/*
 * Copyright 2017-present 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.openstacknetworking.api;

import org.joda.time.LocalDateTime;
import org.onosproject.event.AbstractEvent;
import org.openstack4j.model.network.Network;
import org.openstack4j.model.network.Port;
import org.openstack4j.model.network.Subnet;

import java.util.Collection;

import static com.google.common.base.MoreObjects.toStringHelper;

/**
 * Describes OpenStack network service event.
 */
public class OpenstackNetworkEvent extends AbstractEvent<OpenstackNetworkEvent.Type, Network> {

    private final Port port;
    private final Subnet subnet;
    private final Collection<String> sgRuleIds;

    public enum Type {
        /**
         * Signifies that a new OpenStack network is created.
         */
        OPENSTACK_NETWORK_CREATED,

        /**
         * Signifies that the OpenStack network is updated.
         */
        OPENSTACK_NETWORK_UPDATED,

        /**
         * Signifies that the OpenStack network is removed.
         */
        OPENSTACK_NETWORK_REMOVED,

        /**
         * Signifies that a new OpenStack subnet is created.
         */
        OPENSTACK_SUBNET_CREATED,

        /**
         * Signifies that the OpenStack subnet is updated.
         */
        OPENSTACK_SUBNET_UPDATED,

        /**
         * Signifies that the OpenStack subnet is removed.
         */
        OPENSTACK_SUBNET_REMOVED,

        /**
         * Signifies that a new OpenStack port is created.
         */
        OPENSTACK_PORT_CREATED,

        /**
         * Signifies that the OpenStack port is updated.
         */
        OPENSTACK_PORT_UPDATED,

        /**
         * Signifies that the OpenStack port is removed.
         */
        OPENSTACK_PORT_REMOVED,

        /**
         * Signifies that the OpenStack security group rule is added to a specific port.
         */
        OPENSTACK_SECURITY_GROUP_ADDED_TO_PORT,

        /**
         * Signifies that the OpenStack security group rule is removed from a specific port.
         */
        OPENSTACK_SECURITY_GROUP_REMOVED_FROM_PORT
    }

    /**
     * Creates an event of a given type for the specified network and the current time.
     * @param type    openstack network event type
     * @param network openstack network
     */
    public OpenstackNetworkEvent(Type type, Network network) {
        super(type, network);
        this.port = null;
        this.subnet = null;
        this.sgRuleIds = null;
    }

    /**
     * Creates an event of a given type for the specified network, port and the
     * current time.
     *
     * @param type    openstack network event type
     * @param network openstack network
     * @param port    openstack port
     */
    public OpenstackNetworkEvent(Type type, Network network, Port port) {
        super(type, network);
        this.port = port;
        this.subnet = null;
        this.sgRuleIds = null;
    }

    /**
     * Creates an event of a given type for the specified network, subnet and the
     * current time.
     *
     * @param type    openstack network event type
     * @param network openstack network
     * @param subnet  openstack subnet
     */
    public OpenstackNetworkEvent(Type type, Network network, Subnet subnet) {
        super(type, network);
        this.port = null;
        this.subnet = subnet;
        this.sgRuleIds = null;
    }

    /**
     * Creates an event of a given type for the specified port and security groups.
     *
     * @param type openstack network event type
     * @param sgRuleIds openstack security group rules
     * @param port openstack port
     */
    public OpenstackNetworkEvent(Type type, Collection<String> sgRuleIds, Port port) {
        super(type, null);
        this.port = port;
        this.sgRuleIds = sgRuleIds;
        this.subnet = null;
    }

    /**
     * Returns the port of the network event.
     *
     * @return openstack port; null if the event is not port specific
     */
    public Port port() {
        return port;
    }

    /**
     * Returns the subnet of the network event.
     *
     * @return openstack subnet; null if the event is not subnet specific
     */
    public Subnet subnet() {
        return subnet;
    }

    /**
     * Returns the security group rule IDs updated.
     *
     * @return collection of security group rule ID
     */
    public Collection<String> securityGroupRuleIds() {
        return sgRuleIds;
    }

    @Override
    public String toString() {
        if (port == null && subnet == null) {
            return super.toString();
        }
        return toStringHelper(this)
                .add("time", new LocalDateTime(time()))
                .add("type", type())
                .add("network", subject())
                .add("port", port)
                .add("subnet", subnet)
                .add("security group rules", securityGroupRuleIds())
                .toString();
    }
}