/*
Copyright 2011-2016 Google Inc. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package com.google.security.zynamics.zylib.yfileswrap.gui.zygraph;

import com.google.security.zynamics.zylib.gui.zygraph.IFineGrainedSloppyGraph2DView;
import com.google.security.zynamics.zylib.yfileswrap.gui.zygraph.realizers.ZyGroupNodeRealizer;

import y.base.Edge;
import y.base.Node;
import y.view.Graph2D;
import y.view.hierarchy.HierarchyManager;


public class ZyGraphLayeredRenderer<ViewType extends IFineGrainedSloppyGraph2DView> extends
    ZyGraphFineGrainedRenderer<ViewType> {
  private Node m_node = null;

  public ZyGraphLayeredRenderer(final ViewType inputView) {
    super(inputView);
    setLayeredPainting(true);
  }

  /**
   * Determines whether any of the parent nodes of the given node is selected.
   */
  private boolean isAnyParentNodeSelected(final Node n) {
    final Graph2D graph = (Graph2D) n.getGraph();
    final HierarchyManager hierarchy = graph.getHierarchyManager();

    if (hierarchy == null) {
      return false;
    }

    boolean result = false;
    Node parent = hierarchy.getParentNode(n);
    while (parent != null) {
      if (graph.isSelected(parent)) {
        result = true;
        break;
      }
      parent = hierarchy.getParentNode(parent);
    }
    return result;
  }

  @Override
  protected int getLayer(final Graph2D graph, final Edge edge) {
    return 2;
  }

  @Override
  protected int getLayer(final Graph2D graph, final Node node) {
    final boolean isGroupNode = graph.getRealizer(node) instanceof ZyGroupNodeRealizer<?>;
    if ((graph.isSelected(node) || isAnyParentNodeSelected(node)) && !isGroupNode) {
      return 3;
    } else if ((m_node == node) && !isGroupNode) {
      return 4;
    } else if (isGroupNode) {
      return 1;
    } else {
      return 2;
    }
  }

  public void bringNodeToFront(final Node node) {
    m_node = node;
  }
}
