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package io.sirix.tutorial.xml;

import java.util.Objects;

import io.sirix.api.xml.XmlNodeReadOnlyTrx;
import io.sirix.diff.DiffDepth;
import io.sirix.diff.DiffFactory.DiffType;
import io.sirix.diff.DiffObserver;

public class MyXmlDiffObserver implements DiffObserver {

  private final XmlNodeReadOnlyTrx firstRtx;

  private final XmlNodeReadOnlyTrx secondRtx;

  MyXmlDiffObserver(final XmlNodeReadOnlyTrx newRtx, final XmlNodeReadOnlyTrx oldRtx) {
    this.firstRtx = Objects.requireNonNull(newRtx, "The first read only trx must not be null");
    this.secondRtx = Objects.requireNonNull(oldRtx, "The second read only trx must not be null");
  }

  @Override
  public void diffListener(DiffType diffType, long newNodeKey, long oldNodeKey, DiffDepth depth) {
    switch (diffType) {
      case INSERTED:
        System.out.println("DiffType: " + diffType);

        firstRtx.moveTo(newNodeKey);
        printNode(firstRtx);

        break;
      case DELETED:
        System.out.println("DiffType: " + diffType);

        secondRtx.moveTo(oldNodeKey);
        printNode(secondRtx);

        break;
      case UPDATED:
        System.out.println("DiffType: " + diffType);

        secondRtx.moveTo(oldNodeKey);
        System.out.print("Old: ");
        printNode(secondRtx);

        firstRtx.moveTo(newNodeKey);
        System.out.print("New: ");
        printNode(firstRtx);

        break;
      default:
    }
  }

  private void printNode(final XmlNodeReadOnlyTrx rtx) {
    switch (rtx.getKind()) {
      case ELEMENT, PROCESSING_INSTRUCTION, ATTRIBUTE, NAMESPACE -> System.out.println(rtx.getName());
      case TEXT, COMMENT -> System.out.println(rtx.getValue());
      default -> throw new IllegalStateException("Kind not known.");
    }
  }

  @Override
  public void diffDone() {
  }
}