#include "toonzqt/gutil.h"

#include "toonzqt/treemodel.h"

#include <qstringlist></qstringlist>

#include <qtreeview></qtreeview>

#include <qheaderview></qheaderview>

#include <qmouseevent></qmouseevent>

#include <qvariant.h></qvariant.h>

#include <qicon.h></qicon.h>

#include <qtextedit.h></qtextedit.h>

#include "tfx.h"

#include <assert.h></assert.h>

//====================================================================================================

// Item

//----------------------------------------------------------------------------------------------------

TreeModel::Item::Item()

    : m_model(0), m_parent(0), m_depth(0), m_row(0), m_opened(false) {}

//------------------------------------------------------------------------------------------------------------------

TreeModel::Item::~Item() {

  qDeleteAll(m_childItems);

  m_childItems.clear();

  m_model  = 0;

  m_row    = 0;

  m_depth  = 0;

  m_parent = 0;

}

//------------------------------------------------------------------------------------------------------------------

void TreeModel::Item::updateChild(Item *child, int row) {

  assert(m_model);

  child->m_model  = m_model;

  child->m_depth  = m_depth + 1;

  child->m_parent = this;

  child->m_row    = row;

}

//------------------------------------------------------------------------------------------------------------------

void TreeModel::Item::updateChildren() {

  int i;

  for (i = 0; i < m_childItems.size(); i++) updateChild(m_childItems[i], i);

}

//------------------------------------------------------------------------------------------------------------------

TreeModel::Item *TreeModel::Item::appendChild(TreeModel::Item *child) {

  assert(child);

  assert(!m_childItems.contains(child));

  updateChild(child, m_childItems.size());

  m_childItems.append(child);

  return child;

}

//------------------------------------------------------------------------------------------------------------------

/*

void TreeModel::Item::deleteChild(Item *child)

{

  int index = m_childItems.indexOf(child);

  if(index != -1)

  {

    m_childItems.takeAt(index);

    assert(!m_childItems.contains(child));

    // m_childItems is not supposed to contain duplicated entries

    delete child;

    updateChildren();

  }

}

*/

//------------------------------------------------------------------------------------------------------------------

/*

Item* matchItem(Item*item, QList<item*> &items)</item*>

{

  void *itemData = item->getInternalPointer();

  if(!itemData) return 0;

  int i;

  for(i=0;i

    if(items.at(i)->getInternalPointer()==itemData)

      return items.at(i);

  return 0;

}

*/

//------------------------------------------------------------------------------------------------------------------

void TreeModel::Item::setChildren(QList<item *=""> &newChildren) {</item>

  assert(m_model);

  QModelIndex itemIndex = createIndex();

  // save old children and clear 'm_childItems'

  QList<item *=""> oldChildren(m_childItems);</item>

  m_childItems.clear();

  int i;

  // for each child to add

  for (i = 0; i < newChildren.size(); i++) {

    Item *newChild           = newChildren.at(i);

    void *newInternalPointer = newChild->getInternalPointer();

    if (newInternalPointer != 0) {

      // search among old children

      int j;

      for (j = 0; j < oldChildren.size(); j++)

        if (oldChildren.at(j)->getInternalPointer() == newInternalPointer)

          break;

      if (j < oldChildren.size()) {

        Item *oldChild = oldChildren.takeAt(j);

        if (oldChild != newChild) {

          // Found! Delete newChild, remove it from 'newChildren' and

          // update consequently the index

          delete newChild;

          newChildren.takeAt(i);

          i--;

          // use the found child instead of the new one.

          newChild = oldChild;

          oldChild->refresh();

        } else {

          // should never happen; (if it happens this is not a big problem)

          assert(0);

        }

      }

    }

    // add the new child to 'm_childItems'

    m_childItems.push_back(newChild);

  }

  // update children model, row, parent, etc.

  updateChildren();

  // postpone item deletion to avoid the (possible) reuse of the

  // same pointer for the newly created items. (Pointers match is

  // used updating persistent indices. see: TreeModel::endRefresh())

  for (i = 0; i < oldChildren.size(); i++) {

    Item *itemToDelete = oldChildren[i];

    if (!m_model->m_itemsToDelete.contains(itemToDelete))

      m_model->m_itemsToDelete.push_back(itemToDelete);

  }

}

//------------------------------------------------------------------------------------------------------------------

QVariant TreeModel::Item::data(int role) const {

  if (role == Qt::DecorationRole)

    return createQIcon("folder", true);

  else

    return QVariant();

}

//------------------------------------------------------------------------------------------------------------------

QModelIndex TreeModel::Item::createIndex() {

  return m_parent ? m_model->createIndex(m_row, 0, this) : QModelIndex();

}

//====================================================================================================

// TreeModel

//----------------------------------------------------------------------------------------------------

TreeModel::TreeModel(TreeView *parent)

