/*
  Copyright 2020 Whitestack LLC

  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.
*/

module common-augments {
    yang-version 1.1;
    namespace "urn:etsi:osm:yang:augments";
    prefix "common";

    import etsi-nfv-vnfd {
        prefix vnfd;
    }
    import etsi-nfv-nsd {
        prefix nsd;
    }

    typedef parameter-data-type {
        type enumeration {
            enum STRING;
            enum INTEGER;
            enum BOOLEAN;
        }
    }

    grouping primitive-parameter-value {
        list parameter {
            description
              "List of parameters to the configuration primitive.";
            key "name";
            leaf name {
                description
                  "Name of the parameter.";
                type string;
            }

            leaf data-type {
                description
                  "Data type associated with the value.";
                type common:parameter-data-type;
            }

            leaf value {
                description
                  "Value associated with the name.";
                type string;
            }
        }
    }

    grouping primitive-parameter {
        leaf name {
            description
              "Name of the parameter.";
            type string;
        }

        leaf data-type {
            description
              "Data type associated with the name.";
            type common:parameter-data-type;
        }

        leaf mandatory {
            description
              "Is this field mandatory";
            type boolean;
            default false;
        }

        leaf default-value {
            description
              "The default value for this field";
            type string;
        }

        leaf parameter-pool {
            description
              "NSD parameter pool name to use for this parameter";
            type string;
        }

        leaf read-only {
            description
              "The value should be dimmed by the UI.
               Only applies to parameters with default values.";
            type boolean;
            default false;
        }

        leaf hidden {
            description
              "The value should be hidden by the UI.
               Only applies to parameters with default values.";
            type boolean;
            default false;
        }
    }

    grouping relations-ee {
        description
          "Information about the execution environment and endpoint for a relation.
           The execution environment can be associated to different objects: kdu, vdu, vnf, or ns.
           To select the object, the profile-id of the object might be needed:
            Reference to a kdu-level execution enviroment:
                in the VNFd: the kdu-resource-profile-id is needed.
                in the NSd: the kdu-resource-profile-id and vnf-profile-id are needed.
            Reference to a vdu-level execution enviroment:
                in the VNFd: the vdu-profile-id is needed.
                in the NSd: the vdu-profile-id and vnf-profile-id are needed.
            Reference to a vnf-level execution enviroment:
                in the VNFd: nothing is needed, implicit.
                in the NSd: the vnf-profile-id is needed.
            Reference to an ns-level execution enviroment:
                in the VNFd: cannot be done.
                in the NSd: nothing is needed, implicit.
           The reference to the execution environment is only mandatory if there is more than one execution environment
           in the execution-environment-list of an object.
           The endpoint is always needed";

        leaf vdu-profile-id {
            description
              "If the execution environment is associated to a vdu object,
              this parameter is the reference to the vdu-profile id.";
            type leafref {
                path "/vnfd:vnfd/vnfd:df/vnfd:vdu-profile/vnfd:id";
            }
        }

        leaf kdu-resource-profile-id {
            description
              "If the execution environment is associated to a kdu resource object,
              this parameter is the reference to the kdu-resource-profile id.";
            type string;
        }

        leaf vnf-profile-id {
            description
              "If the execution environment is associated to a vnf object,
              this parameter is the reference to the vnf-profile id.
              Only valid in the NSd. The value is implicit in a VNFd.
              To reference an execution environment associated to a vnf object
              from the VNFd, none of the profile ids need to be specified.";
            type leafref {
                path "/nsd:nsd/nsd:nsd/nsd:df/nsd:vnf-profile/nsd:id";
            }
        }
        leaf execution-environment-ref {
            description
              "Optional reference to the execution environment id.
              Only needed if there is more than one execution environment
              in the execution-environment-list of an object.";
            type string;
            default "";
        }
        leaf endpoint {
            description
              "Endpoint name of the execution environment.";
            type string;
        }
    }

    grouping relations {
        list relation {
            description
              "List of relations between elements in this descriptor.
               The relations are used to integrate pairs of execution environments,
               that are in charge of the configuration and lifecycle management
               of VDUs, VNFs, KDUs, or NSs.
               Each relation is formed by a provider and a requirer.
                  The provider is the execution environment that provides a particular service.
                  The requirer is the execution environment that requires the service provided by the provider";
            key "name";

