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/*
 * Copyright 2010 Proofpoint, Inc.
 *
 * Licensed 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 io.airlift.discovery.client;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import io.airlift.units.Duration;

import java.util.List;

import static java.lang.String.format;

public class ServiceDescriptors
{
    private final String type;
    private final String pool;
    private final String eTag;
    private final Duration maxAge;
    private final List serviceDescriptors;

    public ServiceDescriptors(ServiceDescriptors serviceDescriptors,
            Duration maxAge,
            String eTag)
    {
        Preconditions.checkNotNull(serviceDescriptors, "serviceDescriptors is null");

        this.type = serviceDescriptors.type;
        this.pool = serviceDescriptors.pool;
        this.maxAge = maxAge;
        this.eTag = eTag;
        this.serviceDescriptors = serviceDescriptors.serviceDescriptors;
    }

    public ServiceDescriptors(String type,
            String pool,
            List serviceDescriptors,
            Duration maxAge,
            String eTag)
    {
        Preconditions.checkNotNull(type, "type is null");
        Preconditions.checkNotNull(serviceDescriptors, "serviceDescriptors is null");
        Preconditions.checkNotNull(maxAge, "maxAge is null");

        this.type = type;
        this.pool = pool;
        this.serviceDescriptors = ImmutableList.copyOf(serviceDescriptors);
        this.maxAge = maxAge;
        this.eTag = eTag;

        // verify service descriptors match expected type
        for (ServiceDescriptor serviceDescriptor : this.serviceDescriptors) {
            if (!type.equals(serviceDescriptor.getType()) || (pool != null && !pool.equals(serviceDescriptor.getPool()))) {
                throw new DiscoveryException(format("Expected %s service descriptor from pool %s, but was %s service descriptor from pool %s",
                        type,
                        pool,
                        serviceDescriptor.getType(),
                        serviceDescriptor.getPool()));
            }
        }
    }

    public String getType()
    {
        return type;
    }

    public String getPool()
    {
        return pool;
    }

    public String getETag()
    {
        return eTag;
    }

    public Duration getMaxAge()
    {
        return maxAge;
    }

    public List getServiceDescriptors()
    {
        return serviceDescriptors;
    }

}