/*
 * Copyright (c) 2014, 2015 Red Hat, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

package org.opendaylight.neutron.northbound.api;

import java.net.HttpURLConnection;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import org.codehaus.enunciate.jaxrs.ResponseCode;
import org.codehaus.enunciate.jaxrs.StatusCodes;
import org.opendaylight.neutron.spi.INeutronLoadBalancerCRUD;
import org.opendaylight.neutron.spi.NeutronCRUDInterfaces;
import org.opendaylight.neutron.spi.NeutronLoadBalancer;

/**
 * Neutron Northbound REST APIs for LoadBalancers.<br>
 * This class provides REST APIs for managing neutron LoadBalancers
 *
 * <br>
 * <br>
 * Authentication scheme : <b>HTTP Basic</b><br>
 * Authentication realm : <b>opendaylight</b><br>
 * Transport : <b>HTTP and HTTPS</b><br>
 * <br>
 * HTTPS Authentication is disabled by default. Administrator can enable it in
 * tomcat-server.xml after adding a proper keystore / SSL certificate from a
 * trusted authority.<br>
 * More info :
 * http://tomcat.apache.org/tomcat-7.0-doc/ssl-howto.html#Configuration
 *
 */
@Path("/lbaas/loadbalancers")
public class NeutronLoadBalancerNorthbound
    extends AbstractNeutronNorthbound<NeutronLoadBalancer, NeutronLoadBalancerRequest, INeutronLoadBalancerCRUD> {

    private static final String RESOURCE_NAME = "LoadBalancer";

    @Override
    protected String getResourceName() {
        return RESOURCE_NAME;
    }

    @Override
    protected NeutronLoadBalancer extractFields(NeutronLoadBalancer o, List<String> fields) {
        return o.extractFields(fields);
    }

    @Override
    protected NeutronLoadBalancerRequest newNeutronRequest(NeutronLoadBalancer o) {
        return new NeutronLoadBalancerRequest(o);
    }

    @Override
    protected INeutronLoadBalancerCRUD getNeutronCRUD() {
        NeutronCRUDInterfaces answer = new NeutronCRUDInterfaces().fetchINeutronLoadBalancerCRUD(this);
        if (answer.getLoadBalancerInterface() == null) {
            throw new ServiceUnavailableException(serviceUnavailable());
        }
        return answer.getLoadBalancerInterface();
    }

    /**
     * Returns a list of all LoadBalancer */
    @GET
    @Produces({ MediaType.APPLICATION_JSON })
    @StatusCodes({
            @ResponseCode(code = HttpURLConnection.HTTP_OK, condition = "Operation successful"),
            @ResponseCode(code = HttpURLConnection.HTTP_UNAUTHORIZED, condition = "Unauthorized"),
            @ResponseCode(code = HttpURLConnection.HTTP_NOT_IMPLEMENTED, condition = "Not Implemented"),
            @ResponseCode(code = HttpURLConnection.HTTP_UNAVAILABLE, condition = "No providers available") })

