/*
 * 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.INeutronSecurityRuleAware;
import org.opendaylight.neutron.spi.INeutronSecurityRuleCRUD;
import org.opendaylight.neutron.spi.NeutronCRUDInterfaces;
import org.opendaylight.neutron.spi.NeutronSecurityRule;

/**
 * Neutron Northbound REST APIs for Security Rule.<br>
 * This class provides REST APIs for managing neutron Security Rule
 * <p>
 * <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 ("/security-group-rules")
public class NeutronSecurityRulesNorthbound
    extends AbstractNeutronNorthbound<NeutronSecurityRule, NeutronSecurityRuleRequest, INeutronSecurityRuleCRUD, INeutronSecurityRuleAware> {
    private static final String RESOURCE_NAME = "Security Rule";

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

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

    @Override
    protected NeutronSecurityRuleRequest newNeutronRequest(NeutronSecurityRule o) {
        return new NeutronSecurityRuleRequest(o);
    }

    @Override
    protected INeutronSecurityRuleCRUD getNeutronCRUD() {
        NeutronCRUDInterfaces answer = new NeutronCRUDInterfaces().fetchINeutronSecurityRuleCRUD(this);
        if (answer.getSecurityRuleInterface() == null) {
            throw new ServiceUnavailableException(serviceUnavailable());
        }
        return answer.getSecurityRuleInterface();
    }

    @Override
    protected Object[] getInstances() {
        return NeutronUtil.getInstances(INeutronSecurityRuleAware.class, this);
    }

    @Override
    protected int canCreate(Object instance, NeutronSecurityRule singleton) {
        INeutronSecurityRuleAware service = (INeutronSecurityRuleAware) instance;
        return service.canCreateNeutronSecurityRule(singleton);
    }

    @Override
    protected void created(Object instance, NeutronSecurityRule singleton) {
        INeutronSecurityRuleAware service = (INeutronSecurityRuleAware) instance;
        service.neutronSecurityRuleCreated(singleton);
    }

    @Override
    protected int canUpdate(Object instance, NeutronSecurityRule delta, NeutronSecurityRule original) {
        INeutronSecurityRuleAware service = (INeutronSecurityRuleAware) instance;
        return service.canUpdateNeutronSecurityRule(delta, original);
    }

    @Override
    protected void updated(Object instance, NeutronSecurityRule updated) {
        INeutronSecurityRuleAware service = (INeutronSecurityRuleAware) instance;
        service.neutronSecurityRuleUpdated(updated);
    }

    @Override
    protected int canDelete(Object instance, NeutronSecurityRule singleton) {
        INeutronSecurityRuleAware service = (INeutronSecurityRuleAware) instance;
        return service.canDeleteNeutronSecurityRule(singleton);
    }

    @Override
    protected void deleted(Object instance, NeutronSecurityRule singleton) {
        INeutronSecurityRuleAware service = (INeutronSecurityRuleAware) instance;
        service.neutronSecurityRuleDeleted(singleton);
    }

