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#include "gui/config_dialog/keybinding_editor_delegate.h"

#include <QPushButton>
#include <QtGui>
#include <memory>

#include "absl/log/check.h"
#include "gui/config_dialog/keybinding_editor.h"

namespace mozc {
namespace gui {

class KeyBindingEditorTriggerButton : public QPushButton {
 public:
  explicit 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) {}

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 == nullptr) {
    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 == nullptr || button == nullptr) {
    return;
  }
  model->setData(index, button->mutable_editor()->GetBinding(), Qt::EditRole);
}

void KeyBindingEditorDelegate::updateEditorGeometry(
    QWidget *editor, const QStyleOptionViewItem &option,
    const QModelIndex &index) const {
  if (editor == nullptr) {
    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 == nullptr) {
    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 == nullptr) {
    return;
  }
  emit closeEditor(button);
}
}  // namespace gui
}  // namespace mozc
