/* This file is part of Clementine.
   Copyright 2010, David Sansome <me@davidsansome.com>

   Clementine is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Clementine is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "globalshortcutgrabber.h"
#include "globalshortcutssettingspage.h"
#include "ui_globalshortcutssettingspage.h"
#include "core/globalshortcuts.h"
#include "core/logging.h"
#include "core/utilities.h"
#include "ui/iconloader.h"
#include "ui/settingsdialog.h"

#include <QKeyEvent>
#include <QMessageBox>
#include <QProcess>
#include <QPushButton>
#include <QSettings>
#include <QShortcut>
#include <QtDebug>

GlobalShortcutsSettingsPage::GlobalShortcutsSettingsPage(SettingsDialog* dialog)
    : SettingsPage(dialog),
      ui_(new Ui_GlobalShortcutsSettingsPage),
      initialised_(false),
      grabber_(new GlobalShortcutGrabber) {
  ui_->setupUi(this);
  ui_->shortcut_options->setEnabled(false);
  ui_->list->header()->setSectionResizeMode(QHeaderView::ResizeToContents);
  setWindowIcon(IconLoader::Load("input-keyboard"));

  settings_.beginGroup(GlobalShortcuts::kSettingsGroup);

  connect(ui_->list,
          SIGNAL(currentItemChanged(QTreeWidgetItem*, QTreeWidgetItem*)),
          SLOT(ItemClicked(QTreeWidgetItem*)));
  connect(ui_->radio_none, SIGNAL(clicked()), SLOT(NoneClicked()));
  connect(ui_->radio_default, SIGNAL(clicked()), SLOT(DefaultClicked()));
  connect(ui_->radio_custom, SIGNAL(clicked()), SLOT(ChangeClicked()));
  connect(ui_->change, SIGNAL(clicked()), SLOT(ChangeClicked()));
  connect(ui_->gnome_open, SIGNAL(clicked()),
          SLOT(OpenGnomeKeybindingProperties()));
}

GlobalShortcutsSettingsPage::~GlobalShortcutsSettingsPage() { delete ui_; }

bool GlobalShortcutsSettingsPage::IsEnabled() const {
#ifdef Q_OS_MAC
  qLog(Debug) << Utilities::GetMacVersion();
  if (Utilities::GetMacVersion() < 6) {  // Leopard and earlier.
    return false;
  }
#endif

  return true;
}

void GlobalShortcutsSettingsPage::Load() {
  GlobalShortcuts* manager = dialog()->global_shortcuts_manager();

  if (!initialised_) {
    initialised_ = true;

    connect(ui_->mac_open, SIGNAL(clicked()), manager,
            SLOT(ShowMacAccessibilityDialog()));

    if (!manager->IsGsdAvailable()) {
      ui_->gnome_container->hide();
    }

    for (const GlobalShortcuts::Shortcut& s : manager->shortcuts().values()) {
      Shortcut shortcut;
      shortcut.s = s;
      shortcut.key = s.action->shortcut();
      shortcut.item = new QTreeWidgetItem(
          ui_->list, QStringList() << s.action->text()
                                   << s.action->shortcut().toString(
                                          QKeySequence::NativeText));
      shortcut.item->setData(0, Qt::UserRole, s.id);
      shortcuts_[s.id] = shortcut;
    }

    ui_->list->sortItems(0, Qt::AscendingOrder);
    ItemClicked(ui_->list->topLevelItem(0));
  }

  for (const Shortcut& s : shortcuts_.values()) {
    SetShortcut(s.s.id, s.s.action->shortcut());
  }

  bool use_gnome = settings_.value("use_gnome", true).toBool();
  if (ui_->gnome_container->isVisibleTo(this)) {
    ui_->gnome_checkbox->setChecked(use_gnome);
  }

  ui_->mac_container->setVisible(!manager->IsMacAccessibilityEnabled());
#ifdef Q_OS_DARWIN
  qint32 mac_version = Utilities::GetMacVersion();
  ui_->mac_label->setVisible(mac_version < 9);
  ui_->mac_label_mavericks->setVisible(mac_version >= 9);
#endif  // Q_OS_DARWIN
}

void GlobalShortcutsSettingsPage::SetShortcut(const QString& id,
                                              const QKeySequence& key) {
  Shortcut& shortcut = shortcuts_[id];

  shortcut.key = key;
  shortcut.item->setText(1, key.toString(QKeySequence::NativeText));
}

void GlobalShortcutsSettingsPage::Save() {
  for (const Shortcut& s : shortcuts_.values()) {
    s.s.action->setShortcut(s.key);
    s.s.shortcut->setKey(s.key);
    settings_.setValue(s.s.id, s.key.toString());
  }

  settings_.setValue("use_gnome", ui_->gnome_checkbox->isChecked());

  dialog()->global_shortcuts_manager()->ReloadSettings();
}

void GlobalShortcutsSettingsPage::ItemClicked(QTreeWidgetItem* item) {
  current_id_ = item->data(0, Qt::UserRole).toString();
  Shortcut& shortcut = shortcuts_[current_id_];

  // Enable options
  ui_->shortcut_options->setEnabled(true);
  ui_->shortcut_options->setTitle(
      tr("Shortcut for %1").arg(shortcut.s.action->text()));

  if (shortcut.key == shortcut.s.default_key)
    ui_->radio_default->setChecked(true);
  else if (shortcut.key.isEmpty())
    ui_->radio_none->setChecked(true);
  else
    ui_->radio_custom->setChecked(true);
}

void GlobalShortcutsSettingsPage::NoneClicked() {
  SetShortcut(current_id_, QKeySequence());
}

void GlobalShortcutsSettingsPage::DefaultClicked() {
  SetShortcut(current_id_, shortcuts_[current_id_].s.default_key);
}

void GlobalShortcutsSettingsPage::ChangeClicked() {
  GlobalShortcuts* manager = dialog()->global_shortcuts_manager();
  manager->Unregister();
  QKeySequence key = grabber_->GetKey(shortcuts_[current_id_].s.action->text());
  manager->Register();

  if (key.isEmpty()) return;

  // Check if this key sequence is used by any other actions
  for (const QString& id : shortcuts_.keys()) {
    if (shortcuts_[id].key == key) SetShortcut(id, QKeySequence());
  }

  ui_->radio_custom->setChecked(true);
  SetShortcut(current_id_, key);
}

void GlobalShortcutsSettingsPage::OpenGnomeKeybindingProperties() {
  if (!QProcess::startDetached("gnome-keybinding-properties")) {
    if (!QProcess::startDetached("gnome-control-center", QStringList()
                                                             << "keyboard")) {
      QMessageBox::warning(this, "Error",
                           tr("The \"%1\" command could not be started.")
                               .arg("gnome-keybinding-properties"));
    }
  }
}