/*
 * Copyright 2005-2010 the original author or authors.
 *
 * 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.springframework.ws.transport.mail.support;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.mail.Folder;
import javax.mail.MessagingException;
import javax.mail.Service;
import javax.mail.Store;
import javax.mail.Transport;
import javax.mail.URLName;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;

import org.springframework.util.StringUtils;
import org.springframework.ws.transport.mail.MailTransportConstants;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Collection of utility methods to work with Mail transports.
 *
 * @author Arjen Poutsma
 * @since 1.5.0
 */
public abstract class MailTransportUtils {

	private static final Pattern TO_PATTERN = Pattern.compile("^([^\\?]+)");

	private static final Pattern SUBJECT_PATTERN = Pattern.compile("subject=([^\\&]+)");

	private static final Log logger = LogFactory.getLog(MailTransportUtils.class);

	private MailTransportUtils() {
	}

	public static InternetAddress getTo(URI uri) {
		Matcher matcher = TO_PATTERN.matcher(uri.getSchemeSpecificPart());
		if (matcher.find()) {
			for (int i = 1; i <= matcher.groupCount(); i++) {
				String group = matcher.group(i);
				if (group != null) {
					try {
						return new InternetAddress(group);
					}
					catch (AddressException e) {
						// try next group
					}
				}
			}
		}
		return null;
	}

	public static String getSubject(URI uri) {
		Matcher matcher = SUBJECT_PATTERN.matcher(uri.getSchemeSpecificPart());
		if (matcher.find()) {
			return matcher.group(1);
		}
		return null;
	}

	/**
	 * Close the given JavaMail Service and ignore any thrown exception. This is useful for typical {@code finally}
	 * blocks in manual JavaMail code.
	 *
	 * @param service the JavaMail Service to close (may be {@code null})
	 * @see Transport
	 * @see Store
	 */
	public static void closeService(Service service) {
		if (service != null) {
			try {
				service.close();
			}
			catch (MessagingException ex) {
				logger.debug("Could not close JavaMail Service", ex);
			}
		}
	}

	/**
	 * Close the given JavaMail Folder and ignore any thrown exception. This is useful for typical {@code finally}
	 * blocks in manual JavaMail code.
	 *
	 * @param folder the JavaMail Folder to close (may be {@code null})
	 */

	public static void closeFolder(Folder folder) {
		closeFolder(folder, false);
	}

	/**
	 * Close the given JavaMail Folder and ignore any thrown exception. This is useful for typical {@code finally}
	 * blocks in manual JavaMail code.
	 *
	 * @param folder  the JavaMail Folder to close (may be {@code null})
	 * @param expunge whether all deleted messages should be expunged from the folder
	 */
	public static void closeFolder(Folder folder, boolean expunge) {
		if (folder != null && folder.isOpen()) {
			try {
				folder.close(expunge);
			}
			catch (MessagingException ex) {
				logger.debug("Could not close JavaMail Folder", ex);
			}
		}
	}

	/** Returns a string representation of the given {@link URLName}, where the password has been protected. */
	public static String toPasswordProtectedString(URLName name) {
		String protocol = name.getProtocol();
		String username = name.getUsername();
		String password = name.getPassword();
		String host = name.getHost();
		int port = name.getPort();
		String file = name.getFile();
		String ref = name.getRef();
		StringBuilder tempURL = new StringBuilder();
		if (protocol != null) {
			tempURL.append(protocol).append(':');
		}

		if (StringUtils.hasLength(username) || StringUtils.hasLength(host)) {
			tempURL.append("//");
			if (StringUtils.hasLength(username)) {
				tempURL.append(username);
				if (StringUtils.hasLength(password)) {
					tempURL.append(":*****");
				}
				tempURL.append("@");
			}
			if (StringUtils.hasLength(host)) {
				tempURL.append(host);
			}
			if (port != -1) {
				tempURL.append(':').append(Integer.toString(port));
			}
			if (StringUtils.hasLength(file)) {
				tempURL.append('/');
			}
		}
		if (StringUtils.hasLength(file)) {
			tempURL.append(file);
		}
		if (StringUtils.hasLength(ref)) {
			tempURL.append('#').append(ref);
		}
		return tempURL.toString();
	}

	/**
	 * Converts the given internet address into a {@code mailto} URI.
	 *
	 * @param to	  the To: address
	 * @param subject the subject, may be {@code null}
	 * @return a mailto URI
	 */
	public static URI toUri(InternetAddress to, String subject) throws URISyntaxException {
		if (StringUtils.hasLength(subject)) {
			return new URI(MailTransportConstants.MAIL_URI_SCHEME, to.getAddress() + "?subject=" + subject, null);
		}
		else {
			return new URI(MailTransportConstants.MAIL_URI_SCHEME, to.getAddress(), null);
		}
	}


}