/*
 * Copyright 2015-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.dhcp;

import org.onlab.packet.Ip4Address;
import org.onlab.packet.MacAddress;
import org.onosproject.net.HostId;

import java.util.List;
import java.util.Map;


/**
 * DHCP Service Interface.
 */
public interface DhcpService {

    /**
     * Returns a collection of all the MacAddress to IPAddress mapping.
     *
     * @return collection of mappings.
     */
    Map<HostId, IpAssignment> listMapping();

    /**
     * Returns the default lease time granted by the DHCP Server.
     *
     * @return lease time
     */
    int getLeaseTime();

    /**
     * Returns the default renewal time granted by the DHCP Server.
     *
     * @return renewal time
     */
    int getRenewalTime();

    /**
     * Returns the default rebinding time granted by the DHCP Server.
     *
     * @return rebinding time
     */
    int getRebindingTime();

    /**
     * Registers a static IP mapping with the DHCP Server.
     * Supports rangeNotEnforced option
     *
     * @param macID macID of the client
     * @param ipAddress IP Address requested for the client
     * @param rangeNotEnforced true if rangeNotEnforced was set and the mapping will be eternal
     * @param addressList subnetMask, DHCP/Router/DNS IP Addresses if rangeNotEnforced was set
     * @return true if the mapping was successfully added, false otherwise
     */
    boolean setStaticMapping(MacAddress macID, Ip4Address ipAddress, boolean rangeNotEnforced,
                             List<Ip4Address> addressList);

    /**
     * Removes a static IP mapping with the DHCP Server.
     *
     * @param macID macID of the client
     * @return true if the mapping was successfully removed, false otherwise
     */
    boolean removeStaticMapping(MacAddress macID);

    /**
     * Returns the list of all the available IPs with the server.
     *
     * @return list of available IPs
     */
    Iterable<Ip4Address> getAvailableIPs();
}