimeZone::createTimeZone(
          icu::UnicodeString::fromUTF8("US/Pacific")));
      timezones_.push_back(icu::TimeZone::createTimeZone(
          icu::UnicodeString::fromUTF8("US/Mountain")));
      timezones_.push_back(icu::TimeZone::createTimeZone(
          icu::UnicodeString::fromUTF8("US/Central")));
      timezones_.push_back(icu::TimeZone::createTimeZone(
          icu::UnicodeString::fromUTF8("US/Eastern")));
      // For now, add all the GMT timezones.
      // We may eventually want to use icu::TimeZone::createEnumeration()
      // to list all the timezones and pick the ones we want to show.
      for (int i = 11; i >= -12; i--) {
        // For positive i's, add the extra '+'.
        std::string str = StringPrintf(i > 0 ? "Etc/GMT+%d" : "Etc/GMT%d", i);
        icu::TimeZone* timezone = icu::TimeZone::createTimeZone(
            icu::UnicodeString::fromUTF8(str.c_str()));
        timezones_.push_back(timezone);
      }
    }

    virtual ~TimezoneComboboxModel() {
      STLDeleteElements(&timezones_);
    }

    virtual int GetItemCount() {
      return static_cast<int>(timezones_.size());
    }

    virtual std::wstring GetItemAt(int index) {
      icu::UnicodeString name;
      timezones_[index]->getDisplayName(name);
      std::wstring output;
      UTF16ToWide(name.getBuffer(), name.length(), &output);
      return output;
    }

    virtual std::wstring GetTimeZoneIDAt(int index) {
      icu::UnicodeString id;
      timezones_[index]->getID(id);
      std::wstring output;
      UTF16ToWide(id.getBuffer(), id.length(), &output);
      return output;
    }

   private:
    std::vector<icu::TimeZone*> timezones_;

    DISALLOW_COPY_AND_ASSIGN(TimezoneComboboxModel);
  };

  // Selects the timezone.
  void SelectTimeZone(const std::wstring& id);

  // TimeZone combobox model.
  views::Combobox* timezone_combobox_;

  // Controls for this section:
  TimezoneComboboxModel timezone_combobox_model_;

  // Preferences for this section:
  StringPrefMember timezone_;

  DISALLOW_COPY_AND_ASSIGN(DateTimeSection);
};

DateTimeSection::DateTimeSection(Profile* profile)
    : SettingsPageSection(profile, IDS_OPTIONS_SETTINGS_SECTION_TITLE_DATETIME),
      timezone_combobox_(NULL) {
}

void DateTimeSection::ItemChanged(views::Combobox* sender,
                                  int prev_index,
                                  int new_index) {
  if (new_index == prev_index)
    return;
  timezone_.SetValue(timezone_combobox_model_.GetTimeZoneIDAt(new_index));
}

void DateTimeSection::InitContents(GridLayout* layout) {
  timezone_combobox_ = new views::Combobox(&timezone_combobox_model_);
  timezone_combobox_->set_listener(this);

  layout->StartRow(0, double_column_view_set_id());
  layout->AddView(new views::Label(
      l10n_util::GetString(IDS_OPTIONS_SETTINGS_TIMEZONE_DESCRIPTION)));
  layout->AddView(timezone_combobox_);
  layout->AddPaddingRow(0, kRelatedControlVerticalSpacing);

  // Init member prefs so we can update the controls if prefs change.
  timezone_.Init(prefs::kTimeZone, profile()->GetPrefs(), this);
}

void DateTimeSection::NotifyPrefChanged(const std::wstring* pref_name) {
  if (!pref_name || *pref_name == prefs::kTimeZone) {
    std::wstring timezone = timezone_.GetValue();
    SelectTimeZone(timezone);
  }
}

void DateTimeSection::SelectTimeZone(const std::wstring& id) {
  for (int i = 0; i < timezone_combobox_model_.GetItemCount(); i++) {
    if (timezone_combobox_model_.GetTimeZoneIDAt(i) == id) {
      timezone_combobox_->SetSelectedItem(i);
      return;
    }
  }
}

