/*
 * Copyright (c) 2015 Evolveum
 *
 * 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 com.evolveum.midpoint.prism.match;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.naming.InvalidNameException;
import javax.naming.ldap.LdapName;
import javax.xml.namespace.QName;

import org.apache.commons.lang.StringUtils;

import com.evolveum.midpoint.prism.PrismConstants;
import com.evolveum.midpoint.util.DOMUtil;
import com.evolveum.midpoint.util.exception.SchemaException;

/**
 * Matching rule for LDAP distinguished name (DN).
 * 
 * @author Radovan Semancik
 *
 */
public class DistinguishedNameMatchingRule implements MatchingRule<String> {
	
	public static final QName NAME = new QName(PrismConstants.NS_MATCHING_RULE, "distinguishedName");

	@Override
	public QName getName() {
		return NAME;
	}

	@Override
	public boolean isSupported(QName xsdType) {
		return (DOMUtil.XSD_STRING.equals(xsdType));
	}

	/* (non-Javadoc)
	 * @see com.evolveum.midpoint.model.match.MatchingRule#match(java.lang.Object, java.lang.Object)
	 */
	@Override
	public boolean match(String a, String b) throws SchemaException {
		if (StringUtils.isBlank(a) && StringUtils.isBlank(b)) {
			return true;
		}
		if (StringUtils.isBlank(a) || StringUtils.isBlank(b)) {
			return false;
		}
		LdapName dnA;
		try {
			dnA = new LdapName(a);
		} catch (InvalidNameException e) {
			throw new SchemaException("String '"+a+"' is not a DN: "+e.getMessage(), e);
		}
		LdapName dnB;
		try {
			dnB = new LdapName(b);
		} catch (InvalidNameException e) {
			throw new SchemaException("String '"+b+"' is not a DN: "+e.getMessage(), e);
		}
		return dnA.equals(dnB);
	}

	/* (non-Javadoc)
	 * @see com.evolveum.midpoint.prism.match.MatchingRule#normalize(java.lang.Object)
	 */
	@Override
	public String normalize(String original) throws SchemaException {
		if (StringUtils.isBlank(original)) {
			return null;
		}
		LdapName dn;
		try {
			dn = new LdapName(original);
		} catch (InvalidNameException e) {
			throw new SchemaException("String '"+original+"' is not a DN: "+e.getMessage(), e);
		}
		return StringUtils.lowerCase(dn.toString());
	}

	@Override
	public boolean matchRegex(String a, String regex) throws SchemaException {
		
		a = normalize(a);
		
		if (a == null){
			return false;
		}
		
		// Simple case-insensitive match		
		Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
		Matcher matcher = pattern.matcher(a);
		return matcher.matches();
	}

}