/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 *
 * Contributor(s):
 *
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.mail.imap.protocol;

import java.io.*;
import java.util.*;
import com.sun.mail.util.*;
import com.sun.mail.iap.*;

/**
 * This class represents a response obtained from the input stream
 * of an IMAP server.
 *
 * @author  John Mani
 */

public class FetchResponse extends IMAPResponse {
    private Item[] items;

    public FetchResponse(Protocol p) 
		throws IOException, ProtocolException {
	super(p);
	parse();
    }

    public FetchResponse(IMAPResponse r)
		throws IOException, ProtocolException {
	super(r);
	parse();
    }

    public int getItemCount() {
	return items.length;
    }

    public Item getItem(int index) {
	return items[index];
    }

    public Item getItem(Class c) {
	for (int i = 0; i < items.length; i++) {
	    if (c.isInstance(items[i]))
		return items[i];
	}

	return null;
    }

    public static Item getItem(Response[] r, int msgno, Class c) {
	if (r == null)
	    return null;

	for (int i = 0; i < r.length; i++) {

	    if (r[i] == null ||
		!(r[i] instanceof FetchResponse) ||
		((FetchResponse)r[i]).getNumber() != msgno)
		continue;

	    FetchResponse f = (FetchResponse)r[i];
	    for (int j = 0; j < f.items.length; j++) {
		if (c.isInstance(f.items[j]))
		    return f.items[j];
	    }
	}

	return null;
    }

    private final static char[] HEADER = {'.','H','E','A','D','E','R'};
    private final static char[] TEXT = {'.','T','E','X','T'};

	
    private void parse() throws ParsingException {
	skipSpaces();
	if (buffer[index] != '(')
	    throw new ParsingException(
		"error in FETCH parsing, missing '(' at index " + index);

	Vector v = new Vector();
	Item i = null;
	do {
	    index++; // skip '(', or SPACE

	    if (index >= size)
		throw new ParsingException(
		"error in FETCH parsing, ran off end of buffer, size " + size);

	    switch(buffer[index]) {
	    case 'E': 
		if (match(ENVELOPE.name)) {
		    index += ENVELOPE.name.length; // skip "ENVELOPE"
		    i = new ENVELOPE(this);
		}
		break;
	    case 'F': 
		if (match(FLAGS.name)) {
		    index += FLAGS.name.length; // skip "FLAGS"
		    i = new FLAGS((IMAPResponse)this);
		}
		break;
	    case 'I': 
		if (match(INTERNALDATE.name)) {
		    index += INTERNALDATE.name.length; // skip "INTERNALDATE"
		    i = new INTERNALDATE(this);
		}
		break;
	    case 'B': 
		if (match(BODY.name)) {
		    if (buffer[index+4] == '[') {
			index += BODY.name.length; // skip "BODY"
			i = new BODY(this);
		    }
		    else {
			if (match(BODYSTRUCTURE.name))
			    index += BODYSTRUCTURE.name.length;
			    // skip "BODYSTRUCTURE"
			else
			    index += BODY.name.length; // skip "BODY"
			i = new BODYSTRUCTURE(this);
		    }
		}
		break;
	    case 'R':
		if (match(RFC822SIZE.name)) {
		    index += RFC822SIZE.name.length; // skip "RFC822.SIZE"
		    i = new RFC822SIZE(this);
		}
		else {
		    if (match(RFC822DATA.name)) {
			index += RFC822DATA.name.length;
			if (match(HEADER))
			    index += HEADER.length; // skip ".HEADER"
			else if (match(TEXT))
				index += TEXT.length; // skip ".TEXT"
			i = new RFC822DATA(this);
		    }
		}
		break;
	    case 'U': 
		if (match(UID.name)) {
		    index += UID.name.length;
		    i = new UID(this);
		}
		break;
	    default: 
	    }
	    if (i != null)
		v.addElement(i);
	} while (buffer[index] != ')');

	index++; // skip ')'
	items = new Item[v.size()];
	v.copyInto(items);
    }

    /*
     * itemName is the name of the IMAP item to compare against.
     * NOTE that itemName *must* be all uppercase.
     */
    private boolean match(char[] itemName) {
	int len = itemName.length;
	for (int i = 0, j = index; i < len;)
	    // IMAP tokens are case-insensitive. We store itemNames in
	    // uppercase, so convert operand to uppercase before comparing.
	    if (Character.toUpperCase((char)buffer[j++]) != itemName[i++])
		return false;
	return true;
    }
}
