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/**
 * Licensed 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.
 *
 * Copyright 2012-2016 the original author or authors.
 */
package com.fitbur.assertj.util.diff;

import java.util.List;

/**
 * Initially copied from https://code.google.com/p/java-diff-utils/.
 * 
 * Describes the change-delta between original and revised texts.
 * 
 * @author Dmitry Naumenko
 * @param  The type of the compared elements in the 'lines'.
 */
public class ChangeDelta extends Delta {

  /**
   * Creates a change delta with the two given chunks.
   * @param original The original chunk. Must not be {@code null}.
   * @param revised The original chunk. Must not be {@code null}.
   */
  public ChangeDelta(Chunk original, Chunk revised) {
    super(original, revised);
  }

  /**
   * {@inheritDoc}
   * 
   * @throws IllegalStateException
   */
  @Override
  public void applyTo(List target) throws IllegalStateException {
    verify(target);
    int position = getOriginal().getPosition();
    int size = getOriginal().size();
    for (int i = 0; i < size; i++) {
      target.remove(position);
    }
    int i = 0;
    for (T line : getRevised().getLines()) {
      target.add(position + i, line);
      i++;
    }
  }

  /**
   * {@inheritDoc}
   */
  public void verify(List target) throws IllegalStateException {
    getOriginal().verify(target);
    if (getOriginal().getPosition() > target.size()) {
      throw new IllegalStateException("Incorrect patch for delta: delta original position > target size");
    }
  }

  @Override
  public String toString() {
    return String.format("Changed content at line %s:%nexpecting:%n  %s%nbut was:%n  %s%n",
                         lineNumber(), formatLines(getOriginal().getLines()), formatLines(getRevised().getLines()));
  }

  @Override
  public TYPE getType() {
    return Delta.TYPE.CHANGE;
  }
}