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/**
 * Copyright (C) 2012 Ness Computing, 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 com.nesscomputing.service.discovery.server.resources;

import java.util.Collection;
import java.util.List;
import java.util.Map;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;


import org.apache.commons.lang3.StringUtils;

import com.google.common.collect.Lists;
import com.google.inject.Inject;
import com.nesscomputing.service.discovery.client.ReadOnlyDiscoveryClient;
import com.nesscomputing.service.discovery.client.ServiceInformation;

/**
 * Returns the state of the world as a JSON array. Can be limited by serviceName and serviceType.
 */
@Path("/state")
public class StateOfTheWorldResource
{
    private final ReadOnlyDiscoveryClient discoveryClient;

    @Inject
    public StateOfTheWorldResource(final ReadOnlyDiscoveryClient discoveryClient)
    {
        this.discoveryClient = discoveryClient;
    }

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public Response getState(@QueryParam("serviceName") final String serviceName,
                             @QueryParam("serviceType") final String serviceType)
    {
        final Collection result;

        if (!StringUtils.isBlank(serviceName)) {
            // serviceType can be null for this call, this returns all services
            result = discoveryClient.findAllServiceInformation(serviceName, serviceType);
        }
        else {
            result = Lists.newArrayList();
            final Map> serviceMap = discoveryClient.findAllServiceInformation();

            for (List serviceList : serviceMap.values()) {
                result.addAll(serviceList);
            }
        }

        return Response.ok(result).build();
    }
}