/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2015, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.as.cli.parsing.operation;

import org.jboss.as.cli.CommandFormatException;
import org.jboss.as.cli.parsing.CharacterHandler;
import org.jboss.as.cli.parsing.DefaultParsingState;
import org.jboss.as.cli.parsing.EnterStateCharacterHandler;
import org.jboss.as.cli.parsing.GlobalCharacterHandlers;
import org.jboss.as.cli.parsing.LineBreakHandler;
import org.jboss.as.cli.parsing.ParsingContext;


/**
 *
 * @author Alexey Loubyansky
 */
public class HeaderState extends DefaultParsingState {

    public static final HeaderState INSTANCE = new HeaderState();
    public static final String ID = "HEADER";

    HeaderState() {
        this(HeaderNameState.INSTANCE, HeaderValueState.INSTANCE);
    }

    HeaderState(HeaderNameState headerName, final HeaderValueState headerValue) {
        super(ID);
        this.setIgnoreWhitespaces(true);
        setEnterHandler(new EnterStateCharacterHandler(headerName));
        putHandler(';', GlobalCharacterHandlers.LEAVE_STATE_HANDLER);
        putHandler('}', GlobalCharacterHandlers.LEAVE_STATE_HANDLER);
        final NameValueSeparatorState nameValueSep = new NameValueSeparatorState(headerValue);
        enterState('=', nameValueSep);
        setDefaultHandler(new EnterStateCharacterHandler(headerValue));
        setReturnHandler(new CharacterHandler(){
            @Override
            public void handle(ParsingContext ctx) throws CommandFormatException {
                if(ctx.isEndOfContent()) {
                    return;
                }
                final char ch = ctx.getCharacter();
                if(ch == '=') {
                    ctx.enterState(nameValueSep);
                } else if (!Character.isWhitespace(ch) && ch != '\\') {
                    ctx.leaveState();
                }
            }});
    }

    private static class NameValueSeparatorState extends DefaultParsingState {
        NameValueSeparatorState(final HeaderValueState valueState) {
            super("NAME_VALUE_SEPARATOR");
            setDefaultHandler(new LineBreakHandler(false, false){
                @Override
                protected void doHandle(ParsingContext ctx) throws CommandFormatException {
                    ctx.enterState(valueState);
                }
            });
            setReturnHandler(GlobalCharacterHandlers.LEAVE_STATE_HANDLER);
            setIgnoreWhitespaces(true);
        }
    };
}