    : QAbstractItemModel(parent), m_rootItem(0), m_view(parent) {}

//------------------------------------------------------------------------------------------------------------------

TreeModel::~TreeModel() { delete m_rootItem; }

//------------------------------------------------------------------------------------------------------------------

void TreeModel::setExpandedItem(const QModelIndex &index, bool expanded) {

  if (m_view) m_view->setExpanded(index, expanded);

}

//------------------------------------------------------------------------------------------------------------------

void TreeModel::beginRefresh() { emit layoutAboutToBeChanged(); }

//------------------------------------------------------------------------------------------------------------------

void TreeModel::endRefresh() {

  QList<qmodelindex> oldIndices, newIndices;</qmodelindex>

  int i;

  QList<item *="">::iterator it;</item>

  // comment out as no subclass of TreeModel reimplement removeRows() for now

  // and it causes assertion failure on calling beginRemoveRows() when deleting

  // the last column in the xsheet

  /*

  for (i = m_itemsToDelete.size() - 1; i >= 0; i--) {

    int row          = m_itemsToDelete[i]->getRow();

    Item *parentItem = m_itemsToDelete[i]->getParent();

    QModelIndex parentIndex =

        parentItem ? parentItem->createIndex() : QModelIndex();

    beginRemoveRows(parentIndex, row, row);

    removeRows(row, 1, parentIndex);  // NOTE: This is currently doing NOTHING?

  (see

                                  // Qt's manual)

    endRemoveRows();

  }*/

  qDeleteAll(m_itemsToDelete);

  m_itemsToDelete.clear();

  if (!persistentIndexList().empty()) {

    for (i = 0; i < persistentIndexList().size(); i++) {

      QModelIndex oldIndex = persistentIndexList()[i];

      Item *item           = static_cast<item *="">(oldIndex.internalPointer());</item>

      if (item) {

        QModelIndex newIndex = item->createIndex();

        if (oldIndex != newIndex) {

          oldIndices.push_back(oldIndex);

          newIndices.push_back(newIndex);

        }

      }

    }

    changePersistentIndexList(oldIndices, newIndices);

  }

  emit layoutChanged();

}

//------------------------------------------------------------------------------------------------------------------

int TreeModel::columnCount(const QModelIndex &parent) const { return 1; }

//------------------------------------------------------------------------------------------------------------------

Qt::ItemFlags TreeModel::flags(const QModelIndex &index) const {

  if (!index.isValid()) return Qt::ItemFlags();

  return Qt::ItemIsEnabled | Qt::ItemIsSelectable;

}

//------------------------------------------------------------------------------------------------------------------

QModelIndex TreeModel::index(int row, int column,

                             const QModelIndex &parent) const {

  // column=!0 are not supported

  if (column != 0) return QModelIndex();

  Item *parentItem =

      parent.isValid() ? (Item *)(parent.internalPointer()) : m_rootItem;

  // if m_rootItem has not been defined yet. (It should not happen, but just in

  // case)

  if (!parentItem) return QModelIndex();

  int childCount = parentItem->getChildCount();

  if (row < 0 || row >= childCount) return QModelIndex();

  Item *item = parentItem->getChild(row);

  if (!item) return QModelIndex();  // it should never happen

  return item->createIndex();

}

//------------------------------------------------------------------------------------------------------------------

QModelIndex TreeModel::parent(const QModelIndex &index) const {

  if (!index.isValid()) return QModelIndex();

  Item *item = (Item *)index.internalPointer();

  TreeModel::Item *parentItem = item->getParent();

  if (!parentItem || parentItem == m_rootItem) return QModelIndex();

  return parentItem->createIndex();

}

//------------------------------------------------------------------------------------------------------------------

int TreeModel::rowCount(const QModelIndex &parent) const {

  if (parent.column() > 0) return 0;

  if (!parent.isValid())

    return m_rootItem ? m_rootItem->getChildCount() : 0;

  else

    return ((Item *)(parent.internalPointer()))->getChildCount();

}

//------------------------------------------------------------------------------------------------------------------

void TreeModel::onExpanded(const QModelIndex &index) {

  if (!index.isValid()) return;

  Item *item = (Item *)(index.internalPointer());

  item->setIsOpen(true);

}

//---------------------------------------------------------------------------------------------------------------

void TreeModel::onCollapsed(const QModelIndex &index) {

  if (!index.isValid()) return;

  Item *item = (Item *)(index.internalPointer());

  item->setIsOpen(false);

}

//---------------------------------------------------------------------------------------------------------------

QVariant TreeModel::data(const QModelIndex &index, int role) const {

  if (!index.isValid()) return QVariant();

  Item *item = static_cast<item *="">(index.internalPointer());</item>

  return item->data(role);

}

//---------------------------------------------------------------------------------------------------------------

void TreeModel::setRootItem(Item *rootItem) {

  if (rootItem == m_rootItem) return;

  delete m_rootItem;

  m_rootItem = rootItem;

  if (m_rootItem) m_rootItem->setModel(this);

