{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://openhydro.org/schemas/v1/network_1d.schema.json",
  "title": "Benchmark1d2d 1D Network",
  "description": "Minimal 1D pipe/channel network: nodes, links, cross-sections, rating/pump curves and controls. Used as a portable input alongside or instead of native .inp files.",
  "type": "object",
  "additionalProperties": false,
  "required": ["schema_version", "nodes", "links"],
  "properties": {
    "schema_version": {
      "type": "string",
      "pattern": "^(0|[1-9]\\d*)\\.(0|[1-9]\\d*)\\.(0|[1-9]\\d*)(?:-[0-9A-Za-z-]+(?:\\.[0-9A-Za-z-]+)*)?(?:\\+[0-9A-Za-z-]+(?:\\.[0-9A-Za-z-]+)*)?$"
    },
    "units": {
      "type": "string",
      "enum": ["SI", "US"],
      "default": "SI"
    },
    "nodes": {
      "type": "array",
      "minItems": 1,
      "items": { "$ref": "#/$defs/node" }
    },
    "links": {
      "type": "array",
      "minItems": 1,
      "items": { "$ref": "#/$defs/link" }
    },
    "xsections": {
      "type": "array",
      "items": { "$ref": "#/$defs/xsection" }
    },
    "curves": {
      "type": "array",
      "items": { "$ref": "#/$defs/curve" }
    },
    "controls": {
      "type": "array",
      "items": { "$ref": "#/$defs/control" }
    }
  },
  "$defs": {
    "node": {
      "type": "object",
      "additionalProperties": false,
      "required": ["id", "kind"],
      "properties": {
        "id": { "type": "string", "minLength": 1 },
        "kind": {
          "type": "string",
          "enum": ["junction", "outfall", "storage", "divider", "reservoir"]
        },
        "x": { "type": "number" },
        "y": { "type": "number" },
        "invert_elevation": { "type": "number" },
        "max_depth": { "type": "number", "minimum": 0 },
        "initial_depth": { "type": "number", "minimum": 0 },
        "area": { "type": "number", "exclusiveMinimum": 0 },
        "attributes": {
          "type": "object",
          "additionalProperties": true
        }
      }
    },
    "link": {
      "type": "object",
      "additionalProperties": false,
      "required": ["id", "kind", "from_node", "to_node"],
      "properties": {
        "id": { "type": "string", "minLength": 1 },
        "kind": {
          "type": "string",
          "enum": ["conduit", "pipe", "pump", "orifice", "weir", "outlet"]
        },
        "from_node": { "type": "string", "minLength": 1 },
        "to_node": { "type": "string", "minLength": 1 },
        "length": { "type": "number", "exclusiveMinimum": 0 },
        "roughness": { "type": "number", "minimum": 0 },
        "xsection_id": { "type": "string" },
        "curve_id": { "type": "string" },
        "offset_upstream": { "type": "number" },
        "offset_downstream": { "type": "number" },
        "attributes": {
          "type": "object",
          "additionalProperties": true
        }
      }
    },
    "xsection": {
      "type": "object",
      "additionalProperties": false,
      "required": ["id", "shape"],
      "properties": {
        "id": { "type": "string", "minLength": 1 },
        "shape": {
          "type": "string",
          "enum": [
            "circular",
            "rectangular",
            "trapezoidal",
            "triangular",
            "irregular",
            "custom"
          ]
        },
        "geom1": { "type": "number" },
        "geom2": { "type": "number" },
        "geom3": { "type": "number" },
        "geom4": { "type": "number" },
        "stations": {
          "type": "array",
          "description": "Irregular cross-section station-elevation pairs.",
          "items": {
            "type": "object",
            "additionalProperties": false,
            "required": ["station", "elevation"],
            "properties": {
              "station": { "type": "number" },
              "elevation": { "type": "number" }
            }
          }
        }
      }
    },
    "curve": {
      "type": "object",
      "additionalProperties": false,
      "required": ["id", "kind", "points"],
      "properties": {
        "id": { "type": "string", "minLength": 1 },
        "kind": {
          "type": "string",
          "enum": ["pump", "rating", "storage", "shape", "tidal", "control"]
        },
        "points": {
          "type": "array",
          "minItems": 2,
          "items": {
            "type": "object",
            "additionalProperties": false,
            "required": ["x", "y"],
            "properties": {
              "x": { "type": "number" },
              "y": { "type": "number" }
            }
          }
        }
      }
    },
    "control": {
      "type": "object",
      "additionalProperties": false,
      "required": ["id", "rule"],
      "properties": {
        "id": { "type": "string", "minLength": 1 },
        "rule": {
          "type": "string",
          "minLength": 1,
          "description": "Human-readable or SWMM-style control rule text."
        },
        "priority": { "type": "integer" },
        "attributes": {
          "type": "object",
          "additionalProperties": true
        }
      }
    }
  }
}