            leaf name {
                description
                  "Name of the relation.";

                type string;
            }
            container provider {
                description
                  "Execution environment that offers an endpoint for a particular service";
                uses relations-ee;
            }
            container requirer {
                description
                  "Execution environment that uses the service provided by the provider";
                uses relations-ee;
            }
            list entities {
                description
                  "DEPRECATION NOTICE: use provider and requirer instead.
                   List of two elements to be related.
                   Elements to be related are identified by a pair (id, endpoint).
                   The relation will relate (id1, endpoint1) to (id2, endpoint2).";
                key "id";

                leaf id {
                    description
                      "A string, reference to the element id in the descriptor.
                       It could be a vnfd-id or a vdu-id in a VNFD,
                       or a nsd-id or member-vnf-index in a NSD.";
                    type string;
                }

                leaf endpoint {
                    description
                      "Endpoint name defining the relation.";
                    type string;
                }
            }
            must 'not(entities) or (not(provider) and not(requirer))' {
                error-message 'Cannot set both "entities" and "provider/requirer" fields.';
            }
        }
    }

    grouping vnfc-metrics {
        description
          "Information about the VNF or VDU metrics";
        list metrics {
            description
              "List of VNFC related metrics";
            key "name";
            leaf name {
                description
                  "Name of the metric, as defined in the Juju charm.";
                type string;
            }
        }
    }

    grouping configuration-method {
        choice config-method {
            description
              "Defines the configuration method for the VNF or VDU.";
            case script {
                description
                  "Use custom script for configuring the VNF or VDU.
                   This script is executed in the context of
                   Orchestrator (The same system and environment
                   as the Launchpad).";
                container script {
                    leaf script-type {
                        description
                          "Script type - currently supported - Scripts confirming to Rift CA plugin";
                        type enumeration {
                            enum rift;
                        }
                    }
                }
            }

            case juju {
                description
                  "Configure the VNF or VDU through Juju.";
                container juju {
                    leaf charm {
                        description
                          "Juju charm to use with the VNF or VDU.";
                        type string;
                    }
                    leaf proxy {
                        description
                          "Is this a proxy charm?";
                        type boolean;
                        default true;
                    }
                    leaf cloud {
                        description
                          "Type of cloud where the charm will be deployed. It only
                           applies to proxy charms (not native)";
                        type enumeration {
                          enum lxd;
                          enum k8s;
                        }
                        default lxd;
                    }
                }
            }

            case execution-environment-list {
                description
                  "List of Execution Environments to configure or monitor VNF or VDU.";
                list execution-environment-list {
                    key "id";
                    leaf id {
                      description "Execution environment identifier.";
                    type string;
                    }
                    choice execution-environment-model {
                        description
                          "Execution environment model (juju, helm-chart)";
                        case juju {
                            description
                              "Interact with the VNF or xDU through Juju.";
                            container juju {
                                leaf charm {
                                  description
                                    "Juju charm to use with the VNF or VDU.";
                                  type string;
                                }
                                leaf proxy {
                                  description
                                    "Is this a proxy charm?";
                                  type boolean;
                                  default true;
                                }
                                leaf cloud {
                                  description
                                    "Type of cloud where the charm will be deployed. It only
                                     applies to proxy charms (not native)";
                                  type enumeration {
                                    enum lxd;
                                    enum k8s;
                                  }
                                  default lxd;
                                }
                            }
                        }
                        case helm-chart {
                            description
                              "Interact with the VNF or xDU through Helm.";
                            leaf helm-chart {
                                description
                                  "Helm chart that models the execution environment, in any of the following ways:
                                   - <helm-repo>/<helm-chart>
                                   - <helm-chart folder name under helm-charts folder in the package>
                                   - <helm-chart tgz file (w/ or w/o extension) under helm-charts folder in the package>
                                   - <URL_where_to_fetch_chart>
                                  ";
                                type string;
                            }
                            leaf helm-version {
                                description
                                  "Helm version to use for this helm-chart, v3 by default";
                                type enumeration {
                                  enum "v3";
                                }
                                default "v3";
                            }
                        }
                    }
                    leaf metric-service {
                        description
                          "Service name in the execution environment. For helm charts, it will be
                           the name of the kubernetes service used by the exporter to expose metrics
                           to the OSM collector.
                          ";
                        type string;
                    }
                    leaf external-connection-point-ref {
                        description
                          "String representing a leaf reference to the particular external connection point
                           This field should match /vnfd:vnfd-catalog/vnfd:vnfd/vnfd:id/vnfd:connection-point/vnfd:name
                          ";
                        type string;
                    }
                }
            }
        }
    }