    public Response listGroups(
            // return fields
            @QueryParam("fields") List<String> fields,
            // OpenStack LoadBalancer attributes
            @QueryParam("id") String queryLoadBalancerID,
            @QueryParam("tenant_id") String queryLoadBalancerTenantID,
            @QueryParam("name") String queryLoadBalancerName,
            @QueryParam("status") String queryLoadBalancerStatus,
            @QueryParam("vip_address") String queryLoadBalancerVipAddress,
            @QueryParam("vip_subnet") String queryLoadBalancerVipSubnet,
            // pagination
            @QueryParam("limit") String limit,
            @QueryParam("marker") String marker,
            @QueryParam("page_reverse") String pageReverse
            // sorting not supported
    ) {
        INeutronLoadBalancerCRUD loadBalancerInterface = getNeutronCRUD();
        List<NeutronLoadBalancer> allLoadBalancers = loadBalancerInterface.getAll();
        List<NeutronLoadBalancer> ans = new ArrayList<NeutronLoadBalancer>();
        Iterator<NeutronLoadBalancer> i = allLoadBalancers.iterator();
        while (i.hasNext()) {
            NeutronLoadBalancer nsg = i.next();
            if ((queryLoadBalancerID == null ||
                    queryLoadBalancerID.equals(nsg.getID())) &&
                    (queryLoadBalancerTenantID == null ||
                            queryLoadBalancerTenantID.equals(nsg.getTenantID())) &&
                    (queryLoadBalancerName == null ||
                            queryLoadBalancerName.equals(nsg.getLoadBalancerName())) &&
                    (queryLoadBalancerVipAddress == null ||
                            queryLoadBalancerVipAddress.equals(nsg.getLoadBalancerVipAddress())) &&
                    (queryLoadBalancerVipSubnet == null ||
                            queryLoadBalancerVipSubnet.equals(nsg.getLoadBalancerVipSubnetID()))) {
                if (fields.size() > 0) {
                    ans.add(extractFields(nsg,fields));
                } else {
                    ans.add(nsg);
                }
            }
        }
        return Response.status(HttpURLConnection.HTTP_OK).entity(
                new NeutronLoadBalancerRequest(ans)).build();
    }

    /**
     * Returns a specific LoadBalancer */

    @Path("{loadBalancerID}")
    @GET
    @Produces({ MediaType.APPLICATION_JSON })

    @StatusCodes({
            @ResponseCode(code = HttpURLConnection.HTTP_OK, condition = "Operation successful"),
            @ResponseCode(code = HttpURLConnection.HTTP_UNAUTHORIZED, condition = "Unauthorized"),
            @ResponseCode(code = HttpURLConnection.HTTP_NOT_FOUND, condition = "Not Found"),
            @ResponseCode(code = HttpURLConnection.HTTP_NOT_IMPLEMENTED, condition = "Not Implemented"),
            @ResponseCode(code = HttpURLConnection.HTTP_UNAVAILABLE, condition = "No providers available") })
    public Response showLoadBalancer(@PathParam("loadBalancerID") String loadBalancerID,
            // return fields
            @QueryParam("fields") List<String> fields) {
        return show(loadBalancerID, fields);
    }

    /**
     * Creates new LoadBalancer */

    @POST
    @Produces({ MediaType.APPLICATION_JSON })
    @Consumes({ MediaType.APPLICATION_JSON })

    @StatusCodes({
            @ResponseCode(code = HttpURLConnection.HTTP_CREATED, condition = "Created"),
            @ResponseCode(code = HttpURLConnection.HTTP_UNAVAILABLE, condition = "No providers available") })
    public Response createLoadBalancers(final NeutronLoadBalancerRequest input) {
        return create(input);
    }

    /**
     * Updates a LoadBalancer Policy
     */
    @Path("{loadBalancerID}")
    @PUT
    @Produces({ MediaType.APPLICATION_JSON })
    @Consumes({ MediaType.APPLICATION_JSON })

    @StatusCodes({
            @ResponseCode(code = HttpURLConnection.HTTP_OK, condition = "Operation successful"),
            @ResponseCode(code = HttpURLConnection.HTTP_NOT_FOUND, condition = "Not Found"),
            @ResponseCode(code = HttpURLConnection.HTTP_UNAVAILABLE, condition = "No providers available") })
    public Response updateLoadBalancer(
            @PathParam("loadBalancerID") String loadBalancerID, final NeutronLoadBalancerRequest input) {
        return update(loadBalancerID, input);
    }

    /**
     * Deletes a LoadBalancer */

    @Path("{loadBalancerID}")
    @DELETE
    @StatusCodes({
            @ResponseCode(code = HttpURLConnection.HTTP_NO_CONTENT, condition = "No Content"),
            @ResponseCode(code = HttpURLConnection.HTTP_NOT_FOUND, condition = "Not Found"),
            @ResponseCode(code = HttpURLConnection.HTTP_UNAVAILABLE, condition = "No providers available") })
    public Response deleteLoadBalancer(
            @PathParam("loadBalancerID") String loadBalancerID) {
        return delete(loadBalancerID);
    }
}