/*
 * RHQ Management Platform
 * Copyright (C) 2005-2009 Red Hat, Inc.
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation, and/or the GNU Lesser
 * General Public License, version 2.1, also as published by the Free
 * Software Foundation.
 *
 * This program 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 General Public License and the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * and the GNU Lesser General Public License along with this program;
 * if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

package org.rhq.rhqtransform.impl;

import java.util.Collection;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.rhq.augeas.node.AugeasNode;
import org.rhq.augeas.tree.AugeasTree;
import org.rhq.core.domain.configuration.Configuration;
import org.rhq.core.domain.configuration.Property;
import org.rhq.core.domain.configuration.PropertyList;
import org.rhq.core.domain.configuration.PropertyMap;
import org.rhq.core.domain.configuration.PropertySimple;
import org.rhq.core.domain.configuration.definition.ConfigurationDefinition;
import org.rhq.core.domain.configuration.definition.PropertyDefinition;
import org.rhq.core.domain.configuration.definition.PropertyDefinitionList;
import org.rhq.core.domain.configuration.definition.PropertyDefinitionMap;
import org.rhq.core.domain.configuration.definition.PropertyDefinitionSimple;
import org.rhq.rhqtransform.AugeasRhqException;
import org.rhq.rhqtransform.AugeasToConfiguration;
import org.rhq.rhqtransform.NameMap;


/**
 * Basic implementation of Augeas mapping to RHQ configuration based on property names.
 * 
 * @author Filip Drabek
 * @author Ian Springer
 */
public class AugeasToConfigurationSimple implements AugeasToConfiguration {
    private final Log log = LogFactory.getLog(this.getClass());
    protected AugeasTree tree;
    protected NameMap nameMap;

    public AugeasToConfigurationSimple() {

    }

    public void setTree(AugeasTree tree) {
        this.tree = tree;
    }

    public void setNameMap(NameMap nameMap) {
        this.nameMap = nameMap;
    }

    public Configuration loadResourceConfiguration(AugeasNode startNode, ConfigurationDefinition resourceConfigDef)
        throws AugeasRhqException {

        Configuration resourceConfig = new Configuration();

        Collection<PropertyDefinition> propDefs = resourceConfigDef.getPropertyDefinitions().values();

        for (PropertyDefinition propDef : propDefs) {
            resourceConfig.put(loadProperty(propDef, startNode));
        }

        return resourceConfig;
    }

    public Property loadProperty(PropertyDefinition propDef, AugeasNode parentNode) throws AugeasRhqException {

        Property prop;
        if (propDef instanceof PropertyDefinitionSimple) {
            prop = createPropertySimple((PropertyDefinitionSimple) propDef, parentNode);
        } else if (propDef instanceof PropertyDefinitionMap) {
            prop = createPropertyMap((PropertyDefinitionMap) propDef, parentNode);
        } else if (propDef instanceof PropertyDefinitionList) {
            prop = createPropertyList((PropertyDefinitionList) propDef, parentNode);
        } else {
            throw new IllegalStateException("Unsupported PropertyDefinition subclass: " + propDef.getClass().getName());
        }
        return prop;
    }

    public Property createPropertySimple(PropertyDefinitionSimple propDefSimple, AugeasNode node) throws AugeasRhqException {
        Object value;
        value = node.getValue();
        return new PropertySimple(propDefSimple.getName(), value);
    }

    public PropertyMap createPropertyMap(PropertyDefinitionMap propDefMap, AugeasNode node) throws AugeasRhqException {
        PropertyMap propMap = new PropertyMap(propDefMap.getName());
        for (PropertyDefinition mapEntryPropDef : propDefMap.getPropertyDefinitions().values()) {
            propMap.put(loadProperty(mapEntryPropDef, node));
        }
        return propMap;
    }

    public Property createPropertyList(PropertyDefinitionList propDefList, AugeasNode node) throws AugeasRhqException {

        PropertyList propList = new PropertyList(propDefList.getName());

        List<AugeasNode> nodes = tree.matchRelative(node, propDefList.getName());
        PropertyDefinition listMemberPropDef = propDefList.getMemberDefinition();

        for (AugeasNode listMemberNode : nodes) {
            propList.add(loadProperty(listMemberPropDef, listMemberNode));
        }

        return propList;
    }
}
