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/*******************************************************************************
 * Copyright (c) 2000, 2008 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 org.eclipse.core.runtime.Assert;

import org.eclipse.text.edits.TextEditGroup;

import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.ChildListPropertyDescriptor;
import org.eclipse.jdt.core.dom.StructuralPropertyDescriptor;
import org.eclipse.jdt.core.dom.rewrite.ASTRewrite;
import org.eclipse.jdt.core.dom.rewrite.ListRewrite;



public class ReplaceRewrite {

  protected ASTRewrite fRewrite;
  protected ASTNode[] fToReplace;
  protected StructuralPropertyDescriptor fDescriptor;

  public static ReplaceRewrite create(ASTRewrite rewrite, ASTNode[] nodes) {
    return new ReplaceRewrite(rewrite, nodes);
  }

  protected ReplaceRewrite(ASTRewrite rewrite, ASTNode[] nodes) {
    Assert.isNotNull(rewrite);
    Assert.isNotNull(nodes);
    Assert.isTrue(nodes.length > 0);
    fRewrite= rewrite;
    fToReplace= nodes;
    fDescriptor= fToReplace[0].getLocationInParent();
    if (nodes.length > 1) {
      Assert.isTrue(fDescriptor instanceof ChildListPropertyDescriptor);
    }
  }

  public void replace(ASTNode[] replacements, TextEditGroup description) {
    if (fToReplace.length == 1) {
      if (replacements.length == 1) {
        handleOneOne(replacements, description);
      } else {
        handleOneMany(replacements, description);
      }
    } else {
      handleManyMany(replacements, description);
    }
  }

  protected void handleOneOne(ASTNode[] replacements, TextEditGroup description) {
    fRewrite.replace(fToReplace[0], replacements[0], description);
  }

  protected void handleOneMany(ASTNode[] replacements, TextEditGroup description) {
    handleManyMany(replacements, description);
  }

  protected void handleManyMany(ASTNode[] replacements, TextEditGroup description) {
    ListRewrite container= fRewrite.getListRewrite(fToReplace[0].getParent(), (ChildListPropertyDescriptor)fDescriptor);
    if (fToReplace.length == replacements.length) {
      for (int i= 0; i < fToReplace.length; i++) {
        container.replace(fToReplace[i], replacements[i], description);
      }
    } else if (fToReplace.length < replacements.length) {
      for (int i= 0; i < fToReplace.length; i++) {
        container.replace(fToReplace[i], replacements[i], description);
      }
      for (int i= fToReplace.length; i < replacements.length; i++) {
        container.insertAfter(replacements[i], replacements[i - 1], description);
      }
    } else if (fToReplace.length > replacements.length) {
      int delta= fToReplace.length - replacements.length;
      for(int i= 0; i < delta; i++) {
        container.remove(fToReplace[i], description);
      }
      for (int i= delta, r= 0; i < fToReplace.length; i++, r++) {
        container.replace(fToReplace[i], replacements[r], description);
      }
    }
  }
}
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