/*
 * 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.drivers.p4runtime;

import org.onosproject.net.DefaultAnnotations;
import org.onosproject.net.LinkKey;
import org.onosproject.net.behaviour.LinkDiscovery;
import org.onosproject.net.config.NetworkConfigService;
import org.onosproject.net.config.basics.BasicLinkConfig;
import org.onosproject.net.driver.AbstractHandlerBehaviour;
import org.onosproject.net.link.DefaultLinkDescription;
import org.onosproject.net.link.LinkDescription;

import java.util.Set;
import java.util.stream.Collectors;

/**
 * Implementation of the LinkDiscovery behaviour that returns all link available in the network configuration
 * subsystem, where this device is the source connect point.
 */
// TODO: remove this behavior as soon we get working Packet I/O on Tofino.
public class NetcfgLinkDiscovery extends AbstractHandlerBehaviour implements LinkDiscovery {

    @Override
    public Set<LinkDescription> getLinks() {
        final NetworkConfigService configService = this.handler().get(NetworkConfigService.class);
        return configService.getSubjects(LinkKey.class)
                .stream()
                .filter(linkKey -> linkKey.src().deviceId().equals(data().deviceId()))
                .map(linkKey -> {
                    BasicLinkConfig linkConfig = configService.getConfig(linkKey, BasicLinkConfig.class);
                    return new DefaultLinkDescription(linkKey.src(), linkKey.dst(),
                                                      linkConfig.type(),
                                                      DefaultLinkDescription.EXPECTED,
                                                      DefaultAnnotations.EMPTY);
                })
                .collect(Collectors.toSet());
    }
}