/**
 * A simple implementation of mail messages.  Intended to illustrate
 * a basic, but correct, solution for assignment 1 of CS152 99F.
 *
 * Right now, includes only one primary recipient and no carbon-copied
 * recipients.  Also ignores many common header fields.  All email
 * addresses should be of the form name@host.  Names should not include
 * quotation marks.  Of all the components you can set and get, only
 * dates can be null.
 *
 * May eventually be expanded to include that additional information.
 *
 * @author Samuel A. Rebelsky
 * @version 1.1 of September 1999
 */
public class SimpleMailMessage {
  // +--------+--------------------------------------------------
  // | Fields |
  // +--------+

  /** The name of the person who sent the message. */
  protected String senderName;
  /** The email address of the person who sent the message. */
  protected String senderEmail;
  /** The name of the intended recipient.  */
  protected String recipientName;
  /** The email address of that recipient. */
  protected String recipientEmail;
  /** The date the message was sent. */
  protected SimpleDate dateSent;
  /** The subject of the message. */
  protected String subject;
  /** The body of the message. */
  protected String body;

  // +--------------+--------------------------------------------
  // | Constructors |
  // +--------------+

  /**
   * Create a new message, specifying all of the components.
   * Of these components, only the date can be null.  For the
   * others, use the empty string ("") for "unspecified".
   * If the body is not empty, please use a carraige return at the
   * end of the body.
   */
  public SimpleMailMessage(
      String senderName,
      String senderEmail,
      String recipientName,
      String recipientEmail,
      SimpleDate dateSent,
      String subject,
      String body) {
    this.senderName = senderName;
    this.senderEmail = senderEmail;
    this.recipientName = recipientName;
    this.recipientEmail = recipientEmail;
    this.dateSent = dateSent;
    this.subject = subject;
    this.body = body;
  } // SimpleMailMessage(...)

  /**
   * Create a simple mail message, with no components.
   */
  public SimpleMailMessage() {
    this.senderName = "";
    this.senderEmail = "";
    this.recipientName = "";
    this.recipientEmail = "";
    this.dateSent = null;
    this.subject = "";
    this.body = "";
  } // SimpleMailMessage()

  // +-----------+-----------------------------------------------
  // | Accessors |
  // +-----------+

  /**
   * Get the body of the message.
   */
  public String getBody() {
    return this.body;
  } // getBody()

  /**
   * Get the date the message was sent. 
   */
  public SimpleDate getDate() {
    return this.dateSent;
  } // getDate()

  /**
   * Get the email address of the recipient of the message. 
   */
  public String getRecipientEmail() {
    return this.recipientEmail;
  } // getRecipientEmail()

  /**
   * Get the name of the recipient of the message. 
   */
  public String getRecipientName() {
    return this.recipientName;
  } // getRecipientName()

  /**
   * Get the email address of the sender of the message. 
   */
  public String getSenderEmail() {
    return this.senderEmail;
  } // getSenderEmail()

  /**
   * Get the name of the sender of the message. 
   */
  public String getSenderName() {
    return this.senderName;
  } // getSenderName()

  /**
   * Get the subject of the message.
   */
  public String getSubject() {
    return this.subject;
  } // getSubject()

  /**
   * Get a simple, printable, version of the message.
   */
  public String toString() {
    String message = "";
    // Add a from address, if it exists.
    if (!this.senderEmail.equals("") || !this.senderName.equals("")) {
      message = message + "From: ";
      if (!this.senderName.equals("")) {
        message = message + "\"" + this.senderName + "\" ";
      }
      if (!this.senderEmail.equals("")) {
        message = message + "<" + this.senderEmail + ">";
      }
      // Don't forget the carriage return
      message = message + "\n";
    } // if there is a from address
    // Add a to address, if it exists.
    if (!this.recipientEmail.equals("") || !this.recipientName.equals("")) {
      message = message + "To: ";
      if (!this.recipientName.equals("")) {
        message = message + "\"" + this.recipientName + "\" ";
      }
      if (!this.recipientEmail.equals("")) {
        message = message + "<" + this.recipientEmail + ">";
      }
      // Don't forget the carriage return
      message = message + "\n";
    } // if there is a to address
    // Add a subject, if it exists.
    if (!this.subject.equals("")) {
      message = message + "Subject: " + this.subject + "\n";
    }
    // Add a date, if it exsits.
    if (this.dateSent != null) {
      message = message + "Date: " + this.dateSent.toString() + "\n";
    }
    // Add a blank line if the header is nonempty.
    if (!message.equals("")) {
      message = message + "\n";
    }
    // Add the body.  The body should end with a carriage return.
    message = message + body;
    // That's it.  Return the result.
    return message;
  } // toString()

  // +-----------+-----------------------------------------------
  // | Modifiers |
  // +-----------+

  /**
   * Set the body.  Empty messages should have the empty string
   * ("") as their bodies.  Returns the old body.
   */
  public String setBody(String newBody) {
    String oldBody = this.body;
    this.body = newBody;
    return oldBody;
  } // setBody(String)
   
  /** 
   * Set the date.  Use null for unknown date.  Returns the old date.
   */
  public SimpleDate setDate(SimpleDate newDate) {
    SimpleDate oldDate = this.dateSent;
    this.dateSent = newDate;
    return oldDate;
  } // setDate(SimpleDate)

  /**
   * Set the recipient.  Requires both a name and an email address.
   * Neither should be null.
   */
  public void setRecipient(String newName, String newEmail) {
    this.recipientName = newName;
    this.recipientEmail = newEmail;
  } // setRecipeint(String,String)

  /**
   * Set the sender.  Requires both a name and an email address.
   * Neither should be null.
   */
  public void setSender(String newName, String newEmail) {
    this.senderName = newName;
    this.senderEmail = newEmail;
  } // setSender(String,String)

  /**
   * Set the subject.  An empty message should have the empty string
   * ("") as its subject.  Returns the old subject.
   */
  public String setSubject(String newSubject) {
    String oldSubject = this.subject;
    this.subject= newSubject;
    return oldSubject;
  } // setSubject(String)
   
  // +---------------+-------------------------------------------
  // | Miscellaneous |
  // +---------------+

  /**
   * Create the initial reply to this message.  The reply will
   * have inverted sender and recipient and a slightly updated
   * subject.  The body will be empty.  Note that the choice to
   * make the recipient the sender is not necessarily appropriate,
   * since the person making the reply may be someone on the
   * Cc or Bcc list.  However, it should suffice for now.
   */
  public SimpleMailMessage makeReply() {
    SimpleMailMessage reply = new SimpleMailMessage();
    reply.setSender(this.recipientName, this.recipientEmail);
    reply.setRecipient(this.senderName, this.senderEmail);
    reply.setSubject("Re: " + this.subject);
    return reply;
  } // makeReply()

} // class SimpleMailMessage