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#include "gui/config_dialog/keybinding_editor_delegate.h"

#include <QtGui/QtGui>
#include <QtWidgets/QPushButton>

#include <memory>

#include "base/logging.h"
#include "gui/config_dialog/keybinding_editor.h"

namespace mozc {
namespace gui {

class KeyBindingEditorTriggerButton : public QPushButton {
 public:
  KeyBindingEditorTriggerButton(QWidget *parent) :
      QPushButton(parent),
      editor_(new KeyBindingEditor(parent, this)) {
    editor_->setModal(true);   // create a modal dialog
    setFocusProxy(editor_.get());
    connect(this, SIGNAL(clicked()),
            editor_.get(), SLOT(show()));
  }

  KeyBindingEditor *mutable_editor() {
    return editor_.get();
  }

 private:
  std::unique_ptr<KeyBindingEditor> editor_;
};

KeyBindingEditorDelegate::KeyBindingEditorDelegate(QObject *parent)
    : QItemDelegate(parent) {}

KeyBindingEditorDelegate::~KeyBindingEditorDelegate() {}

QWidget *KeyBindingEditorDelegate::createEditor(
    QWidget *parent,
    const QStyleOptionViewItem &option,
    const QModelIndex &index) const {
  KeyBindingEditorTriggerButton *button
      = new KeyBindingEditorTriggerButton(parent);
  CHECK(button);
  connect(button->mutable_editor(), SIGNAL(accepted()),
          this, SLOT(CommitAndCloseEditor()));
  connect(button->mutable_editor(), SIGNAL(rejected()),
          this, SLOT(CloseEditor()));
  return button;
}

void KeyBindingEditorDelegate::setEditorData(
    QWidget *editor,
    const QModelIndex &index) const {
  const QString str = index.model()->data(index, Qt::EditRole).toString();
  KeyBindingEditorTriggerButton *button
      = static_cast<KeyBindingEditorTriggerButton *>(editor);
  if (button == NULL) {
    return;
  }
  button->setText(str);
  button->mutable_editor()->SetBinding(str);
}

void KeyBindingEditorDelegate::setModelData(
    QWidget *editor, QAbstractItemModel *model,
    const QModelIndex &index) const {
  KeyBindingEditorTriggerButton *button
      = static_cast<KeyBindingEditorTriggerButton *>(editor);
  if (model == NULL || button == NULL) {
    return;
  }
  model->setData(index,
                 button->mutable_editor()->GetBinding(),
                 Qt::EditRole);
}

void KeyBindingEditorDelegate::updateEditorGeometry(
    QWidget *editor,
    const QStyleOptionViewItem &option,
    const QModelIndex &index) const {
  if (editor == NULL) {
    return;
  }
  editor->setGeometry(option.rect);
}

void KeyBindingEditorDelegate::CommitAndCloseEditor() {
  KeyBindingEditor *editor = qobject_cast<KeyBindingEditor *>(sender());
  KeyBindingEditorTriggerButton *button =
      static_cast<KeyBindingEditorTriggerButton *>(
          editor->mutable_trigger_parent());
  if (button == NULL) {
    return;
  }
  emit commitData(button);
  emit closeEditor(button);
}

void KeyBindingEditorDelegate::CloseEditor() {
  KeyBindingEditor *editor = qobject_cast<KeyBindingEditor *>(sender());
  KeyBindingEditorTriggerButton *button =
      static_cast<KeyBindingEditorTriggerButton *>(
          editor->mutable_trigger_parent());
  if (button == NULL) {
    return;
  }
  emit closeEditor(button);
}
}  // namespace gui
}  // namespace mozc