/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2012, 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;


import org.jboss.as.cli.parsing.DefaultParsingState;
import org.jboss.as.cli.parsing.EnterStateCharacterHandler;
import org.jboss.as.cli.parsing.StateParser;
import org.jboss.as.cli.parsing.arguments.ArgumentValueCallbackHandler;
import org.jboss.as.cli.parsing.arguments.ArgumentValueInitialState;
import org.jboss.as.cli.parsing.arguments.ArgumentValueState;
import org.jboss.as.cli.parsing.arguments.ListState;
import org.jboss.as.cli.parsing.arguments.NonObjectArgumentValueState;
import org.jboss.dmr.ModelNode;


/**
 *
 * @author Alexey Loubyansky
 */
public interface ArgumentValueConverter {

    abstract class DMRWithFallbackConverter implements ArgumentValueConverter {
        @Override
        public ModelNode fromString(CommandContext ctx, String value) throws CommandFormatException {
            if(value == null) {
                return new ModelNode();
            }
            if(ctx.isResolveParameterValues()) {
                value = Util.resolveProperties(value);
            }
            try {
                return ModelNode.fromString(value);
            } catch(Exception e) {
                return fromNonDMRString(ctx, value);
            }
        }

        protected abstract ModelNode fromNonDMRString(CommandContext ctx, String value) throws CommandFormatException;
    }

    ArgumentValueConverter DEFAULT = new ArgumentValueConverter() {
        @Override
        public ModelNode fromString(CommandContext ctx, String value) throws CommandFormatException {
            if (value == null) {
                return new ModelNode();
            }
            if(ctx.isResolveParameterValues()) {
                value = Util.resolveProperties(value);
            }
            ModelNode toSet = null;
            try {
                toSet = ModelNode.fromString(value);
            } catch (Exception e) {
                final ArgumentValueCallbackHandler handler = new ArgumentValueCallbackHandler();
                StateParser.parse(value, handler, ArgumentValueInitialState.INSTANCE);
                toSet = handler.getResult();
            }
            return toSet;
        }
    };

    /**
     * Basically, for STRING with support for expressions.
     */
    ArgumentValueConverter NON_OBJECT = new DMRWithFallbackConverter() {
        final DefaultParsingState initialState = new DefaultParsingState("IE"){
            {
                setDefaultHandler(new EnterStateCharacterHandler(NonObjectArgumentValueState.INSTANCE));
            }
        };
        @Override
        protected ModelNode fromNonDMRString(CommandContext ctx, String value) throws CommandFormatException {
            final ArgumentValueCallbackHandler handler = new ArgumentValueCallbackHandler();
            StateParser.parse(value, handler, initialState);
            return handler.getResult();
        }
    };

    ArgumentValueConverter LIST = new DMRWithFallbackConverter() {
        final DefaultParsingState initialState = new DefaultParsingState("IL"){
            {
                setDefaultHandler(new EnterStateCharacterHandler(new ListState(new ArgumentValueState())));
            }
        };
        @Override
        protected ModelNode fromNonDMRString(CommandContext ctx, String value) throws CommandFormatException {
            final ArgumentValueCallbackHandler handler = new ArgumentValueCallbackHandler();
            StateParser.parse(value, handler, initialState);
            return handler.getResult();
        }
    };

    ArgumentValueConverter PROPERTIES = new DMRWithFallbackConverter() {
        final DefaultParsingState initialState = new DefaultParsingState("IPL"){
            {
                setDefaultHandler(new EnterStateCharacterHandler(new ListState(new ArgumentValueState())));
            }
        };
        @Override
        protected ModelNode fromNonDMRString(CommandContext ctx, String value) throws CommandFormatException {
            final ArgumentValueCallbackHandler handler = new ArgumentValueCallbackHandler();
            StateParser.parse(value, handler, initialState);
            return handler.getResult();
        }
    };

    ModelNode fromString(CommandContext ctx, String value) throws CommandFormatException;
}
