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/*
* Fabric3
* Copyright (c) 2009-2011 Metaform Systems
*
* Fabric3 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version, with the
* following exception:
*
* Linking this software statically or dynamically with other
* modules is making a combined work based on this software.
* Thus, the terms and conditions of the GNU General Public
* License cover the whole combination.
*
* As a special exception, the copyright holders of this software
* give you permission to link this software with independent
* modules to produce an executable, regardless of the license
* terms of these independent modules, and to copy and distribute
* the resulting executable under terms of your choice, provided
* that you also meet, for each linked independent module, the
* terms and conditions of the license of that module. An
* independent module is a module which is not derived from or
* based on this software. If you modify this software, you may
* extend this exception to your version of the software, but
* you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version.
*
* Fabric3 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 for more details.
*
* You should have received a copy of the
* GNU General Public License along with Fabric3.
* If not, see .
*/
package org.fabric3.fabric.lcm;

import java.net.URI;

import org.osoa.sca.annotations.Constructor;
import org.osoa.sca.annotations.Init;
import org.osoa.sca.annotations.Property;
import org.osoa.sca.annotations.Reference;

import org.fabric3.api.annotation.monitor.Monitor;
import org.fabric3.host.Names;
import org.fabric3.host.runtime.HostInfo;
import org.fabric3.model.type.component.Autowire;
import org.fabric3.model.type.component.ComponentDefinition;
import org.fabric3.model.type.component.Composite;
import org.fabric3.model.type.component.CompositeImplementation;
import org.fabric3.spi.lcm.LogicalComponentManager;
import org.fabric3.spi.model.instance.LogicalComponent;
import org.fabric3.spi.model.instance.LogicalCompositeComponent;
import org.fabric3.spi.model.instance.LogicalState;
import org.fabric3.spi.util.UriHelper;

/**
 * Implementation of LogicalComponentManager. The runtime domain configuration (created during bootstrap) defaults autowire to ON; the application
 * domain defaults autowire to OFF, which can be overridden by the runtime configuration.
 *
 * @version $Rev: 10055 $ $Date: 2011-03-05 21:31:39 +0000 (Sat, 05 Mar 2011) $
 */
public class LogicalComponentManagerImpl implements LogicalComponentManager {
    private URI domainUri;
    private String autowireValue;
    private Autowire autowire = Autowire.OFF;
    private LogicalCompositeComponent domain;
    private LCMMonitor monitor;

    /**
     * Bootstrap constructor.
     */
    public LogicalComponentManagerImpl() {
        this.domainUri = Names.RUNTIME_URI;
        this.autowire = Autowire.ON; // autowire on by default in the runtime domain
        initializeDomainComposite();
    }

    @Constructor
    public LogicalComponentManagerImpl(@Reference HostInfo info) {
        domainUri = info.getDomain();
        initializeDomainComposite();
    }

    @Property(required = false)
    public void setAutowire(String value) {
        autowireValue = value;
    }

    @Monitor
    public void setMonitor(LCMMonitor monitor) {
        this.monitor = monitor;
    }

    @Init
    public void init() {
        if (autowireValue == null) {
            return;
        }
        Autowire autowire;
        // can't use Enum.valueOf(..) as INHERITED is not a valid value for the domain composite
        if ("ON".equalsIgnoreCase(autowireValue.trim())) {
            autowire = Autowire.ON;
        } else if ("OFF".equalsIgnoreCase(autowireValue.trim())) {
            autowire = Autowire.OFF;
        } else {
            monitor.invalidAutowireValue(autowireValue);
            autowire = Autowire.OFF;
        }
        this.autowire = autowire;
    }

    public LogicalComponent getComponent(URI uri) {
        String defragmentedUri = UriHelper.getDefragmentedNameAsString(uri);
        String domainString = domain.getUri().toString();
        String[] hierarchy = defragmentedUri.substring(domainString.length() + 1).split("/");
        String currentUri = domainString;
        LogicalComponent currentComponent = domain;
        for (String name : hierarchy) {
            currentUri = currentUri + "/" + name;
            if (currentComponent instanceof LogicalCompositeComponent) {
                LogicalCompositeComponent composite = (LogicalCompositeComponent) currentComponent;
                currentComponent = composite.getComponent(URI.create(currentUri));
            }
            if (currentComponent == null) {
                return null;
            }
        }
        return currentComponent;
    }

    public LogicalCompositeComponent getRootComponent() {
        return domain;
    }

    public void replaceRootComponent(LogicalCompositeComponent component) {
        domain = component;
    }

    private void initializeDomainComposite() {
        Composite type = new Composite(null);
        CompositeImplementation impl = new CompositeImplementation();
        impl.setComponentType(type);
        ComponentDefinition definition = new ComponentDefinition(domainUri.toString());
        definition.setImplementation(impl);
        definition.setContributionUri(Names.BOOT_CONTRIBUTION);
        type.setAutowire(autowire);
        domain = new LogicalCompositeComponent(domainUri, definition, null);
        domain.setState(LogicalState.PROVISIONED);
        domain.setAutowire(autowire);
    }

}