/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2020 Olive Team

  This program 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.

  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

***/

#include "graph.h"

#include <QChildEvent>

namespace olive {

#define super QObject

NodeGraph::NodeGraph()
{
}

NodeGraph::~NodeGraph()
{
  Clear();
}

void NodeGraph::Clear()
{
  // By deleting the last nodes first, we assume that nodes that are most important are deleted last
  // (e.g. Project's ColorManager or ProjectSettingsNode.
  while (!node_children_.isEmpty()) {
    delete node_children_.last();
  }
}

void NodeGraph::childEvent(QChildEvent *event)
{
  super::childEvent(event);

  Node* node = dynamic_cast<Node*>(event->child());

  if (node) {
    if (event->type() == QEvent::ChildAdded) {

      node_children_.append(node);

      // Connect signals
      connect(node, &Node::InputConnected, this, &NodeGraph::InputConnected);
      connect(node, &Node::InputDisconnected, this, &NodeGraph::InputDisconnected);
      connect(node, &Node::ValueChanged, this, &NodeGraph::ValueChanged);

      emit NodeAdded(node);
      emit node->AddedToGraph(this);

    } else if (event->type() == QEvent::ChildRemoved) {

      node_children_.removeOne(node);

      // Disconnect signals
      disconnect(node, &Node::InputConnected, this, &NodeGraph::InputConnected);
      disconnect(node, &Node::InputDisconnected, this, &NodeGraph::InputDisconnected);
      disconnect(node, &Node::ValueChanged, this, &NodeGraph::ValueChanged);

      emit NodeRemoved(node);
      emit node->RemovedFromGraph(this);

    }
  }
}

}