/*
 * Copyright 2019-present Open Networking Foundation
 *
 * 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.k8snode.api;

import org.onlab.packet.IpAddress;
import org.onlab.packet.IpPrefix;

import java.util.Set;

/**
 * Representation of configuration used in kubernetes API server.
 */
public interface K8sApiConfig {

    /**
     * Lists of authentication schemes.
     */
    enum Scheme {
        /**
         * Signifies that this is a HTTP authentication scheme.
         */
        HTTP,

        /**
         * Signifies that this is a HTTPS authentication scheme.
         */
        HTTPS,
    }

    /**
     * Lists of API server connectivity states.
     */
    enum State {
        /**
         * Signifies that client is connected to k8s API server.
         */
        CONNECTED,

        /**
         * Signifies that client is dis-connected from k8s API server.
         */
        DISCONNECTED,
    }

    enum Mode {
        /**
         * Signifies that the CNI is running in normal mode.
         */
        NORMAL,

        /**
         * Signifies that the CNI is running in pass-through mode.
         */
        PASSTHROUGH,
    }

    /**
     * Returns the cluster name.
     *
     * @return cluster name
     */
    String clusterName();

    /**
     * Returns cluster short name.
     *
     * @return cluster short name
     */
    String clusterShortName();

    /**
     * Returns the segmentation ID.
     *
     * @return segmentation ID
     */
    int segmentId();

    /**
     * Returns the external network CIDR.
     *
     * @return external network CIDR
     */
    IpPrefix extNetworkCidr();

    /**
     * Returns the authentication scheme.
     *
     * @return authentication scheme
     */
    Scheme scheme();

    /**
     * Returns the IP address of kubernetes API server.
     *
     * @return IP address of kubernetes API server
     */
    IpAddress ipAddress();

    /**
     * Returns the port number of kubernetes API server.
     *
     * @return port number of kubernetes API server
     */
    int port();

    /**
     * Returns the connectivity state to kubernetes API server.
     *
     * @return connectivity state to kubernetes API server
     */
    State state();

    /**
     * Returns the CNI running mode.
     *
     * @return running mode
     */
    Mode mode();

    /**
     * Returns new kubernetes API config instance with given state.
     *
     * @param newState updated state
     * @return updated kubernetes API config
     */
    K8sApiConfig updateState(State newState);

    /**
     * Returns the token used for authenticating to API server.
     *
     * @return token value
     */
    String token();

    /**
     * Returns the CA certificate data.
     *
     * @return CA certificate data
     */
    String caCertData();

    /**
     * Returns the client certificate data.
     *
     * @return client certificate data
     */
    String clientCertData();

    /**
     * Returns the client key data.
     *
     * @return client key data
     */
    String clientKeyData();

    /**
     * Returns the host Nodes info set.
     *
     * @return host nodes info set
     */
    Set<HostNodesInfo> infos();

    /**
     * Returns the distributed virtual router flag value.
     *
     * @return true if it supports DVR, false otherwise
     */
    boolean dvr();

    /**
     * Builder of new API config entity.
     */
    interface Builder {

        /**
         * Builds an immutable kubernetes API config instance.
         *
         * @return kubernetes API config instance
         */
        K8sApiConfig build();

        /**
         * Returns kubernetes API server config builder with cluster name.
         *
         * @param clusterName cluster name
         * @return kubernetes API config builder
         */
        Builder clusterName(String clusterName);

        /**
         * Returns kubernetes API server config builder with segment ID.
         *
         * @param segmentId segment ID
         * @return kubernetes API config builder
         */
        Builder segmentId(int segmentId);

        /**
         * Returns kubernetes API server config builder with external network CIDR.
         *
         * @param extNetworkCidr external network CIDR
         * @return kubernetes API config builder
         */
        Builder extNetworkCidr(IpPrefix extNetworkCidr);

        /**
         * Returns kubernetes API server config builder with supplied scheme.
         *
         * @param scheme scheme of authentication
         * @return kubernetes API config builder
         */
        Builder scheme(Scheme scheme);

        /**
         * Returns kubernetes API server config builder with supplied IP address.
         *
         * @param ipAddress IP address of kubernetes API server
         * @return kubernetes API config builder
         */
        Builder ipAddress(IpAddress ipAddress);

        /**
         * Returns kubernetes API server config builder with supplied port number.
         *
         * @param port port number of kubernetes API server
         * @return kubernetes API config builder
         */
        Builder port(int port);

        /**
         * Returns kubernetes API server config builder with supplied state.
         *
         * @param state connectivity state
         * @return kubernetes API config builder
         */
        Builder state(State state);

        /**
         * Returns kubernetes API server config builder with supplied mode.
         *
         * @param mode CNI running mode
         * @return kubernetes API config builder
         */
        Builder mode(Mode mode);

        /**
         * Returns kubernetes API server config builder with supplied token.
         *
         * @param token token for authentication
         * @return kubernetes API config builder
         */
        Builder token(String token);

        /**
         * Returns kubernetes API server config builder with supplied CA certificate data.
         *
         * @param caCertData CA certificate data
         * @return kubernetes API config builder
         */
        Builder caCertData(String caCertData);

        /**
         * Returns kubernetes API server config builder with supplied client certificate data.
         *
         * @param clientCertData client certificate data
         * @return kubernetes API config builder
         */
        Builder clientCertData(String clientCertData);

        /**
         * Returns kubernetes API server config builder with supplied client key data.
         *
         * @param clientKeyData client key data
         * @return kubernetes API config builder
         */
        Builder clientKeyData(String clientKeyData);

        /**
         * Returns kubernetes API server config builder with supplied hostNodesInfo.
         *
         * @param infos hostNodesInfo
         * @return kubernetes API config builder
         */
        Builder infos(Set<HostNodesInfo> infos);

        /**
         * Returns kubernetes API server config builder with supplied DVR flag.
         *
         * @param dvr distributed virtual router flag
         * @return kubernetes API config builder
         */
        Builder dvr(boolean dvr);
    }
}