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/*
 * Copyright (C) 2005-2017 ManyDesigns srl.  All rights reserved.
 * http://www.manydesigns.com/
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package com.manydesigns.mail.pop3;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.mail.BodyPart;
import javax.mail.Multipart;
import javax.mail.Part;
import java.util.HashSet;
import java.util.Properties;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/*
* @author Paolo Predonzani     - [email protected]
* @author Angelo Lupo          - [email protected]
* @author Giampiero Granatella - [email protected]
* @author Alessio Stalla       - [email protected]
*/
public abstract class POP3Client {
    protected static final String DELIVERY_STATUS_NOTIFICATION =
            "delivery status notification";
    public static final String copyright =
            "Copyright (C) 2005-2017 ManyDesigns srl";
    protected final String host;
    protected final String protocol;
    protected final int port;
    protected final String username;
    protected final String password;
    protected final Properties pop3Props;
      public static final Logger logger =
              LoggerFactory.getLogger(POP3Client.class);

    protected Set emails;

    public String getHost() {
        return host;
    }

    public String getProtocol() {
        return protocol;
    }

    public int getPort() {
        return port;
    }

    public String getUsername() {
        return username;
    }

    public String getPassword() {
        return password;
    }

    public Properties getPop3Props() {
        return pop3Props;
    }

    public POP3Client(String host, String protocol, int port, String username,
                      String password) {
        this.host = host;
        this.protocol = protocol;
        this.port = port;
        this.username = username;
        this.password = password;
        pop3Props = new Properties();
        pop3Props.setProperty("mail.pop3.port", "" + port);
        String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
        pop3Props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);
        pop3Props.setProperty("mail.pop3.socketFactory.fallback", "false");
        pop3Props.setProperty("mail.pop3.socketFactory.port", "" + port);
        this.emails = new HashSet();
    }

    protected Set extractEmail(Part p) throws Exception {

        Pattern pattern = Pattern.compile
                ("^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,4}$");
        String ct = "";
        if (p.isMimeType("multipart/*")) {
            Multipart mp = (Multipart) p.getContent();

            for (int x = 0; x < mp.getCount(); x++) {
                BodyPart bodyPart = mp.getBodyPart(x);

                String disposition = bodyPart.getDisposition();

                if (disposition != null && (disposition.equals
                        (BodyPart.ATTACHMENT))) {
                    //attachment do nothing
                } else {
                    if (bodyPart.getContent() instanceof String)
                        ct = ct + " " + bodyPart.getContent();
                }
            }
        } else {
            ct = ct + p.getContent();
        }
        StringTokenizer st = new StringTokenizer(ct, "\n,; ");
        while (st.hasMoreTokens()) {
            String line = st.nextToken();
            Matcher m = pattern.matcher(line);

            if (m.find()) {
                String email = line.substring(m.start(), m.end());

                if (!email.contains(getUsername()))
                    emails.add(email);
            }

        }
        return emails;
    }

    public Set getEmails() {
        return emails;
    }

    abstract Set read();
}