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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2011-2012 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 * file and include the License file at packager/legal/LICENSE.txt.
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 * GPL Classpath Exception:
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package org.glassfish.virtualization.spi;

import com.sun.enterprise.config.serverbeans.Cluster;
import org.glassfish.virtualization.config.ServerPoolConfig;
import org.glassfish.virtualization.config.VirtualMachineConfig;
import org.jvnet.hk2.config.*;

import java.beans.PropertyVetoException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;

/**
 * Internal runtime representation of a cluster implemented with virtual machines.
 */
public class VirtualCluster {

    final Cluster config;
    final AtomicInteger token = new AtomicInteger();
    final List vms = new ArrayList();

    public VirtualCluster(IAAS iaas, Cluster config) throws VirtException {
        this.config = config;
        token.set(config.getServerRef().size());
        for (VirtualMachineConfig vm :
                config.getExtensionsByType(VirtualMachineConfig.class)) {
            ServerPoolConfig serverPoolConfig = vm.getServerPool();
            ServerPool serverPool = iaas.byName(serverPoolConfig.getName());
            VirtualMachine virtualMachine = serverPool.vmByName(vm.getName());
            if (virtualMachine!=null)
                vms.add(virtualMachine);
        }
    }

    public Cluster getConfig() {
        return config;
    }

    public synchronized int allocateToken() {
        return token.addAndGet(1);
    }

    public synchronized void add(final VirtualMachine vm) {
        vms.add(vm);
    }



    public synchronized void remove(final VirtualMachine vm) {
        try {
            ConfigSupport.apply(new ConfigCode(){
                @Override
                public Object run(ConfigBeanProxy... params) throws PropertyVetoException, TransactionFailure {
                    Cluster wCluster = (Cluster) params[0];
                    VirtualMachineConfig vmConfig = config.getExtensionsByTypeAndName(VirtualMachineConfig.class, vm.getName());
                    if (vmConfig!=null) {
                        wCluster.getExtensions().remove(vmConfig);
                    } else {
                        throw new TransactionFailure("Cannot find virtual machine configuration under cluster");
                    }
                    return null;
                }
            }, config, vm.getServerPool().getConfig());
        } catch (TransactionFailure transactionFailure) {
            throw new RuntimeException(transactionFailure);
        }
        vms.remove(vm);
    }

    public void delete() {
        List copy = new ArrayList();
        copy.addAll(vms);
        for (VirtualMachine vm : copy) {
            remove(vm);
        }
    }

    public VirtualMachine vmByName(String name) {
        for (VirtualMachine vm : vms) {
            if (vm.getName().equals(name)) return vm;
        }
        return null;
    }

    public synchronized List getVMs() {
        return Collections.unmodifiableList(vms);
    }

}