/*
 * Copyright 2017-present Open Networking Foundation
 *
 * 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 org.onosproject.openstacknetworking.cli;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.google.common.collect.Lists;
import org.apache.karaf.shell.api.action.Command;
import org.apache.karaf.shell.api.action.lifecycle.Service;
import org.onosproject.cli.AbstractShellCommand;
import org.onosproject.openstacknetworking.api.OpenstackNetworkService;
import org.onosproject.openstacknetworking.api.OpenstackRouterService;
import org.openstack4j.model.network.IP;
import org.openstack4j.model.network.Port;
import org.openstack4j.model.network.Router;
import org.openstack4j.model.network.RouterInterface;
import org.openstack4j.openstack.networking.domain.NeutronRouter;

import java.util.Comparator;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

import static org.onosproject.openstacknetworking.util.OpenstackNetworkingUtil.deriveResourceName;
import static org.onosproject.openstacknetworking.util.OpenstackNetworkingUtil.modelEntityToJson;
import static org.onosproject.openstacknetworking.util.OpenstackNetworkingUtil.prettyJson;

/**
 * Lists OpenStack routers.
 */
@Service
@Command(scope = "onos", name = "openstack-routers",
        description = "Lists all OpenStack routers")
public class OpenstackRouterListCommand extends AbstractShellCommand {

    private static final String FORMAT = "%-40s%-20s%-20s%-8s";

    private final OpenstackRouterService routerService =
            AbstractShellCommand.get(OpenstackRouterService.class);
    private final OpenstackNetworkService netService =
            AbstractShellCommand.get(OpenstackNetworkService.class);

    @Override
    protected void doExecute() {
        List<Router> routers = Lists.newArrayList(routerService.routers());
        routers.sort(Comparator.comparing(Router::getId));

        if (outputJson()) {
            print("%s", json(routers));
        } else {
            print(FORMAT, "ID", "Name", "External", "Internal");
            for (Router router: routers) {
                String exNetId = router.getExternalGatewayInfo() != null ?
                        router.getExternalGatewayInfo().getNetworkId() : null;

                List<String> externals = Lists.newArrayList();
                if (exNetId != null) {
                    // FIXME fix openstack4j to provide external gateway ip info
                    externals = netService.ports(exNetId).stream()
                            .filter(port -> Objects.equals(port.getDeviceId(),
                                    router.getId()))
                            .flatMap(port -> port.getFixedIps().stream())
                            .map(IP::getIpAddress)
                            .collect(Collectors.toList());
                }

                List<String> internals = Lists.newArrayList();
                routerService.routerInterfaces(router.getId()).forEach(iface -> {
                    internals.add(getRouterIfaceIp(iface));
                });
                print(FORMAT, router.getId(), deriveResourceName(router), externals, internals);
            }
        }
    }

    private String getRouterIfaceIp(RouterInterface iface) {
        Port osPort = netService.port(iface.getPortId());
        IP ipAddr = osPort.getFixedIps().stream()
                .filter(ip -> ip.getSubnetId().equals(iface.getSubnetId()))
                .findAny().orElse(null);
        return ipAddr == null ? "" : ipAddr.getIpAddress();
    }

    private String json(List<Router> routers) {
        ObjectMapper mapper = new ObjectMapper();
        ArrayNode result = mapper.createArrayNode();
        for (Router router: routers) {
            result.add(modelEntityToJson(router, NeutronRouter.class));
        }
        return prettyJson(mapper, result.toString());
    }
}