////////////////////////////////////////////////////////////////////////////////
// TouchpadSection

class TouchpadSection : public SettingsPageSection,
                        public views::ButtonListener,
                        public views::SliderListener {
 public:
  explicit TouchpadSection(Profile* profile);
  virtual ~TouchpadSection() {}

  // Overridden from views::ButtonListener:
  virtual void ButtonPressed(views::Button* sender, const views::Event& event);

  // Overridden from views::SliderListener:
  virtual void SliderValueChanged(views::Slider* sender);

 protected:
  // SettingsPageSection overrides:
  virtual void InitContents(GridLayout* layout);
  virtual void NotifyPrefChanged(const std::wstring* pref_name);

 private:
  // The View that contains the contents of the section.
  views::View* contents_;

  // Controls for this section:
  views::Checkbox* enable_tap_to_click_checkbox_;
  views::Checkbox* enable_vert_edge_scroll_checkbox_;
  views::Slider* speed_factor_slider_;
  views::Slider* sensitivity_slider_;

  // Preferences for this section:
  BooleanPrefMember tap_to_click_enabled_;
  BooleanPrefMember vert_edge_scroll_enabled_;
  IntegerPrefMember speed_factor_;
  IntegerPrefMember sensitivity_;

  DISALLOW_COPY_AND_ASSIGN(TouchpadSection);
};

TouchpadSection::TouchpadSection(Profile* profile)
    : SettingsPageSection(profile, IDS_OPTIONS_SETTINGS_SECTION_TITLE_TOUCHPAD),
      enable_tap_to_click_checkbox_(NULL),
      enable_vert_edge_scroll_checkbox_(NULL),
      speed_factor_slider_(NULL),
      sensitivity_slider_(NULL) {
}

void TouchpadSection::ButtonPressed(
    views::Button* sender, const views::Event& event) {
  if (sender == enable_tap_to_click_checkbox_) {
    bool enabled = enable_tap_to_click_checkbox_->checked();
    UserMetricsRecordAction(enabled ?
                                "Options_TapToClickCheckbox_Enable" :
                                "Options_TapToClickCheckbox_Disable",
                            profile()->GetPrefs());
    tap_to_click_enabled_.SetValue(enabled);
  } else if (sender == enable_vert_edge_scroll_checkbox_) {
    bool enabled = enable_vert_edge_scroll_checkbox_->checked();
    UserMetricsRecordAction(enabled ?
                                "Options_VertEdgeScrollCheckbox_Enable" :
                                "Options_VertEdgeScrollCheckbox_Disable",
                            profile()->GetPrefs());
    vert_edge_scroll_enabled_.SetValue(enabled);
  }
}

void TouchpadSection::SliderValueChanged(views::Slider* sender) {
  if (sender == speed_factor_slider_) {
    double value = speed_factor_slider_->value();
    UserMetricsRecordAction("Options_SpeedFactorSlider_Changed",
                            profile()->GetPrefs());
    speed_factor_.SetValue(value);
  } else if (sender == sensitivity_slider_) {
    double value = sensitivity_slider_->value();
    UserMetricsRecordAction("Options_SensitivitySlider_Changed",
                            profile()->GetPrefs());
    sensitivity_.SetValue(value);
  }
}

void TouchpadSection::InitContents(GridLayout* layout) {
  enable_tap_to_click_checkbox_ = new views::Checkbox(l10n_util::GetString(
      IDS_OPTIONS_SETTINGS_TAP_TO_CLICK_ENABLED_DESCRIPTION));
  enable_tap_to_click_checkbox_->set_listener(this);
  enable_tap_to_click_checkbox_->SetMultiLine(true);
  enable_vert_edge_scroll_checkbox_ = new views::Checkbox(l10n_util::GetString(
      IDS_OPTIONS_SETTINGS_VERT_EDGE_SCROLL_ENABLED_DESCRIPTION));
  enable_vert_edge_scroll_checkbox_->set_listener(this);
  enable_vert_edge_scroll_checkbox_->SetMultiLine(true);
  // Create speed factor slider with values between 1 and 10 step 1
  speed_factor_slider_ = new views::Slider(1, 10, 1,
      static_cast<views::Slider::StyleFlags>(
          views::Slider::STYLE_DRAW_VALUE |
          views::Slider::STYLE_UPDATE_ON_RELEASE),
      this);
  // Create sensitivity slider with values between 1 and 10 step 1
  sensitivity_slider_ = new views::Slider(1, 10, 1,
      static_cast<views::Slider::StyleFlags>(
          views::Slider::STYLE_DRAW_VALUE |
          views::Slider::STYLE_UPDATE_ON_RELEASE),
      this);

