/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2011, 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.controller;

import org.jboss.dmr.ModelNode;

import java.util.Collection;
import org.jboss.dmr.ModelType;

/**
 * Simple {@link AbstractWriteAttributeHandler} that triggers putting the process in a restart-required state if attribute that
 * has flag {@link org.jboss.as.controller.registry.AttributeAccess.Flag#RESTART_JVM} otherwise it puts process in
 * reload-required state.
 *
 * @author Brian Stansberry (c) 2011 Red Hat Inc.
 */
public class ReloadRequiredWriteAttributeHandler extends AbstractWriteAttributeHandler<Void> {

    public ReloadRequiredWriteAttributeHandler(final AttributeDefinition... definitions) {
        super(definitions);
    }

    public ReloadRequiredWriteAttributeHandler(final Collection<AttributeDefinition> definitions) {
        super(definitions);
    }

    @Override
    protected boolean applyUpdateToRuntime(OperationContext context, ModelNode operation, String attributeName, ModelNode resolvedValue, ModelNode currentValue, HandbackHolder<Void> voidHandback) throws OperationFailedException {
//      Some might ask why we are comparing a resolvedValue with the currentValuewhich is not resolved.
//      Well the issue is that the context that would permit to resolve the currentValue might have changed thus
//      the resolved value for the currentValue wouldn't be correct.
//      In fact we just can't resolve the currentValue without any doubt. When in doubt reload, so we will return true in this case.
//      For example if the currentValue is ${foo} and that for some reason foo has changed in between, then we should reload even if now ${foo} resolves
//      as resolvedValue.
        ModelNode resolvedTypedValue = convertToType(attributeName, resolvedValue);
        return !resolvedTypedValue.equals(currentValue);
    }

    private ModelNode convertToType(String attributeName, ModelNode resolvedValue) {
        AttributeDefinition attributeDefinition = getAttributeDefinition(attributeName);
        ModelType type;
        if (attributeDefinition != null) {
            type = attributeDefinition.getType();
        } else {
            type = ModelType.STRING;
        }
        ModelNode converted = resolvedValue.clone();
        try {
            switch (type) {
                case BIG_DECIMAL:
                    converted.set(resolvedValue.asBigDecimal());
                    break;
                case BIG_INTEGER:
                    converted.set(resolvedValue.asBigInteger());
                    break;
                case BOOLEAN:
                    converted.set(resolvedValue.asBoolean());
                    break;
                case BYTES:
                    converted.set(resolvedValue.asBytes());
                    break;
                case DOUBLE:
                    converted.set(resolvedValue.asDouble());
                    break;
                case INT:
                    converted.set(resolvedValue.asInt());
                    break;
                case LIST:
                    break;
                case LONG:
                    converted.set(resolvedValue.asLong());
                    break;
                case OBJECT:
                    break;
                case PROPERTY:
                    break;
                case STRING:
                    converted.set(resolvedValue.asString());
                    break;
                case TYPE:
                    converted.set(resolvedValue.asType());
                    break;
                case UNDEFINED:
                    break;
            }
        } catch (IllegalArgumentException ex) {

        }
        return converted;
    }

    @Override
    protected void revertUpdateToRuntime(OperationContext context, ModelNode operation, String attributeName, ModelNode valueToRestore, ModelNode resolvedValue, Void handback) throws OperationFailedException {
        // no-op
    }
}
