/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.jmeter.report.gui.action;

import java.awt.event.ActionEvent;
import java.util.HashSet;
import java.util.Set;

import org.apache.jmeter.control.Controller;
import org.apache.jmeter.gui.ReportGuiPackage;
import org.apache.jmeter.report.gui.action.AbstractAction;
import org.apache.jmeter.report.gui.tree.ReportTreeListener;
import org.apache.jmeter.report.gui.tree.ReportTreeNode;
import org.apache.jmeter.samplers.Sampler;
import org.apache.jmeter.testelement.TestElement;
import org.apache.jmeter.testelement.TestPlan;
import org.apache.jmeter.testelement.WorkBench;

public class ReportDragNDrop extends AbstractAction {
	public static final String ADD = "drag_n_drop.add";//$NON-NLS-1$

	public static final String INSERT_BEFORE = "drag_n_drop.insert_before";//$NON-NLS-1$

	public static final String INSERT_AFTER = "drag_n_drop.insert_after";//$NON-NLS-1$

	private static final Set commands = new HashSet();
	static {
		commands.add(ADD);
		commands.add(INSERT_BEFORE);
		commands.add(INSERT_AFTER);
	}

	/**
	 * @see org.apache.jmeter.gui.action.Command#doAction(ActionEvent)
	 */
	public void doAction(ActionEvent e) {
		String action = e.getActionCommand();
		ReportGuiPackage guiPackage = ReportGuiPackage.getInstance();
		ReportTreeNode[] draggedNodes = guiPackage.getTreeListener().getDraggedNodes();
		ReportTreeListener treeListener = guiPackage.getTreeListener();
		ReportTreeNode currentNode = treeListener.getCurrentNode();
		ReportTreeNode parentNode = (ReportTreeNode) currentNode.getParent();
		TestElement te = currentNode.getTestElement();
		if (te instanceof TestPlan || te instanceof WorkBench) {
			parentNode = null; // So elements can only be added as children
		}
		// System.out.println(action+" "+te.getClass().getName());

		if (ADD.equals(action) && canAddTo(currentNode)) {
			removeNodesFromParents(draggedNodes);
			for (int i = 0; i < draggedNodes.length; i++) {
				ReportGuiPackage.getInstance().getTreeModel().insertNodeInto(draggedNodes[i], currentNode,
						currentNode.getChildCount());
			}
		} else if (INSERT_BEFORE.equals(action) && canAddTo(parentNode)) {
			removeNodesFromParents(draggedNodes);
			for (int i = 0; i < draggedNodes.length; i++) {
				int index = parentNode.getIndex(currentNode);
				ReportGuiPackage.getInstance().getTreeModel().insertNodeInto(draggedNodes[i], parentNode, index);
			}
		} else if (INSERT_AFTER.equals(action) && canAddTo(parentNode)) {
			removeNodesFromParents(draggedNodes);
			for (int i = 0; i < draggedNodes.length; i++) {
				int index = parentNode.getIndex(currentNode) + 1;
				ReportGuiPackage.getInstance().getTreeModel().insertNodeInto(draggedNodes[i], parentNode, index);
			}
		}
		ReportGuiPackage.getInstance().getMainFrame().repaint();
	}

	/**
	 * Determine whether or not dragged nodes can be added to this parent. Also
	 * used by Paste TODO tighten rules TODO move to MenuFactory?
	 * 
	 * @param parentNode
	 * @return whether it is OK to add the dragged nodes to this parent
	 */
	static boolean canAddTo(ReportTreeNode parentNode) {
		if (null == parentNode) {
			return false;
		}
		TestElement te = parentNode.getTestElement();
		// System.out.println("Add to: "+te.getClass().getName());
		if (te instanceof Controller) {
			return true;
		}
		if (te instanceof Sampler) {
			return true;
		}
		if (te instanceof WorkBench) {
			return true;
		}
		if (te instanceof TestPlan) {
			return true;
		}
		return false;
	}

	protected void removeNodesFromParents(ReportTreeNode[] nodes) {
		for (int i = 0; i < nodes.length; i++) {
			ReportGuiPackage.getInstance().getTreeModel().removeNodeFromParent(nodes[i]);
		}
	}

	/**
	 * @see org.apache.jmeter.gui.action.Command#getActionNames()
	 */
	public Set getActionNames() {
		return commands;
	}
}
