/*******************************************************************************
 * Copyright (c) 2000, 2006 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.refactoring;

import org.eclipse.core.runtime.Assert;

import org.eclipse.jdt.core.dom.ITypeBinding;
import org.eclipse.jdt.core.dom.IVariableBinding;


public class ParameterInfo {
	
	public static final int INDEX_FOR_ADDED= -1;
	public static final String ELLIPSIS= "..."; //$NON-NLS-1$
	
	private final IVariableBinding fOldBinding;
	private final ITypeBinding fOldTypeBinding;
	private final String fOldName;
	private final String fOldTypeName;
	private final int fOldIndex;

	private String fNewTypeName;
	private ITypeBinding fNewTypeBinding;
	private String fDefaultValue;
	private String fNewName;
	private boolean fIsDeleted;
	
	public ParameterInfo(String type, String name, int index) {
		this(null, null, type, name, index);
	}

	public ParameterInfo(IVariableBinding binding, String type, String name, int index) {
		this(binding, null, type, name, index);
	}
	
	private ParameterInfo(IVariableBinding binding, ITypeBinding typeBinding, String type, String name, int index) {
		fOldBinding= binding;
		fOldTypeBinding= typeBinding;
		fNewTypeBinding= typeBinding;
		fOldTypeName= type;
		fNewTypeName= type;
		fOldName= name;
		fNewName= name;
		fOldIndex= index;
		fDefaultValue= ""; //$NON-NLS-1$
		fIsDeleted= false;
	}

	public static ParameterInfo createInfoForAddedParameter() {
		ParameterInfo info= new ParameterInfo("Object", "newParam", INDEX_FOR_ADDED); //$NON-NLS-1$ //$NON-NLS-2$
		info.setDefaultValue("null"); //$NON-NLS-1$
		return info;
	}
	
	public static ParameterInfo createInfoForAddedParameter(ITypeBinding typeBinding, String type, String name) {
		return new ParameterInfo(null, typeBinding, type, name, INDEX_FOR_ADDED);
	}
	
	public int getOldIndex() {
		return fOldIndex;
	}
	
	public boolean isDeleted(){
		return fIsDeleted;
	}
	
	public void markAsDeleted(){
		Assert.isTrue(! isAdded());//added param infos should be simply removed from the list
		fIsDeleted= true;
	}
	
	public boolean isAdded(){
		return fOldIndex == INDEX_FOR_ADDED;
	}
	
	public boolean isTypeNameChanged() {
		return !fOldTypeName.equals(fNewTypeName);
	}
	
	public boolean isRenamed() {
		return !fOldName.equals(fNewName);
	}
	
	public boolean isVarargChanged() {
		return isOldVarargs() != isNewVarargs();
	}
	
	public IVariableBinding getOldBinding() {
		return fOldBinding;
	}

	public String getOldTypeName() {
		return fOldTypeName;
	}
	
	public String getNewTypeName() {
		return fNewTypeName;
	}
	
	public void setNewTypeName(String type){
		Assert.isNotNull(type);
		fNewTypeName= type;
	}

	public ITypeBinding getNewTypeBinding() {
		return fNewTypeBinding;
	}
	
	public void setNewTypeBinding(ITypeBinding typeBinding){
		fNewTypeBinding= typeBinding;
	}

	public boolean isOldVarargs() {
		return isVarargs(fOldTypeName);
	}
	
	public boolean isNewVarargs() {
		return isVarargs(fNewTypeName);
	}
	
	public String getOldName() {
		return fOldName;
	}

	public String getNewName() {
		return fNewName;
	}
	
	public void setNewName(String newName) {
		Assert.isNotNull(newName);
		fNewName= newName;
	}

	public String getDefaultValue(){
		return fDefaultValue;
	}
	
	public void setDefaultValue(String value){
		Assert.isNotNull(value);
		fDefaultValue= value;
	}

	public String toString() {
		return fOldTypeName + " " + fOldName + " @" + fOldIndex + " -> " //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$
		+ fNewTypeName + " " + fNewName + ": " + fDefaultValue  //$NON-NLS-1$//$NON-NLS-2$
		+ (fIsDeleted ? " (deleted)" : " (stays)");  //$NON-NLS-1$//$NON-NLS-2$
	}
	
	public static String stripEllipsis(String typeName) {
		if (isVarargs(typeName))
			return typeName.substring(0, typeName.length() - 3);
		else
			return typeName;
	}
	
	public static boolean isVarargs(String typeName) {
		return typeName.endsWith("..."); //$NON-NLS-1$
	}

	public ITypeBinding getOldTypeBinding() {
		return fOldTypeBinding;
	}
}