/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.runtime.config.spring.parsers.processors;

import org.mule.runtime.config.spring.parsers.PreProcessor;
import org.mule.runtime.config.spring.parsers.assembly.configuration.PropertyConfiguration;
import org.mule.runtime.config.spring.util.SpringXMLUtils;
import org.mule.runtime.core.util.StringUtils;

import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;

/**
 * If this attribute is present, no other can be
 */
public class CheckExclusiveAttribute implements PreProcessor {

  public static final int NONE = -1;
  private String attribute;

  public CheckExclusiveAttribute(String attribute) {
    this.attribute = attribute;
  }

  public void preProcess(PropertyConfiguration config, Element element) {
    List foundAttributes = new LinkedList();
    boolean found = false;

    NamedNodeMap attributes = element.getAttributes();
    for (int i = 0; i < attributes.getLength(); i++) {
      Attr attribute = (Attr) attributes.item(i);
      String alias = SpringXMLUtils.attributeName(attribute);
      if (!config.isIgnored(alias)) {
        if (attribute.equals(alias)) {
          found = true;
        } else if (StringUtils.equals(element.getNamespaceURI(), attribute.getNamespaceURI())) {
          foundAttributes.add(alias);
        }
      }
    }

    if (found && foundAttributes.size() > 0) {
      StringBuilder message = new StringBuilder("The attribute '");
      message.append(attribute);
      message.append("' cannot appear with the attribute");
      if (foundAttributes.size() > 1) {
        message.append("s");
      }
      Iterator others = foundAttributes.iterator();
      while (others.hasNext()) {
        message.append(" '");
        message.append(others.next());
        message.append("'");
      }
      message.append(" in element ");
      message.append(SpringXMLUtils.elementToString(element));
      message.append(".");
      throw new CheckExclusiveAttributeException(message.toString());
    }
  }

  public static class CheckExclusiveAttributeException extends IllegalStateException {

    private CheckExclusiveAttributeException(String message) {
      super(message);
    }

  }

}