/*
 * Copyright 2016 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.openstackinterface;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import org.onlab.packet.Ip4Address;
import java.util.Map;
import java.util.Objects;

/**
 * A configurable external gateway modes extension model in openstack router.
 */
public final class OpenstackExternalGateway {

    private final String networkId;
    private final boolean enablePnat;
    private final Map<String, Ip4Address> externalFixedIps;

    private OpenstackExternalGateway(String networkId, boolean enablePnat,
                                     Map<String, Ip4Address> externalFixedIps) {
        this.networkId = networkId;
        this.enablePnat = enablePnat;
        this.externalFixedIps = externalFixedIps;
    }

    /**
     * Returns network ID.
     *
     * @return Network ID
     */
    public String networkId() {
        return networkId;
    }

    /**
     * Returns the PNAT status for external gateway.
     *
     * @return PNAT status
     */
    public boolean isEnablePnat() {
        return enablePnat;
    }

    /**
     * Returns external fixed IP informations.
     *
     * @return External fixed IP informations
     */
    public Map<String, Ip4Address> externalFixedIps() {
        return ImmutableMap.copyOf(externalFixedIps);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }

        if (o instanceof OpenstackExternalGateway) {
            OpenstackExternalGateway that = (OpenstackExternalGateway) o;

            return this.networkId.equals(that.networkId) &&
                    this.enablePnat == that.enablePnat &&
                    this.externalFixedIps.equals(that.externalFixedIps);
        }

        return false;
    }

    @Override
    public int hashCode() {
        return Objects.hash(networkId, enablePnat, externalFixedIps);
    }

    /**
     * An Openstack External Gateway Builder class.
     */
    public static final class Builder {
        private String networkId;
        private boolean enablePnat;
        private Map<String, Ip4Address> externalFixedIps;

        public Builder() {
            externalFixedIps = Maps.newHashMap();
        }

        /**
         * Sets network ID.
         *
         * @param networkId Network ID
         * @return Builder object
         */
        public Builder networkId(String networkId) {
            this.networkId = networkId;
            return this;
        }

        /**
         * Sets whether PNAT status is enabled or not.
         *
         * @param enablePnat true if PNAT status is enabled, false otherwise
         * @return Builder object
         */
        public Builder enablePnat(boolean enablePnat) {
            this.enablePnat = enablePnat;
            return this;
        }

        /**
         * Sets external fixed IP address information.
         *
         * @param externalFixedIps External fixed IP information
         * @return Builder object
         */

        public Builder externalFixedIps(Map<String, Ip4Address> externalFixedIps) {
            this.externalFixedIps.putAll(externalFixedIps);
            return this;
        }

        /**
         * Builds an OpenstackExternalGateway object.
         *
         * @return OpenstackExternalGateway object
         */
        public OpenstackExternalGateway build() {
            return new OpenstackExternalGateway(networkId, enablePnat, ImmutableMap.copyOf(externalFixedIps));
        }
    }

}