/*******************************************************************************
 * Copyright (c) 2006 Sybase, Inc. and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Sybase, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.jst.pagedesigner.commands.range;

import java.util.Stack;
import java.util.Vector;

import org.eclipse.gef.GraphicalViewer;
import org.eclipse.jst.jsf.common.ui.internal.logging.Logger;
import org.eclipse.jst.jsf.core.internal.tld.IJSFConstants;
import org.eclipse.jst.pagedesigner.IHTMLConstants;
import org.eclipse.jst.pagedesigner.PDPlugin;
import org.eclipse.jst.pagedesigner.dom.DOMPosition;
import org.eclipse.jst.pagedesigner.dom.DOMPositionHelper;
import org.eclipse.jst.pagedesigner.dom.DOMRange;
import org.eclipse.jst.pagedesigner.dom.DOMRefPosition;
import org.eclipse.jst.pagedesigner.dom.EditHelper;
import org.eclipse.jst.pagedesigner.dom.EditModelQuery;
import org.eclipse.jst.pagedesigner.dom.IDOMPosition;
import org.eclipse.jst.pagedesigner.validation.caret.ActionData;
import org.eclipse.jst.pagedesigner.validation.caret.IETablePositionRule;
import org.eclipse.jst.pagedesigner.validation.caret.InlineEditingNavigationMediator;
import org.eclipse.jst.pagedesigner.viewer.LayoutPart;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;

/**
 * @author mengbo
 */
public class DeleteEdit extends DesignEdit {
	private static final Logger _log = PDPlugin.getLogger(DeleteEdit.class);

	private static final boolean INNER_DEBUG = false;

	private boolean _forward;

	Vector deleted = new Vector();

	/**
	 * @param range
	 * @param viewer
	 * @param forward 
	 */
	public DeleteEdit(DOMRange range, GraphicalViewer viewer, boolean forward) {
		super(range, viewer);
		_forward = forward;
	}

	/**
	 * @param range
	 * @param viewer
	 */
	public DeleteEdit(DOMRange range, GraphicalViewer viewer) {
		super(range, viewer);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jst.pagedesigner.commands.range.DesignEdit#operate()
	 */
	protected boolean operate() {
		try {
			boolean result = true;
			if (EditModelQuery.isSame(getRange())) {
				deleteSingle();
			} else {
				deleteRange();
			}
			return result;
		} catch (Exception e) {
			_log.error("Exception", e); //$NON-NLS-1$
			return false;
		}
	}

	/**
	 * Delete one node or char at operation position.
	 */
	private void deleteSingle() {
		IDOMPosition opPosition = getOperationPosition();
		opPosition = EditHelper.moveToNextEditPosition(getOperationPosition(),
				_forward, new InlineEditingNavigationMediator(new ActionData(
						ActionData.INLINE_EDIT, null)));
		// for inner debug
		if (INNER_DEBUG) {
			_log.info("EditHelper, now we are at:" + opPosition); //$NON-NLS-1$
		}
		if (EditModelQuery.isSame(opPosition, getOperationPosition())) {
			return;
		}
        setRange(new DOMRange(opPosition, getOperationPosition()));
        deleteRange();
	}

	/**
	 * @return the stack
	 */
	protected Stack deleteRange() {
		WorkNode root = getRootWorkNode();
		Node rootNode = root.getNode();
		Stack result = getProcessedResult();
		collectOtherStyles(rootNode, result);
		return result;
	}

	private boolean isTableComponents(WorkNode node) {
		String name = node.getNode().getNodeName();
		return (IHTMLConstants.TAG_TD.equalsIgnoreCase(name) || //
				IHTMLConstants.TAG_TH.equalsIgnoreCase(name) || //
				IHTMLConstants.TAG_TR.equalsIgnoreCase(name) || // 
				IHTMLConstants.TAG_THEAD.equalsIgnoreCase(name) || //
				IHTMLConstants.TAG_TBODY.equalsIgnoreCase(name) || //
		IHTMLConstants.TAG_TFOOT.equalsIgnoreCase(name));
	}

	private Node processContainerTable(WorkNode node) {
		Node result = null;
		if ((isTableComponents(node) || IHTMLConstants.TAG_TABLE
				.equalsIgnoreCase(node.getNode().getNodeName())) //
				&& new IETablePositionRule(null).isInValidTable(node
						.getNode())) {
			result = node.getNode().cloneNode(false);
		}
		return result;
	}

	private Node processContainerStyleNodes(WorkNode node) {
		String name = node.getNode().getNodeName();
		Node result = null;
		if (IHTMLConstants.TAG_LI.equalsIgnoreCase(name) || // 
				EditModelQuery.HTML_STYLE_NODES.contains(node.getNode()
						.getLocalName())) {
			if (node.getNode().hasChildNodes()) {
				result = node.getNode().cloneNode(false);
			}
		}
		return result;
	}