  layout->StartRow(0, double_column_view_set_id());
  layout->AddView(new views::Label(
      l10n_util::GetString(IDS_OPTIONS_SETTINGS_SENSITIVITY_DESCRIPTION)));
  layout->AddView(sensitivity_slider_);
  layout->AddPaddingRow(0, kRelatedControlVerticalSpacing);
  layout->StartRow(0, double_column_view_set_id());
  layout->AddView(new views::Label(
      l10n_util::GetString(IDS_OPTIONS_SETTINGS_SPEED_FACTOR_DESCRIPTION)));
  layout->AddView(speed_factor_slider_);
  layout->AddPaddingRow(0, kRelatedControlVerticalSpacing);
  layout->StartRow(0, single_column_view_set_id());
  layout->AddView(enable_tap_to_click_checkbox_);
  layout->AddPaddingRow(0, kRelatedControlVerticalSpacing);
  layout->StartRow(0, single_column_view_set_id());
  layout->AddView(enable_vert_edge_scroll_checkbox_);
  layout->AddPaddingRow(0, kUnrelatedControlVerticalSpacing);

  // Init member prefs so we can update the controls if prefs change.
  tap_to_click_enabled_.Init(prefs::kTapToClickEnabled,
                             profile()->GetPrefs(), this);
  vert_edge_scroll_enabled_.Init(prefs::kVertEdgeScrollEnabled,
                                 profile()->GetPrefs(), this);
  speed_factor_.Init(prefs::kTouchpadSpeedFactor,
                     profile()->GetPrefs(), this);
  sensitivity_.Init(prefs::kTouchpadSensitivity,
                    profile()->GetPrefs(), this);
}

void TouchpadSection::NotifyPrefChanged(const std::wstring* pref_name) {
  if (!pref_name || *pref_name == prefs::kTapToClickEnabled) {
    bool enabled =  tap_to_click_enabled_.GetValue();
    enable_tap_to_click_checkbox_->SetChecked(enabled);
  }
  if (!pref_name || *pref_name == prefs::kVertEdgeScrollEnabled) {
    bool enabled =  vert_edge_scroll_enabled_.GetValue();
    enable_vert_edge_scroll_checkbox_->SetChecked(enabled);
  }
  if (!pref_name || *pref_name == prefs::kTouchpadSpeedFactor) {
    double value =  speed_factor_.GetValue();
    speed_factor_slider_->SetValue(value);
  }
  if (!pref_name || *pref_name == prefs::kTouchpadSensitivity) {
    double value =  sensitivity_.GetValue();
    sensitivity_slider_->SetValue(value);
  }
}

////////////////////////////////////////////////////////////////////////////////
// TextInputSection

// This is a checkbox associated with input language information.
class LanguageCheckbox : public views::Checkbox {
 public:
  explicit LanguageCheckbox(const InputLanguage& language)
      : views::Checkbox(UTF8ToWide(language.display_name)),
        language_(language) {
  }

  const InputLanguage& language() const {
    return language_;
  }

 private:
  InputLanguage language_;
  DISALLOW_COPY_AND_ASSIGN(LanguageCheckbox);
};

// TextInput section for text input settings.
class TextInputSection : public SettingsPageSection,
                         public views::ButtonListener,
                         public views::Combobox::Listener {
 public:
  explicit TextInputSection(Profile* profile);
  virtual ~TextInputSection() {}

 private:
  // Overridden from SettingsPageSection:
  virtual void InitContents(GridLayout* layout);

  // Overridden from views::ButtonListener:
  virtual void ButtonPressed(views::Button* sender,
                             const views::Event& event);

  // Overridden from views::Combobox::Listener:
  virtual void ItemChanged(views::Combobox* sender,
                           int prev_index,
                           int new_index);

  void UpdateHangulKeyboardCombobox();