    /**
     * Returns a list of all Security Rules
     */
    @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 listRules(
            // return fields
            @QueryParam ("fields") List<String> fields,
            // OpenStack security rule attributes
            @QueryParam ("id") String querySecurityRuleUUID,
            @QueryParam ("direction") String querySecurityRuleDirection,
            @QueryParam ("protocol") String querySecurityRuleProtocol,
            @QueryParam ("port_range_min") Integer querySecurityRulePortMin,
            @QueryParam ("port_range_max") Integer querySecurityRulePortMax,
            @QueryParam ("ethertype") String querySecurityRuleEthertype,
            @QueryParam ("remote_ip_prefix") String querySecurityRuleIpPrefix,
            @QueryParam ("remote_group_id") String querySecurityRemoteGroupID,
            @QueryParam ("security_group_id") String querySecurityRuleGroupID,
            @QueryParam ("tenant_id") String querySecurityRuleTenantID,
            @QueryParam ("limit") String limit,
            @QueryParam ("marker") String marker,
            @QueryParam ("page_reverse") String pageReverse
    ) {
        INeutronSecurityRuleCRUD securityRuleInterface = getNeutronCRUD();
        List<NeutronSecurityRule> allSecurityRules = securityRuleInterface.getAllNeutronSecurityRules();
        List<NeutronSecurityRule> ans = new ArrayList<NeutronSecurityRule>();
        Iterator<NeutronSecurityRule> i = allSecurityRules.iterator();
        while (i.hasNext()) {
            NeutronSecurityRule nsr = i.next();
            if ((querySecurityRuleUUID == null ||
                    querySecurityRuleUUID.equals(nsr.getID())) &&
                    (querySecurityRuleDirection == null ||
                            querySecurityRuleDirection.equals(nsr.getSecurityRuleDirection())) &&
                    (querySecurityRuleProtocol == null ||
                            querySecurityRuleProtocol.equals(nsr.getSecurityRuleProtocol())) &&
                    (querySecurityRulePortMin == null ||
                            querySecurityRulePortMin.equals(nsr.getSecurityRulePortMin())) &&
                    (querySecurityRulePortMax == null ||
                            querySecurityRulePortMax.equals(nsr.getSecurityRulePortMax())) &&
                    (querySecurityRuleEthertype == null ||
                            querySecurityRuleEthertype.equals(nsr.getSecurityRuleEthertype())) &&
                    (querySecurityRuleIpPrefix == null ||
                            querySecurityRuleIpPrefix.equals(nsr.getSecurityRuleRemoteIpPrefix())) &&
                    (querySecurityRuleGroupID == null ||
                            querySecurityRuleGroupID.equals(nsr.getSecurityRuleGroupID())) &&
                    (querySecurityRemoteGroupID == null ||
                            querySecurityRemoteGroupID.equals(nsr.getSecurityRemoteGroupID())) &&
                    (querySecurityRuleTenantID == null ||
                            querySecurityRuleTenantID.equals(nsr.getTenantID()))) {
                if (fields.size() > 0) {
                    ans.add(extractFields(nsr, fields));
                } else {
                    ans.add(nsr);
                }
            }
        }
        return Response.status(HttpURLConnection.HTTP_OK).entity(
                new NeutronSecurityRuleRequest(ans)).build();
    }

    /**
     * Returns a specific Security Rule
     */

    @Path ("{securityRuleUUID}")
    @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 showSecurityRule(@PathParam ("securityRuleUUID") String securityRuleUUID,
                                     // return fields
                                     @QueryParam ("fields") List<String> fields) {
        return show(securityRuleUUID, fields);
    }

    /**
     * Creates new Security Rule
     */

    @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 createSecurityRules(final NeutronSecurityRuleRequest input) {
        return create(input);
    }

    /**
     * Updates a Security Rule
     */

    @Path ("{securityRuleUUID}")
    @PUT
    @Produces ({MediaType.APPLICATION_JSON})
    @Consumes ({MediaType.APPLICATION_JSON})
    @StatusCodes ({
            @ResponseCode (code = HttpURLConnection.HTTP_OK, condition = "Operation successful"),
            @ResponseCode(code = HttpURLConnection.HTTP_UNAVAILABLE, condition = "No providers available") })
    public Response updateSecurityRule(
            @PathParam ("securityRuleUUID") String securityRuleUUID, final NeutronSecurityRuleRequest input) {
        return update(securityRuleUUID, input);
    }

    /**
     * Deletes a Security Rule
     */

    @Path ("{securityRuleUUID}")
    @DELETE
    @StatusCodes ({
            @ResponseCode (code = HttpURLConnection.HTTP_NO_CONTENT, condition = "No Content"),
            @ResponseCode(code = HttpURLConnection.HTTP_UNAVAILABLE, condition = "No providers available") })
    public Response deleteSecurityRule(
            @PathParam ("securityRuleUUID") String securityRuleUUID) {
        return delete(securityRuleUUID);
    }
}