	private Node processContainerView(WorkNode node) {
		Node result = null;
		if (IJSFConstants.TAG_VIEW.equalsIgnoreCase(node.getNode()
				.getLocalName())) {
			result = EditModelQuery.getDocumentNode(node.getNode())
					.createElement(IJSFConstants.TAG_SUBVIEW);
			result.setPrefix(node.getNode().getPrefix());
		} else if (IHTMLConstants.TAG_BODY.equalsIgnoreCase(node.getNode()
				.getNodeName())
				|| IHTMLConstants.TAG_HTML.equalsIgnoreCase(node.getNode()
						.getNodeName())) {
			result = EditModelQuery.getDocumentNode(node.getNode())
					.createElement(node.getNode().getNodeName());
		}
		return result;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jst.pagedesigner.commands.range.AbstractCopyEdit#processContainer(org.eclipse.jst.pagedesigner.commands.range.WorkNode)
	 */
	protected Node processContainer(WorkNode node) {
		Node result = processContainerView(node);
		if (result == null) {
			result = processContainerTable(node);
		}
		if (result == null) {
			result = processContainerStyleNodes(node);
		}
		if (result == null) {
			// strip out container
			if (LayoutPart.getConcreteNode(node.getNode()) != null) {
				Node parent = node.getNode().getParentNode();
				Node refNode = node.getNode();
				Node child = node.getNode().getFirstChild();
				Node first = null, last = null;
				int index = 0;
				NodeList children = node.getNode().getChildNodes();
				int size = children.getLength();
				while (child != null) {
					Node next = child.getNextSibling();
					Node n = EditHelper.deleteNode(child);
					parent.insertBefore(n, refNode);
					if (index == 0) {
						if (refNode != null) {
							first = refNode.getPreviousSibling();
						} else {
							first = parent.getLastChild();
						}
					}
					if (index == size - 1) {
						if (refNode != null) {
							last = refNode.getPreviousSibling();
						} else {
							last = parent.getLastChild();
						}
					}
					index++;
					child = next;
				}
				if (node.getPosOffsets()[0] <= 0) {
					setOperationPosition(new DOMRefPosition(first, false));
				} else {
					setOperationPosition(new DOMRefPosition(last, true));
				}
			} else {
				setOperationPosition(new DOMRefPosition(node.getNode(), false));
			}
			result = EditHelper.deleteNode(node.getNode());
		}
		return result;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jst.pagedesigner.commands.range.AbstractCopyEdit#processNode(org.w3c.dom.Node,
	 *      int[])
	 */
	protected Node processNode(WorkNode node) {
		Node result = null;
		if (!isTableComponents(node)
				|| !new IETablePositionRule(null).isInValidTable(node
						.getNode())) {
			// it's not table components.
			setOperationPosition(new DOMRefPosition(node.getNode(), false));
			result = EditHelper.deleteNode(node.getNode());
		}
		return result;

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jst.pagedesigner.commands.range.AbstractCopyEdit#processText(org.w3c.dom.Text,
	 *      int[])
	 */
	protected Text processText(WorkNode node) {
		Text currentNode = (Text) node.getNode();
		int[] offsets = node.getPosOffsets();
		Node second = null;
		int location1 = EditHelper.getInstance().getLocation(currentNode,
				node.getPosOffsets()[0], true);
		int location2 = EditHelper.getInstance().getLocation(currentNode,
				node.getPosOffsets()[1], true);
		// left index
		if (currentNode.getData().length() > 0) {
			if (location1 == EditHelper.IN_MIDDLE) {
				IDOMPosition position = new DOMPosition(currentNode, node
						.getPosOffsets()[0]);
				setOperationPosition(position);
				position = DOMPositionHelper.splitText(position);
				Node nnode = position.getNextSiblingNode();
				if (nnode instanceof Text) {
					currentNode = (Text) nnode;
					offsets[1] -= offsets[0] > 0 ? offsets[0] : 0;
				}
			} else {
				// setOperationPosition(new DOMRefPosition(currentNode, false));
				if (currentNode.getPreviousSibling() != null) {
					setOperationPosition(new DOMRefPosition(currentNode
							.getPreviousSibling(), true));
				} else {
					setOperationPosition(new DOMPosition(currentNode
							.getParentNode(), 0));
				}
			}
			// right index
			if (location2 >= EditHelper.IN_MIDDLE) {
				IDOMPosition position = new DOMPosition(currentNode, offsets[1]);
				position = DOMPositionHelper.splitText(position);
				second = position.getPreviousSiblingNode();
			}
			return second != null ? (Text) EditHelper.deleteNode(second) : null;
		}
        setOperationPosition(new DOMRefPosition(currentNode, false));
        return (Text) EditHelper.deleteNode(currentNode);
	}
}