/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.onlab.onos.net.flow.instructions;

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

import java.util.Objects;

import org.onlab.packet.IpPrefix;

/**
 * Abstraction of a single traffic treatment step.
 */
public abstract class L3ModificationInstruction implements Instruction {

    /**
     * Represents the type of traffic treatment.
     */
    public enum L3SubType {
        /**
         * Ether src modification.
         */
        IP_SRC,

        /**
         * Ether dst modification.
         */
        IP_DST

        //TODO: remaining types
    }

    /**
     * Returns the subtype of the modification instruction.
     * @return type of instruction
     */
    public abstract L3SubType subtype();

    @Override
    public Type type() {
        return Type.L3MODIFICATION;
    }

    /**
     * Represents a L3 src/dst modification instruction.
     */
    public static final class ModIPInstruction extends L3ModificationInstruction {

        private final L3SubType subtype;
        private final IpPrefix ip;

        public ModIPInstruction(L3SubType subType, IpPrefix addr) {

            this.subtype = subType;
            this.ip = addr;
        }

        @Override
        public L3SubType subtype() {
            return this.subtype;
        }

        public IpPrefix ip() {
            return this.ip;
        }

        @Override
        public String toString() {
            return toStringHelper(subtype().toString())
                    .add("ip", ip).toString();
        }

        @Override
        public int hashCode() {
            return Objects.hash(ip, type(), subtype());
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }
            if (obj instanceof ModIPInstruction) {
                ModIPInstruction that = (ModIPInstruction) obj;
                return  Objects.equals(ip, that.ip) &&
                        Objects.equals(this.type(), that.type()) &&
                        Objects.equals(this.subtype(), that.subtype());

            }
            return false;
        }

    }
}