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/*
 * SonarQube XML Plugin
 * Copyright (C) 2010 SonarSource
 * [email protected]
 *
 * 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.
 */
package org.sonar.plugins.xml.checks;

import org.apache.commons.lang.StringUtils;
import org.sonar.check.BelongsToProfile;
import org.sonar.check.Priority;
import org.sonar.check.Rule;
import org.sonar.check.RuleProperty;
import org.w3c.dom.Document;
import org.w3c.dom.Node;

/**
 * Perform check for tab.
 *
 * @author Matthijs Galesloot
 */
@Rule(key = "IllegalTabCheck",
  priority = Priority.MINOR)
@BelongsToProfile(title = CheckRepository.SONAR_WAY_PROFILE_NAME, priority = Priority.MINOR)
public class IllegalTabCheck extends AbstractXmlCheck {

  @RuleProperty(key = "markAll", defaultValue = "false")
  private boolean markAll;

  private boolean validationReady;

  /**
   * Find Illegal tabs in whitespace.
   */
  private void findIllegalTabs(Node node) {

    // check whitespace in the node
    for (Node sibling = node.getPreviousSibling(); sibling != null; sibling = sibling.getPreviousSibling()) {
      if (sibling.getNodeType() == Node.TEXT_NODE) {
        String text = sibling.getTextContent();
        if (StringUtils.isWhitespace(text) && StringUtils.contains(text, "\t")) {
          createNewViolation(getWebSourceCode().getLineForNode(sibling));
          // one violation for this node is enough
          break;
        }
      }
    }

    // check the child elements of the node
    for (Node child = node.getFirstChild(); !validationReady && child != null; child = child.getNextSibling()) {
      if (child.getNodeType() == Node.ELEMENT_NODE) {
        findIllegalTabs(child);
      }
    }
  }

  private void createNewViolation(int lineNumber) {
    if (!markAll) {
      createViolation(lineNumber, "Tab characters found (this is the first occurrence)");
      validationReady = true;
    } else {
      createViolation(lineNumber);
    }
  }

  @Override
  public void validate(XmlSourceCode xmlSourceCode) {
    setWebSourceCode(xmlSourceCode);

    validationReady = false;
    Document document = getWebSourceCode().getDocument(false);
    if (document.getDocumentElement() != null) {
      findIllegalTabs(document.getDocumentElement());
    }
  }

  public boolean isMarkAll() {
    return markAll;
  }

  public void setMarkAll(boolean markAll) {
    this.markAll = markAll;
  }
}