/**
 *  <PRE>
 *  PostOffice.java
 *
 *  Revisions: 1.0 Oct. 11, 2002
 *               Created the PostOffice class
 *			   1.1 Oct. 11, 2002
 *				 Compiled, Finished, Commented
 *			   2.0 Oct. 16, 2002
 *				 Added Phase6 methods
 *
 *  </PRE>
 *
 *	Collaboration Statement:
 *    I worked on the homework assignment alone, using only             
 *    course materials.
 *  
 *  Created with JCreatorLE, some indents are off when viewed through notepad
 *    or EMACS
 *
 *  @author <A HREF="mailto:gtg184g@mail.gatech.edu">Jose Manuel Caban</A>
 *  @version Version 2.0, Oct. 16, 2002
 */

import java.util.*;

public class PostOffice implements P3Type{
  
  public static final boolean bDebug = false; //nothing to debug via var tho
  
  HashTable htExpress = new HashTable(10);

  
  ///////////
  //Methods//
  ///////////
  
  /**
   *Issue a mailbox with key as last name
   *@param mbToAdd, the mailbox to be added
   */
  public void issue(MailBox mbToAdd){
  	
  	if(htExpress.get(mbToAdd.getStrLName()) == null){ //avoid duplicate
  		htExpress.add(mbToAdd.getStrLName(),mbToAdd);
  	}
  }
  
  /**
   *Return the mail in a given persons box
   *@param strLName, the last name of the person
   */
  public String retrieve(String strLName){
  	
  	if(htExpress.get(strLName) == null){
  		return P3Type.NO_MAILBOX;
  	}
  	
  	MailBox mb = (MailBox)htExpress.get(strLName);
  	Enumeration e = mb.getMail();
  	String strLong = "";
  	int count = 1; //for flair
  	
  	while(e.hasMoreElements()){
  		strLong += "\nMessage " + count + ":\n" + 
  					e.nextElement().toString() + "\n";
  		count++;
  	}
  	return strLong;
  }
  
  /**
   *Send mail
   *@param toSend, the message to be sent
   */
  public int send(Mail toSend){
  	String strFromLName = "";
  	String strToLName = "";
  	  	
  	StringTokenizer st;
  	
  	//verify sender
  	st = new StringTokenizer(toSend.getStrFrom());
  	
  	while(st.hasMoreTokens()){
  		strFromLName = st.nextToken();
  	}
  	
  	if(htExpress.get(strFromLName) == null){
  		return P3Type.BAD_SENDER;
  	}
  	
  	//verify recipient  	
  	st = new StringTokenizer(toSend.getStrTo());
  	
  	while(st.hasMoreTokens()){
  		strToLName = st.nextToken();
  	}
  	
  	if(htExpress.get(strToLName) == null){
  		return P3Type.NO_RECIPIENT;
  	}
  	
  	//add the mail
  	MailBox mb = (MailBox)htExpress.get(strToLName);
  	mb.addMail(toSend);
  	
  	return P3Type.MAIL_SENT;  	
  }//end send(Mail)
  
  /**
   *@param strLName, to be removed from PostOffice
   *@return the number of unread messages in the box
   */
  public int remove(String strLName){
  	
  	if(htExpress.get(strLName) == null){
  		return P3Type.NO_MAILBOX_NUM;
  	}
  	
  	int count = 0;
  	MailBox mTemp = (MailBox)htExpress.remove(strLName);
  	Enumeration e = mTemp.getMail();
  	
  	//only because it looks cooler AND takes less typing
  	for(;e.hasMoreElements();count++,e.nextElement());
  	
  	return count;
  }//end remove(String)
  
  /**
   *@return enumeration containing the mailboxes
   */
  public Enumeration allBoxes(){
  	//this is a tough one
  	//took 4 of the 5 hours of p3phase5
  	return htExpress.elements();
  }
  
  /**
   *Resize the HashTable
   *Doubles current size
   */
  public void resize(){
  	htExpress.rehash(htExpress.size() * 2);
  }
  
  /*	   */
  /*Phase 6*/
  /*	   */
  
  /**
   *Write mailboxes to file and close program
   */
  public void leavingForTheDay(){
  	FileChanger fc = new FileChanger(P3Type.POST_OFFICE);
  	fc.initWriter();
  	
  	Enumeration e = htExpress.elements();
  	while(e.hasMoreElements()){
  		fc.writeObject(e.nextElement());
  	}
  	fc.closeWrite();
  }
  
  /**********************************************************/
  
  /**
   *  Debugging main for class PostOffice.  
   *  This method will rigorously test my code.
   *
   *  <br><br>
   *  @param args a String array of command line arguments.
   */
  public static void main(String[] args) {
    
    //System.testclass.for.me
    //If Java is so smart, why doesn't it have that!
    //by the way, how's that commenting style I just thought of /*stuff*/
    
    
    /*Begin Test Class*/
    PostOffice po = new PostOffice();
    
    //create test dummie...er...beta testers    
    
    //game gods
    po.issue(new MailBox("Romero","John"));  //hmm, two John's maybe
    po.issue(new MailBox("Carmack","John")); //I need a name change?
    po.issue(new MailBox("Sweeney","Tim"));
    po.issue(new MailBox("Miyamato","Shigeru"));
    
    //musical greatness
    po.issue(new MailBox("Beethoven","Ludwik von"));//hehe test StringToken too
    po.issue(new MailBox("Stravinsky","Igor"));
    po.issue(new MailBox("Reznor","Trent"));
    po.issue(new MailBox("Bowie","David"));
    
    //good anime characters
    po.issue(new MailBox("Starwind","Gene"));
    po.issue(new MailBox("Spiegel","Spike"));
    
    //assorted
    po.issue(new MailBox("McGee","Mike"));  //that's Mike McGee of the IN
    po.issue(new MailBox("Dole","Bob"));	//viva la Pfiezer!	
    
    	/*Test Exception*/
    	po.issue(new MailBox("Romero","John"));
    
    /*Test Retrieve*/
    po.send(new Mail("You're career has hit rock bottom","Carmack","Romero"));
    po.send(new Mail("I mean games for the PalmPC!?","Sweeney","Romero"));
    
    	/*Test Exception*/
    	if(po.send(new Mail("BOOOOOO","Bob","Romero")) == -1){
    		System.out.println("BAD_SENDER");
    	}
    	//despite not receiving the mail, a response!
    	if(po.send(new Mail("FU!","Romero","Bob")) == -2){
    		System.out.println("BAD_RECIPIENT");
    	}
    	
    System.out.println(po.retrieve("Romero"));
    
    /*Test Remove*/
    	/*Test Exception*/
    	System.out.println(po.remove("Romreo")); //oops :)
    	
    System.out.println(po.remove("Romero"));
    
    /*Nothing to test for resize() and allBoxes(), tested in HashTable*/
    
    /*End Test Class*/
    
  }// end of main(String[] args)

}// end of class PostOffice