module gnpy-network-topology {
  yang-version 1.1;
  namespace "gnpy:gnpy-network-topology";
  prefix gnpynt;

  organization
    "Telecom Infra Project OOPT PSE Working Group";
  contact
    "WG Web:   <https://github.com/Telecominfraproject/oopt-gnpy>
     contact:  <mailto:ahmed.triki@orange.com>
     contact:  <mailto:esther.lerouzic@orange.com>
    ";
  description
    "YANG model for gnpy network input for path computation - 2020 - candi preversion";

  revision 2020-10-22 {
    description
      "draft for experimental/2020-candi";
    reference
      "YANG model for network input for path computation with gnpy";
  }

  identity type-element {
    description
      "Base identity for element type";
  }

  identity Transceiver {
    base type-element;
    description
      " Transceiver element";
  }

  identity Fiber {
    base type-element;
    description
      "Fiber element (unidirectional)";
  }

  identity Roadm {
    base type-element;
    description
      "Roadm element";
  }

  identity Edfa {
    base type-element;
    description
      "Edfa element";
  }

  identity Fused {
    base type-element;
    description
      "Fused element ; non amplified connection between two fiber spans ;
       can be used to model optical distribution frame, or losses due to
       connectors or fused in a span";
  }

  identity length-unit {
    description
      "length unit";
  }

  identity km {
    base length-unit;
    description
      "kilometers";
  }

  identity m {
    base length-unit;
    description
      "meter";
  }

  typedef Coordinate {
    type decimal64 {
      fraction-digits 6;
    }
  }

  typedef Coef {
    type decimal64 {
      fraction-digits 2;
    }
  }

  grouping location-attributes {
    container location {
      leaf city {
        type string;
        mandatory true;
      }
      leaf region {
        type string;
        mandatory true;
      }
      leaf latitude {
        type Coordinate;
        mandatory true;
      }
      leaf longitude {
        type Coordinate;
        mandatory true;
      }
    }
  }

  grouping fiber-params {
    description
      ".....";
    leaf length {
      type decimal64 {
        fraction-digits 2;
      }
      mandatory true;
    }
    leaf loss_coef {
      type decimal64 {
        fraction-digits 2;
      }
      mandatory true;
      units db/km;
      description "Loss coefficient of the fiber span (dB/km)";
    }
    leaf length_units {
      type identityref {
        base length-unit;
      }
      mandatory true;
    }
    leaf att_in {
      type decimal64 {
        fraction-digits 2;
      }
      units "dB";
      mandatory true;
    }
    leaf con_in {
      type decimal64 {
        fraction-digits 2;
      }
      units "dB";
      mandatory true;
    }
    leaf con_out {
      type decimal64 {
        fraction-digits 2;
      }
      units "dB";
      mandatory true;
    }
  }

  grouping edfa-params {
    container operational {
      description
        "Operational values for the Edfa ";
      leaf gain_target {
        type decimal64 {
          fraction-digits 2;
        }
        units "dB";
        mandatory true;
        description
          "gain target of the amplifier (before VOA and after att_in)";
      }
      leaf tilt_target {
        type decimal64 {
          fraction-digits 2;
        }
        mandatory true;
        description
          "..";
      }
      leaf out_voa {
        type decimal64 {
          fraction-digits 2;
        }
        units "dB";
        mandatory true;
        description
          "..";
      }
      leaf delta_p {
        type decimal64 {
          fraction-digits 2;
        }
        units "dB";
        mandatory true;
        description
          "per channel target output power delta with respect to power setting in SI";
      }
    }
  }

  grouping roadm-params {
    leaf target_pch_out_db {
      type decimal64 {
        fraction-digits 2;
      }
      units "dB";
      description
        "..";
    }
    container restrictions {
      leaf-list preamp_variety_list {
        type string;
        description 
          "List of authorized preamp type-variety";
      }
      leaf-list booster_variety_list {
        type string;
        description 
          "List of authorized booster type-variety";
      }
    }
  }

  grouping transceiver-params;

  grouping fused-params{
    leaf loss {
      type decimal64 {
        fraction-digits 2;
      }
      units "dB";
      description
        "Concentrated loss of the fused element";    
    }
  }

  grouping element-type-choice {
    choice element-type {
      case Edfa {
        when "type = 'Edfa'";
        uses edfa-params;
      }
      case FiberRoadm {
        container params {
          choice fiberroadmfused {
            case Fiber {
              when "type = 'Fiber'";
              uses fiber-params;
            }
            case Roadm {
              when "type = 'Roadm'";
              uses roadm-params;
            }
            case Fused {
              when "type = 'Fused'";
              uses fused-params;
            }
          }
        }
      }
      case Transceiver {
        when "type = 'Transceiver'";
      }
    }
  }


  grouping topo {
    list elements {
      key "uid";
      leaf uid {
        type string;
      }
      leaf type {
        type identityref {
          base type-element;
        }
        mandatory true;
      }
      leaf type_variety {
        type string;
        mandatory false;
      }
      container metadata {
        uses location-attributes;
      }
      uses element-type-choice;
    }
    list connections {
      config false;
      leaf from_node {
        type leafref {
          path "../../elements/uid";
        }
      }
      leaf to_node {
        type leafref {
          path "../../elements/uid";
        }
      }
    }
  }
}