/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.brooklyn.entity.group;

import java.util.Arrays;
import java.util.Collection;

import org.apache.brooklyn.api.entity.Entity;
import org.apache.brooklyn.api.location.Location;
import org.apache.brooklyn.api.mgmt.Task;
import org.apache.brooklyn.core.entity.Entities;
import org.apache.brooklyn.core.entity.EntityInternal;
import org.apache.brooklyn.core.entity.trait.Startable;
import org.apache.brooklyn.util.exceptions.Exceptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;

public class DynamicRegionsFabricImpl extends DynamicFabricImpl implements DynamicRegionsFabric {

    private static final Logger log = LoggerFactory.getLogger(DynamicRegionsFabricImpl.class);

    @Override
    public String addRegion(String location) {
        Preconditions.checkNotNull(location, "location");
        Location l = getManagementContext().getLocationRegistry().resolve(location);
        addLocations(Arrays.asList(l));
        
        Entity e = addCluster(l);
        ((EntityInternal)e).addLocations(Arrays.asList(l));
        if (e instanceof Startable) {
            Task<?> task = e.invoke(Startable.START, ImmutableMap.of("locations", ImmutableList.of(l)));
            task.getUnchecked();
        }
        return e.getId();
    }

    @Override
    public void removeRegion(String id) {
        Entity entity = getManagementContext().getEntityManager().getEntity(id);
        Preconditions.checkNotNull(entity, "No entity found for %s", id);
        Preconditions.checkArgument(this.equals(entity.getParent()), "Wrong parent (%s) for %s", entity.getParent(), entity);
        Collection<Location> childLocations = entity.getLocations();
        
        if (entity instanceof Startable) {
            try {
                Entities.invokeEffector(this, entity, Startable.STOP).get();
            } catch (Exception e) {
                Exceptions.propagateIfFatal(e);
                log.warn("Error stopping "+entity+" ("+e+"); proceeding to remove it anyway");
                log.debug("Error stopping "+entity+" ("+e+"); proceeding to remove it anyway", e);
            }
        }
        removeChild(entity);
        removeLocations(childLocations);
    }
    
}