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/* All content copyright (c) 2003-2012 Terracotta, Inc., except as may otherwise be noted in a separate copyright notice.  All rights reserved.*/

package org.terracotta.management.resource.services;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.terracotta.management.ServiceExecutionException;
import org.terracotta.management.ServiceLocator;
import org.terracotta.management.resource.AgentEntityV2;
import org.terracotta.management.resource.AgentMetadataEntityV2;
import org.terracotta.management.resource.Representable;
import org.terracotta.management.resource.ResponseEntityV2;
import org.terracotta.management.resource.exceptions.ResourceRuntimeException;
import org.terracotta.management.resource.services.validator.RequestValidator;

import com.terracotta.management.resource.services.utils.UriInfoUtils;

import java.util.Set;

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

/**
 * REST facade of agents service.
 *
 * @author Anthony Dahanne
 */
@Path("/v2/agents")
public final class AgentsResourceServiceImplV2 {
  private static final Logger LOG = LoggerFactory.getLogger(AgentsResourceServiceImplV2.class);

  private final AgentServiceV2 agentService;

  private final RequestValidator validator;

  public AgentsResourceServiceImplV2() {
    this.agentService = ServiceLocator.locate(AgentServiceV2.class);
    this.validator = ServiceLocator.locate(RequestValidator.class);
  }

  /**
   * 
   * A top level resource that provides each agents root {@link Representable} objects.
   * 
   * 
   * @param info
   *          - {@link UriInfo} for this resource request
   * @return a collection of {@link AgentEntityV2} objects when successful.
   */
  @GET
  @Produces(MediaType.APPLICATION_JSON)
  public ResponseEntityV2 getAgents(@Context UriInfo info) {
    LOG.debug(String.format("Invoking AgentsResourceServiceImplV2.getAgents: %s", info.getRequestUri()));

    Set idSet = UriInfoUtils.extractAgentIds(info);

    try {
      return agentService.getAgents(idSet);
    } catch (ServiceExecutionException see) {
      throw new ResourceRuntimeException("Failed to get agents", see, Response.Status.BAD_REQUEST.getStatusCode());
    }
  }

  /**
   * 
   * A resource that provides discovery of all agents and reveals metadata about each agents API and state.
   * 
   * 
   * @param info
   *          - {@link UriInfo} for this resource request
   * @return a collection of {@link AgentMetadataEntityV2} objects when successful.
   */
  @GET
  @Path("/info")
  @Produces(MediaType.APPLICATION_JSON)
  public ResponseEntityV2 getAgentsMetadata(@Context UriInfo info) {
    LOG.debug(String.format("Invoking AgentsResourceServiceImplV2.getAgentsMetadata: %s", info.getRequestUri()));

    validator.validateSafe(info);
    Set idSet = UriInfoUtils.extractAgentIds(info);

    try {
      return agentService.getAgentsMetadata(idSet);
    } catch (ServiceExecutionException see) {
      throw new ResourceRuntimeException("Failed to get agents metadata", see, Response.Status.BAD_REQUEST.getStatusCode());
    }
  }

}