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package org.apache.james.pop3server.core;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import javax.mail.MessagingException;

import org.apache.james.imap.mailbox.MailboxSession;
import org.apache.james.imap.mailbox.MessageRange;
import org.apache.james.imap.mailbox.MessageResult;
import org.apache.james.imap.mailbox.MessageResult.FetchGroup;
import org.apache.james.imap.mailbox.util.FetchGroupImpl;
import org.apache.james.pop3server.POP3Response;
import org.apache.james.pop3server.POP3Session;
import org.apache.james.protocols.api.CommandHandler;
import org.apache.james.protocols.api.Request;
import org.apache.james.protocols.api.Response;

/**
  * Handles STAT command
  */
public class StatCmdHandler implements CommandHandler<POP3Session> {
	private final static String COMMAND_NAME = "STAT";

	/**
     * Handler method called upon receipt of a STAT command.
     * Returns the number of messages in the mailbox and its
     * aggregate size.
     *
	 */
    public Response onCommand(POP3Session session, Request request) {
        POP3Response response = null;
        if (session.getHandlerState() == POP3Session.TRANSACTION) {
  
            try {
            	List<Long> uidList = (List<Long>) session.getState().get(POP3Session.UID_LIST);
                List<Long> deletedUidList = (List<Long>) session.getState().get(POP3Session.DELETED_UID_LIST);

                MailboxSession mailboxSession = (MailboxSession) session.getState().get(POP3Session.MAILBOX_SESSION);
            	Iterator<MessageResult> results =  session.getUserMailbox().getMessages(MessageRange.range(uidList.get(0), uidList.get(uidList.size() -1)), new FetchGroupImpl(FetchGroup.MINIMAL), mailboxSession);

                long size = 0;
                int count = 0;
            	List<MessageResult> validResults = new ArrayList<MessageResult>();
                while (results.hasNext()) {
                	MessageResult result = results.next();
                    if (deletedUidList.contains(result.getUid()) == false) {
                        size += result.getSize();
                        count++;
                        validResults.add(result);
                    }
                }
                StringBuilder responseBuffer =
                    new StringBuilder(32)
                            .append(count)
                            .append(" ")
                            .append(size);
                response = new POP3Response(POP3Response.OK_RESPONSE,responseBuffer.toString());
            } catch (MessagingException me) {
                response = new POP3Response(POP3Response.ERR_RESPONSE);
            }
        } else {
            response = new POP3Response(POP3Response.ERR_RESPONSE);
        }
        return response;
    }



    /**
     * @see org.apache.james.api.protocol.CommonCommandHandler#getImplCommands()
     */
    public Collection<String> getImplCommands() {
        List<String> commands = new ArrayList<String>();
        commands.add(COMMAND_NAME);
        return commands;
    }

}

@@ -2618,17 +2618,132 @@
 _LIST);%0A
-%0A
+                long size = 0;%0A                int count = 0;%0A                if (uidList.isEmpty() == false) %7B%0A    
         
@@ -2864,17 +2864,24 @@
         
+  
-%09
+      
 Iterator
@@ -3070,16 +3070,17 @@
 sion);%0A%0A
+%0A
         
@@ -3085,60 +3085,8 @@
     
-      long size = 0;%0A                int count = 0;%0A
     
@@ -3087,27 +3087,24 @@
             
-  %09
 List%3CMessage
@@ -3174,16 +3174,20 @@
         
+    
 while (r
@@ -3222,17 +3222,24 @@
         
+        
-%09
 MessageR
@@ -3265,24 +3265,28 @@
 lts.next();%0A
+    
             
@@ -3374,16 +3374,20 @@
         
+  
+  
 size += 
@@ -3428,16 +3428,20 @@
         
+    
 count++;
@@ -3465,16 +3465,20 @@
         
+ 
+   
 validRes
@@ -3495,16 +3495,42 @@
 esult);%0A
+                        %7D%0A
         

Fix stat command, which was failing on empty inbox. This effected thunderbird sometimes.. (Thx Eric for the pointer)