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package org.glassfish.virtualization.config;

import com.sun.enterprise.config.serverbeans.Domain;
import com.sun.enterprise.config.serverbeans.DomainExtension;
import com.sun.enterprise.util.SystemPropertyConstants;

import org.glassfish.api.I18n;
import org.glassfish.api.Param;
import org.glassfish.api.admin.AdminCommandContext;
import org.glassfish.config.support.*;
import org.jvnet.hk2.annotations.Inject;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.config.*;

import java.beans.PropertyVetoException;
import java.util.List;

/**
 * Top level configuration for all virtualization related config. For now, a bit of
 * a mess, will need to review this past prototype stage.
 *
 * @author Jerome Dochez
 */
@Configured
@Singleton
public interface Virtualizations extends DomainExtension {

    @Element("*")
    List getVirtualizations();

    @Attribute(defaultValue = "${com.sun.aas.instanceRoot}/virt/disks")
    String getDisksLocation();
    public void setDisksLocation();

    @Attribute(defaultValue = "${com.sun.aas.instanceRoot}/virt/templates")
    String getTemplatesLocation();
    public void setTemplatesLocation();

    
    // FIXME -- jgish -- is this already available somewhere else?
    @Attribute(defaultValue = "${com.sun.aas.instanceRoot}/" +
                            SystemPropertyConstants.DOCROOT_PROPERTY)
    String getDocRoot();

    /**
     * Returns a virtualization configuration using the virtualization name.
     * @param name the virtualization configuration name
     * @return  the virtualization configuration if found or null;
     */
    @DuckTyped
    Virtualization byName(String name);

    public class Duck {

        public static Virtualization byName(Virtualizations self, String name) {
            for (Virtualization v : self.getVirtualizations()) {
                if (v.getName().equals(name)) {
                    return v;
                }
            }
            return null;
        }
    }

    @Service
    public class VirtResolver implements CrudResolver {
        @Inject
        Domain domain;

        @Inject(optional = true)
        Virtualizations virt = null;

        @Override
        public  T resolve(AdminCommandContext context, Class type)  {
            if (virt!=null) return (T) virt;
            try {
                virt = (Virtualizations) ConfigSupport.apply(new SingleConfigCode() {
                    @Override
                    public Object run(Domain wDomain) throws PropertyVetoException, TransactionFailure {
                        Virtualizations v = wDomain.createChild(Virtualizations.class);
                        wDomain.getExtensions().add(v);
                        return v;
                    }
                }, domain);
            } catch (TransactionFailure t)  {
                throw new RuntimeException(t);
            }
            return (T) virt;
        }
    }
}