#include "itemdetailmapper.h"

#include <QAbstractItemModel>
#include <QDataWidgetMapper>
#include <QGridLayout>
#include <QJsonArray>
#include <QJsonObject>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QSpinBox>
#include <QTableView>

#include "../widgethelper.h"

ItemDetailMapper::ItemDetailMapper(QTableView* tableView, QWidget* parent)
    : QWidget{parent} {
  /// model mapping
  m_mapper = std::make_unique<QDataWidgetMapper>(this);
  /// BUG: If multiple columns are changed not all changes are applied.
  ///     Multiple changes are set individually by calling setData().
  ///     Probably due to a conflicting dataChanged signal for too many roles&columns the data of
  ///     the remaining columns is reset before setData is called.
  ///     And a manual submit would also create multiple undo steps anyway.
  /// Workaround: ManualSubmit -> AutoSubmit
  // m_mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
  m_mapper->setSubmitPolicy(QDataWidgetMapper::AutoSubmit);

  qDebug() << "Setting model...";
  m_tableView      = tableView;
  m_model          = tableView->model();
  m_selectionModel = tableView->selectionModel();

  m_mapper->setModel(m_model);

  setupWidgets();

  setupConnections();
}

bool ItemDetailMapper::submit() { return m_mapper->submit(); }

void ItemDetailMapper::revert() { m_mapper->revert(); }

void ItemDetailMapper::onCurrentIndexChanged(const QModelIndex& current,
                                             const QModelIndex& /*previous*/) {
  if (!isEnabled()) {
    setEnabled(true);
  }
  m_mapper->setCurrentModelIndex(current);
  updateButtons(current.row());
  emitContentChanged(current);
}

void ItemDetailMapper::rowsInserted(const QModelIndex& parent, int start, int end) {
  updateButtons(m_mapper->currentIndex());
}

void ItemDetailMapper::rowsRemoved(const QModelIndex& parent, int start, int end) {
  if (m_model->rowCount() == 0) {
    clearControlWidgets();
  }

  updateButtons(m_mapper->currentIndex());
}

void ItemDetailMapper::toPrevious() {
  int currentRow            = m_selectionModel->currentIndex().row();
  QModelIndex previousIndex = m_selectionModel->currentIndex().siblingAtRow(currentRow - 1);
  if (previousIndex.isValid()) {
    m_selectionModel->setCurrentIndex(previousIndex, QItemSelectionModel::ClearAndSelect);
  }
}

void ItemDetailMapper::toNext() {
  int currentRow        = m_selectionModel->currentIndex().row();
  QModelIndex nextIndex = m_selectionModel->currentIndex().siblingAtRow(currentRow + 1);
  if (nextIndex.isValid()) {
    m_selectionModel->setCurrentIndex(nextIndex, QItemSelectionModel::ClearAndSelect);
  }
}

void ItemDetailMapper::updateButtons(int row) {
  m_previousButton->setEnabled(row > 0);
  m_nextButton->setEnabled(row < m_model->rowCount() - 1);
}

void ItemDetailMapper::emitContentChanged(const QModelIndex& currentIndex) {
  // BUG QR-Code isn't updated after changes through the ItemDetailMapper #18
  QString toStringText = "";
  if (currentIndex.isValid()) {
    toStringText = currentIndex.data(ToStringRole).toString();
  }
  emit contentChanged(toStringText);
}

void ItemDetailMapper::setupConnections() {
  m_mapper->setCurrentIndex(m_selectionModel->currentIndex().row());

  connect(m_model, &QAbstractItemModel::rowsInserted, this, &ItemDetailMapper::rowsInserted);
  connect(m_model, &QAbstractItemModel::rowsRemoved, this, &ItemDetailMapper::rowsRemoved);
  connect(m_selectionModel, &QItemSelectionModel::currentChanged, this,
          &ItemDetailMapper::onCurrentIndexChanged);

  updateButtons(m_selectionModel->currentIndex().row());
}

void ItemDetailMapper::setupNavigationButtons() {
  m_nextButton     = new QPushButton(tr("Ne&xt"));
  m_previousButton = new QPushButton(tr("&Previous"));

  connect(m_previousButton, &QAbstractButton::clicked, this, &ItemDetailMapper::toPrevious);
  connect(m_nextButton, &QAbstractButton::clicked, this, &ItemDetailMapper::toNext);

  const int nRows = m_layout->rowCount();
  m_layout->addWidget(m_previousButton, nRows, 0);
  m_layout->addWidget(m_nextButton, nRows, 1);
}

void ItemDetailMapper::setupWidgets() {
  m_layout = new QGridLayout();

  for (int i = 0; i < USER_FACING_ROLES.size(); ++i) {
    setupWidgetPairForColumn(i);
  }
  setupNavigationButtons();

  setLayout(m_layout);
}

void ItemDetailMapper::setupWidgetPairForColumn(const int column) {
  // REFACTOR consolidate ItemDetailMapper::setupWidgetPairForColumn(...)
  //          with NewItemDialog::setupWidgetPairForColumn(...)
  const UserRoles role = GET_ROLE_FOR_COLUMN(column);

  QWidget* control = WidgetHelper::createControlWidget(role, this);

  const QString string = QString("&%1").arg(GET_HEADER_FOR_COLUMN(column));
  QLabel* label        = new QLabel(string);
  label->setBuddy(control);

  m_layout->addWidget(label, column, 0);
  m_layout->addWidget(control, column, 1);
  m_controlWidgets.append(control);

  if (TYPE_ROLES.contains(role)) {
    m_mapper->addMapping(control, column, "currentText");
  } else {
    m_mapper->addMapping(control, column);
  }
}

void ItemDetailMapper::clearControlWidgets() {
  setEnabled(false);

  for (int i = 0; i < m_controlWidgets.size(); ++i) {
    const UserRoles role = GET_ROLE_FOR_COLUMN(i);
    if (STRING_ROLES.contains(role)) {
      clearLineEdit(i);
    } else if (TYPE_ROLES.contains(role)) {
      clearComboBox(i);
    } else if (INT_ROLES.contains(role)) {
      clearSpinBox(i);
    } else if (DOUBLE_ROLES.contains(role)) {
      clearSpinBox(i);
    } else {
      qCritical() << "Could not reset content for control widget in column:" << i << "!";
    }
  }
}

void ItemDetailMapper::clearLineEdit(const int column) {
  QLineEdit* lineEdit = dynamic_cast<QLineEdit*>(m_controlWidgets[column]);
  if (lineEdit) {
    lineEdit->clear();
  }
}

void ItemDetailMapper::clearComboBox(const int column) {
  QComboBox* comboBox = dynamic_cast<QComboBox*>(m_controlWidgets[column]);
  if (comboBox) {
    comboBox->setCurrentText("");
  }
}

void ItemDetailMapper::clearSpinBox(const int column) {
  QAbstractSpinBox* spinBox = dynamic_cast<QAbstractSpinBox*>(m_controlWidgets[column]);
  if (spinBox) {
    spinBox->clear();
  }
}