/*
 * [EmailAddress.java]
 *
 * Summary: Allows you to take email adresses apart into their component parts.
 *
 * Copyright: (c) 2002-2017 Roedy Green, Canadian Mind Products, http://mindprod.com
 *
 * Licence: This software may be copied and used freely for any purpose but military.
 *          http://mindprod.com/contact/nonmil.html
 *
 * Requires: JDK 1.8+
 *
 * Created with: JetBrains IntelliJ IDEA IDE http://www.jetbrains.com/idea/
 *
 * Version History:
 *  1.7 2007-08-21
 */
package com.mindprod.bulk;

import javax.mail.internet.InternetAddress;
import java.io.UnsupportedEncodingException;

import static java.lang.System.*;

/**
 * Allows you to take email adresses apart into their component parts.
 * <p/>
 * This class does not validate the format of the address.
 * For that see the EmailSyntaxValidator class.
 * Not currently used for anything.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.7 2007-08-21
 * @since 2002
 */
public final class EmailAddress
    {
    /**
     * the computer email address e.g. g.brown@oberon.ark.com, always lower case.
     */
    private final String email;

    /**
     * The human name e.g. "Roedy Green"
     */
    private final String personal;

    /**
     * public constructor
     *
     * @param email    complete computer email address, e.g. g.brown@oberon.ark.com
     * @param personal human name, e.g. "Mr. George & Mrs. Mary Brown" Strange characters allowed.  They will eventuall
     *                 be dealt with.
     */
    @SuppressWarnings( { "SameParameterValue" } )
    private EmailAddress( String email, String personal )
        {
        this.email = email.trim().toLowerCase();
        this.personal = personal.trim();
        }

    /**
     * Return fancy email address that combines computer and personal name e.g. ""Mr. George & Mrs. Mary Brown"
     * <g.brown@oberon.ark.com>
     *
     * @return combined email address, null if address can't be combined.
     */
    private String getCombinedAddress()
        {
        try
            {
            return new InternetAddress( email, personal ).toUnicodeString();
            }
        catch ( UnsupportedEncodingException e )
            {
            return null;
            }
        }

    /**
     * the domain part of the email address.
     *
     * @return Everything after the @, e.g. oberon.ark.com possibly null for a malformed address.
     */
    private String getDomain()
        {
        int lastAt = email.lastIndexOf( '@' );
        if ( lastAt < 0 )
            {
            return null;
            }
        return email.substring( lastAt + 1 );
        }

    /**
     * Get the computer email address: e.g. g.brown@oberon.ark.com
     *
     * @return return the complete computer address. without the attached human name.
     */
    private String getEmail()
        {
        return email;
        }

    /**
     * Get the name part of the email address.
     *
     * @return everything before the @ e.g. g.brown. possibly null for a malformed address.
     */
    private String getName()
        {
        int atplace = email.indexOf( '@' );
        if ( atplace < 0 )
            {
            return null;
            }
        return email.substring( 0, atplace );
        }

    /**
     * Get the human name, e.g. "Mr. George & Mrs. Mary Brown"
     *
     * @return Returns the human name.
     */
    private String getPersonal()
        {
        return personal;
        }

    /**
     * Get the Top Level Domain e.g. com net edu
     *
     * @return last part of the domain name, without the dot. possibly null for a malformed address.
     */
    private String getTLD()
        {
        int lastDot = email.lastIndexOf( '.' );
        if ( lastDot < 0 )
            {
            return null;
            }
        return email.substring( lastDot + 1 );
        }

    /**
     * Test driver
     *
     * @param args not used
     */
    public static void main( String[] args )
        {
        EmailAddress e =
                new EmailAddress( "g.brown@oberon.ark.com",
                        "Mr. George & Mrs. Mary Brown" );
        out.println( e.getEmail() );
        out.println( e.getName() );
        out.println( e.getDomain() );
        out.println( e.getTLD() );
        out.println( e.getPersonal() );
        out.println( e.getCombinedAddress() );
        }
    }