    grouping vdu-config-access {

        container config-access {

            description
              "Indicates the way to access to the xNF or xDU for VCA configuration.
               For the moment there is a single way (ssh-access).";

            container ssh-access {

                description
                  "If the xNF requires ssh and this parameter is set, SSH keys
                   will be injected so that VCA can configure the xNF or xDU via ssh.";

                leaf required {
                    description
                      "whether ssh access is needed or not";
                    type boolean;
                    default false;
                }

                leaf default-user {
                    description
                      "Default user for ssh";
                    type string;
                }
            }
        }
    }
    
    grouping vnfc-configuration {
        description
          "Common information in the descriptors for NS, VNF or VDU configuration.
           Note: If the NS contains multiple instances of the
           same VNF or VDU, each instance could have a different
           configuration.";

        uses common:configuration-method;

        list config-primitive {
            description
              "List of config primitives supported by the
               configuration agent for this VNF or VDU.";
            key "name";

            leaf name {
                description
                  "Name of the config primitive.";
                type string;
            }

            leaf execution-environment-ref {
                description
                  "Leaf reference to the particular execution environment";
                type leafref {
                  path "../../execution-environment-list/id";
                }
            }

            leaf execution-environment-primitive {
                description
                  "Name of the primitive in the execution enviroment. If not explicit,
                   the leaf 'name' will be used as the name of the primitive.";
                type string;
            }


            list parameter {
                description
                  "List of parameters to the config primitive.";
                key "name";
                uses primitive-parameter;
            }

            leaf user-defined-script {
                description
                  "A user defined script. If user defined script is defined,
                   the script will be executed using bash";
                type string;
            }
        }

        list initial-config-primitive {
            description
              "Initial set of configuration primitives.";
            key "seq";
            leaf seq {
                description
                  "Sequence number for the configuration primitive.";
                type uint64;
            }

            choice primitive-type {
                case primitive-definition {
                    leaf name {
                        description
                          "Name of the configuration primitive.";
                        type string;
                    }

                    leaf execution-environment-ref {
                        description
                          "Leaf reference to the particular execution environment";
                        type leafref {
                          path "../../execution-environment-list/id";
                        }
                    }

                    uses primitive-parameter-value;

                    leaf user-defined-script {
                        description
                          "A user defined script.";
                        type string;
                    }
                }
            }
        }

        list terminate-config-primitive {
            description
              "Terminate set of configuration primitives.";
            key "seq";
            leaf seq {
                description
                  "Sequence number for the configuration primitive.";
                type uint64;
            }
            leaf name {
                description
                  "Name of the configuration primitive.";
                type string;
            }

            leaf execution-environment-ref {
                description
                  "Leaf reference to the particular execution environment";
                type leafref {
                  path "../../execution-environment-list/id";
                }
            }

            uses primitive-parameter-value;

            leaf user-defined-script {
                description
                  "A user defined script.";
                type string;
            }
        }
        uses common:vnfc-metrics;
    }

    typedef alarm-severity-type {
        description
          "An indication of the importance or urgency of the alarm";
        type enumeration {
            enum LOW;
            enum MODERATE;
            enum CRITICAL;
        }
    }

    typedef alarm-statistic-type {
        description
          "Statistic type to use to determine threshold crossing
           for an alarm.";
        type enumeration {
            enum AVERAGE;
            enum MINIMUM;
            enum MAXIMUM;
            enum COUNT;
            enum SUM;
        }
    }

    typedef relational-operation-type {
        description
          "The relational operator used to define whether an alarm,
           scaling event, etc. should be triggered in certain scenarios,
           such as if the metric statistic goes above or below a specified
           value.";
        type enumeration {
            enum GE; // greater than or equal
            enum LE; // less than or equal
            enum GT; // greater than
            enum LT; // less than
            enum EQ; // equal
            enum NE; // not equal
        }
    }

    grouping alarm-properties {
        leaf name {
            description
              "A human readable string to identify the alarm";
            type string;
        }

        leaf description {
            description
              "A description of this alarm";
            type string;
        }