}

// postpone freeing, so existing items can be referenced while refreshing.

void TreeModel::setRootItem_NoFree(Item *rootItem) {

  if (rootItem == m_rootItem) return;

  m_rootItem = rootItem;

  if (m_rootItem) m_rootItem->setModel(this);

}

//---------------------------------------------------------------------------------------------------------------

void TreeModel::setRowHidden(int row, const QModelIndex &parent, bool hide) {

  if (m_view) m_view->setRowHidden(row, parent, hide);

}

//====================================================================================================

// TreeView

//----------------------------------------------------------------------------------------------------

TreeView::TreeView(QWidget *parent) : QTreeView(parent), m_dragging(false) {

  header()->hide();

  setUniformRowHeights(true);

  setIconSize(QSize(32, 32));

}

//-----------------------------------------------------------------------------

//! Resizes viewport to contents

void TreeView::resizeToConts(void) { resizeColumnToContents(0); }

//-----------------------------------------------------------------------------

void TreeView::resizeEvent(QResizeEvent *event) {

  resizeColumnToContents(0);

  QTreeView::resizeEvent(event);

}

//----------------------------------------------------------------------------------------------------------------

void TreeView::setModel(TreeModel *model) {

  QTreeView::setModel(model);

  disconnect();

  connect(this, SIGNAL(expanded(const QModelIndex &)), model,

          SLOT(onExpanded(const QModelIndex &)));

  connect(this, SIGNAL(collapsed(const QModelIndex &)), model,

          SLOT(onCollapsed(const QModelIndex &)));

  // setItemDelegate(new Delegate(this));

  // Connect all possible changes that can alter the

  // bottom horizontal scrollbar to resize contents...

  connect(this, SIGNAL(expanded(const QModelIndex &)), this,

          SLOT(resizeToConts()));

  connect(this, SIGNAL(collapsed(const QModelIndex &)), this,

          SLOT(resizeToConts()));

  connect(this->model(), SIGNAL(layoutChanged()), this, SLOT(resizeToConts()));

}

//----------------------------------------------------------------------------------------------------------------

void TreeView::mouseDoubleClickEvent(QMouseEvent *) {

  // ignore double click!

}

void TreeView::mousePressEvent(QMouseEvent *e) {

  if (e->button() != Qt::RightButton) QTreeView::mousePressEvent(e);

  QModelIndex index = indexAt(e->pos());

  if (index.isValid()) {

    TreeModel::Item *item =

        static_cast<treemodel::item *="">(index.internalPointer());</treemodel::item>

    QRect itemRect = visualRect(index);

    QPoint itemPos = e->pos() - itemRect.topLeft();

    if (e->button() == Qt::RightButton) {

      if (selectionMode() != QAbstractItemView::ExtendedSelection)

        setCurrentIndex(item->createIndex());

      onClick(item, itemPos, e);

      openContextMenu(item, e->globalPos());

    } else if (e->button() == Qt::LeftButton) {

      m_dragging = true;

      setMouseTracking(true);

      onClick(item, itemPos, e);

    }

    // for drag & drop

    else if (e->button() == Qt::MiddleButton) {

      m_dragging = true;

      setMouseTracking(true);

      onMidClick(item, itemPos, e);

    }

  }

}

//----------------------------------------------------------------------------------------------------------------

void TreeView::mouseMoveEvent(QMouseEvent *e) {

  QTreeView::mouseMoveEvent(e);

  if (m_dragging) {

    QModelIndex index = indexAt(e->pos());

    if (index.isValid()) {

      TreeModel::Item *item =

          static_cast<treemodel::item *="">(index.internalPointer());</treemodel::item>

      QRect itemRect = visualRect(index);

      QPoint itemPos = e->pos() - itemRect.topLeft();

      onDrag(item, itemPos, e);

    }

  }

}

//----------------------------------------------------------------------------------------------------------------

void TreeView::mouseReleaseEvent(QMouseEvent *e) {

  QTreeView::mouseReleaseEvent(e);

  if (m_dragging) {

    m_dragging = false;

    setMouseTracking(false);

    onRelease();

  }

}

//----------------------------------------------------------------------------------------------------------------

/*

bool TreeView::Delegate::editorEvent(QEvent *e, QAbstractItemModel

*abstractModel, const QStyleOptionViewItem &option, const QModelIndex &index)

{

  if(e->type() != QEvent::MouseButtonPress) return false;

  TreeModel *model = dynamic_cast<treemodel *="">(abstractModel);</treemodel>

  if(!model || !index.isValid()) return false;

  TreeModel::Item *item = static_cast

*>(index.internalPointer());

  QMouseEvent* mouseEvent = dynamic_cast<qmouseevent*>(e);</qmouseevent*>

  QPoint pos = mouseEvent->pos();

  m_treeView->onClick(item, pos, option);

  return true;

}

*/