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/*
 * Copyright 2015 Open Networking Laboratory
 *
 * 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.net.config.basics;

import org.onosproject.core.ApplicationId;
import org.onosproject.core.CoreService;
import org.onosproject.net.ConnectPoint;
import org.onosproject.net.DeviceId;
import org.onosproject.net.HostId;
import org.onosproject.net.LinkKey;
import org.onosproject.net.config.SubjectFactory;

import static com.google.common.base.Preconditions.checkArgument;

/**
 * Set of subject factories for potential configuration subjects.
 */
public final class SubjectFactories {

    // Construction forbidden
    private SubjectFactories() {
    }

    // Required for resolving application identifiers
    private static CoreService coreService;

    public static final SubjectFactory APP_SUBJECT_FACTORY =
            new SubjectFactory(ApplicationId.class, "apps") {
                @Override
                public ApplicationId createSubject(String key) {
                    return coreService.registerApplication(key);
                }
            };

    public static final SubjectFactory DEVICE_SUBJECT_FACTORY =
            new SubjectFactory(DeviceId.class, "devices") {
                @Override
                public DeviceId createSubject(String key) {
                    return DeviceId.deviceId(key);
                }
            };

    public static final SubjectFactory CONNECT_POINT_SUBJECT_FACTORY =
            new SubjectFactory(ConnectPoint.class, "ports") {
                @Override
                public ConnectPoint createSubject(String key) {
                    return ConnectPoint.deviceConnectPoint(key);
                }
            };

    public static final SubjectFactory HOST_SUBJECT_FACTORY =
            new SubjectFactory(HostId.class, "hosts") {
                @Override
                public HostId createSubject(String key) {
                    return HostId.hostId(key);
                }
            };

    public static final SubjectFactory LINK_SUBJECT_FACTORY =
            new SubjectFactory(LinkKey.class, "links") {
                @Override
                public LinkKey createSubject(String key) {
                    String[] cps = key.split("-");
                    checkArgument(cps.length == 2, "Incorrect link key format: %s", key);
                    return LinkKey.linkKey(ConnectPoint.deviceConnectPoint(cps[0]),
                                           ConnectPoint.deviceConnectPoint(cps[1]));
                }
            };

    /**
     * Provides reference to the core service, which is required for
     * application subject factory.
     *
     * @param service core service reference
     */
    public static void setCoreService(CoreService service) {
        coreService = service;
    }

}