/*******************************************************************************
 * Copyright (c) 2013, 2014 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.corext.dom;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.text.edits.TextEditGroup;

import org.eclipse.jdt.core.dom.AST;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.ArrayType;
import org.eclipse.jdt.core.dom.ChildListPropertyDescriptor;
import org.eclipse.jdt.core.dom.Dimension;
import org.eclipse.jdt.core.dom.Type;
import org.eclipse.jdt.core.dom.rewrite.ASTRewrite;
import org.eclipse.jdt.core.dom.rewrite.ListRewrite;

import org.eclipse.jdt.internal.corext.util.JDTUIHelperClasses;

/**
 * Rewrite helper for {@link Dimension} node lists and {@link ArrayType}s.
 * 
 * @see JDTUIHelperClasses
 * @since 3.10
 */
public class DimensionRewrite {

	/**
	 * Creates a {@link ASTRewrite#createCopyTarget(ASTNode) copy} of <code>type</code>
	 * and adds <code>extraDimensions</code> to it.
	 * 
	 * @param type the type to copy
	 * @param extraDimensions the dimensions to add
	 * @param rewrite the ASTRewrite with which to create new nodes
	 * @return the copy target with added dimensions
	 */
	public static Type copyTypeAndAddDimensions(Type type, List<Dimension> extraDimensions, ASTRewrite rewrite) {
		AST ast= rewrite.getAST();
		if (extraDimensions.isEmpty()) {
			return (Type) rewrite.createCopyTarget(type);
		}
		
		ArrayType result;
		if (type instanceof ArrayType) {
			ArrayType arrayType= (ArrayType) type;
			Type varElementType= (Type) rewrite.createCopyTarget(arrayType.getElementType());
			result= ast.newArrayType(varElementType, 0);
			result.dimensions().addAll(copyDimensions(extraDimensions, rewrite));
			result.dimensions().addAll(copyDimensions(arrayType.dimensions(), rewrite));
		} else {
			Type elementType= (Type) rewrite.createCopyTarget(type);
			result= ast.newArrayType(elementType, 0);
			result.dimensions().addAll(copyDimensions(extraDimensions, rewrite));
		}
		return result;
	}

	/**
	 * Returns {@link ASTRewrite#createCopyTarget(ASTNode) copies} of the given <code>dimensions</code>.
	 * 
	 * @param dimensions the dimensions to copy
	 * @param rewrite the ASTRewrite with which to create new nodes
	 * 
	 * @return list of copy targets
	 */
	public static List<Dimension> copyDimensions(List<Dimension> dimensions, ASTRewrite rewrite) {
		ArrayList<Dimension> result= new ArrayList<Dimension>();
		for (int i= 0; i < dimensions.size(); i++) {
			result.add((Dimension) rewrite.createCopyTarget(dimensions.get(i)));
		}
		return result;
	}

	/**
	 * Removes all children in <code>node</code>'s <code>childListProperty</code>.
	 * 
	 * @param node ASTNode
	 * @param childListProperty child list property
	 * @param rewrite rewrite that removes the nodes
	 * @param editGroup the edit group in which to collect the corresponding text edits, or null if ungrouped
	 */
	public static void removeAllChildren(ASTNode node, ChildListPropertyDescriptor childListProperty, ASTRewrite rewrite, TextEditGroup editGroup) {
		ListRewrite listRewrite= rewrite.getListRewrite(node, childListProperty);
		@SuppressWarnings("unchecked")
		List<? extends ASTNode> children= (List<? extends ASTNode>) node.getStructuralProperty(childListProperty);
		for (ASTNode child : children) {
			listRewrite.remove(child, editGroup);
		}
	}

}