        leaf vdur-id {
            description
              "The identifier of the VDUR that the alarm is associated with";
            type string;
        }

        container actions {
            list ok {
                key "url";
                leaf url {
                    type string;
                }
            }

            list insufficient-data {
                key "url";
                leaf url {
                    type string;
                }
            }

            list alarm {
                key "url";
                leaf url {
                    type string;
                }
            }
        }

        leaf repeat {
            description
              "This flag indicates whether the alarm should be repeatedly emitted
               while the associated threshold has been crossed.";

            type boolean;
            default true;
        }

        leaf enabled {
            description
              "This flag indicates whether the alarm has been enabled or
               disabled.";

            type boolean;
            default true;
        }

        leaf severity {
            description
              "A measure of the importance or urgency of the alarm";
            type alarm-severity-type;
        }

        leaf statistic {
            description
              "The type of metric statistic that is tracked by this alarm";
            type alarm-statistic-type;
        }

        leaf operation {
            description
              "The relational operator used to define whether an alarm should be
               triggered in certain scenarios, such as if the metric statistic
               goes above or below a specified value.";
            type relational-operation-type;
        }

        leaf value {
            description
              "This value defines the threshold that, if crossed, will trigger
               the alarm.";
            type decimal64 {
                fraction-digits 4;
            }
        }

        leaf period {
            description
              "The period defines the length of time (seconds) that the metric
               data are collected over in oreder to evaluate the chosen
               statistic.";
            type uint32;
        }

        leaf evaluations {
            description
              "Defines the length of time (seconds) in which metric data are
               collected in order to evaluate the chosen statistic.";
            type uint32;
        }
    }

    grouping virtual-interface {
        container virtual-interface {
            description
              "Container for the virtual interface properties";

            leaf type {
                description
                  "Specifies the type of virtual interface
                   between VM and host.
                   PARAVIRT        : Use the default paravirtualized interface for the VIM (virtio, vmxnet3, etc.).
                   VIRTIO          : Deprecated! Use the traditional VIRTIO interface.
                   PCI-PASSTHROUGH : Use PCI-PASSTHROUGH interface.
                   SR-IOV          : Use SR-IOV interface.
                   E1000           : Emulate E1000 interface.
                   RTL8139         : Emulate RTL8139 interface.
                   PCNET           : Emulate PCNET interface.
                   OM-MGMT         : Deprecated! Use PARAVIRT instead and set the VNF management interface at vnfd:mgmt-interface:cp";

                type enumeration {
                    enum PARAVIRT;
                    enum OM-MGMT;
                    enum PCI-PASSTHROUGH;
                    enum SR-IOV;
                    enum VIRTIO;
                    enum E1000;
                    enum RTL8139;
                    enum PCNET;
                }
                default "PARAVIRT";
            }

            leaf vpci {
                description
                  "Specifies the virtual PCI address. Expressed in
                   the following format dddd:dd:dd.d. For example
                   0000:00:12.0. This information can be used to
                   pass as metadata during the VM creation.";
                type string;
            }

            leaf bandwidth {
                description
                  "Aggregate bandwidth of the NIC.";
                type uint64;
            }
        }
    }

    grouping description {
        leaf description {
            type string;
        }
    }

    grouping vdu-storage-requirements {
        list vdu-storage-requirements {
            description
              "Array of key-value pairs that articulate the storage
               deployment requirements.

               If the storage type is persistent-storage, the following setting
               holds the persistent volume upon VM deletion:
                 key: keep-volume
                 value: true

               If storage volume can be attached to several VMs, the following setting
               will allow it:
                 key: multiattach
                 value: true";

            key "key";

            leaf key {
                type string;
            }

            leaf value {
                type string;
            }
        }
    }

    typedef scaling-trigger {
        type enumeration {
            enum pre-scale-in {
                value 1;
            }
            enum post-scale-in {
                value 2;
            }
            enum pre-scale-out {
                value 3;
            }
            enum post-scale-out {
                value 4;
            }
        }
    }

    typedef scaling-policy-type {
        type enumeration {
            enum manual {
                value 1;
            }
            enum automatic {
                value 2;
            }
        }
    }

    typedef scaling-criteria-operation {
        type enumeration {
            enum AND {
                value 1;
            }
            enum OR {
                value 2;
            }
        }
    }
}