  // The combobox model for the list of hangul keyboards.
  class HangulKeyboardComboboxModel : public ComboboxModel {
   public:
    HangulKeyboardComboboxModel() {
      // We have to sync the IDs ("2", "3f", "39", ...) with those in
      // ibus-hangul/setup/main.py.
      // TODO(yusukes): Use l10n_util::GetString for these label strings.
      layouts_.push_back(std::make_pair(L"Dubeolsik", "2"));
      layouts_.push_back(std::make_pair(L"Sebeolsik Final", "3f"));
      layouts_.push_back(std::make_pair(L"Sebeolsik 390", "39"));
      layouts_.push_back(std::make_pair(L"Sebeolsik No-shift", "3s"));
      layouts_.push_back(std::make_pair(L"Sebeolsik 2 set", "32"));
    }

    // Implements ComboboxModel interface.
    virtual int GetItemCount() {
      return static_cast<int>(layouts_.size());
    }

    // Implements ComboboxModel interface.
    virtual std::wstring GetItemAt(int index) {
      if (index < 0 || index > GetItemCount()) {
        LOG(ERROR) << "Index is out of bounds: " << index;
        return L"";
      }
      return layouts_.at(index).first;
    }

    // Gets a keyboard layout ID (e.g. "2", "3f", ..) for an item at zero-origin
    // |index|. This function is NOT part of the ComboboxModel interface.
    std::string GetItemIDAt(int index) {
      if (index < 0 || index > GetItemCount()) {
        LOG(ERROR) << "Index is out of bounds: " << index;
        return "";
      }
      return layouts_.at(index).second;
    }

    // Gets an index (>= 0) of an item whose keyboard layout ID is |layout_ld|.
    // Returns -1 if such item is not found. This function is NOT part of the
    // ComboboxModel interface.
    int GetIndexFromID(const std::string& layout_id) {
      for (size_t i = 0; i < layouts_.size(); ++i) {
        if (GetItemIDAt(i) == layout_id) {
          return static_cast<int>(i);
        }
      }
      return -1;
    }

   private:
    std::vector<std::pair<std::wstring, std::string> > layouts_;

    DISALLOW_COPY_AND_ASSIGN(HangulKeyboardComboboxModel);
  };

  // GConf config path names for the Korean IME.
  static const char kHangulSection[];
  static const char kHangulKeyboardConfigName[];

  // A combobox for Hangul keyboard layouts and its model.
  views::Combobox* hangul_keyboard_combobox_;
  HangulKeyboardComboboxModel hangul_keyboard_combobox_model_;

  DISALLOW_COPY_AND_ASSIGN(TextInputSection);
};

const char TextInputSection::kHangulSection[] = "engine/Hangul";
const char TextInputSection::kHangulKeyboardConfigName[] = "HangulKeyboard";

TextInputSection::TextInputSection(Profile* profile)
    : SettingsPageSection(profile,
                          IDS_OPTIONS_SETTINGS_SECTION_TITLE_TEXT_INPUT),
      hangul_keyboard_combobox_(NULL) {
}

void TextInputSection::ButtonPressed(
    views::Button* sender, const views::Event& event) {
  LanguageCheckbox* checkbox = static_cast<LanguageCheckbox*>(sender);
  const InputLanguage& language = checkbox->language();
  // Check if the checkbox is now being checked.
  if (checkbox->checked()) {
    // TODO(yusukes): limit the number of active languages so the pop-up menu
    //   of the language_menu_button does not overflow.

    // Try to activate the language.
    if (!LanguageLibrary::Get()->ActivateLanguage(language.category,
                                                  language.id)) {
      // Activation should never fail (failure means something is broken),
      // but if it fails we just revert the checkbox and ignore the error.
      // TODO(satorux): Implement a better error handling if it becomes
      // necessary.
      checkbox->SetChecked(false);
      LOG(ERROR) << "Failed to activate language: " << language.display_name;
    }
  } else {
    // Try to deactivate the language.
    if (!LanguageLibrary::Get()->DeactivateLanguage(language.category,
                                                    language.id)) {
      // See a comment above about the activation failure.
      checkbox->SetChecked(true);
      LOG(ERROR) << "Failed to deactivate language: " << language.display_name;
    }
  }
}

void TextInputSection::ItemChanged(
    views::Combobox* sender, int prev_index, int new_index) {
  ImeConfigValue config;
  config.type = ImeConfigValue::kValueTypeString;
  config.string_value = hangul_keyboard_combobox_model_.GetItemIDAt(new_index);
  LanguageLibrary::Get()->SetImeConfig(
      kHangulSection, kHangulKeyboardConfigName, config);

  UpdateHangulKeyboardCombobox();
}

void TextInputSection::InitContents(GridLayout* layout) {
  // GetActiveLanguages() and GetSupportedLanguages() never return NULL.
  scoped_ptr<InputLanguageList> active_language_list(
      LanguageLibrary::Get()->GetActiveLanguages());
  scoped_ptr<InputLanguageList> supported_language_list(
      LanguageLibrary::Get()->GetSupportedLanguages());

  for (size_t i = 0; i < supported_language_list->size(); ++i) {
    const InputLanguage& language = supported_language_list->at(i);
    // Check if |language| is active. Note that active_language_list is
    // small (usually a couple), so scanning here is fine.
    const bool language_is_active =
        (std::find(active_language_list->begin(),
                   active_language_list->end(),
                   language) != active_language_list->end());
    // Create a checkbox.
    LanguageCheckbox* checkbox = new LanguageCheckbox(language);
    checkbox->SetChecked(language_is_active);
    checkbox->set_listener(this);

    // Add the checkbox to the layout manager.
    layout->StartRow(0, single_column_view_set_id());
    layout->AddView(checkbox);
  }

  // Settings for IME engines.
  // TODO(yusukes): This is a temporary location of the settings. Ask UX team
  //   where is the best place for this and then move the code.
  // TODO(yusukes): Use l10n_util::GetString for all views::Labels.

  // Hangul IME
  hangul_keyboard_combobox_
      = new views::Combobox(&hangul_keyboard_combobox_model_);
  hangul_keyboard_combobox_->set_listener(this);
  UpdateHangulKeyboardCombobox();
  layout->AddPaddingRow(0, kRelatedControlVerticalSpacing);
  layout->StartRow(0, single_column_view_set_id());
  layout->AddView(new views::Label(L"Hangul IME"), 1, 1,
                  views::GridLayout::LEADING, views::GridLayout::LEADING);
  layout->StartRow(0, double_column_view_set_id());
  layout->AddView(new views::Label(L"Keyboard Layout"));
  layout->AddView(hangul_keyboard_combobox_);
}

void TextInputSection::UpdateHangulKeyboardCombobox() {
  DCHECK(hangul_keyboard_combobox_);
  ImeConfigValue config;
  if (LanguageLibrary::Get()->GetImeConfig(
          kHangulSection, kHangulKeyboardConfigName, &config)) {
    const int index
        = hangul_keyboard_combobox_model_.GetIndexFromID(config.string_value);
    if (index >= 0) {
      hangul_keyboard_combobox_->SetSelectedItem(index);
    }
  }
}

////////////////////////////////////////////////////////////////////////////////
// SystemPageView

////////////////////////////////////////////////////////////////////////////////
// SystemPageView, SettingsPageView implementation:

void SystemPageView::InitControlLayout() {
  GridLayout* layout = CreatePanelGridLayout(this);
  SetLayoutManager(layout);

  int single_column_view_set_id = 0;
  ColumnSet* column_set = layout->AddColumnSet(single_column_view_set_id);
  column_set->AddColumn(GridLayout::FILL, GridLayout::FILL, 1,
                        GridLayout::USE_PREF, 0, 0);

  layout->StartRow(0, single_column_view_set_id);
  layout->AddView(new DateTimeSection(profile()));
  layout->AddPaddingRow(0, kRelatedControlVerticalSpacing);
  layout->StartRow(0, single_column_view_set_id);
  layout->AddView(new TouchpadSection(profile()));
  layout->AddPaddingRow(0, kRelatedControlVerticalSpacing);
  layout->StartRow(0, single_column_view_set_id);
  layout->AddView(new TextInputSection(profile()));
  layout->AddPaddingRow(0, kRelatedControlVerticalSpacing);
}

}  // namespace chromeos